JP4775020B2 - Stator fixing structure and electric vehicle - Google Patents

Description

  The present invention relates to a stator fixing structure and an electric vehicle, and more particularly to a stator fixing structure included in a rotating electrical machine and an electric vehicle including the structure.

A stator provided in a rotating electrical machine is conventionally known.
For example, Japanese Patent Laid-Open No. 7-99758 (Patent Document 1) discloses that a tube sealed in a bolt hole is inserted or a heat-resistant seal is applied in order to prevent the varnish from penetrating into the bolt hole. Yes.

  Japanese Patent Application Laid-Open No. 6-141515 (Patent Document 2) discloses that a varnish adhesion preventing agent is applied to the end face protection device in order to facilitate the removal of the end face protection device attached to the stator. .

  In JP-A-6-245415 (Patent Document 3), a cylindrical stator formed by adhering and laminating a plurality of stator pieces by caulking or welding is fixed to a housing with bolts. Is disclosed.

  In Japanese Patent Laid-Open No. 56-103954 (Patent Document 4), a predetermined portion of the outer periphery of the stator core to which the outer frame is welded is melted in advance so that the varnish does not penetrate into the melted portion. Is disclosed.

Further, in Japanese Patent Laid-Open No. 2000-50583 (Patent Document 5), resin injection is performed in a state in which a plurality of electromagnetic steel sheets are pressure welded and a stator piece combined in a ring shape is placed in a mold and fixed in shape. And a step of performing permanent fixing of the stator shape is disclosed.
JP-A-7-99758 JP-A-6-141515 JP-A-6-245415 JP 56-103954 A JP 2000-50583 A

  When a stator core is formed by laminating plate members in the axial direction, and when the fastening member is inserted in the axial direction to fasten the stator core, if the varnish enters the insertion portion of the fastening member, There is concern that sagging (deformation) may occur, the axial force of the fastening member may decrease, or the stator core may be deformed. Patent Documents 1 to 5 do not disclose a configuration sufficient to solve the above problem.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a stator fixing structure in which a reduction in axial force of a fastening member and a deformation of a stator core are suppressed, and an electric vehicle including the structure. Is to provide.

  A stator fixing structure according to the present invention is a stator fixing structure that is fixed to a base portion, and includes a portion in which plate-like members are laminated in the axial direction, and includes a protruding portion and a slot portion protruding in the radial direction. A ring-shaped stator core, a coil provided in the slot portion, a fixing material impregnated in the slot portion, and a fastening member that is inserted into the protruding portion in the axial direction of the stator core and fastens the stator core to the base portion.

  In the stator fixing structure according to the present invention, in one aspect, the plurality of plate-like members included in the stator core are closely fixed at or near the root of the protrusion.

  As a result, the degree of adhesion of the plate-like member at the protruding portion can be increased, so that when the slot portion is impregnated with the fixing material, the fixing material is prevented from entering the protruding portion from the gap between the plurality of plate-like members. be able to. As a result, a reduction in the axial force of the fastening member and deformation of the stator core due to deformation of the fixing material can be suppressed.

In the fixed structure of the stator, multiple plate-like member is closely fixed at both ends in the width direction of the protruding portion located root portion near the protruding portions.

Thereby, the penetration | invasion of the adhering material to a protrusion part can be suppressed effectively.
In the stator fixing structure, preferably, the protruding portion protrudes radially outward of the stator core, the slot portion is provided on the inner peripheral side of the stator core, and the plurality of plate-like members are in close contact between the protruding portion and the slot portion. Fixed.

  Thereby, it is possible to suppress the fixing material impregnated in the slot portion from entering the protruding portion along the radial direction of the stator core.

In the stator fixing structure according to the present invention , preferably , a gap is formed in the vicinity of the root portion of the protruding portion of the stator core.

  As a result, the flow of the fixing material toward the projecting portion can be blocked, so that when the slot portion is impregnated with the fixing material, the fixing material is prevented from entering the projecting portion from the gaps between the plurality of plate-like members. be able to. As a result, a reduction in the axial force of the fastening member and deformation of the stator core due to deformation of the fixing material can be suppressed.

  In the stator fixing structure, preferably, the gap extends in the circumferential direction of the stator core.

Thereby, the penetration | invasion of the adhering material to a protrusion part can be suppressed effectively.
In the stator fixing structure, preferably, the protruding portion protrudes radially outward of the stator core, the slot portion is provided on the inner peripheral side of the stator core, and the gap is provided between the protruding portion and the slot portion.

  Thereby, it is possible to suppress the fixing material impregnated in the slot portion from entering the protruding portion along the radial direction of the stator core.

  In the stator fixing structure, preferably, the plurality of plate-like members included in the stator core are closely fixed at or near the protruding portion, and the gap is a circumferential direction of the portion where the plurality of plate-like members are closely fixed and the stator core. It is provided to line up.

Thereby, the penetration | invasion of the adhering material to a protrusion part can be suppressed more effectively.
The electric vehicle according to the present invention includes the stator fixing structure described above. Thereby, an electric vehicle including a rotating electrical machine having a high stator fixing strength is obtained.

  ADVANTAGE OF THE INVENTION According to this invention, the fixing structure of the stator by which the fall of the axial force of a fastening member and the deformation | transformation of a stator core was suppressed can be obtained.

  Embodiments of the present invention will be described below. Note that the same or corresponding portions are denoted by the same reference numerals, and the description thereof may not be repeated.

  Note that in the embodiment described below, when the number, amount, or the like is referred to, the scope of the present invention is not necessarily limited to the number, amount, or the like. In the following embodiments, each component is not necessarily essential for the present invention.

  FIG. 1 is a diagram schematically showing a configuration of a drive unit to which a stator fixing structure according to an embodiment of the present invention is applied. In the example shown in FIG. 1, the drive unit 1 is a drive unit mounted on a hybrid vehicle as an “electric vehicle”, and includes a motor generator 100, a housing 200, a speed reduction mechanism 300, a differential mechanism 400, and a drive shaft. The receiving part 500 is comprised.

  The motor generator 100 is a rotating electrical machine having a function as an electric motor or a generator. The motor generator 100 is a rotary shaft 120 rotatably attached to the housing 200 via a bearing 110, a rotor 130 attached to the rotary shaft 120, and a stator. 140. The stator 140 has a stator core 141, and a coil 142 is wound around the stator core 141. The coil 142 is electrically connected to the power supply cable 600 </ b> A via a terminal block 210 provided in the housing 200. The other end of the power supply cable 600A is connected to the PCU 600. PCU 600 is electrically connected to battery 700 via power supply cable 700A. Thereby, the battery 700 and the coil 142 are electrically connected.

  The power output from the motor generator 100 is transmitted from the speed reduction mechanism 300 to the drive shaft receiving portion 500 via the differential mechanism 400. The driving force transmitted to the drive shaft receiving portion 500 is transmitted as a rotational force to a wheel (not shown) via a drive shaft (not shown), thereby causing the vehicle to travel.

  On the other hand, during regenerative braking of the hybrid vehicle, the wheels are rotated by the inertial force of the vehicle body. Motor generator 100 is driven via drive shaft receiving portion 500, differential mechanism 400 and reduction mechanism 300 by the rotational force from the wheels. At this time, the motor generator 100 operates as a generator. The electric power generated by motor generator 100 is stored in battery 700 via an inverter in PCU 600.

  The feeding cables 600A and 700A are three-phase cables including a U-phase cable, a V-phase cable, and a W-phase cable. Coil 142 includes a U-phase coil, a V-phase coil, and a W-phase coil, and terminals of these three coils are connected to power supply cables 600A and 700A that are three-phase cables.

  The use of motor generator 100 is not limited to a hybrid vehicle (HV), and may be mounted on other “electric vehicles” (for example, fuel cell vehicles and electric vehicles).

  FIG. 2 is a cross-sectional view of motor generator 100 including a stator fixing structure according to one embodiment of the present invention. In FIG. 2, only the stator accommodating portion and the vicinity thereof in the housing 200 are illustrated for convenience of explanation, but the housing 200 may have a portion other than the stator accommodating portion.

  Referring to FIG. 2, the stator accommodating portion of housing 200 includes a case 220 and a cover 230. The stator core 141 is formed in a ring shape. The stator core 141 is configured by laminating plate-like magnetic bodies (electromagnetic steel plates) such as iron or iron alloy. The stator core 141 is fixed to the case 220 using fastening bolts 143. The fastening bolt 143 is inserted into a bolt hole 141 </ b> A formed so as to extend in the axial direction of the stator core 141.

  A plurality of tooth portions and a slot portion as a recess formed between the tooth portions are formed on the inner peripheral surface of the stator core 141. The slot portion is provided so as to open to the inner peripheral side of the stator core 141. The coil 142 is wound around the tooth portion so as to fit into the slot portion. The U phase, the V phase, and the W phase included in the coil 142 are wound so as to be shifted from each other on the circumference.

  The rotor 130 has a rotor core attached to the rotating shaft 120. A permanent magnet (not shown) is embedded in the rotor core. The rotor core is made of a magnetic material such as iron or an iron alloy. For example, the permanent magnets are arranged at substantially equal intervals in the vicinity of the outer periphery of the rotor core.

  FIG. 3 is a top view of the stator included in the stator fixing structure according to the comparative example. Referring to FIG. 3, stator core 141 has a bolt fastening portion 141B that protrudes radially outward from the outer periphery of the core. The bolt hole 141A is provided in the bolt fastening portion 141B. A varnish 144 is impregnated in the slot portion 141C in which the coil 142 is provided. The varnish 144 penetrates between the plurality of electromagnetic steel plates and flows along the radial direction (arrow DR1 direction) of the stator core 141. And the varnish 144 reaches the bolt fastening part 141B. In addition, a pressure welding portion 145 formed by pressure welding the laminated electromagnetic steel sheets is formed on the outer periphery of the stator core 141.

  When the varnish 144 enters the bolt fastening portion 141B, after the fastening with the fastening bolt 143, the varnish 144 sags (deforms) as time passes. As a result, there is a concern that the fastening axial force of the fastening bolt 143 may decrease or the stator core 141 may be deformed.

  FIG. 4 is a top view showing stator core 141 included in the stator fixing structure according to the present embodiment. Referring to FIG. 4, in the present embodiment, a pressure welded portion 145 is provided in the vicinity of the root portion of bolt fastening portion 141B. More specifically, the pressure welding part 145 is provided in the both ends of the width direction of the bolt fastening part 141B located in the base part vicinity of the bolt fastening part 141B. By doing in this way, the applied pressure in the bolt fastening part 141B can be made high, and the adhesion degree of a some electromagnetic steel plate can be raised. As a result, as shown in FIG. 5, when the slot part 141C is impregnated with the varnish 144, the varnish 144 is prevented from entering the bolt fastening part 141B from the gaps between the plurality of stator plates 1410 (electromagnetic steel plates). As a result, a reduction in the axial force of the fastening bolt 143 and deformation of the stator core 141 due to varnish sag can be suppressed.

  In addition, the position where the pressurization welding part 145 is provided is not limited to the position shown by FIG. 4, For example, the pressurization welding part 145 may be provided in the bolt fastening part 141B.

  FIG. 6 is a top view showing a stator core included in a modification of the stator fixing structure according to the present embodiment. FIG. 7 is a sectional view taken along line VII-VII in FIG.

  Referring to FIGS. 6 and 7, in the present modification, stator core 141 has a gap 146 in the vicinity of the root portion of bolt fastening portion 141B. By doing so, the flow of the varnish 144 from the slot portion 141C toward the bolt fastening portion 141B can be blocked. Therefore, when the slot portion 141C is impregnated with the varnish, the varnish 144 is formed from the gaps between the plurality of stator plates 1410. Can be prevented from entering the bolt fastening portion 141B. As a result, similarly to the above, a reduction in the axial force of the fastening bolt 143 due to the varnish sag and the deformation of the stator core 141 can be suppressed.

  The above contents are summarized as follows. That is, the stator fixing structure according to the present embodiment is a stator 140 fixing structure that is fixed to a case 220 as a “base portion”, and a stator plate 1410 that is a “plate member” is laminated in the axial direction. A ring-shaped stator core 141 having a bolt fastening portion 141B and a slot portion 141C as a “projection portion” that protrudes in the radial direction, a coil 142 provided in the slot portion 141C, and a slot portion 141C. The varnish 144 as the “fixing material” and the fastening bolt 143 as a “fastening member” that is inserted into the bolt fastening portion 141B in the axial direction of the stator core 141 and fastens the stator core 141 to the case 220. The plurality of stator plates 1410 included in the stator core 141 are pressure welded (closely fixed) in the vicinity of the root portion of the bolt fastening portion 141B. Furthermore, in the modification shown in FIGS. 6 and 7, a gap 146 is formed in the vicinity of the root portion of the bolt fastening portion 143 in the stator core 141. In the above description, the example in which both the pressure welding portion 145 and the gap 146 are provided in the vicinity of the root portion of the bolt fastening portion 141B has been described. However, the pressure welding portion 145 is provided in the vicinity of the root portion of the bolt fastening portion 141B. Instead, only the gap 146 may be provided.

  In the above fixing structure, the bolt fastening portion 141B protrudes outward in the radial direction of the stator core 141, and the slot portion 141C is provided on the inner peripheral side of the stator core 141. The pressure welded portion 145 and the gap 146 of the stator plate 1410 are provided between the bolt fastening portion 141B and the slot portion 141C. The pressure welded portion 145 and the gap 146 are provided so as to be aligned in the circumferential direction of the stator core 141.

  According to the stator fixing structure according to the present embodiment, when the slot portion 141C is impregnated with varnish, the varnish can be prevented from entering the bolt fastening portion 141B from the gaps between the plurality of stator plates 1410. As a result, a reduction in the axial force of the fastening bolt 143 and deformation of the stator core 141 due to varnish sag (deformation) can be suppressed.

  Although the embodiments of the present invention have been described above, the embodiments disclosed this time should be considered as illustrative in all points and not restrictive. For example, in the above example, the penetration of the varnish 144 into the bolt fastening portion 141B is completely suppressed. However, even when some varnish 144 penetrates into the bolt fastening portion 141B, the pressure welded portion 145 or the gap 146 As long as the penetration of the varnish 144 into the bolt fastening portion 141B is suppressed, it should be construed as belonging to the scope of the present invention. The scope of the present invention is defined by the terms of the claims, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

It is a figure which shows schematically the structure of the drive unit to which the fixing structure of the stator which concerns on one embodiment of this invention is applied. It is sectional drawing of the rotary electric machine shown by FIG. It is the top view which showed the stator core contained in the stator fixing structure which concerns on a comparative example. It is the top view which showed the stator core contained in the fixing structure of the stator which concerns on one embodiment of this invention. It is VV sectional drawing in FIG. It is the top view which showed the stator core contained in the modification of the fixing structure of the stator which concerns on one embodiment of this invention. It is VII-VII sectional drawing in FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Drive unit, 100 Motor generator, 110 Bearing, 120 Rotating shaft, 130 Rotor, 140 Stator, 141 Stator core, 141A Bolt hole, 141B Bolt fastening part, 141C Slot part, 142 Coil, 143 Fastening bolt, 144 Varnish, 145 Pressurization Welded part, 200 housing, 210 terminal block, 220 case, 230 cover, 300 speed reduction mechanism, 400 differential mechanism, 500 drive shaft receiving part, 600 PCU, 600A, 700A power supply cable, 700 battery, 1410 stator plate.

Claims (7)

A stator fixing structure fixed to a base part,
A ring-shaped stator core that includes a portion in which the plate-like member is laminated in the axial direction, and has a protruding portion and a slot portion protruding in the radial direction;
A coil provided in the slot portion;
A fixing material impregnated in the slot portion;
A fastening member that is inserted into the projecting portion in the axial direction of the stator core and fastens the stator core to the base portion;
The stator fixing structure, wherein the plurality of plate-like members included in the stator core are closely fixed at both end portions in the width direction of the projecting portion located in the vicinity of the root portion of the projecting portion . The protruding portion protrudes radially outward of the stator core,
The slot portion is provided on the inner peripheral side of the stator core,
The stator fixing structure according to claim 1 , wherein the plurality of plate-like members are closely fixed between the projecting portion and the slot portion. The gap in the vicinity root portion of the projecting portion is formed, the fixing structure of a stator according to claim 1 or claim 2 in the scan stator core. The stator fixing structure according to claim 3 , wherein the gap extends in a circumferential direction of the stator core. The protruding portion protrudes radially outward of the stator core,
The slot portion is provided on the inner peripheral side of the stator core,
The stator fixing structure according to claim 3 or 4 , wherein the gap is provided between the protruding portion and the slot portion. The plurality of plate-like members included in the stator core are closely fixed at the projecting portion or the vicinity thereof,
The stator fixing structure according to any one of claims 3 to 5 , wherein the gap is provided so as to be aligned in a circumferential direction of the stator core and a portion where the plurality of plate-like members are closely fixed. An electric vehicle including the stator fixing structure according to any one of claims 1 to 6 .

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