JPH11275837A - motor - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide a low-cost motor with high power generation accuracy. SOLUTION: A motor driving magnetized portion 51a and a frequency power generating magnetized portion 51b including a rotor and a stator arranged in a circumferential direction of the rotor, and the stator opposing the motor driving magnetized portion. And an armature core 72 arranged so as to be formed in a substantially annular shape on the circuit board of the stator so as to face the magnetized portion for frequency power generation, and formed on the circuit board of the stator. In the motor having the power generating coil pattern 61 in which the missing portion 61a for connecting the wiring pattern is formed, the angle formed between the center of the power generating coil pattern and the missing portion is the same as the number of energized phases. The angle is an integral multiple of the angle occupied by the armature core.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor used for driving a rotary magnetic head device of a video tape recorder or a spindle of a floppy disk drive.

[0002]

2. Description of the Related Art FIG. 6 is a sectional side view showing an example of a rotary magnetic head device provided with an example of a conventional motor. The rotating magnetic head device 100 includes a rotating drum 110, a fixed drum 120, a motor 130, and the like. The motor 130 has a stator 140 and a rotor 150, and the rotor 150 is formed integrally with a shaft 151, and the shaft 151 is formed integrally with the rotating drum 110.

In such a configuration, when the motor 130 is driven, the rotation of the rotor 150 is transmitted to the rotary drum 110 via the shaft 151.
0 rotates with respect to the fixed drum 120 and the rotating drum 11
The signal is recorded / reproduced on / from the magnetic tape by the 0 magnetic head 111.

FIG. 7 is a plan view showing an example of the stator 140 of the motor 130. The stator 140 includes a circuit board 160 on which a generator coil pattern 161 and a driving IC 162 for the motor 130 are disposed, and an armature core core assembly 170 having an armature core 172 around which a plurality of coils 171 are wound. Generating coil pattern 161
Is formed in a substantially annular shape along the circumferential direction of the circuit board 160 so that the armature core core assembly 170 is disposed in the inner region.

The stator 140 and the rotor 150
Are the armature iron core 172 and the power generation coil pattern 161
Is a motor drive in which N-poles and S-poles formed on the inner circumferential surface of the magnet 151 provided on the inner circumferential surface of the rotor 150 and the surface orthogonal to the magnet are alternately magnetized along the circumferential direction. Magnetizing section 151a for frequency generator and magnetizing section 151 for frequency generator
b. In such a configuration, when the rotor 150 rotates with respect to the stator 140 by energizing the coil 171, the N and S poles of the frequency generator magnetized portion 151 b cross the power generation coil pattern 161, so that power is generated. You can do it.

The armature core assembly 17
0 denotes a coil 171 disposed on the circuit board 160 because the coil 171 is disposed inside the power generation coil pattern 161.
It is necessary to connect the wiring pattern to the driving IC 162 so as to traverse the power generation coil pattern 161. Therefore, an arbitrary portion of the power generation coil pattern 161 is dropped, and the missing portion is connected to the driving IC 162 through the wiring pattern of the coil 171.

[0007]

In the above-described conventional motor 130, since an arbitrary portion of the power generation coil pattern 161 is missing, the voltage induced by the motor driving magnetized portion 151a and the magnetic field generated by the armature core 172 are reduced. There is a problem that the generated voltage waveform is deformed due to the disturbance, and the power generation accuracy is remarkably deteriorated.

Therefore, as shown in FIG. 8, the wire 161a in the radial direction of the power generation coil pattern 161 is left, and the wire 1
The wire between the wire 61a and the wire 161a is dropped, and the wiring pattern 171a of the coil 171 is passed through the dropped portion.
And the element wire 161a are electrically connected so that a missing portion does not occur. Further, the circuit board 160 has a two-phase structure, and the wiring pattern 171a of the coil 171 is provided.
In the lower layer of the power generation coil pattern 161.

By using the jumper wire 163 and the circuit board 160 having a two-phase structure as described above, an annular power generating coil pattern 161 having no missing portion can be formed, and the motor driving magnetized portion 151a is induced. The disturbance of the magnetic field due to the voltage and the armature core 172 is integrated and canceled. However, since the jumper wire 163 and the circuit board 160 having the two-phase structure are used, there is a problem that the cost is increased.

The present invention has been made to solve the above-mentioned problem, and has as its object to provide a low-cost motor with high power generation accuracy.

[0011]

According to the present invention, there is provided a motor driving magnetized portion and a frequency power generating magnetized magnet having a rotor and a stator, the magnets being arranged in the circumferential direction of the rotor, and the stator provided with the motor. An armature core arranged to face the driving magnetized portion, and a substantially annular shape is formed on the circuit board of the stator so as to face the frequency power generating magnetized portion. A motor having a power generating coil pattern formed with a missing portion for connecting a wiring pattern formed on a circuit board, wherein an angle between the center of the power generating coil pattern and the missing portion is
This is achieved by setting the angle to an integral multiple of the angle occupied by the armature cores corresponding to the number of energized phases.

According to the above configuration, the magnetic field generated by the magnetized portion for driving the motor and the armature core is occupied by the number of armature cores corresponding to the angle of one cycle and the number of energized phases of the magnetized portion for driving the motor. It changes at the cycle of the least common multiple of the angle. The effect of the magnetic field on the power generation coil pattern from the motor driving magnetized portion and the armature core is also canceled in this cycle. For this reason, the angle of the missing portion with respect to the entire power generation coil pattern is set to be the angle occupied by the number of armature cores corresponding to the number of energized phases of the motor or an angle that is an integral multiple of the angle, so that the motor drive ring The influence of the magnetic field created by the magnetic part and the armature core can be avoided.

[0013]

Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings. Note that the embodiments described below are preferred specific examples of the present invention,
Although various technically preferable limits are given, the scope of the present invention is not limited to these modes unless otherwise specified in the following description.

FIG. 1 is a sectional side view showing an example of a rotary magnetic head device provided with a preferred embodiment of the motor of the present invention. The rotary magnetic head device 1 includes a rotary drum 10, a fixed drum 20, a motor 30, and the like arranged coaxially.
The magnetic head 11 records a signal on the magnetic tape or reproduces a signal from the magnetic tape by the rotation of.

A flange 12 for fixing and supporting the shaft 51 is fixed to the inner peripheral portion of the rotary drum 10 by shrink fitting, for example. One or more magnetic heads 11 are fixed to the outer peripheral portion of the end face of the rotating drum 10. A rotor core 13 a of the rotary transformer 13 is fixed to an end face of the flange 12. On the inner peripheral portion of the fixed drum 20, a bearing 21 rotatably supporting the shaft 51,
21 is fitted. On the end face of the fixed drum 20,
The stator core 13b of the rotary transformer 13 is fixed so as to face the rotor core 13a. A lead portion (not shown) for guiding the lower end of the magnetic tape when the magnetic tape runs is formed on the outer peripheral surface of the fixed drum 20.

The rotor core 13 of the rotary transformer 13
a and a stator core 13b are provided with ring-shaped coils, respectively. For example, when the magnetic head 11 reproduces a signal from a magnetic tape, the coil of the rotor core 13a is arranged so that the reproduced signal can be transmitted in a non-contact manner. , Connected to the magnetic head 11, and the coil of the stator core 13b is
It is connected to an external signal processing unit, for example.

The motor 30 includes a stator 40 and a rotor 50
The stator 40 includes a circuit board 60, an armature core assembly 70, and the like, and the rotor 50 includes a magnet 51, a rotor yoke 52, and the like. The circuit board 60 is made of, for example, a metal substrate to play a role of a back yoke for forming a magnetic path. As shown in FIG. 2, the power generation coil pattern 61 and the drive of the motor 30 as shown in FIG. IC 62 and the like are provided. As shown in FIG. 3, the armature core assembly 70 includes an armature core 72 around which a coil 71 is wound.

The power generating coil pattern 61 is formed in a substantially annular shape along the circumferential direction of the circuit board 60 so that the armature core core assembly 70 is disposed in the inner region. Since the armature core core assembly 70 is disposed inside the power generation coil pattern 61, the wiring pattern of the coil 71 disposed on the circuit board 60 is
The driving IC 6
2 must be connected. Therefore, a part of the power generation coil pattern 61 is omitted, and the missing part 61a is connected to the driving IC 62 through the wiring pattern of the coil 71.

A plurality of magnets 51 are arranged over the entire inner peripheral surface of the rotor yoke 52. On the inner peripheral surface of the magnet 51 and a surface orthogonal thereto, a motor driving magnetized portion 51a and a frequency generator, which are multi-pole magnetized patterns in which N poles and S poles are alternately magnetized along the circumferential direction. Magnetized portions 51b are formed. The stator 40 and the rotor 50 have a motor driving magnetized portion 51a and a frequency generator magnetized in which the armature iron core 72 and the power generation coil pattern 61 are formed on the inner peripheral surface of the magnet 51 and a surface orthogonal thereto. It is combined so as to face the portion 51b. Note that the motor 30 of this example is a three-phase energized motor in which the motor driving magnetized portion 51a has 16 poles and the armature core 72 has 12 slots.

FIG. 4 is a schematic diagram showing the phase relationship among the power generation coil pattern 61, the frequency generator magnetized portion 51b, the motor drive magnetized portion 51a, and the armature core 72 in the motor 30 described above. The missing portion 61a of the power generating coil pattern 61 has an angle of the missing portion 61a with respect to the entire power generating coil pattern 61, the number of which is equal to the number of energized phases of the motor 30, that is, three phases of three phases of U phase, V phase, and W phase. It is formed so as to have an angle occupied by the armature core 72.

Motor-driven magnetized portion 51a and armature core 7
The magnetic field created by the motor-driven magnetizing section 51a
Armature core 72 with the angle of one cycle and the number of energized phases
It changes at the cycle of the least common multiple of the angle occupied by. And
The effect of the magnetic field on the power generating coil pattern 61 from the motor driving magnetized portion 51a and the armature core 72 is also canceled in this cycle. Therefore, by configuring the missing portion 61a as described above, the motor driving magnetized portion 51
a and the effect of the magnetic field created by the armature core 72 can be avoided.

FIG. 5 is a schematic diagram showing another phase relationship between the power generating coil pattern 61, the frequency generator magnetized portion 51b, the motor drive magnetized portion 51a, and the armature core 72. The missing portion 61aa in this case is the missing portion 61a shown in FIG.
Are formed continuously, whereas they are formed in a dispersed manner. That is, the angle of the missing portion 61a shown in FIG.
Assuming that B + C, missing portions corresponding to the angles A, B, and C are dispersedly formed. Even with such a configuration, it is possible to avoid the influence of the magnetic field created by the motor driving magnetized portion 51 a and the armature core 72. Note that the angle of the missing portions 61a, 61aa may be an angle that is an integral multiple of the angle occupied by the armature cores 72 in the number of energized phases of the motor 30.

Incidentally, the present invention is not limited to the above embodiment. The motor of the above-described embodiment is an example of a circumferentially opposed motor in which a rotor and a stator face each other and include an armature core core assembly. However, not limited to this,
The present invention is applicable to other types of motors. The motor according to the embodiment of the present invention is applied to a motor for rotating a rotary drum of a rotary magnetic head device of a video tape recorder. However, the present invention is not limited to this and can be applied to other fields.

[0024]

As described above, according to the present invention,
A motor with high power generation accuracy and low cost can be provided.

[Brief description of the drawings]

FIG. 1 is a sectional side view showing an example of a rotary magnetic head device provided with a preferred embodiment of a motor of the present invention.

FIG. 2 is a view showing an example of a power generation coil pattern and the like on a circuit board of the stator shown in FIG. 1;

FIG. 3 is a diagram showing an example of an armature core and the like on a circuit board of the stator shown in FIG. 1;

FIG. 4 is a schematic diagram showing a phase relationship among a power generation coil pattern, a frequency generator magnetized part, a motor drive magnetized part, and an armature core of the motor shown in FIG.

FIG. 5 is a schematic diagram showing another phase relationship among a power generation coil pattern, a frequency generator magnetized part, a motor drive magnetized part, and an armature core of the motor shown in FIG. 1;

FIG. 6 is a sectional side view showing an example of a rotary magnetic head device provided with an example of a conventional motor.

FIG. 7 is a plan view showing an example of a stator of the motor of the rotary magnetic head device shown in FIG. 6;

FIG. 8 is a diagram showing an example in which missing portions of an example of the power generation coil pattern of the stator shown in FIG. 5 are connected.

[Explanation of symbols]

1, 100 ... rotating magnetic head device, 30, 130
..Motors, 40, 140 ... stators, 50, 15
0: rotor, 51, 151: magnet, 51
a, 151a... frequency generating magnetized part, 51b, 15
1b: Motor-driven magnetized part, 60, 160: Circuit board, 61, 161: Power generation coil pattern, 61
a, 61aa: missing part, 70, 170: armature core assembly, 71, 171: coil, 7
2,172 ... armature core

Claims (2)

[Claims] 1. A motor driving magnetized part and a frequency power generating magnetized part comprising a rotor and a stator arranged in a circumferential direction of the rotor, and the stator opposing the motor driving magnetized part. And a wiring formed on the circuit board of the stator, in a substantially annular shape so as to face the magnetized portion for frequency power generation, and formed on the circuit board of the stator. A motor having a power generating coil pattern in which a missing portion for connecting a pattern is formed, wherein the angle between the center of the power generating coil pattern and the missing portion is equal to the number of energized phases. A motor whose angle is an integral multiple of the angle occupied by the motor. 2. The motor according to claim 1, wherein the missing portions are distributed.