JPH05328760A - Vibration motor - Google Patents

Abstract

PURPOSE:To provide a vibration motor which is possible of rotating in two directions and is simple in structure and can efficiently generate rotational output. CONSTITUTION:This is a vibration motor device which has a stator part 40 and a rotor part. The stator part 40 includes ring-shaped piezoelectric elements 42 and 44, ring-shaped electrode plates 46 and 48 stacked on the surface of the piezoelectric elements, and a plate-shaped first block 50 and a plate-shaped second block 52 arranged to catch both sides of the electrode plate and the piezoelectric element. For the electrode plate 46, a plurality of voltage application areas of A phases and B phases are formed along the rotational direction of the rotor section. And, traveling waves are generated on the face 60 in contact with a rotor so as to rotate the rotor section, by applying AC voltage of A phase and B phase +90 deg. or -90 deg. different in phase to the voltage application areas of plural phases.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration motor device.

[0002]

2. Description of the Related Art Conventionally, a bolted Langevin type ultrasonic motor is well known, for example, a piezoelectric motor using a cantilever torsional ultrasonic transducer disclosed in JP-A-61-49670, An ultrasonic motor and the like according to Japanese Patent Laid-Open No. 63-217984 are known.

However, in the conventional motors of this type, there is a problem that the rotor can rotate only in one direction, and the structure is complicated and expensive.

FIG. 37 shows an example of a conventional bolted Langevin type ultrasonic motor. In this ultrasonic motor, metal block bodies 14 and 16 having different lengths are arranged at both ends of two piezoelectric elements 10 and 12, and both block bodies 14 and 16 are provided with a bolt 18 at the center thereof. It is fixed to tighten.

This ultrasonic motor has an AC power source 2
When a high-frequency AC voltage is applied to the piezoelectric elements 10 and 12 from 0, longitudinal vibration occurs due to the vibration of the piezoelectric elements 10 and 12 in the thickness direction, and torsional vibration occurs due to the twisting of the bolt 18, and the end faces of the block bodies 14 and 16 are generated. The elliptic vibration that is a combination of the longitudinal vibration and the torsional vibration is generated in the, and the rotational driving force can be obtained by the elliptic vibration.

A disk 22 is provided on the end surface of the block body 16.
Is urged toward the block body 16 by a spring 24, and the rotating shaft 26 of the disk 22 is supported by a bearing 28. Therefore, the disc 22 is attached to the block 16
By making contact with the end surface of the rotating shaft, the rotational force obtained by the combined vibration is transmitted to the disc 22 and the rotational output can be taken out from the rotating shaft 26.

[0007]

However, in the conventional ultrasonic motor, the rotational output cannot be effectively generated unless the resonance points of the longitudinal vibration and the torsional vibration are matched. For this reason, it is necessary to form one block body 14 in a short shape and form the other block body 16 in a long shape so that the resonance points coincide with each other. Therefore, the degree of freedom in designing a motor is small. was there. Further, since the ultrasonic motor including the block bodies 14 and 16 is formed in a rod-like shape in order to make the resonance points coincide with each other, the entire length becomes long, and there is a problem that flattening and downsizing are difficult. In addition, in the ultrasonic motor that generates elliptical vibration by combining longitudinal vibration and torsional vibration in this way, the block body 1
Only one direction elliptical vibration can be generated on the end face of 6
There was a problem that 6 could not be driven in both forward and reverse directions. Furthermore, in this ultrasonic motor, the oscillators 10 and 12 are
Since the elliptical vibration cannot be directly generated from the vibration of 1) and the longitudinal vibration and the torsional vibration must be combined, the generation efficiency of the elliptic vibration is not sufficient, and there is a problem that the rotational output cannot be efficiently generated correspondingly.

The present invention has been made in view of such conventional problems, and its purpose is to have a large degree of freedom in design, a simple structure and a small size, and to efficiently generate a rotational output. Moreover, it is to provide a vibration motor that can rotate in both directions as needed.

[0009]

In order to solve the above-mentioned problems, the present invention relates to a stator part, a rotor part contacting a rotor contact surface of the stator part, and a motor for applying a predetermined AC voltage to the stator part. And a piezoelectric element for generating vibration, an electrode for forming voltage application regions of a plurality of phases along a rotation direction of the rotor section on a surface of the piezoelectric element, and the piezoelectric element. A plurality of block bodies attached and fixed on both sides so as to sandwich the element,
The motor control means is formed to generate a traveling wave on the rotor contact surface of the block body by applying AC voltages of a plurality of phases having different predetermined angular phases to the voltage application regions of the plurality of phases, The rotor unit is rotationally driven.

[0010]

In the present invention, a plurality of phases of voltage application regions are formed on the surface of the piezoelectric element along the rotation direction of the rotor portion. Then, when a plurality of phases of alternating voltages having different predetermined angular phases are applied to the plurality of phases of the voltage application region, the piezoelectric element vibrates, whereby a traveling wave caused by bending vibration is generated in the stator portion (end surface of the block body). Occurs, and the rotor unit is rotationally driven.

As described above, in the vibration motor device of the present invention,
Unlike the conventional Langevin type ultrasonic motor, it is possible to directly generate a traveling wave from the vibration of the piezoelectric element without using the torsional vibration caused by the bolt. Therefore, the rotation output can be efficiently obtained. In addition, since there is no restriction on the design that the resonance points of the longitudinal vibration and the torsional vibration coincide with each other as in the conventional case, the configuration of the entire motor becomes simple and inexpensive. In particular, by using a flat block body as the block body to be used, the vibration motor as a whole can be flattened and downsized.

In addition to this, in the present invention, the direction of the traveling wave to be generated can be changed by switching the phase sequence of the AC voltages of the plurality of phases to be applied, and the rotor portion can be driven in the forward or reverse direction. ..

The present inventor has also examined the principle of rotation of this vibration motor. Vertical vibrations, torsional vibrations, and bending vibrations are known as the types of vibrations generated in this type of motor. In the conventional bolted Langevin type ultrasonic motor, the standing wave of the elliptical vibration is generated by the combination of the longitudinal vibration and the torsional vibration. It is presumed that the traveling wave is generated directly in the.

The bending vibration may be of two types: bending vibration of a rod and bending vibration due to bending of a beam. Particularly, by forming the block body in a flat shape, bending vibration due to bending of the beam is generated. The traveling wave can be generated more effectively. As described above, the vibration motor device of the present invention operates on a principle different from that of the conventional Langevin type ultrasonic motor, and as a result, it is possible to efficiently generate the rotation output, and the structure is simple and inexpensive. Therefore, the rotor unit can be bidirectionally driven as required.

FIG. 5 conceptually shows a state of bending vibration due to bending of a beam generated in the stator portion when the block body is formed in a flat shape. (A) and (B) are perspective views of the stator section in which bending vibration occurs, and (C) and (D) are the same (A),
The side view of the stator part shown to (B) is shown. As shown in the figure, in the vibration motor device of the present invention, it is possible to generate a traveling wave in the stator portion using bending vibration.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, preferred embodiments of the present invention will be described in detail with reference to the drawings.

First Embodiment FIG. 1 schematically shows a preferred first embodiment of the vibration motor device according to the present invention.

The vibration motor device of the embodiment has a rotor portion 30.
2 including a stator section 40 and a motor control circuit 80
It is formed as a phase traveling wave type. And
By applying a two-phase high-frequency AC voltage to the electrode plates 46 and 48 of the stator section 40, a traveling wave is generated in the stator section 40, and the rotor section 30 in contact with the rotor contact surface 60 of the stator section 40 is rotated normally and reversely. It is driven.

The rotor portion 30 includes a disc 32 that comes into contact with the rotor contact surface 60 at a constant pressure, and a rotation output shaft 34 attached to the center of rotation of the disc 32.

The stator portion 40 is formed of a piezoelectric material such as ceramics in a ring shape, and has two piezoelectric elements 42 and 44 which have been subjected to a predetermined polarization treatment.
A first electrode plate 46 and a second electrode plate 48 provided on both sides of the piezoelectric element 44, and a flat plate-shaped first metal block body 50 and a second metal block body 50 disposed on both sides of the piezoelectric elements 42 and 44, respectively. Metal block body 52 and both metal block bodies 5
And a coupling bolt 54 for coupling and fixing 0 and 52 so as to tighten the piezoelectric elements 42 and 44, and is formed to have a flat shape as a whole.

The motor control circuit 80 generates a traveling wave on the rotor contact surface of the block body 50 by applying a two-phase AC voltage to the first electrode plate 46 and the second electrode plate 48. .

2 and 3, the stator portion 40 is shown. Here, FIG. 2 shows an assembled state of the stator portion 40, and FIG. 3 shows an exploded perspective view thereof.

The first and second metal block bodies 50, 5
A screw hole is formed at the center of 2, and the piezoelectric element 42,
Bolt insertion holes 42a, 46a, 44a, 48a are formed at the centers of the first electrode plate 46, the piezoelectric element 44, and the second electrode plate 48.
Is provided. Then, the bolt insertion holes 42a,
A coupling bolt 54 having a collar 56 made of an insulating material inserted therein is inserted into 46a, 44a, and 48a, and screw portions provided at both ends of the coupling bolt 54 are attached to the first
And, the second metal block bodies 50 and 52 are screwed into the screw holes formed around the center. Thereby, the piezoelectric elements 42, 4
The first metal block body 50 and the second metal block body 52 are connected and fixed to both ends of the piezoelectric element so as to tighten the piezoelectric elements 42 and 44.

In this embodiment, when connecting and fixing,
Since no adhesive is used to fix the laminated surface of each member, it is possible to prevent variations in resonance frequency from one motor to another and to prevent the Q value from decreasing, thereby improving the performance and reliability of the vibration motor. You can

The first electrode plate 46 has a circumference of 12
Slits 46c are provided every 30 degrees so as to be divided, and their outer peripheral portions are connected to each other by a connecting portion 46b. The diameter of the first electrode plate 46 is the piezoelectric element 4
The diameter is formed to be slightly larger than the diameter of 2, 44, and when the stator portion 40 is assembled, its outer peripheral portion and the connecting portion 46b project to the outside of the stator. This allows
By cutting the connecting portion 46b after the assembly of the stator portion 40 is completed, the divided electrode plates 46-1, 46-2, ..., 46-12 electrically insulated from each other can be obtained. Each divided electrode plate 46-1, 46-2, ..., 4
6-12 are alternating AC voltage application regions of the A phase (46
-1, 46-3, ..., 46-11), B-phase AC voltage application region (46-2, 46-4, ..., 46-1)
It functions as 2).

The piezoelectric elements 42 and 44 are divided into 12 at intervals of 30 degrees corresponding to the divided electrode plates 46-1, 46-2, ..., 46-12. The two adjacent divided regions are formed as one set of polarization regions having the same polarization direction (A-phase and B-phase are one set), and the polarization regions of adjacent sets are opposite to each other. Is formed. Then, both piezoelectric elements 42 and 44 have the first
Polarized regions having the same sign are arranged so as to face each other through the electrode plate 46 of. Then, in the polarization regions of the piezoelectric elements 42 and 44, the divided electrode plates 46-1 of the electrode plate 46,
46-2, ..., 46-12 are arranged so that two-phase AC voltages of A phase and B phase can be applied. Figure 3
In the figure, the symbols (+, −) indicate the polarization direction of the piezoelectric element 42. As the piezoelectric elements 42 and 44, for example, those obtained by polishing and removing the surfaces of silver and nickel used as electrodes during polarization are used after the polarization is completed.

As described above, in the present embodiment, each of the divided electrode plates 46-1 to 46-12 can be handled as one electrode plate 46 at the time of assembling the stator, so that the assembling work becomes easy. Not each split electrode plate 46-
Positioning of 1 to 46-12 can be accurately performed.

Further, each divided electrode plate 46-1 to 46-12
As shown in FIG. 2, the portions of the stator protruding to the outside of the stator constitute external connection terminals 45-1 to 45-12, and lead wires 64-1 to 64-12 as shown in FIG.
12 will be connected.

Further, on the outer periphery of the second electrode plate 48, an external connection terminal 49 projecting to the outside of the stator portion 40.
Is provided, and the lead wire 66 for grounding is connected to this, as shown in FIG.

Further, the metal block bodies 50, 5 of this embodiment
2 are connected and fixed to each other by a metal coupling bolt 54. Therefore, when the second electrode plate 48 is grounded, the second metal block body 52 and the connecting bolt 5 are automatically connected.
4, The 1st metal block body 50 becomes earth potential. Therefore, the first metal block body 50 includes the piezoelectric element 42.
Similarly to the second electrode plate 48, it will function as a ground electrode on one side of. The connecting bolt 54
Are electrically insulated from the piezoelectric elements 42 and 44 and the first electrode plate 46 by the insulating collar 56.

The motor control circuit 80 includes the A-phase split electrode plates 46-1, 46-3, ..., 46-11, the B-phase split electrode plates 46-2, 46-4 ,.・ 、 46
By applying AC voltages of A phase and B phase having a phase difference of approximately 90 degrees to -12, the divided electrode plates 46-
Piezoelectric element 4 in contact with 1, 46-2, ..., 46-12
Vibration corresponding to the AC voltage is generated in the A-phase and B-phase voltage application regions 2, 44. Then, the respective vibrations generated here are combined to generate a traveling wave on the rotor contact surface 60 of the stator portion 40, whereby the rotor portion 30 in contact with the rotor contact surface 60 is rotationally driven.

FIG. 4, FIG. 6 and FIG. 7 show the outline of the operating principle of this embodiment.

FIG. 4 is a diagram in which the stator portion 40 is developed in the circumferential direction. The symbol "+" indicates a region extending when the potential of the applied AC voltage is positive, and the symbol "-" indicates the AC applied. Each of the regions shrinks when the voltage potential is positive.

FIG. 6A shows the applied voltage when the rotor portion 30 is rotationally driven in the forward direction. In this case, the A-phase AC applied to the A-phase piezoelectric application regions of the piezoelectric elements 42 and 44 is shown. The phase of the voltage and the B-phase AC voltage applied to the B-phase piezoelectric application region is set to +90 degrees (or approximately +90 degrees). As a result, as shown in FIG. 7, a traveling wave is generated on the rotor contact surface 60 of the stator portion 40, and the rotor portion 30 is rotationally driven in the forward direction indicated by the arrow in the figure.

On the other hand, FIG. 6B shows the rotor portion 30.
Is shown in the case of rotationally driving in the opposite direction. In this case, the phase of the A-phase AC voltage applied to the A-phase piezoelectric application region and the phase of the B-phase AC voltage applied to the B-phase piezoelectric application region is −.
It is set to 90 degrees (or approximately -90 degrees). As a result, a traveling wave is generated in the rotor contact surface 60 of the stator portion 40 in the direction opposite to that in FIG. 7, and the rotor portion 30 is rotationally driven in the opposite direction.

As described above, according to this embodiment, by switching the phases of the A-phase AC voltage and the B-phase AC voltage to +90 degrees and -90 degrees, the rotor section 30 can be driven in the forward and reverse directions. it can. Moreover, without the need for torsional vibration,
Since the traveling wave can be directly generated on the rotor contact surface, the structure of the motor can be simplified and the rotation output can be efficiently generated.

By the way, in order to drive the vibration motor of this embodiment more efficiently, the frequency of the AC voltage is
It is preferable that the value (resonance frequency) is such that the stator 40 causes a resonance phenomenon.

FIG. 5 conceptually shows a state of bending vibration caused by bending of a beam generated in the stator portion 40 when the entire stator portion 40 is formed into a flat shape. Same figure (A)
And (B), the stator portion 40 in which bending vibration is generated.
Is shown, and FIGS. 7C and 7D are side views of the stator section 40 shown in FIGS. As shown in the figure, in the vibration motor of the present invention, elliptical vibration can be directly generated in the stator portion by using bending vibration due to bending of the beam.

Next, the formula f representing the resonance frequency of the bending vibration due to the bending of the "beam" will be briefly described. This formula is roughly expressed by the following formula.

F = (2π / λ ² ) (E / ρ) ^1/2 (I 0 / A) ^1/2 λ; wavelength λ = π (D + d) / 2N (D: outer diameter, d: inner diameter, N: Wave number (number of peaks) The primary resonance, the secondary resonance, the tertiary resonance, ... Have different values.

(E / ρ) ^1/2 ; speed of sound (E is Young's modulus, ρ is density) (I0 / A) ^1/2 ; cross section secondary radius (I0 is cross section moment of inertia, A is stator part 40) Therefore, for example, D, d, and 1 of the stator portion take values as shown in FIG. 8, λ and the like have the following values, and the metal block bodies 50 and 52 are made of aluminum. Considering the vibration model, λ = 0.126 [m],
(E / ρ) ^1/2 is about 5000 [m / s], (I0 / A)
^1/2 is about 5.8 × 10 ⁻³ [m].

In this vibration model, the value of the resonance frequency f of the stator section 40 is about 11.5 kHz.

FIG. 9 shows a specific structure of the control circuit 80 for controlling the operation of the vibration motor.

The control circuit 80 includes a power supply circuit 90 for outputting an A-phase AC voltage and a B-phase AC voltage having different phases by 90 degrees.
And a corresponding divided electrode plate 46-1 for amplifying the AC output.
~ 46-12 and an amplifier 92 for applying to.

The control circuit 80 is turned on / off.
Switch 82, rotation direction input unit 86, rotation speed input unit 8
Including 8.

The ON / OFF switch 82 controls ON / OFF of the power supply circuit 90 and the amplifier 92.

The rotation direction input section 86 is the rotor section 30.
The rotation direction is selectively set, and its output signal is input to the power supply circuit 90. Based on this input signal, the power supply circuit 90 drives the rotor unit 30 in the normal direction,
As shown in FIG. 6A, when the phase difference between the A-phase AC voltage and the B-phase AC voltage is set to +90 degrees and the rotor unit 30 is driven in the reverse direction, as shown in FIG. The phase difference between the phase AC voltage and the phase B AC voltage is set to -90 degrees.

Further, the rotational speed input section 88 can set the rotational speed of the rotor section 30 by controlling the amplification factor of the amplifier 92.

Therefore, when the ON / OFF switch 82 is turned on after setting the rotation direction and the rotation speed of the rotor section 30 by using the input sections 86 and 88, the power supply circuit 90 sets the frequency according to the setting. The high frequency AC voltage of is output. This is amplified by the amplifier 92 and the lead line 64-1
To 64-12 to apply the piezoelectric elements 42, 4
The above-mentioned AC voltage can be applied to 4 to rotate the rotor unit 30.

At this time, since the AC voltage applied to the piezoelectric elements 42 and 44 is controlled to the resonance frequency corresponding to the resonance mode, the input voltage is efficiently converted into the rotation output, and the rotor section 30 is rotationally driven. can do.

Further, according to the vibration motor device of the present embodiment, each lead wire 64-1 is controlled by the rotation direction input section 86.
The rotation direction of the rotor unit 30 can be selectively determined by switching the phases of the A-phase and B-phase AC voltages to be applied to ~ 64-12.

Further, in the vibration motor device of the embodiment, the rotation speed of the rotor section 30 can be controlled to an arbitrary speed by controlling the voltage value of the AC voltage using the rotation speed input section 88.

Further, in the vibration motor of the embodiment, the piezoelectric elements 44 and 42, the first and second electrode plates 46 and 48, and the first and second metal block bodies 50 and 52 are connected to the coupling bolts 54 and the like, respectively. By tightening with the tightening member, each component can be connected and fixed to form the stator portion 40, and it becomes unnecessary to apply an adhesive to the joint surface of the component. Therefore, it is possible to prevent the variation of the resonance frequency among the motors and the decrease of the Q value as in the case where the adhesive is used, thereby improving the performance and reliability of the ultrasonic motor.

Further, in the present embodiment, only one type of vibration called bending vibration is used to generate the traveling wave, and two kinds of vibrations such as longitudinal vibration and torsional vibration are required as in the conventional ultrasonic motor. do not do. Therefore, the degree of freedom in designing the stator section 40, particularly in designing the metal block bodies 50 and 52, is increased, and the motor can be downsized. Further, since the plate-shaped metal block bodies 50 and 52 are used, the entire vibration motor including the stator portion 40 can be flattened.

FIG. 10 shows a sectional structure when the vibration motor of this embodiment is attached to a housing to be commercialized.

On the rotor contact surface 60 of the stator portion 40, the disc 32 of the rotor portion 30 is attached to the leaf spring 100 and the plate 102.
And press contact. A rotary output shaft (shaft) 34 is fixed to the disc 32 by a C ring 104 (other than the C ring is possible). A rotation stopper is provided between the disc 32 and the rotation output shaft 34, and when the disc 32 rotates, the rotation output shaft 34 also rotates.

The connecting bolt 54 has a rotary shaft insertion hole 5 at the center.
It has a hollow structure having 4a (the vibration motor of FIG. 3 shows the principle, and the hollow structure is omitted), and the rotary output shaft 43 is inserted into the rotary shaft insertion hole 54a. Is rotatably inserted. Also, the connecting bolt 5
4 may be provided with a partial vibration damping portion D, and the vibration damping portion D may have a structure in which the cross-sectional area is rapidly reduced to damp the vibration generated by the stator portion 40.

The housing 106 is attached and fixed by a screw 108 (other than a screw) near one end of the coupling bolt 54, and the bearing 11 fitted in the vicinity of the central portion.
The rotation output shaft 34 is supported by the shaft 4.

The cover 110 also includes the housing 106.
Is fixed by screws 112 (other than screws are also possible), and covers the stator portion 40 and the rotor portion 30 from the outer peripheral portion to protect them.

In the vibration motor having such a structure, since the stator portion 40, especially the metal block bodies 50 and 52 can be flattened, the whole housing including the housing 106 and the cover 110 can be flattened and downsized. Becomes

FIG. 11 shows a modification of this embodiment. The members corresponding to those in the above-described embodiment are designated by the same reference numerals, and the description thereof will be omitted.

A feature of the present embodiment is to provide a vibration motor having a simple structure and a low cost by constructing the vibration generating section using one piezoelectric element 44. This vibration motor has a driving force of about half that of the vibration motor shown in FIG. 1 and the like, and is used for relatively small output applications.

That is, the stator portion 40 of this embodiment is
Only the first piezoelectric element 44 is provided, and the second piezoelectric element 42 shown in FIG. 3 is replaced with an insulating plate 43. The insulating plate 43 is for electrically insulating the first metal block body 50 and the divided electrode plates of the first electrode plate 46, which have the same potential as the ground. Other configurations are the same as those of the vibration motor shown in the first embodiment.

In order to drive the rotor portion 30 to rotate by using the vibration motor constructed as described above, wiring is performed exactly as in the first embodiment, and the A-phase and B-phase AC voltages are applied. .. By applying this voltage, vibration can be generated in each divided region of the piezoelectric element 44, and the rotor portion 30 can be driven to rotate normally or reversely.

Second Embodiment FIG. 12 shows a second preferred embodiment of the present invention. The members corresponding to those in the above-described first embodiment and the like are designated by the same reference numerals, and the description thereof will be omitted.

In the first embodiment, the piezoelectric elements 42 and 44 are
Although both the A-phase and B-phase voltage application regions are formed in the present embodiment, in the present embodiment, only the A-phase voltage application region is formed in the piezoelectric element 42 and the B-phase voltage application region is formed in the piezoelectric element 44. However, it is characterized in that it is formed so as to have the same effect as the vibration motor of the first embodiment.

The electrode plate 46A of the present embodiment is 6 degrees apart every 60 degrees.
It is divided, and an A-phase AC voltage is applied to each divided region. Similarly, the electrode plate 46B is divided into six 60 degrees, and a B-phase AC voltage is applied to each divided region.
The insulating plate 43 is sandwiched between the two electrode plates 46A and 46B, and the first and second electrode plates 46A and 46B are separately provided.
Similar to the embodiment, the A-phase and B-phase AC voltages can be applied.

The piezoelectric element 42 is divided into six parts at intervals of 60 degrees corresponding to one electrode plate 46A, and is formed so that the polarization directions of the adjacent divided regions are opposite. Also,
The piezoelectric element 44 is divided into six parts every 60 degrees corresponding to the other electrode plate 46B, and is formed so that the polarization directions of the adjacent divided regions are opposite. Piezoelectric elements 42 and 44
Are arranged such that the phases of the polarized regions are shifted from each other by 30 degrees.

FIG. 13 is a diagram in which the stator portion 40 is developed in the circumferential direction. The symbol “+” indicates a region extending when the potential of the applied AC voltage is positive, and the symbol “−” indicates the applied AC voltage. The respective regions shrink when the potential of is positive.

FIG. 14 shows applied voltages when the rotor portion 30 is rotationally driven in the forward direction. In this case, the A-phase AC voltage applied to the electrode plate 46A and the B-phase AC voltage applied to the electrode plate 46B are shown. +90 degree phase difference with AC voltage (or almost +
90 degrees). As a result, as shown in FIG. 7, a traveling wave is generated on the rotor contact surface 60 of the stator portion 40, and the rotor portion 30 is rotationally driven in the forward direction indicated by the arrow in the figure.

On the contrary, the A phase AC voltage and the B phase
By setting the phase difference from the phase AC voltage to -90 degrees (or approximately -90 degrees), a traveling wave in the opposite direction to the above is generated, and the rotor section 30 is rotationally driven in the opposite direction.

As described above, according to this embodiment, the two piezoelectric elements 42 and 44 are laminated and arranged, and the electrode plate 46A has a plurality of A-phases on the polarization plane of the piezoelectric element 42 along the rotor rotation direction. Voltage application regions are sequentially formed, and the electrode plate 46B similarly sequentially forms a plurality of B-phase voltage application regions on the polarization surface of the piezoelectric element 44. Therefore, the A-phase voltage application regions and the B-phase voltage application regions are formed so as to be substantially alternately located along the rotor rotation direction. Therefore, the substantial structure is the same as that of the first embodiment, and the traveling wave can be generated on the rotor contact surface 60 and the rotor portion 30 can be rotationally driven.

FIG. 15 shows a modification of this embodiment. In this embodiment, the piezoelectric elements 42 and 44 are laminated so that their polarization planes face upward and downward in the figure, and an electrode plate 48 for grounding is arranged between the piezoelectric elements 42 and 44. Then, electrode plates 46A and 46B are similarly laminated and arranged on the upper and lower surfaces of the piezoelectric elements 42 and 44 in the figure, and further, insulating plates 43-1 and 46B are arranged between the electrode plates 46A and 46B and the block bodies 50 and 52, respectively. 43-2 is laminated and arranged.

With the above structure, the same operational effects as those of the second embodiment can be obtained.

Third Embodiment FIG. 16 shows a preferred third embodiment of the present invention. The vibration motor device of the embodiment has three phases of A phase, B phase, and C phase.
It is formed as a three-phase traveling wave type using a phase alternating voltage. The members corresponding to those in the first and second embodiments described above are designated by the same reference numerals, and the description thereof will be omitted.

In this embodiment, the electrode plate 46 is divided into 12 at every 30 degrees, and the divided electrode plates 46-1 and 46 are divided.
-2, ..., 46-12 are A-phase AC voltage application regions (46-3, 46-6, ..., 46-12) and B-phase AC voltage application regions (46-2, 46). -5, ..., 46
-11), C-phase AC voltage application region (46-1, 46-
4, ..., 46-10).

The piezo-electric elements 42 and 44 are set at 4 degrees every 90 degrees.
It is divided into two polarization regions. The adjacent polarization regions are formed so that their polarization directions are opposite to each other. In the figure, reference numerals (+, −) indicate piezoelectric elements 42, 4
4 shows the polarization direction. The piezoelectric elements 42 and 44 are laminated so that polarized regions having the same sign face each other.

In each polarization region of the piezoelectric elements 42 and 44, three divided electrode plates of the electrode plate 46 are arranged,
Three-phase AC voltage of A phase, B phase, and C phase can be applied.

FIG. 17 is a diagram in which the stator portion 40 is expanded in the circumferential direction. The symbol “+” indicates a region extending when the potential of the applied AC voltage is positive, and the symbol “−” indicates the applied AC voltage. The respective regions shrink when the potential of is positive.

FIG. 18 shows a concrete structure of the control circuit 80 for controlling the operation of the vibration motor of the embodiment.
The members corresponding to those of the control circuit shown in FIG. 9 are designated by the same reference numerals and the description thereof will be omitted.

The control circuit 80 includes a power supply circuit 90 for outputting an A-phase AC voltage, a B-phase AC voltage, and a C-phase AC voltage having different phases by 60 degrees, and a corresponding divided electrode plate 46-1 for amplifying the AC output. ~ 46-12 and an amplifier 92 for applying to.

The rotation direction input section 86 is the rotor section 30.
The rotation direction is selectively set, and its output signal is input to the power supply circuit 90. Based on this input signal, the power supply circuit 90 drives the rotor unit 30 in the normal direction,
As shown in FIG. 19, each phase difference of the A-phase AC voltage, the B-phase AC voltage, and the C-phase AC voltage is set to +60 degrees (or approximately +60 degrees). When the rotor unit 30 is driven in reverse, the phase difference between the A-phase AC voltage, the B-phase AC voltage, and the C-phase AC voltage is set to -60 degrees (or approximately -60 degrees).

That is, when the rotor portion 30 is rotationally driven in the forward direction, the electrode plate 46 divided into 12 at every 30 degrees.
AC voltage application region of phase A (46-3, 46-6, ...
, 46-12), B-phase AC voltage application region (46-
2, 46-5, ..., 46-11), C-phase AC voltage application region (46-1, 46-4, ..., 46-10)
The phase difference of the A-phase AC voltage, the B-phase AC voltage, and the C-phase AC voltage to be applied to is set to +60 degrees. As a result, two traveling waves are generated on the rotor contact surface 60 of the stator section 40, and the rotor section 30 is rotationally driven in the forward direction.

On the contrary, by setting each phase difference of the A-phase AC voltage, the B-phase AC voltage, and the C-phase AC voltage to -60 degrees, a traveling wave in the opposite direction to the above is generated, The rotor unit 30 is rotationally driven in the opposite direction.

FIG. 20 shows a modification of this embodiment. The members corresponding to those in the above-described embodiment are designated by the same reference numerals, and the description thereof will be omitted.

In the third embodiment, the traveling wave of two peaks is generated on the rotor contact surface 60 of the stator portion 40. However, the characteristic of this embodiment is that one wave is formed on the rotor contact surface 60 of the stator portion 40. A traveling wave is generated to drive the rotor unit 30 to rotate.

The electrode plate 46 of this embodiment is divided into six parts at intervals of 60 degrees, and the divided electrode plates 46-1, 46-2, ...
, 46-6 are A-phase AC voltage application regions (46-3,
46-6,), B-phase AC voltage application region (46-2, 4
6-5), C-phase AC voltage application region (46-1, 46-
4) It functions as.

The piezoelectric elements 42 and 44 are divided into two parts every 180 degrees, and two adjacent polarization regions are formed so that their polarization directions are opposite to each other.

In each polarization region of the piezoelectric elements 42 and 44, three divided electrode plates of the electrode plate 46 are arranged,
The above-mentioned three-phase AC voltage of A phase, B phase, and C phase can be applied.

With the above configuration, one traveling wave can be generated on the rotor contact surface 60 of the stator portion 40, and the rotor portion 30 can be rotationally driven.

FIG. 21 shows a modification of FIG. 20. The members corresponding to those in the above-described embodiment are designated by the same reference numerals, and the description thereof will be omitted.

In the above embodiment, the two piezoelectric elements 42, 4
4 is used, the present embodiment is to provide an inexpensive vibration motor having a simple structure by forming the vibration generating unit using one piezoelectric element 44. This vibration motor has a driving force that is about half that of the vibration motor shown in FIG. 20 and the like, and is used for relatively small output applications.

Here, the stator portion 40 has only the first piezoelectric element 44, and has a structure in which the second piezoelectric element 42 shown in FIG. 20 is replaced with an insulating plate 43. The insulating plate 43 is for electrically insulating the first metal block body 50 and the first electrode plate 46, which have the same potential as the ground. Other configurations are the same as those of the vibration motor shown in the third embodiment.

Fourth Embodiment FIG. 22 shows a fourth preferred embodiment of the present invention. The vibration motor device of the embodiment has three phases of A phase, B phase, and C phase.
It is formed as a three-phase traveling wave type using a phase alternating voltage. The members corresponding to those in the third embodiment described above are designated by the same reference numerals, and the description thereof will be omitted.

In this embodiment, the electrode plate 46 is divided into 12 at intervals of 30 degrees, and the divided electrode plates 46-1 and 46 are divided.
-2, ..., 46-12 are A-phase AC voltage application regions (46-1, 46-4, ..., 46-10) and B-phase AC voltage application regions (46-2, 46). -5, ..., 46
-11), C-phase AC voltage application region (46-3, 46-
6, ..., 46-12).

The piezoelectric elements 42 and 44 are divided into 12 polarization regions every 30 degrees corresponding to the divided electrode plates 46-1, 46-1, ..., 46-12. The adjacent polarization regions are formed so that their polarization directions are opposite to each other. In the figure, the symbols (+, −) indicate the polarization directions of the piezoelectric elements 42, 44. Piezoelectric element 42,
Reference numeral 44 is laminated so that polarized regions having the same sign face each other.

Then, in the polarization regions of the piezoelectric elements 42 and 44, the divided electrode plates 46-1 and 46- of the electrode plate 46 are formed.
1, ..., 46-12 are arranged so that three-phase AC voltages of A phase, B phase, and C phase can be applied.

FIG. 23 is a diagram in which the stator portion 40 is developed in the circumferential direction. The symbol “+” indicates a region extending when the potential of the applied AC voltage is positive, and the symbol “−” indicates the applied AC voltage. The respective regions shrink when the potential of is positive.

Further, FIG. 24 shows the motor control circuit 8 of the embodiment.
A specific configuration of 0 is shown. Note that FIG. 9 and FIG.
The same reference numerals are given to the members corresponding to those in the control circuit shown in FIG.

The control circuit 80 includes a power supply circuit 90 that outputs an A-phase AC voltage, a B-phase AC voltage, and a C-phase AC voltage having different phases by 120 degrees, and a corresponding divided electrode plate 46-1 that amplifies the AC output. ~ 46-12 and an amplifier 92 for applying to.

The rotation direction input section 86 is the rotor section 30.
The rotation direction is selectively set, and its output signal is input to the power supply circuit 90. Based on this input signal, the power supply circuit 90 drives the rotor unit 30 in the normal direction,
As shown in FIG. 25, each phase difference of the A-phase AC voltage, the B-phase AC voltage, and the C-phase AC voltage is +120 degrees (or approximately +120 degrees).
When the rotor portion 30 is driven in reverse, the phase difference between the A-phase AC voltage, the B-phase AC voltage, and the C-phase AC voltage is -120 degrees (or approximately -120 degrees). Set to.

That is, in this case, in which the rotor portion 30 is rotationally driven in the forward direction, the divided electrode plates 46-1, 46-2, ...
6-12, that is, the A-phase AC voltage application region (46-
1, 46-4, ..., 46-10), B-phase AC voltage application region (46-2, 46-5, ..., 46-1)
1), C-phase AC voltage application region (46-3, 46-6,
The phase difference of the A-phase AC voltage, the B-phase AC voltage, and the C-phase AC voltage applied to (46-12) is set to +120 degrees. As a result, the rotor contact surface 60 of the stator 40 is
2 traveling waves are generated, and the rotor unit 30 is rotationally driven in the forward direction.

On the contrary, by setting each phase difference of the A-phase AC voltage, the B-phase AC voltage, and the C-phase AC voltage to -120 degrees, a traveling wave in the opposite direction to the above is generated,
The rotor unit 30 is rotationally driven in the opposite direction.

FIG. 26 shows a modification of this embodiment. The members corresponding to those in the above-described embodiment are designated by the same reference numerals, and the description thereof will be omitted.

In the fourth embodiment, two peaks of traveling waves are generated on the rotor contact surface 60 of the stator portion 40, but the feature of this embodiment is that one peak is formed on the rotor contact surface 60 of the stator portion 40. This is to generate a traveling wave to drive the rotor unit 30 to rotate.

The electrode plate 46 of the present embodiment is divided into six parts at intervals of 60 degrees, and the divided electrode plates 46-1, 46-2, ...
, 46-6 are A-phase AC voltage application regions (46-1,
46-4), B-phase AC voltage application region (46-2, 46
-5), C-phase AC voltage application region (46-3, 46-
6) It functions as.

The piezoelectric elements 42 and 44 are divided into six portions every 60 degrees corresponding to the electrode plate 46, and six adjacent polarization regions are formed so that their polarization directions are opposite to each other.

Each divided electrode plate of the electrode plate 46 is arranged in each polarization region of the piezoelectric elements 42 and 44 so that the above-mentioned three-phase AC voltage of A phase, B phase, and C phase can be applied. It has become.

With the above configuration, a traveling wave of one peak can be generated on the rotor contact surface 60 of the stator section 40 to drive the rotor section 30 to rotate.

FIG. 27 shows another embodiment obtained by modifying FIG. 26. The members corresponding to those in the above-described embodiment are designated by the same reference numerals and the description thereof is omitted.

In the above embodiment, the two piezoelectric elements 42, 4
4 was used, the feature of this embodiment is that one piezoelectric element 44 is used.
It is to provide a vibration motor having a simple structure and a low cost by configuring the vibration generating unit using. This vibration motor has a driving force that is about half that of the vibration motor shown in FIG. 26 and the like, and is used for relatively small output applications.

The stator portion 40 of this embodiment has only the first piezoelectric element 44, and the second piezoelectric element 4 shown in FIG.
2 is replaced by an insulating plate 43. The insulating plate 43 is for electrically insulating the first metal block body 50 and the divided electrode plates of the first electrode plate 46, which have the same potential as the ground. Other configurations are the same as those of the vibration motor shown in the fourth embodiment.

Fifth Embodiment FIG. 28 shows a preferred fifth embodiment of the present invention. The vibration motor device of the embodiment has three phases of A phase, B phase, and C phase.
It is formed as a three-phase traveling wave type using a phase alternating voltage. The members corresponding to those in the above-mentioned four embodiments are designated by the same reference numerals, and the description thereof will be omitted.

In the third embodiment, the piezoelectric elements 42 and 44 are
Although the A-phase, B-phase, and C-phase voltage application regions are formed on the piezoelectric element 42A, only the A-phase voltage application region is formed on the piezoelectric element 42A and only the B-phase voltage application region is formed on the piezoelectric element 42B. It is characterized in that only the C-phase voltage application region is formed in the piezoelectric element 42C, and the same effect as the vibration motor of the third embodiment is obtained.

That is, the electrode plate 46A of this embodiment is 9
The A-phase AC voltage is applied to each divided region. Similarly, the electrode plate 46B is divided into four parts every 90 degrees, the B-phase AC voltage is applied to each divided region, and the electrode plate 46C is divided into four parts every 90 degrees.
A C-phase AC voltage is applied to each divided region.

Each piezoelectric element 42A, 42B, 42C
Is 9 depending on the corresponding electrode plates 46A, 46B, 46C.
It is divided into four at every 0 degree, and is formed so that the polarization directions of the adjacent divided regions are opposite. The piezoelectric element 4
The polarized surfaces of 2A and 42B are oriented vertically, and the ground electrode plate 48-1 is sandwiched between the two. A piezoelectric element 46A is laminated on the polarized surface of the piezoelectric element 42A, and an electrode plate 46B is laminated on the polarized surface of the other piezoelectric element 42B. The remaining electrode plate 46C has an electrode plate 46C on its polarization surface.
Are laminated and the ground electrode plate 48-2 is laminated on the other surface. The electrode plates 46A, 46B, 4
6C shows that the respective divided electrode plates are piezoelectric elements 42A, 42A.
It is laminated so as to face the corresponding polarization regions of B and 42C.

An insulating plate 43-1 is laminated between the electrode plate 46A and the block body 50, and the electrode plate 4 is
An insulating plate 43-2 is laminated between 6B and 46C. As a result, in the same manner as in the fourth embodiment, the A phase, b
Phase and C phase AC voltage are independently applied to each piezoelectric element 42.
It can be applied to A, 42B and 42C.

In this embodiment, each piezoelectric element 42 is
A, 42B, and 42C have a phase in which their polarization regions are 3
The feature is that they are arranged so as to be shifted by 0 degree.

FIG. 29 is a diagram in which the stator portion 40 is developed in the circumferential direction. The symbol “+” indicates a region extending when the potential of the applied AC voltage is positive, and the symbol “−” indicates the applied AC voltage. The respective regions shrink when the potential of is positive.

As shown in the figure, in the stator section 40, the respective polarization regions of the piezoelectric elements 42A, 42B and 42C which are arranged in layers are three-dimensionally arranged with their phases shifted by 30 degrees.

Therefore, by using the control circuit 80 as shown in FIG. 30, each of the electrode plates 46A, 46B and 46C has the structure shown in FIG.
By applying a three-phase AC voltage as shown in (3), a traveling wave is generated on the rotor contact surface 60 of the stator 40, and the rotor portion 30 can be driven in the normal direction. That is, to the electrode plates 46A, 46B, and 46C, the A-phase AC voltage having a phase difference of 60 degrees (or approximately +60 degrees),
By applying the B-phase AC voltage and the C-phase AC voltage, a traveling wave is generated on the rotor contact surface 60, and the rotor unit 30 can be rotationally driven in the forward direction.

On the contrary, from the motor control circuit 80-
A with a phase difference of 60 degrees (or nearly -60 degrees)
By applying the phase AC voltage, the B phase AC voltage, and the C phase AC voltage in the same manner, a traveling wave in the opposite direction is generated on the rotor contact surface 60 of the stator portion 40, and the rotor portion 30 is driven in reverse. You can

FIG. 32 shows a modification of this embodiment. The difference from this embodiment is that the polarization surface of the piezoelectric element 42B is directed upward in the figure, and the electrode plates 4 are provided on both surfaces of this piezoelectric element.
6B, the grounding electrode plates 48-3 are arranged in layers. Then, the insulating plate 43-3 is laminated between the grounding electrode plate 48-1 and the electrode plate 46B so that A
The phase, B phase, and C phase piezoelectric elements 42A, 42B, and 42C are insulated from each other. The configuration other than this is the same as that of FIG. 28 described above, and thus the description thereof is omitted here.

With the above structure, the same operational effect as that of this embodiment can be obtained.

FIG. 33 shows another modification of this embodiment. In this modification, each piezoelectric element 42A, 42A
It is characterized in that B and 42C are laminated and arranged so that the phases of their polarized regions are shifted from each other by 60 degrees.

In this case, as shown in FIG. 34, the A-phase AC voltage, the B-phase AC voltage, and the C-phase AC voltage having different phases by 120 degrees (or approximately +120 degrees) are set in the same manner as in the above embodiment. , Corresponding electrode plates 46A, 46B, 46C
By applying the voltage to the piezoelectric elements 42A, 42B, 42C via, a forward traveling wave can be generated in the rotor contact surface 60, and the rotor portion 30 can be normally driven. On the contrary, by applying the A-phase, B-phase, and C-phase AC voltages having different phases by -120 degrees (or approximately -120 degrees) in the same manner, a traveling wave in the opposite direction is generated, The rotor unit 30 can be rotationally driven in the opposite direction.

The present invention is not limited to the above embodiments, and various modifications can be made within the scope of the gist of the present invention.

For example, in each of the above-mentioned embodiments, the electrode plate 4
6 and the piezoelectric elements 42, 44, etc. must be positioned in the circumferential direction. As a method of this positioning, for example, as shown in FIG.
6a is formed, and the electrode plate 46 and the piezoelectric element 4 facing it are formed.
Positioning groove portions 51 are provided on the inner peripheral portions of 2, 44 and the like. By assembling the stator part 40 while fitting the groove part 51a and the protrusion part 56a, the electrode plate 46
It is possible to determine the precise positions of the piezoelectric elements 42 and 44.

Further, in each of the above-described embodiments, the case where the traveling wave is generated on the rotor contact surface 60 of the stator portion 40 by using the two-phase AC voltages having different phases or the three-phase AC voltages having different phases is taken as an example. Although described, the present invention is not limited to this, and if necessary, four or more AC voltages having different phases can be used to generate traveling waves in the same manner, and the rotor unit 30 can be rotationally driven.

Further, in the above embodiment, the case where the rotor portion 30 is provided only on one end surface of the stator portion 40 has been described as an example, but the present invention is not limited to this, and the rotor portion is provided on both end surfaces of the stator portion 40. It may be provided. Thereby, two rotation outputs can be taken out simultaneously from the vibration motor of the embodiment.

Further, according to the above embodiment, the block body 5
Although the case where the connecting bolt 54 is used for connecting and fixing 0 and 52 has been described as an example, since the present invention does not require torsional vibration unlike the conventional Langevin type ultrasonic motor, the connecting member other than the connecting bolt 54 is used. Using the block 50,
52 may be connected and fixed.

Further, although the embodiment has been described by taking the case where the rotor contact surface 60 is formed in a planar shape as an example, the present invention is not limited to this, and for example, as shown in FIG. A plurality of extended grooves 60a may be formed. As a result, the amplitude of the traveling wave generated can be increased, and the efficiency of rotation output can be increased. Further, since the abrasion powder generated by the abrasion between the rotor portion 30 and the rotor contact surface 60 falls into the groove 60a, the output reduction due to the abrasion powder can be prevented.

[0133]

As described above, according to the present invention, there is a large degree of freedom in design, the structure is simple, the rotational output can be efficiently generated, and bidirectional rotation is possible if necessary. Can be provided.

In particular, in the present invention, by forming the block body into a flat shape, it is possible to achieve flatness, downsizing and high efficiency of the entire vibration motor.

[Brief description of drawings]

FIG. 1 is an overall explanatory view of a preferred first embodiment of a vibration motor device according to the present invention.

FIG. 2 is a schematic perspective explanatory view showing a stator portion of the vibration motor device shown in FIG.

FIG. 3 is an exploded perspective view of a stator portion shown in FIG.

FIG. 4 is a schematic explanatory diagram when the stator portion shown in FIG. 2 is expanded in the rotor rotation direction.

FIG. 5 is a conceptual explanatory view of bending vibration generated in a stator portion.

FIG. 6 is an explanatory diagram of an AC voltage applied to the stator section.

FIG. 7 is an explanatory diagram showing a relationship between a traveling wave generated in a stator part and a rotation direction of a rotor part.

FIG. 8 is a diagram showing an example of a vibration model of a stator section.

9 is a block diagram of a control circuit used in the vibration motor device shown in FIG. 1. FIG.

10 is a cross-sectional view of a case where a housing and the like are assembled to the vibration motor device shown in FIG.

FIG. 11 is an exploded perspective view showing a modified example of the stator portion of the first embodiment.

FIG. 12 is an exploded perspective view of a stator portion according to a second embodiment of the present invention.

FIG. 13 is a schematic explanatory view of the stator portion shown in FIG. 12 developed in the circumferential direction.

14 is an explanatory diagram of an AC voltage applied to the stator section shown in FIG.

FIG. 15 is an exploded perspective view of a modification of the stator portion of the second embodiment.

FIG. 16 is an exploded perspective view of a stator portion according to a third embodiment.

FIG. 17 is a schematic explanatory diagram of a state where the stator portion according to the third embodiment is expanded in the circumferential direction.

FIG. 18 is a block diagram of a control circuit used in the vibration motor of the third embodiment.

FIG. 19 is an explanatory diagram of an AC voltage applied to the stator section of the third embodiment.

FIG. 20 is an exploded perspective view of a modification of the stator portion of the third embodiment.

FIG. 21 is an exploded perspective view of another modification of the stator portion of the third embodiment.

FIG. 22 is an exploded perspective view of a stator portion of the fourth embodiment.

FIG. 23 is a schematic explanatory diagram of a case where the stator portion shown in FIG. 22 is expanded in the circumferential direction.

FIG. 24 is a block circuit diagram of a motor control circuit according to a fourth embodiment.

FIG. 25 is an explanatory diagram of an AC voltage applied to the stator portion according to the fourth embodiment.

FIG. 26 is an exploded perspective view of a modification of the stator portion of the fourth embodiment.

FIG. 27 is an exploded perspective view of another modification of the stator portion of the fourth embodiment.

FIG. 28 is an exploded perspective view of a stator portion according to a fifth embodiment.

FIG. 29 is a schematic explanatory view of the stator portion of the fifth embodiment which is developed in the circumferential direction.

FIG. 30 is a block diagram of a motor control circuit according to a fifth embodiment.

FIG. 31 is an explanatory diagram of an AC voltage applied to the stator portion of the fifth embodiment.

FIG. 32 is an exploded perspective view of a modification of the stator portion of the fifth embodiment.

FIG. 33 is an explanatory diagram of another modification of the stator portion of the fifth embodiment.

FIG. 34 is an explanatory diagram of an AC voltage applied to the stator section shown in FIG. 33.

FIG. 35 is a schematic explanatory diagram of a positioning mechanism for an electrode plate and a piezoelectric element.

FIG. 36 is an explanatory diagram of a case where a groove portion is formed on the rotor contact surface of the stator portion.

FIG. 37 is an explanatory diagram of a conventional bolted Langevin type ultrasonic motor.

[Explanation of symbols]

 30 rotor part 40 stator part 42,44 piezoelectric element 43 insulating plate 46 electrode plate 48 electrode plate 50 metal block body 52 metal block body 54 coupling bolt 60 rotor contact surface 80 control circuit

Claims (6)

[Claims] 1. A stator unit, a rotor unit that contacts a rotor contact surface of the stator unit, and a motor control unit that applies a predetermined AC voltage to the stator unit. A piezoelectric element to be generated, electrodes for forming voltage application regions of multiple phases on the surface of the piezoelectric element along the rotation direction of the rotor part, and a plurality of blocks mounted and fixed on both sides of the piezoelectric element so as to sandwich the piezoelectric element. The motor control means generates a traveling wave on the rotor contact surface of the block body by applying AC voltages of a plurality of phases having different predetermined angular phases to the voltage application regions of the plurality of phases. A vibration motor device, which is formed and rotationally drives the rotor portion. 2. The vibration motor device according to claim 1, wherein the plurality of block bodies are formed in a flat shape. 3. The electrode according to claim 1, wherein the electrode is provided on the surface of the piezoelectric element along the rotation direction of the rotor portion.
The voltage application regions of the phases are alternately formed, and the motor control unit is configured so that the two-phase voltage application regions have a phase difference of approximately 90 degrees.
A vibration motor device characterized in that a traveling wave is generated on a rotor contact surface of the block body by applying a phase alternating voltage, and the rotor portion is rotationally driven. 4. The piezoelectric element according to claim 1, wherein the piezoelectric element includes a first piezoelectric element and a second piezoelectric element that are stacked and arranged, and the electrode is a surface of the first piezoelectric element. A first electrode that sequentially forms a plurality of first-phase voltage application regions along the rotation direction of the rotor unit; and a first-phase voltage application region and rotor rotation on the surface of the second piezoelectric element. A second electrode that sequentially forms a plurality of voltage application regions of the second phase along the rotation direction of the rotor unit at a position shifted in phase by a predetermined angular phase, and Along the voltage application region of the first phase and the voltage application region of the second phase are substantially alternately located, the motor control means, in the voltage application region of each phase, a phase of about 90 degrees. Different 2
A vibration motor device, wherein a traveling wave is generated on a rotor contact surface of the block body by applying a phase alternating voltage, and the rotor portion is rotationally driven. 5. The electrode according to claim 1, wherein the electrode is formed on the surface of the piezoelectric element along the rotation direction of the rotor portion.
The voltage control regions of the phases are alternately formed, and the motor control unit applies the three-phase AC voltages having different phases of approximately 60 degrees or 120 degrees to the voltage application regions of the three phases, whereby A vibration motor device characterized in that a traveling wave is generated on a rotor contact surface to drive the rotor portion to rotate. 6. The piezoelectric element according to claim 1, wherein the piezoelectric element includes a first piezoelectric element, a second piezoelectric element and a third piezoelectric element which are stacked and arranged, and the electrode includes: A first electrode that sequentially forms a plurality of first-phase voltage application regions on the surface of the first piezoelectric element along the rotation direction of the rotor section; and a first electrode on the surface of the second piezoelectric element. A second electrode for sequentially forming a plurality of voltage application regions of the second phase along a rotation direction of the rotor portion at a position where a predetermined angular phase is shifted in the rotor rotation direction with respect to the phase voltage application region; Along the rotation direction of the rotor portion, on the surface of the third piezoelectric element, at a position where a predetermined angular phase is shifted in the rotor rotation direction with respect to the first-phase voltage application region and the first-phase voltage application region. And a third electrode that sequentially forms a plurality of voltage application regions of the third phase The motor control means applies a traveling wave to the rotor contact surface of the block body by applying a three-phase AC voltage having a phase difference of approximately 60 degrees or 120 degrees to the voltage application region of the three phases. A vibration motor device, which is generated and rotationally drives the rotor portion.