JP2017208973A - Coreless motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance the rigidity of a rotor coil and obtain smooth rotation, even in a coreless motor that can rotate at a high speed.SOLUTION: A coreless motor 1 comprises: a rotation shaft 10; a rotation plate 11 attached to the rotation shaft 10; and a cylindrical rotor coil 12 whose one end side is cantilevered by the rotation plate 11. The rotor coil 12 comprises: a coil winding 12A; and a dummy winding 12B not energized at energization to the coil winding 12A.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a coreless motor.

  A coreless motor has no core (iron core) in its rotating body, has a small moment of inertia and high responsiveness, has a small inductance in the winding part, and suppresses sparks generated during rectification, thereby reducing brush wear and reducing the motor. It is generally known that it has advantages such as long life, no cogging torque, and smooth rotation.

  The coreless motor includes a case (yoke) that cantilever-supports a cylindrical rotor coil on a rotating shaft via a rotating plate to form a rotor (armature), covers the rotor, and supports the rotating shaft. ing. In the inner rotor type, a magnet is fixed to a case (yoke) covering the rotor, and in the outer rotor type, a magnet is fixed to a bearing housing of the rotary shaft to constitute a stator. The rotating plate attached to the rotating shaft is provided with a commutator to which a rotor coil terminal is connected, and the commutator on the rotor side and the feeder wire (lead wire) on the stator side are electrically connected via a brush. They are connected (for example, refer to Patent Document 1 below).

Japanese Patent Laid-Open No. 5-30721

  The rotor coil of the coreless motor is formed into a cylindrical shape by flat press-molding a coil winding wound with hexagonal winding or the like and hardening it with resin or the like. At this time, a plurality of coil segments wound by a predetermined number of turns are formed, the plurality of coil segments are fixed so that the straight portions are arranged in parallel, and each coil segment is formed by delta connection or the like. To pull out the terminal part.

  Such a coreless motor has the property that the unloaded rotational speed of the motor decreases as the number of windings of the rotor coil increases. For this reason, in order to enable high-speed rotation with a coreless motor, it is necessary to reduce the number of windings of the rotor coil. However, the rigidity of the rotor coil depends on the density of the winding. If the winding density is reduced by reducing the number of windings of the rotor coil, the rigidity of the rotor coil will be reduced. When the rotor is rotated at a high speed, the free end side of the rotor coil whose one end is cantilevered by the rotating plate is easily deformed by centrifugal force. As a result, the coreless motor that enables high-speed rotation by reducing the number of windings has a problem that the free end side of the rotor coil easily comes into contact with the case disposed outside the rotor coil, resulting in smooth high-speed rotation. There was a problem that could not be obtained.

  In order to cope with such problems, an object of the present invention is to increase the rigidity of a rotor coil even in a coreless motor capable of high-speed rotation so that smooth high-speed rotation can be obtained.

  In order to solve such a problem, the coreless motor according to the present invention has the following configuration.

  A coreless motor comprising a rotating shaft, a rotating plate attached to the rotating shaft, and a cylindrical rotor coil whose one end is cantilevered by the rotating plate, the rotor coil comprising: a coil winding; A coreless motor comprising a dummy winding that is not energized when the coil winding is energized.

It is sectional drawing which showed the structural example of the coreless motor. It is explanatory drawing which showed the rotor coil (state of flat press molding) of the coreless motor which concerns on embodiment of this invention. It is explanatory drawing which showed the cross section of the rotor coil of the coreless motor which concerns on embodiment of this invention ((a) is the example by which the dummy winding was wound by the space | interval of a coil winding, (b) is a coil winding. Example of laminated and wound with a dummy winding).

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. As shown in FIG. 1, the coreless motor 1 includes a rotating shaft (output shaft) 10, a rotating plate 11, and a rotor coil 12 as a rotor (armature) 1A. A rotating shaft 10 is attached to the center of the rotating plate 11, and one end of a cylindrical rotor coil 12 is cantilevered on the rotating plate 11.

  The coreless motor 1 also includes, as the stator 1B, a cover 20 that covers the rotor 1A, a bearing housing 22 that holds a bearing 21 that supports the rotating shaft 10, a magnet 23 that is fixed to the bearing housing 22, and the like. . One end of the cover 20 is attached to the bearing housing 22, and a rear cover 24 is attached to the other end. The cover 20 and the bearing housing 22 function as a yoke for the magnet 23, and the rotor coil 12 is disposed in the air gap between the magnet 23 and the cover 20.

  A terminal 12S of the rotor coil 12 is connected to a commutator 13 provided on the rotating plate 11, and the commutator 13 is connected to a lead wire 26 on the stator 1B side via a brush 25.

  As in the prior art, the rotor coil 12 is formed by flat press forming a coil winding wound by hexagonal winding or the like, and forming it into a cylindrical shape. FIG. 2 shows a state where the rotor coil 12 is flat press-molded. The rotor coil 12 of the coreless motor 1 according to the embodiment of the present invention includes a coil winding 12A that is energized with a drive current and a dummy winding 12B that is not energized when the coil winding 12A is energized.

  The dummy winding 12B can be wound in parallel with the winding of the coil winding 12A by using a winding jig of the coil winding 12A. Further, the dummy winding 12B can be wound after the coil winding 12A is wound or before the winding is wound by using a common winding jig.

  The dummy winding 12B is not energized when the coil winding 12A is energized by using the same conductive wire (for example, copper) as the coil winding 12A and not connecting the coil winding 12A or the commutator 13. Alternatively, a nonmagnetic conductive wire different from the coil winding 12A may be used. The dummy winding 12B may be made of a non-conductor (for example, nonmagnetic chemical fiber such as aluminum, nylon, polyimide, etc.).

  FIG. 3 shows a cross section of the rotor coil 12. The dummy winding 12B may be arranged so as to be wound between the pitches of the coil winding 12A as shown in FIG. 3A, or the coil winding 12A as shown in FIG. 3B. It may be arranged so as to be laminated and wound.

  The coreless motor 1 according to the embodiment of the present invention is a case where the rotor coil 12 includes the dummy winding 12B as described above, thereby enabling high-speed rotation by reducing the number of turns of the coil winding 12A. However, the rigidity of the rotor coil 12 can be increased by the winding density of the coil winding 12A and the dummy winding 12B, and the rotor coil 12 can be prevented from being deformed by centrifugal force during high-speed rotation. it can. As a result, the coreless motor 1 according to the embodiment of the present invention can realize a motor that enables smooth high-speed rotation without causing problems such as the rotor coil 12 contacting the inner surface of the cover 20. .

  As described above, the embodiments of the present invention have been described in detail with reference to the drawings. However, the specific configuration is not limited to these embodiments, and the design can be changed without departing from the scope of the present invention. Is included in the present invention. In addition, the above-described embodiments can be combined by utilizing each other's technology as long as there is no particular contradiction or problem in the purpose and configuration.

1: Coreless motor, 1A: Rotor (armature), 1B: Stator,
10: Rotating shaft (output shaft), 11: Rotating plate, 12: Rotor coil, 12S: Terminal,
12A: coil winding, 12B: dummy winding, 13: commutator,
20: Cover, 21: Bearing, 22: Bearing housing, 23: Magnet,
24: Rear cover, 25: Brush, 26: Lead wire

Claims (3)

A coreless motor comprising a rotating shaft, a rotating plate attached to the rotating shaft, and a cylindrical rotor coil whose one end is cantilevered by the rotating plate;
The coreless motor, wherein the rotor coil includes a coil winding and a dummy winding that is not energized when the coil winding is energized.   2. The coreless motor according to claim 1, wherein the dummy winding is wound between pitches of the coil windings.   The coreless motor according to claim 1, wherein the dummy winding is wound around the coil winding.

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