JP2008061377A - Motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem wherein the workability of winding is deteriorated and cost is increased since a stator core is integrally formed at a motor, in the conventional motor in which a rotor is formed of two rotors of an inner rotor and an outer rotor, and a winding is concentrically wound to a yoke of the stator core. <P>SOLUTION: Winding is easily applied to this motor by dividing the stator core, and the motor is improved in the accuracy of an air gap by molding a stator of resin. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a motor equipped with two rotors, an inner rotor and an outer rotor.

  FIG. 3 shows a conventional toroidal brushless motor, which includes a stator 10, an inner rotor 20, and an outer rotor 30.

  The stator 10 includes a stator yoke 14, an outer tooth 12 and an inner tooth 13 provided on the stator yoke 14, and the stator yoke 14 is provided with a three-phase coil 15. Usually, the coil 15 is star-connected or delta-connected.

The inner rotor 20 is rotatably held inside the stator 10 and includes a rotor yoke 21 and a permanent magnet 22. The outer rotor 30 is rotatably held outside the stator 10 and includes a rotor yoke 31 and a permanent magnet 32. The inner rotor 20 and the outer rotor 30 are rotated by a magnetic field generated by a current flowing through the coil 15. In FIG. 3, the stator core is integrally formed. (For example, see Patent Document 1)
JP 2001-37133 A

  According to the above prior art, since the stator core is integrally formed, the workability of the winding applied to the stator yoke is poor, which causes an increase in cost.

  For example, when winding, a method of winding the winding on a small bobbin and then winding the wound winding on a stator yoke portion has been taken.

  In order to solve the above problems, the present invention is characterized in that a stator core is formed of a core divided into a plurality of parts, and the stator core applied to the winding is molded with resin.

  By forming the stator core with a core divided into a plurality of parts, the stator yoke portion is not annular, and winding to the stator yoke can be easily performed, and the cost of the motor can be reduced.

  In addition, after assembling the stator core that has been divided and wound, the accuracy of the gap can be improved by molding and fixing with resin, and the noise of the motor can be reduced.

According to the first aspect of the present invention, there is provided a plurality of coils in which a toroidal winding is provided on the yoke of a stator core composed of a substantially annular yoke and a plurality of teeth provided on the yoke and connected in a three-phase star or delta shape. And a rotor that is rotatably held with respect to the stator, and the teeth have outer teeth projecting from the yoke in the outer circumferential direction, and the same number of outer teeth in the inner circumferential direction from the yoke. The rotor is composed of a protruding inner tooth, and the rotor is composed of an inner rotor facing the inner diameter side of the stator and an outer rotor facing the outer diameter side, at a position facing the teeth of the inner rotor and the outer rotor. In a motor in which a permanent magnet is arranged, a stator core is formed by a core divided into a plurality of parts. Ri, stator yoke portion is no longer circular, windings to the stator yoke can be easily subjected, it is possible to reduce cost of the motor.

  The invention according to claim 2 is a motor characterized in that the stator core divided and wound is assembled and fixed with resin, and the accuracy of the gap can be improved. Noise reduction is possible.

  According to a third aspect of the present invention, there is provided a motor in which a winding is applied to a stator tooth portion. By forming the stator core by a core divided into a plurality of parts, the stator yoke portion becomes non-circular, Winding can be performed easily, and the cost of the motor can be reduced. In addition, after assembling the stator core that has been divided and wound, the accuracy of the gap can be improved by molding and fixing with resin, and the noise of the motor can be reduced.

  The invention described in claim 4 is a motor having an axial through hole in the vicinity of the center intersecting with the teeth of the stator yoke, and is used as a resin through hole when the stator core is molded with resin. Thus, the resin mold structure can be simplified. In addition, the resin through-hole is comprised, without deteriorating the characteristic of a motor by making the said through-hole position into the center vicinity which cross | intersects the teeth of the stator yoke with a low magnetic flux of a stator core.

  Embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 shows an embodiment of a stator winding to which the present invention is applied. By dividing the stator core 11, the stator yoke 14 does not have an annular shape, and the winding 15 to the stator yoke 14 can be facilitated. Further, an axial through hole 16 is provided in the vicinity of the center intersecting with the outer teeth 12 and the inner teeth 13 of the stator yoke 14 and can be used as a resin through hole when resin molding is performed.

  FIG. 2 shows an embodiment of a motor in which the stator is molded from resin. As shown in FIG. 2, the resin 17 at one end of the stator core 10 is connected to the resin 18 at the other end through a through hole 16. With such a configuration, the gate 19 at the time of resin molding can be formed with only one end, and the mold structure can be simplified.

  The motor of the present invention is useful as a motor that requires low cost and low noise.

The partial front view which shows the stator of 1st Example of this invention (A) is a front view showing a partial internal structure of the motor, (b) is a sectional view thereof. Front view disclosing conventional motor stator structure

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Stator 11 Stator core 12 Outer teeth 13 Inner teeth 14 Yoke 15 Coil 16 Through hole 17 Resin at one end 18 Resin at the other end 19 Gate 20 Inner rotor 21 Inner rotor yoke 22 Inner permanent magnet 30 Outer rotor 31 Outer rotor yoke 32 Outer permanent magnet

Claims (4)

A stator having a plurality of coils connected to each other in a three-phase star or delta shape on the yoke of a stator core composed of a substantially annular yoke and a plurality of teeth provided on the yoke, and the stator The teeth are formed by outer teeth projecting from the yoke in the outer circumferential direction, and inner teeth projecting from the yoke in the inner circumferential direction by the same number as the outer teeth. In the motor in which a permanent magnet is arranged at a position facing the teeth of the inner rotor and the outer rotor, the inner rotor facing the inner diameter side of the stator and the outer rotor facing the outer diameter side. A motor having a stator core divided into a plurality of parts. A motor, wherein the stator core provided with the winding is molded of resin. The motor according to claim 1, wherein the winding is provided on a stator tooth portion. The motor according to claim 2, wherein an axial through hole is provided near a center of the yoke that intersects the teeth.

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