JPH0937530A - motor - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] To provide a small and highly efficient motor. A rotor 31 having a first magnetic material 311 and a magnet 313 on which a first uneven portion is formed.
And the second magnetic material 32 on which the second uneven portion is formed.
1, 322, 323, 331, 332, 333 and stators 32, 33 having coils 324, 334 wound around the second magnetic material, and the first uneven portion and the second uneven portion. The parts are arranged so as to face each other.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor structure, for example, a compact disc rom (C
D-ROM), mini disc (MD), floppy
The present invention relates to a disk rotating motor of a disk device in which a disk (FD) or the like is used.

[0002]

2. Description of the Related Art An optical disk device, which is an example of a disk device, is constructed as shown in FIG. Incidentally, FIG. 1A is a plan view showing the internal structure of the optical disc device,
FIG. 3B is a sectional view taken along the line AA. The optical disk device 1 includes a spindle motor 3 that drives a turntable 2 to rotate, and an optical pick-up 5 that irradiates an optical disk 4 mounted on the turntable 2 with, for example, a semiconductor laser beam. I have it. spindle·
The motor 3 is fixed to a mechanical deck 6 which is a support portion of the components of the optical disk device 1. As the spindle motor 3, for example, a brushless motor is used, and the turntable 2 is rotationally driven at a predetermined rotation speed under the control of a drive control circuit (not shown).

[0003]

The optical pick-up 5 of the above-mentioned optical disk device 1 records / reproduces or only reproduces a signal with respect to the optical disk 4, but the optical pick-up 5 can be located at the center of the optical disk 4. If it is configured to be movable as much as possible, the surface of the optical disc 4 can be effectively used and many signals can be recorded on the optical disc 4. However, in the center of the optical disc 4,
Since the spindle motor 3 is arranged, if the optical pick-up 5 is moved too much to the center of the optical disc 4, the optical pick-up 5 and the spindle motor 3 will interfere with each other.

In order to avoid such interference between the optical pick-up 5 and the spindle motor 3 and increase the moving distance of the optical pick-up 5, the spindle motor 3
The diameter of can be reduced. However, the spindle
Since the diameter of the motor 3 and the efficiency of the spindle motor 3 are in a proportional relationship, there is a problem that if the diameter of the spindle motor 3 is reduced, the efficiency of the spindle motor 3 also decreases. In particular, in an optical disk device using a CD-ROM, a recording method with a constant linear velocity is adopted, and therefore it is necessary to change the rotation speed of the spindle motor in a short time when performing a seek operation. It is necessary to increase the torque density of the spindle motor in order to cope with the higher speed of reproduction of 4 times speed, but a low-efficiency spindle motor with a small diameter cannot handle it.

As a motor that addresses such a problem, for example, there is a motor described in Japanese Patent Laid-Open No. 189932/1993. 9A and 9B are views showing the structure of this motor. FIG. 9A is a plan view of the motor, and FIG.
It is B sectional drawing. The motor 10 has a shape such that the distance from the center of the rotor 11 to the outer diameter of the stator 12 differs with respect to the angle, that is, the outer diameter of the stator 12 has a substantially semicircular shape.
A straight line is formed where the distance from the center of the rotor 11 to the outer diameter of the stator 12 differs with respect to the angle.

The rotor 11 comprises a permanent magnet 13 in which N poles and S poles are circumferentially arranged at substantially equal pitches, and a rotor yoke 14 constituting a magnetic circuit on the rotor 11 side. The stator 12 includes a case 15 and a stator core (magnetic pole core 16
A, stator yoke 16B, short-circuiting yoke 16C) 16,
It comprises a coil 17 wound around a magnetic pole core 16A, and rotatably supports the rotor 11 via a bearing 20. The stator core 16 has a magnetic pole core 16A having a coil 17 at a portion where the distance from the center of the rotor 11 to the outer diameter of the stator 12 is large, and faces the rotor 11 through a gap to form a back portion of the magnetic pole core 16A. Is the stator yoke 16B
Are magnetically coupled with. The portion where the distance from the center of the rotor 11 to the outer diameter of the stator 12 is small does not have the coil 17 and the magnetic pole iron core 16A, and the rotor 1 is provided through the gap.
The short-circuiting yoke 16C is arranged so as to cover the periphery of 1, and both ends of the short-circuiting yoke 16C are magnetically coupled to the stator yoke 16B. With such a configuration, it is possible to obtain a motor having a high torque density even if it is small, but there is a drawback that it is not sufficient in terms of motor efficiency.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a compact and highly efficient motor.

[0008]

According to the present invention, there is provided a rotor having a first magnetic material and a magnet on which a first uneven portion is formed, and a second uneven portion. A second magnetic material and a stator having a coil wound around the second magnetic material, and arranged so that the first uneven portion and the second uneven portion face each other. Achieved by

According to the above construction, since the coil can be arranged outside, the number of pole teeth can be increased as compared with the conventional one, and a small and highly efficient motor can be obtained.

[0010]

Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings. Although the embodiments described below are preferred specific examples of the present invention, various technically preferable limitations are given. However, the scope of the present invention is not limited to the following description. It is not limited to these forms unless otherwise stated.

FIG. 1 is a perspective view showing an embodiment of the motor of the present invention, and FIG. 2 is an exploded perspective view thereof. The motor 30 includes a rotor 31 and two stators 32 and 33.
And a connecting plate 34 for connecting the stators 32 and 33. The rotor 31 is a circular iron plate,
Two magnetic bodies 3 in which a plurality of magnetic materials such as silicon steel sheets are laminated
11 and 312, and a circular magnet 313. Concavities and convexities are formed as pole teeth at the same angular pitch on the outer peripheral surfaces of the magnetic bodies 311 and 312. A magnet 313 is sandwiched and fixed between these magnetic bodies 311 and 312.

The stators 32 and 33 have two magnetic bodies 321, 322 and 331, 332 in which a plurality of magnetic materials such as an iron plate and a silicon steel plate having a semicircular notch and a substantially rectangular notch are laminated. , Magnetic bodies 323 and 333 in which a plurality of magnetic materials such as a rugged iron plate and a silicon steel plate are laminated, and a coil 32 wound around the constricted portion of the magnetic bodies 323 and 333.
4 and 334. On the inner peripheral surfaces of the semicircular cutouts of the magnetic bodies 321, 322 and 331, 332, irregularities having the same angular pitch as the irregularities of the magnetic bodies 311 and 312 are formed as pole teeth. These magnetic bodies 321, 32
2 and 331, 332, the magnetic body 321, so that the coils 324 and 334 are arranged in the substantially rectangular notches.
Magnetic materials 323 and 33 are provided between 322 and 331 and 332.
The rib portion 3 is sandwiched, and is fixed by opening a gap into which a substantially rectangular coupling plate 34 can be inserted from a semicircular cutout portion. The semicircular cutouts of the two stators 32 and 33 are formed such that the two stators 32 and 33 are L-shaped when the cutouts are combined to form a circle, and the rotor 31 Is formed so as to surround the outer periphery of the with a constant gap.

When assembling the motor 30, first, the magnet 313 is sandwiched between the magnetic bodies 311 and 312, and the magnetic bodies 311 and 312 are fixed so that the irregularities have the same cycle, and the rotor 31 is fixed. Configure. The coils 324 and 334 are arranged in the substantially rectangular cutouts of the magnetic bodies 321, 322 and 331, 332, respectively.
The array portions of the magnetic bodies 323 and 333 are sandwiched between the 1, 322 and 331, 332 to form the magnetic bodies 321 and 331.
The magnetic flux entering from passes through the magnetic bodies 323 and 333 and is fixed so as to escape to the magnetic bodies 322 and 332.
And 33. Next, the stators 32 and 33 are inserted into the coupling plate 34 having a substantially rectangular shape, and one cycle of unevenness is set to 360.
When the angle is °, the unevenness between the stators 32 and 33 is 90 °.
It is fixed so that it has a phase difference of. And the rotor 31
Is a circular hole 34 provided in the substantially rectangular coupling plate 34.
1 and the uneven surface of the rotor 31 is fixed to the stators 32 and 33.
Hold so that it rotates while facing the uneven surface of.

An example of the operation of such a structure will be described with reference to the operation conceptual diagrams shown in FIGS. 3 to 6, the same components as those in FIG. 1 are designated by the same reference numerals. First, as shown in FIG. 3, the magnetic body 3 of the stator 32 is
21, 322 and magnetic members 311 and 31 of the rotor 31.
In the state where the convex portions of 2 are completely aligned and face each other, the convex portions of the magnetic bodies 331 and 332 of the stator 33 and the convex portions of the magnetic bodies 311 and 312 of the rotor 31 are deviated from each other, so that the stator 3
There are many air layers between the convex portions of the magnetic bodies 331 and 332 of No. 3 and the convex portions of the magnetic bodies 311 and 312 of the rotor 31, and it is difficult for the magnetic flux to flow.

Therefore, the magnetic flux emitted from the magnet 313 of the rotor 31 is the magnetic substance 311 to the stator 32 of the rotor 31.
Magnetic body 321 to stator 32 magnetic body 323 to stator 3
It passes through the second magnetic body 322 to the magnetic body 312 of the rotor 31 and returns to the magnet 313 of the rotor 31. At this time, the S pole is formed on the convex portion of the magnetic body 331 of the stator 33, and the stator 3
The stator 3 so that the N pole is formed on the convex portion of the magnetic body 332.
When a current is passed through the coil 334 of the magnetic body 333 of No. 3, the attraction force is generated between the convex portions of the magnetic bodies 331 and 332 of the stator 33 and the magnetic bodies 311 and 312 of the rotor 31, and FIG.
As shown in FIG. 5, the rotor 31 moves, and the convex portions of the magnetic bodies 331 and 332 of the stator 33 and the magnetic body 311 of the rotor 31,
The convex portions of 312 completely face each other and face each other.

In the state of FIG. 4, the magnetic body 33 of the stator 33 is
1, 332 and the magnetic members 311 and 312 of the rotor 31.
Of the magnetic bodies 321 and 322 of the stator 32 and the magnetic body 31 of the rotor 31.
Since the convex portions of Nos. 1 and 312 are displaced, the convex portions of the magnetic bodies 321 and 322 of the stator 32 and the magnetic body 311 of the rotor 31,
There are many air layers between the convex portions of 312, and it is difficult for magnetic flux to flow.
Therefore, the magnetic flux emitted from the magnet 313 of the rotor 31 is the magnetic substance 311 of the rotor 31 to the magnetic substance 3 of the stator 33.
31 to the magnetic body 333 of the stator 33 to the magnetic body 332 of the stator 33 to the magnetic body 312 of the rotor 31, and then returns to the magnet 313 of the rotor 31. At this time, when an electric current is applied to the coil 324 of the magnetic body 323 of the stator 32 so that the N pole is formed on the convex portion of the magnetic body 321 of the stator 32 and the S pole is formed on the convex portion of the magnetic body 322 of the stator 32, the fixation is performed. The protrusions of the magnetic bodies 321 and 322 of the child 32 and the magnetic body 31 of the rotor 31
A repulsive force is generated between the convex portions 1 and 312, and the rotor 31 moves as shown in FIG.

In the state of FIG. 5, the magnetic body 33 of the stator 33 is
1 has a north pole, and the magnetic body 332 of the stator 33 has an S pole.
The coil 3 of the magnetic body 333 of the stator 33 so that a pole is generated
When an electric current is applied to 34, magnetic members 331, 33 of the stator 33
A repulsive force is generated between the convex portion of 2 and the convex portions of the magnetic bodies 311 and 312 of the rotor 31, and the rotor 31 moves as shown in FIG. In the state of FIG. 6, the coil 324 of the magnetic body 323 of the stator 32 has an S pole on the convex portion of the magnetic body 321 of the stator 32 and an N pole on the convex portion of the magnetic body 332 of the stator 32.
When a current is applied to the rotor 32, an attractive force is generated between the convex portions of the magnetic bodies 321 and 322 of the stator 32 and the convex portions of the magnetic bodies 311 and 312 of the rotor 31, and the rotor 31 is rotated as shown in FIG. It moves and returns to the state of FIG.

Thus, the coil 324 of the magnetic body 323 of the stator 32 and the coil 3 of the magnetic body 333 of the stator 33 are as described above.
By alternately passing a current to 34, the rotor 31 can be moved, that is, rotated, in the same direction. The switching of the current is performed by using, for example, the counter electromotive voltage generated by the coil. In addition, the coil 324 is attached to the stator 32,
Since it is arranged outside the 33 and the rotor 31, the uneven pole teeth provided on the stators 32, 33 and the rotor 31 can have, for example, 24 poles, which is the same as a conventional 6-pole or 12-pole motor. High torque can be obtained even in size. In the above-described embodiment, the electric current is alternately applied to the two coils 324 and 334 in one direction. However, when one coil is generating an attractive force, the other coil is applied to the other coil 324 and 334. If a current is passed in the opposite direction to generate a repulsive force, a motor with higher torque can be obtained. Further, in the above-described embodiment, the stators 32, 3
Although 3 is L-shaped, that is, 90 ° with respect to the rotation center of the rotor 31, the same effect can be obtained even if it is within 180 ° with respect to the rotation center of the rotor 31. ..

FIG. 7 shows a case where the motor having such a structure is used in an optical disk device which is an example of the disk device. Incidentally, FIG. 9A is a plan view showing the internal structure of the optical disk device, and FIG. 9B is a sectional view taken along the line CC. The optical disk device 20 includes a motor 30 that drives the turn table 2 to rotate, and an optical pick-up 5 that irradiates the optical disk 4 mounted on the turn table 2 with, for example, a semiconductor laser beam. There is. Motor 30
Are fixed to the mechanical deck 6 which is a support portion of the components of the optical disk device 20. Then, the motor 30
The turntable 2 is rotationally driven at a predetermined rotational speed under the control of a drive control circuit (not shown).

The turntable 2 is rotatably supported on the mechanical deck 6. The turntable 2 has the optical disk 4 mounted on the surface thereof. The optical pick-up 5 is supported by the mechanical deck 6 so as to be movable in the radial direction of the optical disc 4. Then, the optical pick-up 5 is moved to an appropriate position in the radial direction by a feed motor (not shown), and a predetermined track on the signal recording surface of the lower surface of the optical disk 4 is irradiated with the semiconductor laser light, whereby the optical disk is picked up. The information signal recorded on the optical disc 4 is reproduced by recording the information signal on the optical disc 4 or detecting the return light from the signal recording surface.

The optical disk device 20 having the above structure
According to this, after the optical disk 4 is placed on the turntable 2 and fixedly held, the motor 30 is operated to turn the optical disk 4.
By rotating the table 2, the optical disk 4 is rotationally driven. In this state, the feed motor (not shown) is appropriately operated to move the optical pick-up 5 to an appropriate track position in the radial direction of the optical disc 4.
Here, when the motor 30 has the same efficiency as that of the conventional spindle motor, the motor 30 becomes smaller than the conventional spindle motor, so that the moving distance of the optical pick-up 5 is increased as compared with the conventional one. It is possible to bring it closer to the center of the optical disc 4. Then, by irradiating the lower surface of the optical disc 4 with a semiconductor laser beam, an information signal is recorded on the optical disc 4, or the information signal is reproduced by the return light from the signal recording surface of the optical disc 4. Thus, it is possible to record and reproduce a large amount of information on the same optical disc 4 as the conventional one, and it is possible to improve the performance of the disc device and effectively use the disc. .

[0022]

As described above, according to the present invention, it is possible to provide a small-sized and highly efficient motor.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a motor of the present invention.

FIG. 2 is an exploded perspective view of the embodiment of the motor of the present invention shown in FIG.

3 is a first operation schematic diagram of the embodiment of the motor of the present invention shown in FIG. 1. FIG.

FIG. 4 is a second operation schematic diagram of the embodiment of the motor of the present invention shown in FIG. 1.

5 is a third operation schematic diagram of the embodiment of the motor of the present invention shown in FIG. 1. FIG.

FIG. 6 is a fourth operation schematic diagram of the embodiment of the motor of the present invention shown in FIG. 1.

7A and 7B are a plan view and a CC cross-sectional view showing an example of an optical disk device using the embodiment of the motor according to the present invention shown in FIG.

FIG. 8 is a plan view and an AA cross-sectional view showing an example of an optical disc device using an example of a conventional motor.

FIG. 9 is a plan view showing another example of a conventional motor and B-
B sectional drawing.

[Explanation of Codes] 1, 20 Optical disk device 2 Turn table 3 Spindle motor 4 Optical disk 5 Optical pick up 6 Mechanical deck 10, 30 Motor 11, 31 Rotor 12, 32, 33 Stator 13 Permanent magnet 14 Rotation Child yoke 15 Case 16 Stator iron core 17, 324, 334 Coil 34 Coupling plate 311, 312, 321, 322, 323, 331, 3
32,333 magnetic material 313 magnet

Claims (2)

[Claims] 1. A rotor having a first magnetic material and a magnet on which a first uneven portion is formed, a second magnetic material and a second magnetic material on which a second uneven portion is formed. A motor having a stator having a coil wound around the motor, wherein the first concavo-convex portion and the second concavo-convex portion are arranged so as to face each other. 2. The motor according to claim 1, wherein the unevenness of the first uneven portion and the unevenness of the second uneven portion are formed at the same pitch and are arranged so that the phase relationship is different. .