JPH10290557A - Oscillatory motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an oscillatory motor satisfying the requirements of manufacturing cost reduction through increase of yield or shortening of manufacturing time, multipolar structure and flattening of a driving coil. SOLUTION: A rotor comprises a rotor shaft 17, and a rotor magnet 18 fixed thereto. A bobbin 20 comprising a nonmagnetic body is arranged around the magnet 18. The bobbin 20 comprises an annular part 201, and series winding parts 202a-202d. The series winding parts 202a-202d are applied with windings in series and driving coils 19a-19d for oscillating the rotor within a specified angular range are formed. More specifically, the driving coils 19a-19d are formed by applying windings in series to the series winding parts 202a-202d.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a swing motor capable of controlling the rotation angle of a rotor within a predetermined range.

[0002]

2. Description of the Related Art Conventionally, a rocking motor of this type is known as shown in FIG. The swing motor includes a rotatable rotor 1 and drive coils 2, 3 and the like, which are arranged around the rotor 1 with an air gap therebetween and swing the rotor 1 within a predetermined angle range. I have.
The rotor 1 includes a shaft 4 and two magnets 5 and 6 attached to the shaft 4, and both ends of the shaft 4 are rotatably supported by bearings (not shown). The drive coils 2 and 3 are arranged to face each other around the magnets 5 and 6 so that the magnetic flux is directed to the center of the rotor 1. Since the drive coils 2 and 3 are arranged along the circumferential direction of the outer peripheral surfaces of the magnets 5 and 6 having a cylindrical shape as a whole, they are each formed in an arc shape as shown in FIG. In addition to the case where the drive coils 2 and 3 are opposed to each other by shifting the position by 180 degrees as shown in FIG. 5, three drive coils are arranged at intervals of 120 degrees. As shown in FIG. 5, a magnetic sensor 7 is disposed inside the drive coil 2 to detect the positions of the magnets 5 and 6 (the rotation angle of the rotor 1). The magnetic sensor 7 is, for example, a Hall element that converts a magnetic flux into a voltage.

[0003] Next, the operation of the conventional rocking motor configured as described above will be described. Now, drive coils 2, 3
, A torque is generated in the magnets 5 and 6, and the rotor 1 rotates. When the current is stopped at a predetermined value, the rotor 1 stops, and when the drive coils 2 and 3 are connected in series or in parallel to supply an alternating current, the rotor 1 can swing less than 180 degrees. From the magnetic sensor 7, an output signal substantially proportional to the strength of the magnetic field can be obtained. Therefore, when the current of the drive coils 2 and 3 is adjusted so that the output signal from the magnetic sensor 7 has a predetermined value, the rotor 1 can be stopped at a desired position.

[0004]

The drive coils 2 and 3 are air-core coils and need to be formed (curved) in an arc shape in conformity with the outer peripheral surfaces of the cylindrical magnets 5 and 6. For this reason, stress is applied to the drive coils 2 and 3 and a layer short (short between windings) or disconnection is likely to occur, and the yield is low. There is such a disadvantage. The drive coils 2 and 3 formed of air-core winding coils are substantially elliptical, and are made by winding the coils around a rotating core. However, the coil winding speed differs between the long and short diameter portions. Therefore, it is difficult to make the drive coils 2 and 3. In particular, as shown in FIG. 5, when the drive coils 2 and 3 are composed of two coils, the longer diameter becomes larger than the shorter diameter and flattening occurs. It becomes even more difficult. Further, when the number of magnets of the rotor 1 is increased by increasing the number of poles, the number of drive coils increases in accordance with the increase of the number of poles. The cost will increase.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an oscillating motor capable of coping with a reduction in manufacturing cost due to an improvement in yield and a reduction in manufacturing time, as well as a multipolarization and a flattening of a drive coil.

[0006]

In order to achieve this object, the present invention provides a magnet 18 having at least two poles in a radial direction.
And a rotatable rotor 16 and at least two winding straight winding portions 202a to 202d radially extending from the periphery of the magnet 18 and arranged at predetermined intervals in the circumferential direction. A winding frame 20 formed of a body, and at least two drive coils 19a to 19d configured to directly wind a winding around each of the winding straight winding portions 202a to 202d and swing the rotor 16 within a predetermined angle range. I have. The plurality of drive coils 19a to 19d are formed by continuously winding a single winding around the plurality of winding direct winding portions 202a to 202d of the winding frame 20 to improve workability. It is suitable in such points. Each of the winding direct winding portions 202a to 202a
Reference numeral 202d connects one of the one end near the magnet 18 or the other end remote from the magnet 18 to an annular portion (201 or 231) formed in an annular shape. Also,
A circumferential protrusion (203 or 232) is provided on one of the one end and the other end that is not connected to the annular portion of each of the winding portions 202a to 201d.

As described above, according to the present invention, the driving coils 19a to 19d for swinging the rotor 16 within a predetermined angle range are provided.
Direct winding part 20 of winding frame 20 entirely made of non-magnetic material
The windings were wound directly around 2a to 202d. Therefore, according to the present invention, when manufacturing a rocking motor, it is possible to reduce the manufacturing cost by improving the yield and shortening the manufacturing time, and it is possible to cope with multi-polarization and flattening of the drive coil.

[0008]

Preferred embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a longitudinal section of a swing motor according to this embodiment. FIG. 2 is a sectional view taken along line AA of FIG. As shown in FIG. 1, the swing motor according to this embodiment has a cylindrical case 11 having upper and lower ends opened.
Each component described below is disposed in the case 11. An upper cover 12 is provided in upper and lower openings of the case 11.
And the lower lid 13 are fitted to each other to close the upper and lower openings of the case 11. A bearing 14 is attached to the center of the upper lid 12, and a bearing 15 is attached to the center of the lower lid 13. Further, both ends of the rotor shaft 17 of the rotor 16 are rotatably supported by the bearings 14 and 15.

The rotor 16 comprises a rotor shaft 17 and a rotor magnet 18 attached to the rotor shaft 17. The rotor magnet 18 has four magnets 18a to 18d.
Consists of The magnets 18a to 18d
When it is attached to, it forms a cylindrical body as a whole and is configured to have four poles in the radial direction. As shown in the figure, the drive coil 1 is provided around the magnet 18 with a predetermined gap.
A winding frame 20 for winding the windings 9a to 19d is arranged. The entire winding frame 20 is made of a non-magnetic material (non-magnetic material) such as a synthetic resin. As shown in FIG. 3, the winding frame 20 has an annular annular portion 201 disposed in the circumferential direction of the magnet 18 and 90 ° in the circumferential direction of the outer peripheral surface except for a part on the lower side of the annular portion 201. Winding straight winding portions 202a to 202 which are arranged at intervals and extend in the radial direction
d.

Each of the winding straight winding portions 202a to 202d has a radially extending distal end portion provided with a respective winding straight winding portion 202a to 202d.
When the winding is wound straight on 02d, a circumferential projection 203 is provided to regulate movement in a direction orthogonal to the winding direction of the winding and facilitate straight winding. The winding direct winding portions 202a to 202d of the winding frame 20 thus configured
It is preferable to form the drive coils 19a to 19d by continuously winding (winding) a winding made of a book without cutting in the middle in order to improve workability. One winding directly wound around each of the drive coils 19a to 19d is a rotor 1
6 is wound in a predetermined direction so that it can swing within a predetermined angle range. The winding direct winding portion 202 of the winding frame 20
As described above, it is not necessary to continuously wind a single winding continuously, and the windings to be wound directly around the windings a to 202d are formed by winding separate windings around the winding winding portions 202a to 202d. You may do it. Annular part 201 of reel 20
And below the winding portion 202a,
As shown in FIG. 1, a magnetic sensor 21 for detecting the rotation angle of the rotor 16 is provided.

Next, the operation of the embodiment having such a configuration will be described. The output signal of the magnetic sensor 21 becomes zero when the detection surface faces, for example, the boundary between the magnets 18a and 18d, and becomes positive when the detection surface faces the magnet 18a, for example, and the detection surface faces the magnet 18b. When it becomes negative. Therefore, the positive and negative rotation angles of the rotor 16 can be known from the output signal of the magnetic sensor 21 about the boundary. Therefore,
By passing a current necessary for driving the rotor 16 to the drive coils 19a to 19d based on the output signal of the magnetic sensor 21, the rotor 16 is rotated, and the position of the rotor 16 can be controlled according to the command signal. . These control sequences are performed by a control circuit (not shown).

As described above, in this embodiment,
A winding direct winding portion 202a of the winding frame 20 made of a non-magnetic material
Since the drive coils 19a to 19d are formed by winding windings around 202d, the conventional drive coil 2 shown in FIG.
It is not necessary to form the air-core winding coil in a curved shape as in 3. For this reason, short-circuiting between the windings, disconnection, and defective shape, which are problems in the conventional drive coils 2 and 3, can be prevented. In this embodiment, the drive coils 19a to 19d are formed by directly winding the windings on the winding direct winding portions 202a to 202d of the winding frame 20 made of a nonmagnetic material, so that the assembling time can be reduced. As a result, a reduction in manufacturing cost can be realized. Furthermore, in this embodiment, since the winding can be wound directly around the winding portions 202a to 202d of the winding frame 20, the winding portion is formed in accordance with the number and shape of the drive coils. It is only necessary to wind the winding directly around the winding portion. For this reason, it is possible to easily cope with the use of multiple coils (multiple poles) and the flattening of the drive coil, and also to improve the torque performance.

Next, a modified example of the winding frame 20 of this embodiment will be described with reference to FIG. As shown in FIG. 4, the winding frame 23 of this modified example has a winding straight winding portion 202a.
An annular portion 231 corresponding to the annular portion 201 shown in FIGS. 1 to 3 is provided on the side of the magnets 18a to 202d remote from the magnet 18, and the projecting portions A projection 232 corresponding to 203 is provided.

[0014]

As described above, according to the present invention,
The drive coil for swinging the rotor within a predetermined angle range is configured by winding a winding directly around a winding portion of a winding frame made of a non-magnetic material. For this reason, according to the present invention, the workability at the time of manufacturing is improved and the yield is also improved, so that the production cost can be reduced, and it is possible to easily cope with multi-polarization and flattening of the drive coil.

[Brief description of the drawings]

FIG. 1 is a longitudinal section showing a configuration of a main part of an embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG. 1;

FIG. 3 is a perspective view showing a relationship between a winding frame and a rotor.

FIG. 4 is a perspective view showing a modification of the winding frame.

FIG. 5 is a perspective view of a conventional device.

[Explanation of symbols]

 14, 15 Bearing 16 Rotor 17 Rotor shaft 18 Rotor magnet 18a to 18d Magnet 19a to 19d Drive coil 20, 23 Reel 21 Magnetic sensor 201, 231 Annular part 202a to 202d Direct winding part 203, 232 Projecting part

Claims (4)

[Claims] 1. A rotatable rotor having a magnet having at least two poles in a radial direction, and at least two windings extending radially from a periphery of the magnet and arranged at a predetermined interval in a circumferential direction. A winding frame having a wire-wound portion as a whole and made of a non-magnetic material; and a drive coil made up of at least two windings wound directly around the respective winding-wound portions and swinging the rotor within a predetermined angle range. An oscillating motor, comprising: 2. The plurality of drive coils are formed by continuously winding one winding around each of a plurality of winding direct winding portions of the winding frame. Rocking motor. 3. The method according to claim 1, wherein each of the series winding portions has one end connected to the magnet or the other end separated from the magnet connected to an annular portion formed in an annular shape. 3. The swing motor according to claim 1, wherein 4. The swing according to claim 3, wherein one of the one end side and the other end side of each of the winding portions which is not connected to the annular portion has a circumferential protrusion. Dynamic motor.