JP2015033202A - Fixing structure of rotary electric machine stator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve a stator whirl-stop structure without requiring any particular key hole processing.SOLUTION: A stator 1 is press-fixed inside a stator holding member 2 of a rotary electric machine formed in a cylindrical shape. Linear parts 4 and circular arc parts 5 are alternately provided on a cross section orthogonal to a central axis of the stator 1 of a contact part of the stator 1 and the stator holding member 2. Thereby, the press-fixed stator 1 and the stator holding member 2 are made to be in a different diameter fitting state and a rotational displacement of the stator 1 with respect to the stator holding member 2 is prevented.

Description

  The present invention relates to a structure for fixing a stator to a stator holding member in a rotating electrical machine such as an electric motor or a generator.

  A stator of a rotating electrical machine such as an electric motor or a generator includes a plurality of teeth formed at equal angular intervals for winding a coil. A stator is divided | segmented for every tooth | gear and each division member is comprised by the laminated body of the steel plate of the same shape pressed.

  The divided members are assembled in a cylindrical shape and are fixed to the inside of the case of the rotating electrical machine to constitute a cylindrical stator.

  Patent Document 1 proposes a method of fixing the stator thus configured to the case. According to this prior art, the stator is press-fitted and fixed inside the inner frame as a stator holding member, and is fixed inside the case via the inner frame.

JP 2001-018668 A

  Since the outer peripheral surface of the stator and the inner peripheral surface of the inner frame are circular, in this fixing structure, it is necessary to provide a detent key so that the stator does not rotate with respect to the inner frame.

  For this reason, in the prior art of Patent Document 1, key grooves are provided on the rear surfaces of all divided members, while protrusions that fit into the key grooves are formed on the inner frame.

  That is, according to this fixing structure, both the dividing member and the inner frame require processing for key connection. The labor for the key connection becomes a factor that increases the manufacturing cost of the rotating electrical machine.

  The present invention has been made to solve the above-described problems of the prior art, and an object thereof is to realize a stator detent structure that does not require special key hole processing.

  In order to achieve the above object, the present invention is applied to a stator fixing structure for a rotating electrical machine in which a stator is press-fitted and fixed inside a cylindrical stator holding member. In the fixing structure, linear portions and arc portions are alternately provided in a cross section perpendicular to the central axis of the stator at the contact portion between the stator and the stator holding member.

  By alternately forming linear portions and arc portions in the cross section of the contact portion between the stator and the stator holding member, the stator press-fitted into the stator holding member and the stator holding member are in a different diameter fitting state, and the relative Rotation is prevented. Since neither the stator nor the stator holding member requires key processing, the labor for processing the key hole can be reduced.

It is a disassembled perspective view of a stator, an inner frame, and a case main part explaining the press-fitting process to the inner frame of a stator. It is a perspective view of the division member by embodiment of this invention. It is a principal part cross-sectional view of the stator after the press injection by this Embodiment, and an inner frame. It is a principal part longitudinal cross-sectional view of the stator after the press injection by this Embodiment, and an inner frame. It is a top view of the plank of the base material of the steel plate for division members by embodiment of this invention.

  Referring to FIG. 1, a stator 1 of a rotating electrical machine such as an electric motor or a generator is composed of an assembly of a plurality of divided members 1A divided for each tooth. The stator 1 is press-fitted and fixed inside a bottomed cylindrical inner frame 2 which is a stator holding member.

  Referring to FIG. 4, the stator 1 is held at a predetermined position inside the case 3 via the inner frame 2.

  Referring to FIG. 2, a groove 1B and a strip-shaped protrusion 1C are formed on the side surface of the dividing member 1A. The stator 1 is composed of an assembly that is assembled in a cylindrical shape by fitting a plurality of divided members 1A into the band-shaped projections 1C and the grooves 1B of the adjacent divided members, respectively.

  Referring to FIG. 5, each divided member 1 is composed of a laminate of steel plates pressed from plank 12.

  Referring again to FIG. 2, with respect to the cross section of the stator 1 orthogonal to the central axis of the stator 1, straight portions 4 and arc portions 5 are alternately formed on the outer periphery of each divided member 1 </ b> A. That is, the straight portions 4 are formed at the center and both ends of the outer periphery of each divided member 1 </ b> A, and the arc portion 5 is formed between the straight portions 4. The radius of the arc portion 5 is preferably set equal to the inner diameter of the inner frame 2 or the outer diameter of the stator 1. In other words, it is set equal to the diameter of the contact portion between the stator 1 and the inner frame 2 that is a stator holding member.

  Referring to FIG. 3, the divided member 1 </ b> A formed in this way is assembled into a cylindrical shape, and the stator 1 is formed by winding the coil 10 around the slot between the teeth. A portion surrounded by a one-dot chain line in the drawing corresponds to one divided member 1A.

  The divided member 1A is assembled in such a manner that the straight portions 4 at both ends are continuous to the straight portions 4 of the adjacent divided members 1A. Accordingly, the straight portions 4 and the arc portions 5 are alternately formed on the outer periphery of the assembled stator 1. On the other hand, the inner frame 2 is formed in a cylindrical shape. A linear portion 4 and an arc portion 5 corresponding to the outer peripheral surface of the stator 1 are formed in advance on the inner peripheral surface of the inner frame 2 by press molding. In this way, the stator 1 having the linear portion 4 and the arc portion 5 formed on the outer peripheral surface is press-fitted inside the inner frame 2 having the same inner peripheral surface. As a result, the stator 1 and the inner frame 2 are fitted in different diameters, and the rotational displacement of the stator 1 in the inner frame 2 is prevented.

  The inner frame 2 into which the stator 1 is press-fitted is fixed in a case of the rotating electrical machine with, for example, a bolt.

  The following effects can be obtained by the above fixing structure of the stator 1.

  That is, since the rotation prevention of the stator 1 with respect to the inner frame 2 is realized without key coupling, the work and cost required for the key coupling processing can be reduced.

  Moreover, setting the radius of the circular arc part 5 which connects the adjacent linear part 4 equal to the diameter of the contact part of the stator 1 and the inner frame 2 brings about the following effect. That is, compared with the case where the radius of the circular arc part 5 is set smaller, the difference in plate thickness before and after molding when the inner frame 2 is press-molded can be reduced. In other words, the ironing rate, which is the rate of change in plate thickness due to press molding, can be reduced. If the ironing rate is large, the probability of occurrence of defects such as cracks increases. By setting the radius of the arc portion 5 equal to the diameter of the contact portion between the stator 1 and the inner frame 2 that is the stator holding member, the ironing rate can be suppressed to a small value.

  Moreover, in FIG. 5, the linear part 4 is formed in the center area | region shown to A in the outer periphery of each steel plate which comprises the division member 1A. As a result, the width a of the plank 12 for pressing the steel plate can be reduced as compared with the case where the straight portion 4 is not formed.

  Similarly, straight portions 4 are formed in the regions at both ends shown in FIG. As a result, the width a of the plank 12 from which the steel plate is cut out can be further reduced as compared with the case where the straight portion 4 is an arc.

  Thus, the steel plate which comprises 1 A of division members by forming a linear part and a circular arc part alternately in the outer periphery of the cross section orthogonal to the central axis of the stator 1 of the contact part of the stator 1 and stator holding member. The size of the plank 12 as a base material can be reduced. In other words, the yield of the material of the stator 1 is improved. This also brings about a preferable effect for reducing the manufacturing cost of the rotating electrical machine.

  As described above, the present invention has been described through specific embodiments. However, the present invention is not limited to the above embodiments. Those skilled in the art can make various modifications or changes to these embodiments within the scope of the claims.

  For example, in the above-described embodiment, the straight portions are formed on the outer periphery of each divided member 1A and the central portion and both end portions of the inner peripheral surface of the inner frame 2, respectively. However, the straight portion may be formed only at the central portion of the outer peripheral surface of each divided member 1 </ b> A and the inner peripheral surface of the inner frame 2. Or you may form a linear part only in the both ends of the outer peripheral surface of each division member 1A, and the inner peripheral surface of the inner frame 2. As shown in FIG.

DESCRIPTION OF SYMBOLS 1 Stator 1 A Dividing member 1B Groove 1C Strip-shaped protrusion 2 Inner frame 3 Case 4 Straight line part 5 Arc part 10 Coil 12 Plank

Claims (5)

  In a stator fixing structure for a rotating electrical machine in which a stator is press-fitted and fixed inside a cylindrical stator holding member, a contact portion between the stator and the stator holding member has a straight line in a cross section perpendicular to the center axis of the stator A structure for fixing a stator of a rotating electrical machine, characterized in that a portion and an arc portion are provided alternately.   The stator fixing structure for a rotating electric machine according to claim 1, wherein the arc portion has a radius equal to a radius of a contact portion between the stator and the stator holding member.   The stator fixing structure for a rotating electrical machine according to claim 1 or 2, wherein the stator is composed of an assembly of a plurality of divided members divided in the circumferential direction, and the linear portion is formed at a central portion of the outer peripheral surface of the divided member.   The stator fixing structure for a rotating electrical machine according to any one of claims 1 to 3, wherein the stator is composed of an assembly of a plurality of divided members divided in the circumferential direction, and the straight portions are formed at both ends of the outer peripheral surface of the divided member. .   The stator fixing structure for a rotating electric machine according to claim 3 or 4, wherein the divided member is formed of a laminate of pressed steel plates.

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