JPH10262361A - Oscillating motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an oscillating motor having a larger rotor torque by causing a drive coil 15 to utilize effectively magnetic fluxes generated by magnets. SOLUTION: A rotor 14 is constituted by fitting magnets 12, 13 with two poles in the radial direction, to a shaft 11 rotatably supported by bearings. A driving coil 15 for oscillating the rotor 14 in a range of a specified angle is arranged along the lengthwise direction of the peripheral surfaces of the magnets 12, 13, and along the upper and lower surfaces of the magnets 12, 13 as well. Consequently, the length of the part to which magnetic fluxes from the magnets 12, 13 act effectively in the whole of the driving coil 15 becomes longer than the length in the axial direction of the magnets 12, 13 as shown by the figure. Accordingly, it becomes possible to increase the torque of the rotor 14, since the driving coil 15 can effectively use magnetic fluxes generated by the magnets 12, 13.

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 mounted on 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. Magnets 5 and 6 having strong magnetic force are used in order to reduce the size of the oscillating motor. As shown in FIG. 6, a magnetic sensor 7 is arranged 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
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 and an alternating current is passed, the rotor 1 can swing 180 degrees. From the magnetic sensor 7, an output signal substantially proportional to the strength of the magnetic field can be obtained. Therefore, this magnetic sensor 7
The rotor 1 can be stopped at a desired position by adjusting the current of the drive coils 2 and 3 so that the output signal from the motor 1 becomes a predetermined value.

[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. Therefore, stress is applied to the drive coils 2 and 3 to easily cause a layer short (short between the windings) and disconnection, and there is a disadvantage that a yield is poor and a production cost is increased. The driving coils 2 and 3 are wound evenly and planarly as shown in FIG. 6, and the maximum length of the effective side length that contributes to the generation of torque by the magnetic flux from the magnet acting is Lc. The maximum length Lc is the axial length Lm of the magnets 5 and 6.
Shorter. For this reason, the drive coil 2,
3 cannot use the magnetic fluxes of the magnets 5 and 6 effectively,
In order to generate the necessary torque, the magnets 5 and 6 having a strong magnetic force are required, and this disadvantageously increases the cost.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an oscillating motor in which a magnetic flux generated by a magnet can be effectively used by a drive coil to improve the torque of a rotor.

[0006]

According to the present invention, there is provided a magnet having at least two poles in a radial direction.
2 and 13, a rotatable rotor 14 and a magnet 12,
13 at least along the length of the outer peripheral surface of the magnet 12,
13 and the magnets 12, 13
And a drive coil 15 for oscillating the rotor 4 within a predetermined angle range. In the present invention, the drive coil 15 is connected to the magnet 12,
13 and are arranged linearly along the length direction of the outer peripheral surface of the magnet 1.
Effective side 15a on which magnetic fluxes from 2, 13 effectively act;
An ineffective side 15b which is continuous with the effective side 15a and is linearly arranged along the upper and lower surfaces of the magnets 12, 13 and in which the magnetic flux from the magnets 12, 13 does not act effectively. Further, in the present invention, the outer peripheral surfaces of the magnets 12 and 13 and the magnet 1
Surround the upper and lower surfaces of 2, 13 with a winding frame 22 with a gap therebetween,
The drive coil 15 was formed by winding a winding around the winding frame 22.

As described above, according to the present invention, the drive coil 15
Are arranged along at least the upper and lower ends of the magnets along the length direction of the outer peripheral surfaces of the magnets 12 and 13, and the magnets 12 and
13 along the upper and lower surfaces. For this reason,
The length of the effective side 15 a of the drive coil 15 on which the magnetic flux from the magnets 12 and 13 acts is longer than the length of the magnets 12 and 13 in the axial direction. Therefore, the drive coil 15 is
2 and 13 can be used effectively and the rotor 14
Can be improved. Further, in the present invention, the drive coil 15 is linearly arranged along the length direction of the outer peripheral surfaces of the magnets 12 and 13, and the effective side 15 a where the magnetic flux from the magnets 12 and 13 effectively acts; 15a, and are arranged linearly along the upper and lower surfaces of the magnets 12 and 13 and the magnet 1
And the ineffective side 15b where the magnetic flux from 2 and 13 does not act effectively. For this reason, the invalid side 15 of the drive coil 15
Since b does not need to bend the drive coils 2 and 3 as in the related art, it can be made straight and shortest, and the shortened portion can be used as the effective side 15a. Therefore, for example, the magnets 12 and 13 are the same as the conventional one, and
When the same copper wire (winding) as that of the related art is used for the drive coil 15, the torque for rotating the rotor 14 is improved by about several tens of percent compared to the related art. Further, in the present invention, the drive coil 15 is configured by directly winding the winding around the winding frame 22. For this reason, in addition to improving the workability during manufacturing,
The yield is also improved, and as a result, production costs can be reduced.

[0008]

Preferred embodiments of the present invention will be described below with reference to the drawings. A schematic configuration of the swing motor according to this embodiment will be described with reference to FIGS. FIG. 1 is a perspective view showing a schematic configuration of a main part of this embodiment. FIG. 2 is an explanatory diagram illustrating a relationship between the drive coil and the magnet according to the embodiment. In this embodiment,
As shown in FIG. 1, a rotor 14 is constituted by a rotor shaft 11 rotatably supported by a bearing (not shown) and magnets 12 and 13 attached to the rotor shaft 11.
A drive coil 15 for swinging the rotor 14 within a predetermined angle range is arranged around the circumferences 2 and 13 as shown in the figure.

As shown in FIG. 1, the drive coil 15 extends along the axial direction of the outer peripheral surfaces of the magnets 12 and 13 and the magnet 1
One winding is wound a plurality of times in the direction along the upper and lower surfaces of 2, 13 to form a rectangular shape as a whole. More specifically, the drive coil 15 is, as shown in FIG.
An effective side 15 which is linearly arranged along the axial direction of the outer peripheral surfaces of the magnets 2 and 13 and on which magnetic flux from the magnets 12 and 13 effectively acts.
a and the magnets 12, 13
And the ineffective side 15b in which the magnetic flux from the magnets 12 and 13 does not act effectively. The length La of the effective side 15a of the drive coil 15 is longer than the length Lm of the magnets 12 and 13, and preferably, the length La is slightly longer than the length Lm of the magnets 12 and 13, and The length Lb of the invalid side 15b is made linear as described above to make it the shortest. With such a configuration, the ineffective side 15b of the drive coil 15 can be minimized because the drive coils 2 and 3 do not need to be curved as in the related art, and waste can be omitted. 15a can be used. For this reason, for example, the magnet 1
2 and 13 are the same as the conventional one, and when the same copper wire (winding) as the conventional is used for the drive coil 15, the rotor 1
4 is improved by several tens of percent as compared with the related art.

Next, a detailed configuration of this embodiment will be described with reference to FIGS. FIG. 3 is a detailed vertical sectional view of the swing motor according to the embodiment of the present invention. FIG. 4 is a sectional view taken along line AA of FIG. FIG.
It is a perspective view which shows the schematic structure of the principal part of a rocking motor, and a case etc. are omitted. As shown in FIG. 3, the oscillating motor of this embodiment has a cylindrical case 17 having upper and lower ends open, and in this case 17, components described later are arranged. An upper lid 18 and a lower lid 19 are fitted into upper and lower openings of the case 17, respectively, so as to close the upper and lower openings of the case 17. Top lid 18
A bearing 20 is attached to the center of the lower cover 19, and a bearing 21 is attached to the center of the lower lid 19. Further, both ends of the rotor shaft 11 of the rotor 14 are rotatably supported by the bearings 20 and 21.

The rotor 14 comprises a rotor shaft 11 and two magnets 12 and 13 attached to the rotor shaft 11. The magnet 12 and the magnet 13 are each formed of a semi-cylindrical body having a predetermined thickness, and are configured such that when mounted on the rotor shaft 11, both the magnets 12 and 13 become cylindrical bodies (FIG. 1). reference). The outer peripheral surface of the magnet 12 is an N pole, and the outer peripheral surface of the magnet 13 is an S pole. Magnet 1
As shown in FIG. 3, the entire periphery of each of the windings 2 and 13 is separated from the winding frame 2 for winding the winding of the drive coil 15 with a predetermined gap.
It is surrounded by two. The winding frame 22 is entirely made of a nonmagnetic material such as a synthetic resin, and has a hollow cylindrical portion 2 for winding the winding of the driving coil 15 as shown in FIG.
21, and projecting portions 222 and 223 are provided so as to protrude at positions opposed to each other in the circumferential direction of the hollow cylindrical portion 221, and the whole is configured in an H shape.

[0012] As shown in FIG.
The magnets 12 and 13 are formed so as to surround the outer peripheral surfaces and upper and lower surfaces of the magnets with a predetermined gap therebetween, and as a whole are formed of a hollow cylindrical body as shown in FIG. The upper part of the hollow cylindrical part 221 is opened, and the upper part of the opening is
Is blocked by The upper lid 224 is attached to the rotor shaft 11
Is formed from a cylindrical portion through which the tube is inserted, and an annular portion integrated with the lower end of the cylindrical portion. A member having the same shape as the upper lid 224 is integrally attached to the lower opening of the hollow cylindrical portion 221. The protruding portion 222 is attached in the longitudinal direction of the hollow cylindrical portion 221 so that the outer peripheral surface thereof is in contact with the inner peripheral surface of the case 17. The upper and lower ends of the protruding portion 222 project vertically from the upper and lower ends of the hollow cylindrical portion 221, and are positioned by the upper and lower lids 18 and 19. The protruding part 223 is a hollow cylindrical part 221.
The outer peripheral surface of the case 17 is configured to be in contact with the inner peripheral surface of the case 17. The upper and lower ends of the protruding portion 223 protrude vertically from the upper and lower ends of the hollow cylindrical portion 221, and the upper and lower lids 1.
Positions 8 and 19 are used. As shown in FIGS. 3 and 4, the drive coil 15 is provided on the surface of the hollow cylindrical portion 221 of the winding frame 22 having such a configuration.
Are wound directly.

On the lower side of the rotor shaft 11, magnets 12 and 13 of the rotor 14 are provided to detect the rotation angle of the rotor 14.
Separately from this, detection magnets 23 and 24 each having two poles in the radial direction are attached as shown in FIG. As shown in FIGS. 3 and 4, a magnetic sensor 25 is provided at a position facing the peripheral surfaces of the detection magnets 23 and 24. The magnetic sensor 25 is provided with a protrusion 223 of the winding frame 22.
It is fixed to the notched plane. According to such a configuration, when the magnetic sensor 25 detects the rotation angle of the rotor 14, the magnetic sensor 25 is not affected by the magnetic field generated by the current flowing through the drive coil 15. Can be detected with high accuracy.

Next, the operation of the embodiment having such a configuration will be described. The output signal of the magnetic sensor 25 becomes zero when the detection surface faces the boundary between the detection magnet 23 and the detection magnet 24, and becomes positive when the detection surface faces the detection magnet 23, for example. Becomes negative when it faces the detection magnet 24. For this reason, the positive and negative rotation angles of the rotor 14 can be known from the output signal of the magnetic sensor 25 around the boundary. Therefore, based on the output signal of the magnetic sensor 25,
By supplying a current necessary for driving the rotor 14 to the drive coil 15, the rotor 14 is rotated, and the position of the rotor 14 can be controlled according to a command signal. These control sequences are performed by a control circuit (not shown).

By the way, the drive coil 15 is
As shown in FIG. 2, the length La of the effective side 15a contributing to the generation of torque of the rotor 14 is made linear and the length L of the magnets 12 and 13 is reduced.
m, and the ineffective side 15b that does not contribute to the torque generation of the rotor 14 is linear. For this reason, the ineffective side 15b of the drive coil 15 does not need to bend the drive coils 2 and 3 as in the related art, so that it can be shortened by making it straight and the waste can be omitted. Can be used as side 15a. Thus, for example, magnet 1
2 and 13 are the same as the conventional one, and when the same copper wire (winding) as the conventional is used for the drive coil 15, the rotor 1
4 is improved by several tens of percent as compared with the related art. Further, in this embodiment, since the winding of the drive coil 15 is wound directly around the hollow cylindrical portion 221 of the winding frame 22, the workability during manufacturing is improved, and the yield is also improved. As a result, production costs can be reduced.

[0016]

As described above, according to the present invention,
The drive coil is arranged along at least the upper and lower ends of the magnet along the length direction of the outer peripheral surface of the magnet, and is arranged along the upper and lower surfaces of the magnet. For this reason, in the present invention, the drive coil can effectively use the magnetic flux generated by the magnet, so that the torque of the rotor can be improved. Further, in the present invention, the drive coil is linearly arranged along the longitudinal direction of the outer peripheral surface of the magnet, and the effective side where the magnetic flux from the magnet acts effectively, and the effective side is continuous with the effective side and is located above the magnet. It is arranged in a straight line along the lower surface and is constituted by an ineffective side on which the magnetic flux from the magnet does not act effectively. For this reason, the ineffective side of the drive coil can be linearly minimized because the drive coil does not need to be curved unlike the conventional case, and the shortened portion can be used as the effective side, so that the torque for rotating the rotor can be reduced. Is greatly improved as compared with the prior art. Further, in the present invention, the drive coil is formed by directly winding the winding around the winding frame, so that not only the workability at the time of manufacturing is improved, but also the yield is improved, and as a result, the production cost is reduced. Can be achieved.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a schematic configuration of a main part of an embodiment of the present invention.

FIG. 2 is an explanatory diagram illustrating a relationship between a drive coil and a magnet according to the embodiment.

FIG. 3 is a detailed longitudinal sectional view of the embodiment of the present invention.

FIG. 4 is a sectional view taken along line AA of FIG. 3;

FIG. 5 is a perspective view showing a schematic configuration of a main part of the embodiment, in which a case and the like are omitted.

FIG. 6 is a perspective view of a conventional device.

FIG. 7 is an explanatory diagram illustrating a relationship between a drive coil and a magnet of the device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Rotor shaft 12, 13 Magnet 14 Rotor 15 Drive coil 15a Effective side 15b Invalid side 22 Reel 221 Hollow cylindrical part 222, 223 Projection

Claims (3)

[Claims] A rotatable rotor having a magnet having at least two poles in a radial direction, and disposed at least to upper and lower ends of the magnet along a length direction of an outer peripheral surface of the magnet; And a drive coil disposed along upper and lower surfaces of the magnet to swing the rotor within a range of a predetermined angle. 2. The drive coil is disposed linearly along a length direction of an outer peripheral surface of the magnet, an effective side where a magnetic flux from the magnet acts effectively, and the drive coil is continuous with the effective side, and 2. The rocking motor according to claim 1, wherein the rocking motor is configured to be linearly arranged along the upper and lower surfaces of the magnet, and to have an ineffective side on which the magnetic flux from the magnet does not act effectively. 3. An outer peripheral surface of the magnet and upper and lower surfaces of the magnet are surrounded by a winding frame with a gap therebetween, and a winding is wound around the winding frame to constitute the drive coil. The swing motor according to claim 1.