JPH11146627A - Rocking motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rocking motor which allows special parts for supporting bearings to be omitted and enables the enhancement of bearing installation accuracy. SOLUTION: The rotor comprises a rotor shaft 11 and a rotor magnet 12 installed on the rotor shaft 11. Both ends of the rotor shaft 11 are supported by bearings 14, 15 so that the rotor shaft can freely rotate. The bearings 14, 15 are placed around the rotor magnet 12, and are housed in bearing housing portions 211, 212 formed at both ends of a stator core 17 around which drive coils 16a-16d are wound. By forming the bearing housing portions 211, 212 for housing the bearings 14, 15, respectively, at both ends of the stator core 17 in the direction of the length, as mentioned above, special parts for supporting the bearings 14, 15 can be omitted, and further bearing positioning can be enhanced.

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. 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, the drive coils 2 and 3 are each formed into an arc shape as shown in FIG. It is fixed to a stator core (fixing member). The drive coils 2 and 3 are arranged so as to face each other by shifting the position by 180 degrees as shown in FIG. 5, or three drive coils are arranged at intervals of 120 degrees. Both ends of the shaft 4 of the rotor 1 are rotatably supported by a pair of bearings (not shown). Each of the bearings has a structure other than the above-mentioned stator core, for example, a case (not shown) or a lid (see FIG. (Not shown). 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]

By the way, in the conventional oscillating motor having the above configuration, the shaft 4 of the rotor 1
Since the pair of bearings for supporting the bearings are arranged on a structure different from the stator core as described above, there is a problem that components for housing the bearings on the outer periphery of the stator core and above and below the stator core are required separately. In addition, since each bearing is housed in a different part, the mounting accuracy of the bearing generally deteriorates. As a result, there is a problem that the bearing is deteriorated, and the shaft tends to run out and tilt. Further, the conventional rocking motor has a problem in that the number of components increases, so that the cost required for materials and assembly increases.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a rocking motor in which a special part for supporting a bearing can be omitted and the mounting accuracy of the bearing can be improved.

[0006]

According to the present invention, there is provided a rotor having a magnet having at least two poles mounted on a rotor shaft, and rotatably supporting both ends of the rotor shaft. A pair of bearings 14 and 15, a stator core 17 disposed around a magnet and entirely made of a non-magnetic material, and mounted on the stator core 17,
And a pair of bearings 14, 15 formed integrally with at least two drive coils 16 a to 16 d for swinging the stator core 17 within a predetermined angle range and at both ends in the length direction of the stator core 17.
And bearing support means for respectively supporting the above. The bearing support means is formed integrally at both ends of the stator core 17 in the longitudinal direction and includes a pair of bearing storage portions 211 and 212 for storing the bearings 14 and 15 respectively. Further, when the bearing is accommodated in the bearing accommodating portion 211, a stopper for positioning the bearing 14 is provided in one of the bearing accommodating portion 211 and the bearing 14.

As described above, in the present invention, the bearing support means for integrally supporting both bearings for supporting both ends of the rotor shaft is provided at both ends in the longitudinal direction of the stator core. For this reason, in the present invention, a special part for supporting the bearing can be omitted, and the mounting accuracy of the bearing can be improved.

[0008]

Preferred embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a longitudinal sectional view of a swing motor according to this embodiment. FIG. 2 is a cross-sectional view taken along line AA of FIG. FIG. 3 is an exploded perspective view of the swing motor. As shown, the swing motor of this embodiment includes a rotor 13 having a rotor magnet 11 attached to a rotor shaft 11, a pair of bearings 14 and 15 rotatably supporting both ends of the rotor shaft 11, and a rotor. It is arranged around the magnet 12 to support the bearings 14 and 15 and to drive the drive coil 16.
A stator core 17 for winding windings a to 16d and a yoke 18 fitted on the outer periphery of the stator core 17 and made of a magnetic material as a whole are schematically constituted.

The rotor magnet 12 attached to the rotor shaft 11 comprises four magnets 12a to 12d, and when attached to the rotor shaft 11, forms a cylindrical body as a whole and has four poles in the radial direction. . As shown, the stator core 17 includes a hollow cylindrical portion 2 in which the rotor magnet 12 and the like are housed.
1 and a winding straight winding portion 22a which is arranged at 90 ° intervals in the circumferential direction of the outer peripheral surface of the hollow cylindrical portion 21 and extends in the radial direction.
To 22d. The stator core 17 is entirely made of a non-magnetic material (non-magnetic material) such as a synthetic resin.

[0010] As shown, the hollow cylindrical portion 21 is formed of a hollow cylinder, and both ends thereof are opened. Bearing housing portions 211 and 212 in which the bearings 14 and 15 are housed and fixed are formed on both end opening sides of the hollow cylindrical portion 21. The bearing housing portion 211 is formed such that the inner diameter of the upper portion of the hollow cylindrical portion 21 is larger than the inner diameter of the housing portion of the rotor magnet 12, so that a positioning step (stopper) 211a is generated. Similarly, the bearing housing 212 is formed such that the inner diameter of the lower portion of the hollow cylindrical portion 21 is formed larger than the inner diameter of the housing portion of the rotor magnet 12, and the step 21 for positioning is formed.
2a is generated.

With such a configuration, the bearing housing portion 211 is provided.
When assembling the bearing 14 therein, the bearing 14 is positioned by the step 211a, and after the assembling is completed, the bearing 14 is completely accommodated in the bearing accommodating portion 211 and is in a fixed state (fastened state). Similarly, when assembling the bearing 15 in the bearing housing portion 212, the bearing 15 is positioned by the step 212a, and after the assembly is completed, the bearing 15 is completely housed in the bearing housing portion 212 to be in a fixed state.

When the winding is wound around each of the winding portions 22a to 22d in the radial direction of each of the winding portions 22a to 22d, a direction perpendicular to the winding direction is provided. Arc-shaped protruding portion 2 that regulates the movement of the wire and facilitates straight winding
3 are provided. In the winding straight winding portions 22a to 22d of the stator core 17 configured as described above, one winding is continuously wound directly without being cut in the middle, and the drive coils 16a to 16d are wound. To form
It is suitable for improving workability. Each drive coil 16
One winding wound directly around a to 16d is wound in a predetermined direction so that the rotor 13 can swing within a predetermined angle range. In addition, the winding direct winding part 22a of the stator core 17
As described above, it is not necessary to continuously wind one winding continuously, and the windings to be directly wound around to 22d are separately wound around the winding straight winding portions 22a to 22d. You may do it. A magnetic sensor 24 for detecting the rotation angle of the rotor 13 is provided on the outer peripheral surface of the hollow cylindrical portion 21 of the stator core 17 and below the winding portion 22a, as shown in the figure.

Next, the operation of the embodiment having such a configuration will be described. The output signal of the magnetic sensor 24 becomes zero when the detection surface faces, for example, the boundary between the magnet 12a and the magnet 12d, and becomes positive, for example, when the detection surface faces the magnet 12a, and the detection surface faces the magnet 12b. When it becomes negative. For this reason, the positive and negative rotation angles of the rotor 13 can be known from the output signal of the magnetic sensor 24 about the boundary. Therefore,
By passing a current necessary for driving the rotor 13 through the drive coils 16a to 16d based on the output signal of the magnetic sensor 24, the rotor 13 is rotated, and the position of the rotor 13 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, the bearing housings 211, 2 for housing the bearings 14, 15 are provided.
12 are integrally provided at both ends in the length direction of the stator core 17. For this reason, the bearing 14,
The components for storing the components 15 are no longer necessary, and material costs and assembly costs can be reduced as compared with the related art. Further, in this embodiment, the bearing accommodating portions 211 and 212 for accommodating the bearings 14 and 15 are provided on the stator core 17, which is a single component, so that the mounting accuracy of the bearings 14 and 15 is improved and the rotor shaft 11 Swing and tilt can be reduced. Furthermore, in this embodiment, since the windings are wound directly around the winding winding portions 22a to 22d of the stator core 17 made of a non-magnetic material to form the drive coils 16a to 16d, the assembly time can be reduced. As a result, manufacturing costs can be reduced. Also,
In this embodiment, since the winding can be wound directly around the winding straight winding portions 22a to 22d of the stator core 17,
The winding direct winding portions are formed according to the number and shape of the driving coils 16a to 16d, and the winding direct winding portions 22a to 22d are formed.
It is only necessary to wind a winding directly around d. 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 to improve the torque performance.

Next, the bearings 14 and 15 are connected to the stator core 17.
Another example of support will be described with reference to FIG.
In this example, as shown in FIG. 4, the above-described bearing housing 211 is provided in the upper opening of the hollow cylindrical portion 21 of the stator core 17.
The bearing 1 is not formed in the upper opening of the hollow cylindrical portion 21.
4 is pushed in, and a flange 14 a as a stopper for positioning the bearing 14 when pushed in is inserted into the bearing 14.
Side. Note that the bearing 15 is also provided with a flange (not shown) similar to the flange 14 a of the bearing 14, and is pushed into the lower opening of the hollow cylindrical portion 21.

[0016]

As described above, according to the present invention,
Bearing support means for integrally supporting both bearings for supporting both ends of the rotor shaft are provided integrally with both ends in the length direction of the stator core. For this reason, in the present invention, a special part for supporting the bearing can be omitted, and the mounting accuracy of the bearing can be improved.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a configuration of an embodiment of the present invention.

FIG. 2 is a cross-sectional view taken along line AA of FIG.

FIG. 3 is an exploded perspective view of the embodiment of the present invention.

FIG. 4 is a view for explaining another example in which bearings 14 and 15 are supported by a stator core 17;

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

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Rotor shaft 12 Rotor magnet 13 Rotor 14, 15 Bearing 16a-16d Drive coil 17 Stator core 21 Hollow cylindrical part 22a-22d Winding winding part 211, 212 Bearing storage part 211a, 212b Step

Claims (3)

[Claims] 1. A rotor having a magnet having at least two poles attached to a rotor shaft, a pair of bearings rotatably supporting both ends of the rotor shaft, and a non-magnetic body disposed around the magnet. A stator core mounted on the stator core and configured to swing the rotor within a predetermined angle range; and a pair of bearings integrally formed on both ends of the stator core in a longitudinal direction. And a bearing supporting means for respectively supporting: 2. The bearing support means comprises a pair of bearing housings formed integrally at both ends in the length direction of the stator core and housing the pair of bearings respectively. The swing motor as described. 3. The bearing according to claim 2, wherein a stopper for positioning the bearing is provided in one of the bearing storage portion and the bearing when the bearing is stored in the bearing storage portion. Swing motor.