JP2005304101A - Stator supporting structure of rotary electric machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide the stator supporting structure of a rotary electric machine in which air gap management accuracy between a rotor and a stator can be enhanced in the axial direction. <P>SOLUTION: In the stator supporting structure of an axial gap type rotary electric machine 1 where at least one pair of stators 4-1 and 4-2 and a rotor 3 are arranged oppositely along a rotary shaft 2 in a housing 5, the stators 4-1 and 4-2 are supported such that the inner circumferential side end can rotate about the rotary shaft 2 of the rotor 3, and means 23-1 and 23-2 for positioning the stators 4-1 and 4-2 in the axial direction and supporting an axial force acting on the stator are provided on the rotary shaft 2 of the rotor 3. Furthermore, outer circumferential side ends of the stators 4-1 and 4-2 are supported on the housing 5 movably in the axial direction but unmovably in the circumferential direction. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a stator support structure for an axial gap type rotating electrical machine in which at least a pair of a stator and a rotor are arranged to face each other along a rotation axis in a housing.

2. Description of the Related Art Conventionally, axial gap type rotating electrical machines in which at least a pair of stators and a rotor are disposed so as to face each other along a rotation axis in a housing are known in various configurations (see, for example, Patent Document 1). .
JP 2003-88032 A

  In the conventional axial gap type rotating electrical machine described above, when supporting the stator, the outer peripheral side end of the stator is supported in a bracket provided in the housing in contact with the peripheral wall of the housing, so that the stator is interposed via the bracket. It was supported by the housing. Further, the inner peripheral end of the stator is not in contact with the rotor rotation shaft, and there is a space between the stator inner peripheral end and the rotor rotation shaft.

  In the conventional axial gap type rotating electrical machine having the above-described configuration, it is important to keep the air gap in the axial direction between the rotor and the stator constant. However, since the rotor and the stator are connected via a plurality of components, the rotor and the stator are particularly connected via an aluminum housing having a larger linear expansion coefficient than those of the other components. Are connected to each other, and therefore, there is a problem that it is difficult to improve the accuracy of air gap management between the rotor and the stator in the axial direction.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a stator support structure for a rotating electrical machine that can solve the above-described problems and improve the accuracy of air gap management between the rotor and the stator in the axial direction.

  A stator support structure for a rotating electrical machine according to the present invention is a stator support structure for an axial gap type rotating electrical machine in which at least a pair of stators and a rotor are arranged in a housing so as to face each other along a rotation axis. On the other hand, positioning means for rotatably supporting the inner peripheral end of the stator and positioning the stator in the axial direction and supporting the axial force acting on the stator is provided on the rotating shaft of the rotor. The outer peripheral side end of the stator is supported so as to be movable in the axial direction and not to move in the circumferential direction.

  According to the stator supporting structure for a rotating electrical machine of the present invention, the inner peripheral side end of the stator is rotatably supported with respect to the rotating shaft of the rotor, and the axial force acting on the stator is supported while positioning the stator in the axial direction. Since the positioning means is provided on the rotating shaft of the rotor, and the outer peripheral side end of the stator is supported with respect to the housing so as to be movable in the axial direction and not to move in the circumferential direction. Both the rotor and stator have a structure in which the axial direction position is regulated by the rotor's rotation shaft, and there are few stacked parts and a structure that does not involve an aluminum housing with a significantly different linear expansion coefficient. The air gap management accuracy between them is dramatically improved.

  In addition, since the positioning means is provided on the rotor rotation shaft, the axial torque reaction force acting on the rotor side and the axial torque reaction force acting on the stator side are balanced on the rotor rotation shaft. The axial direction force does not act on the rotor rotation shaft itself, and the support structure for the axial direction force of the rotor rotation shaft can be simplified.

  As a preferred example of the stator support structure for a rotating electrical machine according to the present invention, an axial direction defining portion is provided on the rotating shaft between the rotor and the stator, and the dimension between the rotor and the stator is regulated by the axial direction defining portion. can do. According to this configuration, even when the disk-shaped rotor having the magnet therein is attracted to the stator side by the magnetic force, the axial direction defining portion provided on the rotor rotation shaft minimizes the minimum. Since the axial gap is secured, the magnet and the stator are not attracted due to a shim selection error during assembly, and workability is improved.

  As a preferred example of the stator support structure for a rotating electrical machine according to the present invention, the positioning means can be formed of a member that can be elastically deformed in the axial direction by an axial force. If comprised in this way, the difference of the elongation between the rotating shaft of a rotor and the inner peripheral side edge part of a stator can be absorbed.

  Furthermore, as a preferred example of the stator support structure for a rotating electrical machine according to the present invention, when supporting the rotating shaft of the rotor at both ends of the case via bearings, one of the two bearings at both ends is subjected to axial force. Thus, it can be configured to be supported so as to be movable in the axial direction. If comprised in this way, the difference of the elongation between the rotating shaft of a rotor and a housing can be absorbed.

Embodiments of the present invention will be described below in detail with reference to the drawings.
FIG. 1 is a view for explaining an example of a stator support structure for a rotating electrical machine according to the present invention. In the example shown in FIG. 1, a rotor shaft 2 serving as a rotation shaft, a disk-shaped rotor 3 fixed to the rotor shaft 2, and two stators 4-1 and 4-2 provided to face the rotor 3. Is housed in the housing 5 to constitute the axial gap type rotating electrical machine 1. In this example, the rotor shaft 2 is rotatably mounted on the housing 5 via bearings 6-1, 6-2. The rotor 3 includes a rotor yoke 7 and magnets 8-1 and 8-2 provided on both sides of the rotor yoke 7. Further, the stators 4-1 and 4-2 are respectively stator coils 11-1 and 11-2 in which coils 10-1 and 10-2 are wound in cylindrical stator yokes 9-1 and 9-2. Are arranged circumferentially at equal intervals.

  The first feature of the stator support structure for a rotating electrical machine according to the present invention is that, in the axial gap type rotating electrical machine 1 configured as described above, the inner circumferences of the stators 4-1 and 4-2 with respect to the rotor shaft 2 to which the rotor 3 is fixed. It is a point which supports the edge part of a side rotatably. In the example shown in FIG. 1, inner peripheral side brackets 21-1 and 21-2 constituting end portions on the inner peripheral side of the stators 4-1 and 4-2 are interposed via sliding members 22-1 and 22-2. Is mounted on the rotor shaft 2. As the sliding members 22-1 and 22-2, members having good sliding performance such as impregnated bearings can be used.

  The second feature of the stator support structure for a rotating electrical machine according to the present invention is that the positioning means 23 supports the axial force acting on the stator 4-1 and 4-2 as well as the positioning of the stator 4-1 and 4-2 in the axial direction. -1, 23-2 are provided on the rotor shaft 2. In the example shown in FIG. 1, in each of the inner peripheral brackets 21-1 and 21-2 constituting the inner peripheral end portions of the stators 4-1 and 4-2, the opposite side to the side where the rotor 3 exists. Positioning means 23-1, 23-2 are provided.

  The third feature of the stator support structure for a rotating electrical machine according to the present invention is that the outer peripheral side ends of the stators 4-1 and 4-2 are movable in the axial direction with respect to the peripheral wall 5a of the housing 5, and It is the point which supported not to move in the circumferential direction. In the example shown in FIG. 1, of the outermost peripheral brackets 24-1 and 24-2 and the stator yokes 9-1 and 9-2 constituting the outer peripheral ends of the stators 4-1 and 4-2, Gear portions 25-1 and 25-2 (see FIG. 2) with peaks or valleys extending in the axial direction are formed on the outer circumferences of the stator yokes 9-1 and 9-2, and the gear portion 25-1 is formed on the peripheral wall 5a of the housing 5. , 25-2 are formed so that the axially extending groove portions 26-1, 26-2 can be engaged and the gear portions 25-1, 25-2 and the groove portions 26-1, 26-2 are engaged with each other. . As a result, the stators 4-1 and 4-2 can be supported so as to be movable in the axial direction and not to move in the circumferential direction. The above-described example is only an example, and other configurations may be used as long as the same effect is exhibited.

  By providing the first to third features described above, the rotor 3 and the stators 4-1, 4-2 both have a structure in which the axial position is regulated by the rotor shaft 2, and there are few stacked parts. The rotor 3 and the stators 4-1 and 4-2 have a structure that does not involve the aluminum housing 5 or the like having greatly different linear expansion coefficients, and the air gap between the rotor 3 and the stators 4-1 and 4-2. Management accuracy is dramatically improved. Further, by providing the positioning means 23-1, 23-2 on the rotor shaft 2, an axial torque reaction force acting on the rotor 3 side and an axial direction acting on the stator 4-1, 4-2 side are provided. Therefore, the axial direction force does not act on the rotor shaft 2 itself, and the support structure for the axial direction force of the rotor shaft 2 can be simplified.

  Moreover, in the stator support structure of the rotary electric machine of the present invention shown in FIG. 1, as a preferred mode, the axial direction defining portions 27-1 and 27-27 on the rotor shaft 2 between the rotor 3 and the stators 4-1 and 4-2. -2 is provided. And the dimension (what is called an air gap) between the rotor 3 and the stators 4-1 and 4-2 can be regulated by the axial direction defining portions 27-1 and 27-2 so as to be an optimum interval. Cylindrical spacers can be used as the axial direction defining portions 27-1 and 27-2 as long as the rotor shaft 2 can be inserted into the spacers. With this configuration, even when the disk-shaped rotor 3 having the magnets 8-1 and 8-2 therein is attracted to the stator side by the magnetic force, the rotor is provided on the rotor shaft 2. Since the minimum axial gap is secured by the axial direction defining portions 27-1 and 27-2, the magnets 8-1 and 8-2 and the stators 4-1 and 4-2 are caused by a shim selection error during assembly. Workability is improved without any adsorption.

  Furthermore, in the stator support structure for a rotating electrical machine of the present invention shown in FIG. 1, as a preferred embodiment, the positioning means 23-1, 23-2 are composed of a member that can be elastically deformed in the axial direction by an axial force, such as a washer. Has been. By comprising in this way, the difference of the expansion | extension between the rotating shaft of a rotor and the inner peripheral side edge part of a stator can be absorbed.

  Furthermore, in the stator support structure for a rotating electric machine according to the present invention shown in FIG. 1, two bearings 6-6 are used to support the rotor shaft 2 of the rotor 3 at both ends of the housing 5 via bearings 6-1 and 6-2. 1, 6-2 is supported by an axial force so as to be elastically deformable in the axial direction. In the example of FIG. 1, the bearing 6-1 is fixed by the step portion of the rotor shaft 2 and the support member 28-1, whereas the bearing 6-2 constitutes the support member 28-2 from a member such as a washer. However, it is supported so as to be elastically deformable in the axial direction by an axial force. If comprised in this way, the difference of the elongation between the rotating shaft of a rotor and a housing can be absorbed.

  In the assembly of the axial gap end rotating electrical machine 1 having the above-described configuration, the rotor shaft 2 to which the rotor 3 is fixed is disposed in the peripheral wall 5a of the housing 5 by some means, and in this state, the axial direction defining portion 27 is formed from the left and right of the rotor 3. 1 and 27-2 are inserted, and the stators 4-1 and 4-2 are inserted while meshing the gear portions 25-1 and 25-2 with the groove portions 26-1 and 26-2, and the positioning means 23- 1 and 23-2 are provided on the rotor shaft 2 at the left and right positions of the stator 4-1 and 4-2. Finally, the bearings 6-1 and 6-2 are mounted on the housing 5 together with the support members 28-1 and 28-2. By providing, it can be assembled.

  In the above-described example, the axial gap type rotating electrical machine 1 is configured by providing two stators 4-1 and 4-2 for one rotor 3, but an example of one stator for one rotor or The present invention can be similarly applied to examples of a plurality of pairs of rotors and stators.

  The stator support structure for a rotating electrical machine according to the present invention is an axial gap type rotating electrical machine in which at least a pair of stators and a rotor are disposed so as to face each other along a rotation axis. It can be suitably used for applications that improve accuracy.

It is a figure for demonstrating an example of the stator support structure of the rotary electric machine of this invention. It is a figure for demonstrating the relationship between the outer peripheral edge part of a stator, and a housing in the stator support structure of the rotary electric machine of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Axial gap type rotary electric machine 2 Rotor shaft 3 Rotor 4-1 and 4-2 Stator 5 Housing 5a Peripheral wall 6-1 and 6-2 Bearing 7 Rotor yoke 8-1 and 8-2 Magnet 9-1 and 9-2 Stator yoke 10-1, 10-2 Coils 11-1, 11-2 Stator teeth 21-1, 21-2 Inner peripheral side brackets 22-1, 22-2 Sliding members 23-1, 23-2 Positioning means 24-1 , 24-2 Peripheral bracket 25-1, 25-2 Gear portion 26-1, 26-2 Groove portion 27-1, 27-2 Axial direction defining portion 28-1, 28-2 Support portion

Claims (4)

  In a stator support structure for an axial gap type rotating electrical machine in which at least a pair of stators and a rotor are arranged to face each other along a rotation axis in a housing, the inner peripheral end of the stator is rotated with respect to the rotation axis of the rotor. Positioning means that supports the axial force acting on the stator as well as positioning in the axial direction of the stator is provided on the rotating shaft of the rotor, and the outer peripheral side end of the stator is axially positioned with respect to the housing. Is a stator supporting structure for a rotating electric machine, which is movable and supported so as not to move in the circumferential direction.   2. The rotating electrical machine according to claim 1, wherein an axial direction defining portion is provided on a rotating shaft between the rotor and the stator, and a dimension between the rotor and the stator is regulated by the axial direction defining portion. Stator support structure.   The stator support structure for a rotating electrical machine according to claim 1 or 2, wherein the positioning means is constituted by a member that can be elastically deformed in the axial direction by an axial force.   The rotary shaft of the rotor is supported at both ends of the housing via bearings, and one of the two bearings at both ends is supported so as to be movable in the axial direction by an axial force. The stator support structure for a rotating electrical machine according to any one of 1 to 3.

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