JP2008245352A - Rotary electric machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotary electric machine that can further reduce vibration and noise. <P>SOLUTION: The rotary electric machine 10 includes a housing 40, which accommodates a rotor 20 and a stator 30, and a cover 50, which closes an opening portion 42 of the housing 40. An end plate member 70 is made to contact the end surface at the opening portion 42 side of the stator 30. A bolt 80 is inserted from an opening at the opening portion 42 side of a hole 72 formed in the end plate member 70 to one opening of a through hole 32 and its top end protruding from the other opening of the through hole 32 is fixed to the bottom portion 44 of the housing 40. A bolt 90 is inserted from an opening outside the cover of a hole 52 formed in the cover 50 and its top end protruding from the other opening of the hole 52 is fixed to the end plate member 70. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a rotating electrical machine.

  In recent years, there has been a high demand for calmness in passenger compartments as vehicles are upgraded. There is a high demand for quietness even in electric vehicles equipped with a motor as a drive source, such as an electric vehicle, a hybrid electric vehicle, and a fuel cell vehicle, and there is also a high demand for reducing noise generated in the motor mounted on the electric vehicle.

  In Patent Document 1, in a rotating electrical machine including a rotor, a stator arranged around the rotor, a housing that houses the stator, and a lid attached to the housing, the stator is fixed to the housing with a bolt, and the stator A technique for attenuating transmission of vibrations of the stator to the housing by inserting a damping member in the gap between the housing and the housing is disclosed.

  In Patent Document 2, in a rotating electrical machine used as a generator, an electric motor, or the like, a pressing plate having a through hole is similarly attached to both sides of an electromagnetic steel plate having a through hole, and a female screw or a male screw is attached to both ends of the through hole. A technique for inserting a formed metal pin and fixing a stator core with a bolt or nut from the outside of a pressing plate is disclosed.

JP 2006-166554 A JP 2006-60954 A

  By the way, when an electromagnetic force acting on the stator acts in the radial direction, vibration may be generated in the radial direction along the outer periphery of the stator, and the stator may expand and contract in the radial direction. However, when a damping member is inserted into the gap between the stator and the housing as in Patent Document 1, vibrations accompanying expansion and contraction in the radial direction of the stator may be directly transmitted to the housing via the damping member. .

  Further, a motor mounted on an electric vehicle or the like is often used in a sealed structure in order to withstand an environment such as dust and moisture. However, as in Patent Document 2, in the case of a motor in which press plates are attached to both sides of an electromagnetic steel plate and the stator is fixed, it is necessary to ensure hermeticity on both sides of the electromagnetic steel plate. In many cases, it is difficult to ensure the sealing performance as compared with a rotating electric machine in which the housing is sealed with a lid.

  An object of this invention is to provide the rotary electric machine which can reduce a vibration and noise more.

  A rotating electrical machine according to the present invention includes a rotor, a stator disposed around the rotor, a housing having an opening in one of the rotation axis directions of the rotor, and housing the rotor and the stator, and the housing A cover for closing the opening, a first fixing member for fixing the stator to the bottom surface of the housing facing the opening, and a second fixing member for fixing the stator to the cover. It is characterized by providing.

  One aspect of the rotating electrical machine according to the present invention includes an end plate member disposed on an end surface of the stator on the opening side, and the first fixing member and the second fixing member each include the end plate member. The stator is fixed via.

  In one aspect of the rotating electrical machine according to the present invention, the stator has a through hole along a rotation axis direction on an outer peripheral portion thereof, and the end plate member has an end plate hole at a position facing the through hole. And the cover has a cover hole at a position that does not overlap the end plate hole, and the first fixing member is fixed to the bottom surface of the housing through the end plate hole and the through hole, The second fixing member is inserted into the cover hole and fixed to the end plate member.

  In one aspect of the rotating electrical machine according to the present invention, the first fixing member is inserted into one opening of the through hole from the opening on the opening portion side of the end plate hole and protrudes from the other opening of the through hole. The second fixing member is inserted into the cover hole from the opening outside the cover, and protrudes from the other opening of the cover hole to the end plate member. It is fixed.

  In one aspect of the rotating electrical machine according to the present invention, the second fixing member is disposed on a plane including the first fixing member and the rotating shaft.

  In one aspect of the rotating electrical machine according to the present invention, the end plate member is made of a non-magnetic material.

  According to the present invention, since the stator is fixed to the housing and the cover, noise due to vibration of the stator or the like can be further reduced.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, an embodiment specifically showing the best mode for carrying out the invention will be described with reference to the drawings.

  FIG. 1 is a cross-sectional view of a rotating electrical machine 10 according to the present embodiment.

  In FIG. 1, the rotating electrical machine 10 is attached to an opening 42 of the rotor 20, a stator 30 disposed around the rotor 20, a housing 40 that houses the rotor 20 and the stator 30, and an opening 42 of the housing 40. And a cover 50 for closing.

  The rotor 20 includes a hollow shaft 22 that is a rotating shaft, a rotor core that is attached to the periphery of the shaft 22, and a permanent magnet that is inserted into a hole provided in the rotor core. The rotor core includes a plurality of laminated electromagnetic steel plates and is pressed by pressing plates from both sides.

  Stator 30 includes a stator core and a coil wound around the stator core. The stator core includes a plurality of laminated electromagnetic steel plates.

  The housing 40 has a substantially cylindrical shape formed by plastic processing such as pressing a steel plate or the like, and has an opening 42 on one side in the rotation axis direction O. A cover 50 in which an aluminum alloy is cast in a substantially hollow cylindrical shape by die casting or the like is brought into contact with the outer peripheral portion of the opening 42 to close the opening 42.

  Ball bearings 60 and 62 are fixed to the bottom 44 and the cover 50 facing the opening 42 of the housing 40, respectively. The ball bearings 60 and 62 are rotatably supported with the shaft 22 being press-fitted and fixed.

  Further, a substantially hollow circular end plate member 70 is brought into contact with the end face on the opening 42 side of the stator 30, and three bolts 80 as first fixing members are interposed via the end plate member 70. Is fixed to the bottom 44 of the housing 40. Further, the three bolts 90 as the second fixing members fix the stator 30 to the cover 50 via the end plate members 70.

  FIG. 2 is a perspective view of the stator 30 and the end plate member 70. As shown in FIG. 2, through holes 32 a, 32 b, 32 c through which the respective bolts 80 are inserted along the rotation axis direction O (hereinafter, when there is no need to distinguish between, the through holes 32 are provided in the outer periphery of the stator 30. The same applies to the holes 72 and 74 shown below) formed on the same arc at equal intervals in the circumferential direction, and the end plate member 70 is opposed to the through holes 32a, 32b, and 32c. Similarly, holes 72a, 72b, 72c through which the respective bolts 80 are inserted are formed at the positions. In addition, holes 74a, 74b, 74c through which the bolts 90 are inserted are formed at equal intervals on the same arc at the phase positions different from those of the holes 72a, 72b, 72c. The cover 50 is formed with holes 52 through which the bolts 90 are inserted at positions facing the holes 74.

  In this embodiment, an example in which three bolts 80 and three bolts 90 are used will be described. However, the number of bolts that fix the stator 30 is not limited to the number.

  Each bolt 90 is preferably arranged one by one with respect to each bolt 80, and each bolt 90 is preferably arranged on a plane including a pair of bolts 80 and the rotation axis O. That is, the hole 74 formed in the end plate member 70 is preferably formed on a straight line including the hole 72 and orthogonal to the rotation axis O.

  Further, in the present embodiment, the end plate member 70 is substantially circular, but the stator 30 is fastened to the housing 40 and the cover 50 via the end plate member 70 using a fixing member such as a bolt 80 or a bolt 90. Therefore, the end plate member 70 may have another shape such as a rectangular shape.

  The bolt 80 is inserted into one opening of the through hole 32 from the opening on the opening 42 side of the hole 72, and is fastened to the bottom 44 of the housing 40 at the tip protruding from the other opening of the through hole 32.

  The bolt 90 is inserted from the opening on the outside of the cover 50 in the hole 52, inserted into the hole 74 at the tip protruding from the opening on the inside of the cover 50 in the hole 52, and fastened to the end plate member 70.

  As described above, the stator 30 is fastened to the cover 50 together with the housing 40 via the end plate member 70. Therefore, the vibration amplitude of the stator 30 can be made smaller and the natural frequency of the rotating electrical machine 10 can be made higher than when fixed to either the cover 50 or the housing 40. Therefore, noise generated from the rotating electrical machine 10 due to the vibration of the stator 30 can be suppressed.

  In the present embodiment, the end plate member 70 may be made of a nonmagnetic material such as resin or a nonmagnetic metal. Here, by configuring the end plate member 70 with a non-magnetic material, it is possible to prevent the magnetic flux (leakage magnetic flux) from the stator 30 from being transmitted. Therefore, the power loss of the rotating electrical machine 10 can be reduced, or the heat generated from the rotating electrical machine 10 can be suppressed.

  Further, the end plate member 70 is made of a high elastic modulus member such as a composite material of resin and nonmagnetic metal, or a part of the end plate member 70, for example, a portion that contacts the stator 30 has a high elastic modulus. By constituting with this member, it is possible to suppress the vibration of the stator 30 from being transmitted to the cover 50 via the bolt 90.

It is a section lineblock diagram of the rotation electrical machinery concerning this embodiment. It is a perspective view of the stator and end plate member which comprise the rotary electric machine which concerns on this embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 Rotating electrical machine, 20 Rotor, 22 Shaft, 30 Stator, 32a, 32b, 32c Through-hole, 40 Housing, 42 Opening part, 44 Bottom part, 50 Cover, 52 hole, 60, 62 Ball bearing, 70 End plate member, 72a, 72b, 72c holes, 74a, 72b, 72c holes, 80, 90 volts.

Claims (6)

The rotor,
A stator disposed around the rotor;
A housing having an opening in one of the rotation axis directions of the rotor, and housing the rotor and the stator;
A cover for closing the opening of the housing;
A first fixing member for fixing the stator to the bottom surface of the housing facing the opening;
A second fixing member for fixing the stator to the cover;
A rotating electrical machine. In the rotating electrical machine according to claim 1,
An end plate member disposed on an end surface of the stator on the opening side;
The first fixing member and the second fixing member each fix the stator via the end plate member,
Rotating electric machine characterized by that. The rotating electrical machine according to claim 2,
The stator has a through hole along the rotation axis direction on the outer periphery thereof,
The end plate member has an end plate hole at a position facing the through hole,
The cover has a cover hole at a position not overlapping the end plate hole,
The first fixing member is fixed to the bottom surface of the housing through the end plate hole and the through hole,
The second fixing member is fixed to the end plate member through the cover hole;
Rotating electric machine characterized by that. In the rotating electrical machine according to claim 3,
The first fixing member is fixed to the bottom surface of the housing at a tip that is inserted into one opening of the through hole from the opening on the opening portion side of the end plate hole and protrudes from the other opening of the through hole,
The second fixing member is inserted from an opening outside the cover hole of the cover hole, and fixed to the end plate member at a tip protruding from the other opening of the cover hole.
Rotating electric machine characterized by that. In the rotating electrical machine according to any one of claims 1 to 4,
The second fixing member is disposed on a plane including the first fixing member and the rotation shaft.
Rotating electric machine characterized by that. In the rotating electrical machine according to any one of claims 2 to 5,
The end plate member is made of a nonmagnetic material.
Rotating electric machine characterized by that.