JP2008048466A - Rotary electric machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce vibrations transmitted from a stator to a casing. <P>SOLUTION: A rotary electric machine 100 includes a motor casing 104 that stores a rotor and a stator 102, a bolt 200 that fastens the stator 102 to the motor casing 104, and a stacked-shim unit 202 that is provided around the axial portion of the bolt 200 between the stator 102 and the motor casing 104 and that absorbs at least the vibrations of the stator 102 in the direction that perpendicularly intersects the rotating shaft of the rotary electric machine 100. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a rotating electrical machine including a rotor and a stator, and more particularly to a structure for fixing a stator to a casing that reduces transmission of vibration generated in the stator to the casing.

  HV (Hybrid Vehicle), EV (Electric Vehicle), and FCV (Fuel Cell Vehicle) vehicles are equipped with a rotating electrical machine as a drive source. The rotating electrical machine includes a rotor, a stator, and a casing. In such a rotating electric machine, a structure in which a stator is fastened to a casing by a bolt is known.

  For example, Japanese translations of PCT publication No. 2005-53271 (Patent Document 1) discloses a method for assembling a power generation unit that overcomes the problem of indirect centering of a stator in a rotor. This method of assembling the power generation unit is a method of assembling a power generation unit comprising a generator and a piston internal combustion engine as a drive mechanism, particularly for centering the inner stator disposed with a gap in the outer rotor. In this method of assembly, the outer rotor of the generator is fixed to the drive engine and coupled with the drive system of the drive engine, and at least two centering bolts distributed in the circumferential direction are seen in the radial direction. Inserting into the centering groove provided in the rotor / stator to partially accommodate the centering bolt that bridges the gap, and inserting the stator along the centering bolt in the rotor To center the stator in the rotor, fix the stator on the generator case member at the centered position, and fix the generator case member on the connection case member of the drive engine, and center from the gap The step consists of removing the bolt.

According to the method of assembling the power generation unit disclosed in the above-mentioned publication, the centering of the stator in the rotor is performed in a very suitable manner.
JP 2005-53271 A

  However, in the power generation unit disclosed in the above publication, the stator is fixed to the casing because the stator is fastened by a stator screw between the stator and the casing via a spacing sleeve. .

  When electric power is supplied to the coil wound around the stator, a magnetic field is generated in the stator. Based on the generated magnetic field, a magnetic flux is formed between the rotor and the stator, so that a rotational force is generated in the rotor. When a rotational force is developed in the rotor, the stator receives a reaction force against the rotational force developed in the rotor. When the rotating electrical machine operates, the stator vibrates based on the received reaction force.

  Therefore, when the stator is fixed to the casing, there is a problem that resonance between the stator and the casing occurs. As a result, in a vehicle in which a rotating electrical machine is mounted as a drive source, there is a problem that noise is generated from components of the drive system (for example, a transaxle).

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a rotating electrical machine that reduces vibrations transmitted from a stator to a casing.

  A rotating electrical machine according to a first aspect is a rotating electrical machine including a rotor and a stator. The rotating electrical machine is provided around a casing that houses a rotor and a stator, a bolt that fastens the stator to the casing, and a shaft portion of the bolt between the stator and the casing. And a vibration absorbing member that absorbs vibration in a direction orthogonal to the rotation axis of the rotating electrical machine.

  According to the first aspect of the present invention, the vibration absorbing member (for example, around the shaft portion of the bolt and absorbing the vibration in the direction orthogonal to at least the rotation axis of the rotating electrical machine) between the stator and the housing. Shim laminate) is provided. During operation of the rotating electrical machine, a magnetic field is generated in the stator in response to power supply to the coils wound around the stator. A rotational force is developed in the rotor based on the magnetic field generated in the stator. At this time, a reaction force against the rotational force developed in the rotor is applied to the stator. For this reason, the stator vibrates based on the received reaction force. The vibration component generated according to the reaction force includes at least a component in a direction orthogonal to the rotation axis. Further, the vibration generated in the stator is transmitted not only to the casing via the contact surface between the stator and the casing but also to the casing via the bolt. By providing the vibration absorbing member around the bolt axis between the stator and the housing, the vibration of the stator transmitted through the bolt can be reduced by the vibration absorbing member. Therefore, since the vibration level at the resonance frequency can be reduced, noise generated during operation of the rotating electrical machine can be reduced. Therefore, it is possible to provide a rotating electrical machine that reduces vibrations transmitted from the stator to the housing.

  In the rotating electrical machine according to the second aspect of the invention, in addition to the configuration of the first aspect of the invention, the stator is provided separately from the housing via the vibration absorbing member.

  According to the second invention, the stator and the housing are in a separated positional relationship by providing a vibration absorbing member (for example, a shim laminate). Therefore, since the path for direct transmission from the stator to the housing is cut off, the vibration generated in the stator is transmitted to the housing via the bolts. Therefore, the vibration generated in the stator can be absorbed by providing the vibration absorbing member around the bolt axis and between the stator and the casing. Thereby, since the vibration level at the resonance frequency can be reduced, it is possible to reduce noise generated during operation of the rotating electrical machine.

  In the rotary electric machine according to the third invention, in addition to the configuration of the first or second invention, the vibration absorbing member is formed of a material that is not higher in rigidity than the material of the stator.

  According to the third invention, the vibration absorbing member is formed of a material that is not higher in rigidity than the material of the stator. Thereby, the vibration which generate | occur | produces in a stator can be absorbed with a vibration absorption member (for example, shim laminated body). Therefore, vibration transmitted to the housing can be reduced.

  In the rotating electrical machine according to the fourth aspect of the invention, in addition to the configuration of any one of the first to third aspects, the vibration absorbing member causes the stator and the housing to move relative to each other at least in the direction perpendicular to the rotation axis. It has an acceptable structure.

  According to the fourth invention, the vibration generated in the stator includes at least vibration in a direction orthogonal to the rotation axis. When the stator and the housing are allowed to move relative to each other in a direction perpendicular to the rotation axis by a vibration absorbing member (for example, a shim laminate), the stator and the housing are compared with the case where the stator and the housing are fixed. The transmitted vibration is reduced.

  In the rotating electrical machine according to the fifth aspect of the invention, in addition to the configuration of any one of the first to fourth aspects, the vibration absorbing member is formed by laminating a plurality of annular plate members.

  According to the fifth invention, the vibration generated in the stator includes at least vibration in a direction orthogonal to the rotation axis. By forming a plurality of ring-shaped flat plate members (for example, shims) by laminating them, slippage occurs between the contact surfaces of the flat plate members, thereby allowing relative movement in the direction perpendicular to the rotation axis between the stator and the housing. Allow. Thereby, compared with the case where a stator and a housing | casing are fixed, the vibration transmitted to a housing | casing is reduced.

  In the rotating electrical machine according to the sixth invention, in addition to the configuration of any one of the first to fifth inventions, the bolt is provided so as to penetrate the stator and the vibration absorbing member, and the shaft portion of the bolt is provided in the housing. It is concluded.

  According to the sixth invention, the bolt is provided so as to pass through the stator and the vibration absorbing member, and the bolt is transmitted from the stator to the casing by applying a fixing structure in which the shaft portion is fastened to the casing. Vibration can be absorbed by the vibration absorbing member.

  In the rotating electrical machine according to the seventh invention, in addition to the configuration of any one of the first to fifth inventions, the bolt is provided so as to penetrate the housing and the vibration absorbing member, and the shaft portion of the bolt is the stator. It is concluded.

  According to the seventh invention, the bolt is provided so as to penetrate the housing and the vibration absorbing member, and the shaft portion of the bolt is applied to the stator, and thereby, the bolt is transmitted from the stator to the housing. Vibration can be absorbed by the vibration absorbing member.

  In the rotating electrical machine according to the eighth aspect of the invention, in addition to the configuration of any one of the first to seventh aspects, the rotating electrical machine is mounted on a vehicle.

  According to the eighth invention, by applying the present invention to a vehicle on which a rotating electrical machine is mounted, vibration transmitted from the stator to the housing is reduced, so that noise generated during operation of the rotating electrical machine is also reduced. . Therefore, noise generated in the vehicle is reduced.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description, the same parts are denoted by the same reference numerals. Their names and functions are also the same. Therefore, detailed description thereof will not be repeated.

<First Embodiment>
As shown in FIG. 1, a rotating electrical machine 100 according to the present embodiment includes a stator 102, a motor case 104 that is a casing, and a rotor (not shown).

  The stator 102 has a hollow cylindrical shape. In the present embodiment, stator 102 is formed by laminating a plurality of electromagnetic steel plates along the rotation axis direction. In the stator 102, a plurality of teeth and slots (both not shown) are formed toward the axial center side. The plurality of slots are formed by grooves penetrating in a direction parallel to the rotation axis. The plurality of teeth are formed between the slots along a direction parallel to the rotation axis. A coil (not shown) is wound around each tooth.

  The rotor has a cylindrical shape and is inserted into a hollow portion inside the stator 102. The outer diameter of the rotor is at least smaller than the inner diameter inside the stator 102. The rotor is fixed to a rotating shaft (not shown). The rotating shaft is rotatably supported on the rotating shaft of the rotating electrical machine 100 by a bearing portion (not shown) provided in the motor case 104.

  The rotor is formed, for example, by inserting a permanent magnet in a direction parallel to the rotation axis with respect to a cylindrical laminated body in which a plurality of electromagnetic steel plates are laminated. A plurality of permanent magnets are inserted along the circumferential direction. In addition, it may replace with a permanent magnet and you may make it comprise a rotor using an electromagnet.

  The motor case 104 has a hollow cylindrical shape, and accommodates the stator 102 and the rotor in an inner hollow portion. The material of the motor case 104 is, for example, an aluminum alloy, but is not particularly limited thereto.

  The motor case 104 is formed with an attachment surface 106 that fixes the stator 102 to the inside. The mounting surface 106 has a smaller inner diameter than the outer diameter of the stator 102 and is a surface that is formed along the inner periphery of the motor case 104 and is orthogonal to the rotation axis. Three openings 110 having female screw portions are formed in the mounting surface 106. The openings 110 are formed at equal intervals in the circumferential direction around the rotation axis. The opening 110 may be a through hole that penetrates the motor case 104. The opening 110 is formed in the stepped portion 108 having a predetermined length along the axial direction with respect to the mounting surface 106. A shim laminate 202 is provided at the stepped portion 108. The shim laminate 202 is formed by laminating a plurality of shims, which are ring-shaped flat plates. The shim is not particularly limited as long as it is a material that is not at least stiffer than the material of the stator 102. For example, the shim may be made of the same material as that of the electromagnetic steel plate constituting the stator 102. This eliminates the need for insulation treatment on the shim laminate 202, and the thermal expansion coefficients are substantially the same, so that the occurrence of stress due to the different thermal expansion coefficients can be suppressed.

Further, the stator 102 is formed with protruding portions 112, 114, 116 having through holes 120, 122, 124 at positions corresponding to the three openings 110. FIG. 2 shows an arrow A in FIG. As shown in FIG. 2, protrusions 112, 114, 116 are provided on the outer edge of the stator 102 at equal intervals around the rotation axis along the circumferential direction. The protrusions 112, 114, 116 have a shape protruding in the radial direction.
The protrusions 112, 114, and 116 are formed along a direction parallel to the rotation axis. In addition, through holes 120, 122, and 124 are formed in the protrusions 112, 114, and 116 in a direction parallel to the rotation axis. A bolt 200 is inserted into each of the through holes 120, 122, and 124. The bolt 200 inserted into the stator 102 is fastened to the opening 110 formed in the attachment surface 106 through the shim laminate 202. In the present embodiment, it has been described that three openings 110 are formed on the mounting surface 106 and three protrusions 112, 114, 116 are formed on the stator 102. However, the present invention is not particularly limited to three. Absent.

  In such a rotating electric machine structure, when electric power is supplied to the coil wound around the stator 102, a magnetic field is generated in the stator 102. A magnetic flux flow is formed between the rotor and the stator 102 based on the generation of the magnetic field. And a rotational force expresses in a rotor by the flow of the formed magnetic flux. When a rotational force is developed in the rotor, the stator 102 receives a reaction force against the rotational force developed in the rotor. As a result, vibration is generated in the stator 102. When the vibration generated in the stator 102 is transmitted to the motor case 104, resonance between the stator 102 and the motor case 104 may occur, resulting in noise of the rotating electrical machine 100. In particular, in a relatively lightweight case such as an aluminum alloy, noise due to vibration generated in the stator 102 tends to increase.

  Accordingly, the present invention provides a vibration absorbing member that absorbs vibrations around the axis of the bolt 200 and between the stator 102 and the motor case 104 in a direction orthogonal to at least the rotation axis of the rotating electrical machine 100. It is characterized in that it is provided.

  In the present embodiment, the “vibration absorbing member” corresponds to the shim laminate 202. The vibration absorbing member is not particularly limited to the shim laminate 202 as long as it has a structure that allows relative movement at least in the direction orthogonal to the rotation axis.

  FIG. 3 shows a 3-3 cross section of FIG. As shown in FIG. 3, a shim laminate 202 is provided between the stator 102 and the motor case 104. A stepped portion 108 is formed on the mounting surface 106 of the motor case 104 so that the shim laminate 202 can be inserted. Preferably, the shape of the stepped portion 108 is not particularly limited as long as the through hole of the shim laminate 202 and the opening 110 can coincide with each other.

  The height of the stepped portion 108 (the length in the rotation axis direction) is substantially the same as the length of the shim laminate 202 in the direction in which the bolt 200 is inserted. When the bolt 200 is fastened, the stator 102 is supported by the contact surface with the motor case 104 (mounting surface) and the shim laminate 202.

  The bolt 200 may be fastened to a female screw portion of the opening 110 formed in the motor case 104. When the opening 110 is a through hole, the shaft portion of the bolt 200 is A nut corresponding to the bolt 200 may be fastened through the through hole.

  Alternatively, the bolt 200 may be passed through the motor case 104 and the shim laminate 202 and fastened to an opening provided in the stator 102 and having an internal thread portion corresponding to the bolt 200.

  As shown in FIG. 4, the shim laminate 202 is formed by laminating four disc-shaped shims 204, 206, 208, and 210 having a through hole in the center along the insertion direction of the bolt 200. The shim laminate 202 is not particularly limited to laminating the four shims 204, 206, 208, and 210. Moreover, it is not limited to a disk shape. For example, the shim may be a flat plate member having a rectangular through hole in the center. Further, the through holes of the shims 204, 206, 208, and 210 are not particularly limited as long as the shaft portions of the bolts 200 can be inserted. For example, the shims 204, 206, 208, and 210 are not limited. A predetermined distance may be provided between the through hole and the shaft portion of the bolt 200.

  The operation based on the structure of the rotating electrical machine 100 as described above will be described. When the stator 102 is fastened to the motor case 104 by the bolts 200, the stator 102 is supported by the shim laminate 202 and the contact surface (shaded portion) between the motor case 104 and the stator 102 as shown in FIG.

  When electric power is supplied to the coil wound around the stator 102 and a rotational force is developed in the rotor, the stator 102 receives a reaction force with respect to the rotational force developed in the rotor. When the rotating electrical machine 100 is operated, the stator 102 vibrates by this reaction force. The vibration component at this time includes at least a component in a direction orthogonal to the rotation axis. Therefore, the vibration transmitted to the shim laminate 202 is caused by slippage (friction) due to slippage on the contact surface between the shims when the stator 102 and the motor case 104 move relative to each other in the direction perpendicular to the rotation axis. It is converted to heat and absorbed by

  The direction orthogonal to the rotation axis is, for example, the direction around the axis of the bolt 200, the radial direction of the stator 102, and the circumferential direction of the stator 102, but is not particularly limited thereto.

  As described above, the shim laminate 202 is provided between the stator 102 and the motor case 104, and the shim laminate 202 is formed by laminating a plurality of shims. The level of vibration at the resonance frequency is reduced by causing a change such as lowering the spring stiffness between the two. While the rotating electrical machine 100 is in operation, slippage in the shim laminate 202 always occurs, so that vibration is always absorbed.

  As described above, according to the rotating electrical machine according to the present embodiment, the vibration generated in the stator in accordance with the reaction force includes at least a component in the direction orthogonal to the rotation axis. The vibration generated in the stator is transmitted not only to the motor case via the contact surface between the stator and the motor case, but also to the motor case via the bolt. By providing the shim laminate around the bolt axis and between the stator and the motor case, the vibration of the stator transmitted through the bolt can be reduced by the shim laminate. Therefore, since the vibration level at the resonance frequency can be reduced, noise generated during operation of the rotating electrical machine can be reduced. Therefore, it is possible to provide a rotating electrical machine that reduces vibrations transmitted from the stator to the housing.

  The rotating electrical machine as described above is mounted on a vehicle. In this way, noise generated during operation of the rotating electrical machine is reduced, so that noise generated in the vehicle is also reduced.

<Second Embodiment>
The rotating electrical machine according to the second embodiment of the present invention will be described below. The rotating electrical machine according to the present embodiment is different from the rotating electrical machine 100 according to the first embodiment described above in that a motor case 404 is included instead of the motor case 104. The other configuration is the same as the configuration of the rotating electrical machine according to the first embodiment described above. They are given the same reference numerals. Their functions are the same. Therefore, detailed description thereof will not be repeated here.

  As shown in FIG. 6, the motor case 404 is different from the motor case 104 of the rotating electrical machine 100 according to the first embodiment described above in that the stepped portion 108 is not formed on the mounting surface 106.

  FIG. 7 shows an arrow B in FIG. As shown in FIG. 7, the structure of the stator 102 is formed with protruding portions 112, 114, and 116 similarly to the stator 102 of the rotating electrical machine 100 according to the first embodiment described above.

  FIG. 8 shows an 8-8 cross section of FIG. As shown in FIG. 8, since the stepped portion is not formed on the mounting surface 106, the shim laminate 202 is provided between the stator 102 and the motor case 404, so that the stator 102 is connected to the motor via the shim laminate 202. It is provided apart from the case 404.

  In the present embodiment, the stator 102 and the motor case 404 may be provided separated from each other by the shim laminate 202. Therefore, in the state after the bolt 200 is fastened, a stepped portion that is at least shorter than the length of the shim laminate 202 in the axial direction of the bolt 200 may be formed on the mounting surface 106.

  The operation based on the structure of the rotating electrical machine 100 as described above will be described. When the stator 102 is fastened to the motor case 404 by the bolt 200, the stator 102 is supported by the shim laminate 202.

  When electric power is supplied to the coil wound around the stator 102 and a rotational force is developed in the rotor, the stator 102 receives a reaction force with respect to the rotational force developed in the rotor. When the rotating electrical machine 100 is operated, the stator 102 vibrates by this reaction force. The vibration component at this time includes at least a component in a direction orthogonal to the rotation axis. Therefore, the vibration transmitted to the shim laminate 202 is caused by slippage (friction) due to slippage on the contact surface between the shims when the stator 102 and the motor case 104 move relative to each other in the direction perpendicular to the rotation axis. It is converted to heat and absorbed by

  The direction orthogonal to the rotation axis is, for example, the direction around the axis of the bolt 200, the radial direction of the stator 102, and the circumferential direction of the stator 102, but is not particularly limited thereto.

  In particular, as compared with the rotating electrical machine 100 according to the first embodiment, the vibration path caused by direct contact with the stator 102 from the motor case 104 is blocked. Therefore, as shown in FIG. 9, the spring element 300 and the damper element 302 are cut off due to the contact between the stator 102 and the motor case 104.

  As described above, the stator 102 and the motor case 104 are separated from each other by the shim laminate 202, and the shim laminate 202 is formed by laminating a plurality of shims, so that the stator 102 and the motor case 104 are separated. The level of vibration at the resonance frequency is reduced by causing a change such as lowering the spring rigidity. While the rotating electrical machine 100 is in operation, slippage in the shim laminate 202 always occurs, so that vibration is always absorbed.

  As described above, according to the rotating electrical machine according to the present embodiment, in addition to the same effects as those of the rotating electrical machine according to the first invention described above, the stator and the motor case do not contact each other. The transmission path of direct vibration is cut off, and the vibration of the stator is transmitted only through the shim stack. Therefore, during the operation of the rotating electrical machine, the shim stack can cause slippage in the direction orthogonal to the rotation axis, and reduce vibration transmitted to the motor case.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, 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 the structure of the stator and motor case of the rotary electric machine which concerns on 1st Embodiment. It is an external view of a stator and a motor case viewed from an arrow A. FIG. 3 is a 3-3 cross section of FIG. 2. It is an external view of a shim laminated body. It is a figure which shows the contact surface of a stator and a motor case. It is a figure which shows the structure of the stator and motor case of the rotary electric machine which concerns on 2nd Embodiment. It is an external view of a stator and a motor case as viewed from an arrow B. FIG. 8 is an 8-8 cross section of FIG. 7. It is a figure which shows the equivalent dynamic model of the stator and motor case in which the shim laminated body was provided.

Explanation of symbols

  100 rotating electrical machine, 102 stator, 104, 404 motor case, 106 mounting surface, 108 stepped portion, 110 opening, 112, 114, 116 protruding portion, 120, 122, 124 through hole, 200 bolt, 202 shim laminate, 204 206, 208, 210 shims, 300 spring elements, 302 damper elements.

Claims (8)

A rotating electric machine comprising a rotor and a stator,
A housing for housing the rotor and the stator;
A bolt for fastening the stator to the housing;
A vibration absorbing member provided around the shaft portion of the bolt and provided between the stator and the casing and absorbing vibrations of the stator in a direction orthogonal to at least a rotation axis of the rotating electrical machine; , Rotating electrical machinery.   The rotating electrical machine according to claim 1, wherein the stator is provided separately from the housing via the vibration absorbing member.   The rotating electrical machine according to claim 1, wherein the vibration absorbing member is formed of a material that is not higher in rigidity than a material of the stator.   4. The rotating electrical machine according to claim 1, wherein the vibration absorbing member has a structure in which the stator and the housing allow relative movement in at least a direction orthogonal to the rotation axis.   5. The rotating electrical machine according to claim 1, wherein the vibration absorbing member is formed by laminating a plurality of annular plate members.   The rotating electrical machine according to claim 1, wherein the bolt is provided so as to penetrate the stator and the vibration absorbing member, and a shaft portion of the bolt is fastened to the housing.   The rotating electrical machine according to claim 1, wherein the bolt is provided so as to penetrate the housing and the vibration absorbing member, and a shaft portion of the bolt is fastened to the stator.   The rotating electrical machine according to claim 1, wherein the rotating electrical machine is mounted on a vehicle.

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