JP2011205845A - Rotary electric machine and fixing method of stator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary electric machine capable of controlling a movement along the axial direction of the stator and capable of easily fixing the stator to a housing, and to provide a fixing method of a stator.SOLUTION: In an electric motor, engaging projections 22b extended in the circumferential direction of a fixed core 22 towards the other end side from one end side in the axial direction of the fixed core 22 are formed to the outer peripheral surface of the fixed core 22. Engaging recessed grooves 12f extended in the circumferential direction of a rear housing 12 towards the other end side from one end side in the axial direction of the rear housing 12 are formed to the inner peripheral surface of the rear housing 12. The fixed core 22 is fixed to the rear housing 12 by engaging the engaging projections 22b with the engaging recessed grooves 12f while the movement in the axial direction of the fixed core 22 (the stator) is controlled.

Description

  The present invention relates to a rotating electric machine having a stator fixed in a housing and a fixing method of the stator.

  For example, an electric compressor is used as a compressor used in a vehicle air conditioner, and the electric compressor is integrally provided with an electric motor. The electric motor includes an annular stator and a rotor provided on a rotating shaft inside the stator. The stator includes an annular fixed iron core and a coil wound around the fixed iron core. The stator is fixed to the housing by fixing the fixed iron core to the inner surface of the housing.

  Generally, the fixed iron core is fixed to the housing by shrink fitting. In this shrink fitting, after the housing is heated and expanded, the fixed iron core is put into the housing, the housing is cooled, and the inner peripheral surface of the housing is pressed against the outer peripheral surface of the fixed core by contraction accompanying the transition to room temperature. Is done.

  However, shrink fitting requires a heating process of the housing, an insertion process of the fixed iron core, and a cooling process of the housing and has a long tact time. Further, when the housing contracts, the fixed iron core is pressed from the radially outer side toward the inner side. For this reason, there is a high possibility that the fixed iron core will deviate from a perfect circle due to the stress caused by pressing, and if the fixed iron core deviates from the perfect circle, the distance between the inner peripheral surface of the fixed iron core and the outer peripheral surface of the rotor However, it is not uniform over the entire circumference in the circumferential direction of the rotor, and the vibration of the rotating electric motor housing becomes large.

  Therefore, as a method of fixing the fixed iron core to the housing by a method other than shrink fitting, for example, Patent Document 1 is cited. In Patent Document 1, a plurality of key-shaped protrusions are provided on the outer peripheral portion of the fixed armature core (fixed core), and an inlay corresponding to the protrusion is formed on the inner peripheral surface of the case (housing). ing. And after apply | coating an adhesive agent to the outer peripheral part of a fixed armature core, a fixed armature and a case are assembled by inserting a projection part in an inlay.

JP-A-4-368438

  However, in Patent Document 1, it is necessary to apply an adhesive to the outer peripheral portion of the fixed armature core in order to restrict the fixed armature from moving with respect to the case along the axial direction. There was a problem that fixing the child to the case was troublesome.

  The present invention has been made in view of the above-described conventional problems, and an object thereof is to restrict movement of the stator along the axial direction and to easily fix the stator to the housing. An object of the present invention is to provide a rotating electric machine and a fixing method of a stator.

  In order to solve the above problems, the invention according to claim 1 is a rotating electrical machine having a stator fixed in a housing, wherein one end of the fixed core in the axial direction is provided on the outer peripheral surface of the fixed core in the stator. An engaging protrusion that extends in the circumferential direction of the fixed iron core from the side toward the other end, and is formed on the inner peripheral surface of the housing from one end in the axial direction of the housing toward the other end. An engaging groove extending in the circumferential direction is formed, and the stator is fixed to the housing by engaging the engaging protrusion with the engaging groove. Note that the “circumferential direction” in which the engagement protrusion extends does not indicate a direction extending along the peripheral surface of the fixed core so as to be orthogonal to the axial direction of the fixed core, but in the axial direction of the fixed core. A direction extending along the peripheral surface of the fixed core from one end side to the other end side of the fixed core so as to be inclined is shown.

  According to this, the engagement protrusion and the engagement recess are formed so as to extend in the circumferential direction, respectively. For this reason, when the engaging protrusion and the engaging groove are engaged, the engaging protrusion is engaged with the inner surface of the engaging groove, even if the stator is about to move in the axial direction. Movement relative to the housing along the direction can be restricted. Therefore, in order to restrict the movement of the stator in the axial direction, it is not necessary to apply an adhesive to the outer peripheral surface of the stator, and the stator can be easily fixed to the housing.

  In addition, the fixed iron core is formed by laminating a plurality of steel plates, and each steel plate has a protrusion on a peripheral edge thereof, and the engaging protrusion has the protrusion formed on the fixed iron core. The plurality of steel plates may be sequentially shifted in the circumferential direction so as to be sequentially shifted in the circumferential direction. According to this, the engagement protrusion can be easily formed on the fixed iron core.

  The engaging protrusion and the engaging concave shape may be formed to extend in a spiral shape. According to this, the outer peripheral surface of the fixed iron core can be formed in a screw shape by the engaging protrusion, and the inner peripheral surface of the housing can be formed in the screw hole shape by the engaging recess. Therefore, the stator can be fixed to the housing so that the screw is screwed into the screw hole.

  Further, the engagement protrusion and the engagement recess may be formed in pairs. According to this, even if a gap extending in the circumferential direction of the housing is formed between the engagement ridge and the engagement groove, the movable range of the engagement ridge in the gap is defined as the engagement ridge. It can be made smaller than the case where the engagement grooves are one by one.

In addition, even if a fitting member is fitted in a gap that is adjacent to the engaging protrusion along the circumferential direction of the housing and is formed between the engaging protrusion and the engaging recess. Good.
According to this, it can prevent reliably that a stator moves with respect to a housing along the axial direction by fitting of a fitting member.

  In order to solve the above problem, the invention according to claim 6 is a method of fixing the stator to the housing in a rotating electric machine having a stator fixed in the housing, wherein the stator In the outer peripheral surface of the fixed iron core, an engaging protrusion that extends in the circumferential direction of the fixed iron core from one axial end side to the other end side of the fixed iron core is formed. An engaging groove extending in the circumferential direction of the housing from one axial end side to the other end side of the housing is formed, the other end of the engaging protrusion is inserted into one end of the engaging groove, and the stator The stator is fed into the housing while rotating around the center axis of the fixed iron core, and the stator is fixed to the housing by engaging the engaging protrusion with the engaging recess. is there.

  According to this, the engaging protrusion can be engaged with the engaging groove by feeding the engaging protrusion into the engaging groove while rotating the stator. And the engaging protrusion and the engaging groove are formed so as to extend in the circumferential direction. For this reason, when the engaging protrusion and the engaging groove are engaged, the engaging protrusion is engaged with the inner surface of the engaging groove, even if the stator is about to move in the axial direction. Movement relative to the housing along the direction can be restricted. Therefore, in order to restrict the movement of the stator in the axial direction, it is not necessary to apply an adhesive to the outer peripheral surface of the stator, and the stator can be easily fixed to the housing.

  In addition, a fitting member may be fitted in a gap formed adjacent to the engagement protrusion along the circumferential direction of the housing and between the engagement protrusion and the engagement recess. According to this, it can prevent reliably that a stator moves with respect to a housing along the axial direction by fitting of a fitting member.

  According to the present invention, the movement of the stator along the axial direction can be restricted, and the stator can be easily fixed to the housing.

Sectional drawing which shows the electric compressor of embodiment. (A) is a side view which shows a fixed iron core, (b) is a top view which shows a fixed iron core. (A) is sectional drawing which shows a rear housing, (b) is a top view of a rear housing. The perspective view which shows the state before inserting a stator with respect to a rear housing. Sectional drawing which shows the state by which the stator was fixed to the housing. FIG. 6 is a cross-sectional view taken along line 6-6 in FIG. 1 illustrating a state in which the stator is fixed to the housing.

DESCRIPTION OF EMBODIMENTS Hereinafter, an embodiment in which a rotating electric machine and a stator fixing method of the present invention are embodied as an electric motor as a motor and a fixing method of a fixed iron core will be described with reference to FIGS.
First, an electric compressor provided with an electric motor will be described. As shown in FIG. 1, the housing 11 of the electric compressor 10 includes a rear housing 12 having a bottomed cylindrical shape, and a front housing 13 joined to an opening end of the rear housing 12. The housing 11 houses an electric motor M and a compression mechanism C driven by the electric motor M. In this embodiment, the compression mechanism C is a scroll type. A drive shaft 14 that is rotated by the drive force of the electric motor M is accommodated in the housing 11. One end of the drive shaft 14 is coupled to the compression mechanism C, and the other end is rotatably supported by a bearing 15 provided in the rear housing 12.

  Next, the electric motor M will be described. The electric motor M includes a stator 20 fixed to the inner peripheral surface of the rear housing 12 and a rotor 21 disposed in the stator 20. As shown in FIG. 6, the rotor 21 is fixed to the drive shaft 14 so as to be integrally rotatable.

  The stator 20 includes a substantially annular fixed iron core 22, and a coil 23 is wound around a plurality of teeth 22 a formed on the fixed iron core 22. As shown in FIG. 2A, the fixed iron core 22 is formed by laminating a plurality of silicon steel plates 221 as steel plates formed in a substantially disk shape by press working or the like.

  As shown in FIGS. 2A and 2B, a pair of engaging protrusions 22 b are formed on the outer peripheral surface of the fixed iron core 22. One end of each engaging protrusion 22b is located on the same plane as one end surface of the fixed iron core 22 in the axial direction (direction in which the central axis L extends), and extends in a spiral shape along the circumferential direction of the fixed iron core 22. Furthermore, the other end of each engagement protrusion 22b is formed so as to be located on the same plane as the other axial end surface of the fixed iron core 22. In other words, the engaging protrusion 22 b extends from one end surface of the fixed iron core 22 toward the other end surface while extending along the outer peripheral surface of the fixed iron core 22. Therefore, in the present embodiment, the circumferential direction in which the fixed core 22 extends indicates that the fixed core 22 extends along the peripheral surface (outer peripheral surface) of the fixed core 22 so as to be inclined with respect to the axial direction of the fixed core 22.

  Further, one end of each of the pair of engaging protrusions 22b is positioned on one radial line J1 of the fixed iron core 22, and the other end is positioned on one radial line J2 of the fixed iron core 22. It is formed as follows. In other words, the pair of engaging protrusions 22 b are formed at positions facing the fixed iron core 22 in the radial direction.

  The directions extending from one end to the other end of both engaging ridges 22b are the same. In this embodiment, both engaging ridges 22b extend from one end to the other end along the clockwise direction. It is formed as follows. Then, a double thread is formed on the outer peripheral surface of the fixed iron core 22 by the pair of engaging protrusions 22b.

  Each engagement protrusion 22b includes a plurality of silicon steel plates such that a pair of protrusions 221a that protrude from the peripheral edges of the plurality of silicon steel plates 221 are sequentially displaced along the circumferential direction of the fixed iron core 22. It is formed by laminating 221 in order in the circumferential direction. The tip edge of each protrusion 221a extends along the circumferential direction of the silicon steel plate 221 and is formed in an arc shape concentric with the outer peripheral edge of the silicon steel plate 221. The tip edge of the protrusion 221a may have an arc shape that is not concentric with the outer peripheral edge of the silicon steel plate 221 or may be formed in a straight line.

  Here, as shown to Fig.2 (a), let the straight line which passes on the extension line of the outer periphery of the silicon steel plate 221 and is orthogonally crossed with respect to the protrusion direction of the protrusion part 221a be the tangent F1. The length of the protrusion 221a along the extending direction of the tangent line F1 is defined as a width W1 of the protrusion 221a. The protrusion 221a protrudes in the radial direction of the silicon steel plate 221 so as to have a certain width W1 from the outer peripheral edge of the silicon steel plate 221, and only the tip edge thereof is formed in an arc shape.

  When a plurality of silicon steel plates 221 are stacked using a jig (not shown), the silicon steel plates 221 to be stacked next are circumferentially arranged with respect to the silicon steel plates 221 set on the jig. The position of the protrusion 221a of the silicon steel plate 221 to be stacked next is slightly shifted in the circumferential direction with respect to the protrusion 221a set on the jig. Then, as the plurality of stacked protrusions 221a are displaced in the circumferential direction, engaging protrusions 22b extending spirally along the outer peripheral surface are formed on the outer peripheral surface of the fixed iron core 22.

Next, a structure formed on the rear housing 12 in order to fix the electric motor M having the above configuration to the rear housing 12 will be described.
As shown in FIG. 3A, a small diameter portion 12 a is formed on the bottom side of the rear housing 12. In the rear housing 12, an intermediate diameter portion 12b having an inner diameter larger than that of the small diameter portion 12a is formed on one axial end side (opening end side) of the rear housing 12 from the small diameter portion 12a. The inner diameter portion 12b has an inner diameter slightly larger than the outer diameter of the fixed iron core 22, and can be inserted into the intermediate diameter portion 12b while rotating the fixed iron core 22.

  Further, in the rear housing 12, a large diameter portion 12c having an inner diameter larger than that of the medium diameter portion 12b is formed on one end side (opening end side) of the rear housing 12 from the medium diameter portion 12b. A contact step portion 12d is formed on the inner peripheral surface of the rear housing 12 due to the difference in inner diameter between the small diameter portion 12a and the medium diameter portion 12b. Further, a step portion 12e is formed on the inner peripheral surface of the rear housing 12 due to a difference in inner diameter between the medium diameter portion 12b and the large diameter portion 12c.

  A pair of engaging recesses 12f are formed on the inner peripheral surface of the medium diameter portion 12b from the step 12e (one axial end of the rear housing 12) to the contact step 12d (the other axial end of the rear housing 12). It is formed to extend. Each engagement groove 12f is formed so that one end thereof opens on the step portion 12e and extends spirally along the circumferential direction of the medium diameter portion 12b, and the other end of the engagement groove 12f is It is formed so as to be positioned on the contact step 12d. As shown in FIG. 3 (b), each of the pair of engaging recesses 12f has one end side opening located on one diameter line J3 of the middle diameter portion 12b and each other end side opening. Is formed so as to be positioned on one diameter line J4 of the medium diameter portion 12b. That is, the pair of engaging recesses 12f are formed at positions facing the radial direction of the medium diameter portion 12b.

  The direction extending from one end to the other end of both engaging grooves 12f is the same, and in this embodiment, both engaging grooves 12f extend from one end to the other along the clockwise direction. It is formed as follows. Then, two screw grooves are formed on the inner peripheral surface of the medium diameter portion 12b by the pair of engaging recesses 12f.

  The length from the inner peripheral surface of the middle diameter portion 12b to the inner bottom surface of the engaging groove 12f, that is, the depth of the engaging groove 12f is constant. The depth of the engaging recess 12f is deeper than the protruding height of each protrusion 221a that forms the engaging protrusion 22b.

  Here, a straight line passing through the extension line of the inner peripheral surface of the medium diameter portion 12b and extending orthogonally to the depth direction of the engagement groove 12f is defined as a tangent line F2. When the length of the engaging groove 12f along the extending direction of the tangent line F2 is the opening width W2 of the engaging groove 12f, the opening width W2 of each engaging groove 12f is the width W1 of each protrusion 221a. It is formed slightly larger.

  As shown in FIG. 5, in the state where the electric motor M is fixed to the rear housing 12, the other end surface of the fixed iron core 22 contacts the contact step portion 12 d, and the other axial end of the rear housing 12 of the stator 20. Movement to the side (bottom side) is restricted. In addition, the engaging protrusions 22b are inserted into the respective engaging grooves 12f, and the engaging grooves 12f and the engaging protrusions 22b engage with each other to move the stator 20 in the axial direction and in the circumferential direction. Movement to is restricted. Further, as shown in FIGS. 5 and 6, a gap adjacent to the engaging protrusion 22b is formed between each engaging recess 12f and the engaging protrusion 22b along the circumferential direction of the medium diameter portion 12b. Is formed. A fitting pin P as a fitting member is fitted in this gap. Then, the movement of the stator 20 in the axial direction is prevented by the fitting of the fitting pin P.

Next, a method for fixing the stator 20 to the rear housing 12 will be described.
A coil 23 is wound around the teeth 22a of the fixed iron core 22 in advance, but the coil 23 is not shown in FIG.

  First, the fixed iron core 22 is accommodated in the rear housing 12, and the other end side of the pair of engaging protrusions 22b is aligned with and inserted into one end opening (step portion 12e side) of the engaging recess 12f. Then, as shown in FIG. 4, the engaging protrusions 22b are engaged with the engaging protrusions 22b while rotating the fixed iron core 22 in the clockwise direction so that the engaging protrusions 22b extend along the spiral direction of the engaging recess 12f. Insert into the strip 12f. Then, the fixed iron core 22 is fed into the medium diameter portion 12b so that the double screw of the fixed iron core 22 is screwed into the double screw hole of the medium diameter portion 12b.

  As shown in FIG. 1, when the other end surface of the fixed iron core 22 comes into contact with the contact step portion 12d, the fixed iron core 22 is disposed in the middle diameter portion 12b. As shown in FIG. 5, a gap adjacent to the engagement protrusion 22b is formed along the circumferential direction of the intermediate diameter portion 12b between each engagement recess 12f and the engagement protrusion 22b. And the fitting pin P as a fitting member is fitted in this clearance gap. Then, the fixed iron core 22 is fixed to the medium diameter part 12b in a state where movement is restricted both in the circumferential direction and the axial direction of the medium diameter part 12b. Finally, the rotor 21 is disposed in the fixed iron core 22 and the electric motor M is fixed to the rear housing 12.

According to the above embodiment, the following effects can be obtained.
(1) A pair of engaging protrusions 22b extending in the circumferential direction from one end of the fixed iron core 22 toward the other end are formed along the outer peripheral surface of the fixed iron core 22, and the inner periphery of the rear housing 12 (housing 11). An engaging recess 12f of the rear housing 12 was formed on the surface. Since the engagement protrusion 22b and the engagement recess 12f are engaged with each other, the engagement causes the fixed iron core 22, that is, the stator 20, to move relative to the rear housing 12 along the axial direction thereof. Can be regulated. Therefore, in order to restrict the movement of the stator 20 in the axial direction, it is not necessary to apply an adhesive to the outer peripheral surface of the stator 20, and the stator 20 can be easily fixed to the rear housing 12. As a result, the electric motor M can be easily fixed to the housing 11.

  (2) A pair of engaging protrusions 22b extending in the circumferential direction from one end of the fixed iron core 22 to the other end are formed on the outer peripheral surface of the fixed iron core 22, and on the inner peripheral surface of the rear housing 12 (housing 11). The engaging recess 12f extending along the circumferential direction of the rear housing 12 was formed. Since the engagement protrusion 22b and the engagement recess 12f are engaged, the engagement restricts the fixed iron core 22, that is, the stator 20, from moving with respect to the rear housing 12 along the axial direction. can do. Therefore, unlike the case where the stator 20 is shrink-fitted and fixed to the rear housing 12, the fixed iron core 22 is not pressed from the radially outer side to the inner side when the rear housing 12 contracts, The shape of the fixed iron core 22 does not deviate from a perfect circle due to the stress accompanying the pressing. Therefore, it is possible to eliminate the vibration and noise of the electric motor M caused by the shape of the fixed iron core 22 deviating from a perfect circle. As a result, the electric compressor 10 using the electric motor M can suppress vibration during operation.

  (3) A pair of protrusions 221a are formed on the periphery of each of the plurality of silicon steel plates 221 forming the fixed iron core 22. And when forming the fixed iron core 22, by laminating a plurality of silicon steel plates 221 so that the protrusions 221a are sequentially displaced in the circumferential direction of the fixed iron core 22, the engaging protrusions 22b are formed on the fixed iron core 22. Formed. Therefore, the engaging protrusion 22b can be formed simultaneously with the formation of the fixed iron core 22, and the engaging protrusion 22b can be easily formed.

  (4) The engaging protrusions 22b and the engaging recesses 12f are formed so as to extend spirally from one end of the fixed iron core 22 toward the other end along the outer peripheral surface of the fixed iron core 22. For this reason, a double thread can be formed in the outer peripheral surface of the fixed iron core 22 by the engagement protrusion 22b, and a double thread hole can be formed in the inner peripheral surface of the rear housing 12 by the engagement recess 12f. Therefore, the engagement protrusion 22b and the engagement recess 12f can be engaged like a screw and a screw hole, and the fixing operation of the stator 20 to the rear housing 12 can be performed smoothly. Can do.

  (5) In a state where the engaging protrusion 22b is engaged with the engaging groove 12f, a gap is formed between the engaging protrusion 22b and the engaging groove 12f, and the fitting pin P is inserted in this gap. It is mated. For this reason, it can prevent reliably that the engagement protrusion 22b rattles in the engagement recess 12f by the fitting of the fitting pin P.

  (6) In a state where the engaging protrusion 22b is engaged with the engaging groove 12f, a gap is formed between the engaging protrusion 22b and the engaging groove 12f, and the fitting pin P is inserted in this gap. It is mated. By fitting the fitting pins P, it is possible to reliably prevent the stator 20 from moving with respect to the rear housing 12 along the axial direction.

  (7) The pair of engaging protrusions 22b are formed at positions facing the radial direction of the fixed iron core 22, and the pair of engaging recesses 12f are formed at positions facing the radial direction of the rear housing 12. For this reason, when a force in the rotational direction is applied to the fixed iron core 22, the force can be received evenly on the inner surface of the engaging recess 12f via the pair of engaging protrusions 22b.

  (8) The pair of engaging protrusions 22b are formed at positions facing the radial direction of the fixed iron core 22, and the pair of engaging recesses 12f are formed at positions facing the radial direction of the rear housing 12. For this reason, even if a gap is formed between the engaging ridge 22b and the engaging groove 12f, the movable range of the engaging ridge 22b in the gap is the same as the engaging ridge 22b and the engaging groove 12f. Can be reduced compared to the case where each is one by one.

  (9) A pair of engaging protrusions 22b extending spirally along the circumferential direction of the fixed core 22 from one end to the other end of the fixed core 22 along the outer peripheral surface of the fixed core 22 and the rear On the inner peripheral surface of the housing 12 (housing 11), an engaging groove 12f extending in a spiral shape along the circumferential direction of the rear housing 12 was formed. The stator 20 can be fixed to the rear housing 12 by feeding the engaging protrusion 22b into the engaging recess 12f while rotating the stator 20. Since the engagement protrusion 22b and the engagement recess 12f are helically engaged, the engagement can restrict the movement of the stator 20 relative to the rear housing 12 along the axial direction. . Therefore, in order to restrict the movement of the stator 20 in the axial direction, it is not necessary to apply an adhesive to the outer peripheral surface of the stator 20, and the stator 20 can be easily fixed to the rear housing 12. As a result, the electric motor M can be easily fixed to the housing 11.

  (10) A contact step 12 d is formed on the inner peripheral surface of the rear housing 12. The engaging recess 12f is formed to extend until the other end reaches the contact step 12d. For this reason, when the stator 20 is assembled to the rear housing 12 while rotating, the other end surface of the fixed iron core 22 comes into contact with the contact step 12d, and further movement of the fixed iron core 22 is restricted. It can be recognized that the engagement protrusion 22b is engaged with the engagement recess 12f.

  (11) A pair of engaging protrusions 22b extending spirally along the circumferential direction of the fixed iron core 22 from one end to the other end of the fixed iron core 22 along the outer peripheral surface of the fixed iron core 22 and the rear On the inner peripheral surface of the housing 12 (housing 11), an engaging groove 12f extending in a spiral shape along the circumferential direction of the rear housing 12 was formed. The stator 20 can be fixed to the rear housing 12 by feeding the engaging protrusion 22b into the engaging recess 12f while rotating the stator 20. Conversely, the stator 20 can be easily detached from the rear housing 12 by rotating the stator 20. Therefore, repair, inspection, etc. of the stator 20 can be easily performed.

In addition, you may change the said embodiment as follows.
In the embodiment, the fitting pin P does not have to be fitted in the gap formed between the engaging protrusion 22b and the engaging groove 12f.

  In the embodiment, the engagement protrusion 22b and the engagement groove 12f do not have to be provided one by one. The engagement protrusion 22b and the engagement groove 12f are one each, and one engagement protrusion 22b. Thus, a single thread may be formed in the fixed iron core 22 and a single thread hole may be formed in the rear housing 12 by a single engaging recess 12f. Or it is good also considering the engagement protrusion 22b and the engagement recess 12f as three each. Furthermore, as long as the engagement protrusion 22b and the engagement groove 12f can be engaged, the numbers of the engagement protrusion 22b and the engagement groove 12f may not be the same.

  In the embodiment, the engaging protrusion 22b and the engaging groove 12f do not have to extend in a spiral shape, and the engaging protrusion 22b is engaged with the engaging groove 12f by rotating the stator 20. If possible, the shapes of the engagement protrusion 22b and the engagement recess 12f are not limited to the embodiment.

  In the embodiment, the engaging ridge 22b is formed so as to extend from one end surface to the other end surface of the fixed iron core 22, but if the engaging ridge 22b extends in the circumferential direction of the fixed iron core 22, the engaging ridge 22b. The length of 22b is not limited to the embodiment.

In the embodiment, the present invention is embodied in the fitting pin P as the fitting member, but may be changed to a screw, a bolt, or the like other than the fitting pin P.
In the embodiment, the engaging protrusion 22b is formed by sequentially shifting the protrusion 221a formed on the silicon steel plate 221 in the circumferential direction, but the silicon steel plate 221 on which the protrusion 221a is not formed is stacked. After forming the fixed iron core 22, the outer peripheral surface of the fixed iron core 22 may be cut to form the engaging protrusion 22b.

  In the present embodiment, the electric motor M that is the driving source of the electric compressor 10 is embodied as a rotating electric machine, but the electric motor M may be embodied in an induction motor or a reluctance motor, and more specifically in a generator as well as an electric motor. May be used.

  In the present embodiment, the compression mechanism C is embodied as a scroll type as the electric compressor 10 including the electric motor M, but may be changed to a piston type or a vane type.

  M: Electric motor as a rotating electric machine, P: Fitting pin as a fitting member, 12: Rear housing as a housing, 12f: Engaging groove, 20 ... Stator, 22 ... Fixed iron core, 22b ... Engaging protrusion Article, 221 ... Silicon steel plate as a steel plate, 221a ... Projection.

Claims (7)

In a rotating electrical machine having a stator fixed in a housing,
On the outer peripheral surface of the fixed iron core in the stator, an engagement protrusion that extends in the circumferential direction of the fixed iron core from one axial end side to the other end side of the fixed iron core is formed.
On the inner peripheral surface of the housing, an engagement groove that extends in the circumferential direction of the housing from one axial end side to the other end side of the housing is formed,
A rotating electrical machine in which the engaging ridge is engaged with an engaging groove and the stator is fixed to the housing.   The fixed iron core is formed by laminating a plurality of steel plates, and each steel plate has a protrusion on the periphery, and the engaging protrusion has a protrusion around the fixed iron core. The rotating electrical machine according to claim 1, wherein the plurality of steel plates are sequentially shifted in the circumferential direction and stacked so as to be sequentially shifted in the direction.   The rotating electrical machine according to claim 1, wherein the engaging protrusion and the engaging concave shape are formed to extend in a spiral shape.   The rotating electrical machine according to any one of claims 1 to 3, wherein the engagement protrusion and the engagement recess are formed in pairs.   The fitting member is fitted in a gap formed adjacent to the engagement protrusion along the circumferential direction of the housing and between the engagement protrusion and the engagement recess. The rotating electrical machine according to claim 4. A method of fixing the stator to the housing in a rotating electrical machine having a stator fixed in the housing,
On the outer peripheral surface of the fixed iron core in the stator, an engaging protrusion extending in the circumferential direction of the fixed iron core from one axial end side to the other end side of the fixed iron core is formed, and on the inner peripheral surface of the housing Forming an engaging groove extending in the circumferential direction of the housing from one axial end side to the other end side of the housing,
Insert the other end of the engaging protrusion into one end of the engaging groove,
Sending the stator into the housing while rotating the stator around the center axis of the fixed iron core,
A stator fixing method in which the engaging protrusion is engaged with the engaging recess to fix the stator to the housing.   The fitting member is fitted into a gap formed adjacent to the engagement protrusion along the circumferential direction of the housing and between the engagement protrusion and the engagement recess. Stator fixing method.

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