JPS6062882A - Piezoelectric motor of slide mode drive - Google Patents

Abstract

PURPOSE:To reversely move instantaneously a movable element by press-bonding a piezoelectric vibrator of slide mode onto the slide surface of the movable element. CONSTITUTION:Twisting piezoelectric vibrators 4, 5 of slide mode are contained in a case 11, and a clamping bolt 6 and the pawls 12 of the case 11 are engaged with the bolt 6 so that the vibrators 4, 5 do not rotate. The disc surfaces of a twisting slide plate 7 are formed of sheaths 13, and a rotor 10 in which bearings are mounted in the bores is press-bonded. Press-bonding elements 14 are of laminated piezoelectric elements, and when the same signal as applied to the plate 7 is applied, the rotor 10 is press-bonded to the disc surface of the periodic twisting plate 7 through the bearings. When the applied signal is in positive phase, the rotor 10 is rotated in positive direction, and when the applied signal to the element 14 is in reverse phase, the rotor 10 is instantaneously rotated reversely.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a piezoelectric motor, particularly a spiral motor "EI".
iha) 12・IxJσ)+”l&white fi〈mm:tb
! Orm? The purpose is to provide P$-tar.

The inventor of the present invention recently invented a "piezoelectric motor driven by a piezoelectric mode" and filed an application at the same time as this patent application.

This [spiral mode drive piezoelectric motor] differs from the previous "Kiratsuki-ya" motor in that it has significantly less wear on the sliding surface; it is a highly practical motor with features, but the rotational direction force 1 It was determined by the structure and could not be reversed.

A piezoelectric motor (characterized by low speed and large torque) can instantaneously reverse the direction of rotation (and (), and an important drawback is that it cannot be reversed due to its strong force.

Therefore, the present invention solves the above-mentioned drawbacks of the prior art, and it is possible to obtain a moving torque by sliding by pressing the sliding surface of the mover against the disk surface of the sliding coupling of the piezoelectric vibration in the sliding mode. This objective was achieved using a piezoelectric motor driven in a sliding mode, which is characterized by the following.

The shuffling mode piezoelectric vibrator and woko described here refer to the "sliding mode piezoelectric vibrator using a buckling spring" recently invented by the present inventors and filed at the same time as this case. As an example, an overview of a torsional mode vibrator is shown in FIG.

Donut-shaped piezoelectric ceramic vibrators 1 and 2 are stacked on a torsion mode coupler 3 using a buckling spring, and a disk-shaped vibrator 4. and 5 are sandwiched together and tightened with bolts 6. When a high frequency electric signal of several tens of KHz is applied between the lead wires 8 and 90, the torsional sliding plate 7 makes a torsional reciprocating motion.

Next, examples of the present invention will be described.

Example 1 A torsion mode piezoelectric vibrator using a buckling spring shown in FIG. 1 with the outer diameter of the vibrators 4 and 5 being 35 rnuφ and a length of 44 mm was housed in the case 11 shown in FIG. To prevent the vibrator 4.5 from rotating, tighten the tightening bolt 6 and the claw 12 of the case.
was fitted to vibrator 4.5. A torsion sliding plate 7 with a diameter of 60 TAm and a thickness of 3 vrm protrudes from the center of the case 11, and is connected to the case 11 by a ball bearing. The disk surface of this torsion sliding plate 7 is made of gun metal 13
The rotor IO, which has a bearing attached to its inner diameter, is crimped onto it. The crimp 14 is a laminated piezoelectric element, and when the same signal as that applied to the torsional diaphragm 7 is applied,
The rotor 10 is rotated periodically through the bearing and the sliding plate 7
Press it onto the disc surface. When the applied signal has a positive phase, the rotor 10 rotates in the positive direction at about 50 rpm. When the signal applied to the crimping element 14 is reversed in phase by changing the lead wires, the rotor 10 instantaneously rotates in the opposite direction, rotating approximately 50 or so in the opposite direction.
It rotated at a rotation speed of pm. Since the rotation speed and torque are determined by the crimp element 140 phase and crimping force, the function of the crimp element 14 plays an important role in determining the performance of this kind of torsion mode piezoelectric motor.

Here, we have described an example of the crimp 14 that uses a laminated piezoelectric element as the driving source, but many other alternative elements can be considered, and a strong crimp force with an amplitude of 10 μm or more at several tens of KHz can be obtained. In that case, you can use anything.

Embodiment 2 In Embodiment 1, an example of a motor using a torsion mode vibrator among the limp mode vibrators was described, but here an example of a one-dimensional linear motor will be described. Figure 3 (
a) and (b) are 12 near reversible sliding modes.
It is an explanatory view of a motor. The mover is the rail 10, which is the rotor of the rail 10 cam motor, and moves linearly back and forth with respect to the stator of the main body. The structure is 10mm wide
Piezoelectric vibrators 1 and 2 of
Overlap on a surface of 40 mm x 60 mm
, sandwiched between oscillators 3 and 4 of
5 with 0 bolts 6. It can be tightened until it buckles by 0.1mm.

Lead wires 7 and 8 of the striding vibrator assembled in this way
When a voltage of 30 KHz and 20 volts was applied between them, the sliding connector 5 vibrated with an amplitude of 30 μm.

In this state, the sliding surface 5 of the sliding connector 5. Insert a flat rail 10 with a cross section of 5 mm x 2 dragons between the crimping element 9 and the
When the same signal as that applied to the piezoelectric vibrators 1 and 2 was applied to the crimping element 9, the crimping element operated in synchronization with the vibrator, and the rail lO began to move in the length direction.

When I changed the lead wires to the crimper and applied an opposite phase voltage, the rail 10 instantly changed direction and moved at the same speed 40.
It started moving in the opposite direction with cIrL/S. This embodiment shows an example in which a rail is used as a moving element and a near motor is used.

Example 3 Here, we will discuss an example of a motor that uses a spiral mode piezoelectric vibrator, which is a three-dimensional sliding vibrator, and which can be easily reversed. As shown in FIG. 4, the configuration uses a spiral mode vibrator as a driving source. The spiral mode vibrator and the torsional mode vibrator shown in Figure 1 have almost the same configuration, but while the torsional vibrator vibrates in two dimensions, the spiral vibrator vibrates in the direction of the bolt at the same time as weeping. This is taken into consideration. For this reason, the spiral oscillators 4 and 5 have a large torsional moment, and the oscillators 4 and 5 are made thick so that they resonate in the longitudinal direction at the same time, and the bolts are thin. Face 4. The sliding surface tcx + log of the rotor 10 was arranged so as to face tcx + log. A rotating shaft 11 vertically passes through the rotor 10, and a ball bearing is fixed inside the rotor 10, which is fitted into a bolted hole of the vibrator. The bolt of the vibrator is 15mm from the Nand tightening part on the opposite side.
It is a long, thin round bar that protrudes from the end face of the vibrator, and a ball bearing 12 for the moku branch is fixed thereto. A high frequency voltage of approximately 20 KHz and 30 volts is applied between the lead wires 8 and 9 to generate spiral mode vibration, and when the bolt is pushed toward the rotor from the bare IJ 7g I2 side, the 5th rotor 10 generates a large torque. When it turned clockwise and pulled the bolt in the opposite direction, the rotor 10 rotated in the opposite direction.

As explained above, since the sliding surface of the mover is crimped to the piezoelectric vibrator in the sliding mode, and the drive torque is obtained by sliding, the phase of the periodic crimping can be changed to the opposite phase. This has the effect of allowing the mover to move backwards.

The piezoelectric motor driven in this close mode is characterized by its relatively low speed rotation, high torque, accurate displacement, and ability to instantly reverse the direction of travel with almost no inertia. Unlike a motor, it is neither affected by magnetic force nor does it affect its surroundings, and it is also characterized by being considerably lighter than a magnetic motor. Note that the present invention is based on one type of sliding mode drive.
Since we have provided dimensional, two-dimensional, and three-dimensional piezoelectric motors,'
Terms such as ``movement'' and ``reversal'' are commonly used for these, and in a one-dimensional linear motor, running and reverse running are two-dimensional.
In dimensional torsion mode and three-dimensional spiral mode motors, it means rotation and reverse rotation, and the term "motor" refers to the rotor. It goes without saying that with linear motors, it is possible to run the motor and run on rails.

[Brief explanation of drawings]

FIG. 1 is a plan view of a torsion mode piezoelectric vibrator used in a torsion mode driven piezoelectric motor of the present invention, FIG. 2 is a partially cutaway view of the torsion mode driven piezoelectric motor of the present invention, and FIG. 3(a)
#(b) is a plan view and a side view of a piezoelectric motor driven in a sliding mode according to the present invention, and FIG. 4 is a partially cutaway explanatory view of a piezoelectric motor driven in a spiral mode according to the present invention. 1.2...Piezoelectric vibrator, 3,4,5...
・Torsion connector! 0...Rotor. Figure 1 Figure 2

Claims (1)

[Scope of Claims] (1) A piezoelectric motor driven in a sliding mode, characterized in that driving torque by sliding is obtained by crimping the sliding surface of a slider to a piezoelectric vibrator in a sliding mode. (2) The piezoelectric motor driven in a sliding mode according to claim (1) is characterized in that the disk surface of the mover and the disk surface of the connector are crimped in synchronization with the sliding vibration of the connector. (3) In the piezoelectric motor driven in a sliding mode according to claim (2), the phases of the crimping cycles between the mover and the connector are made to be in opposite phases. A piezoelectric motor driven in a sliding mode, characterized in that it can be rotated in reverse.