JP2011155738A - Stator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a stator that improves at least one of: degree of freedom where a stator is mounted on a motor case; a pressure by which division core is fastened; strength by which the motor case is mounted; deep drawing of plate materials; and change of metal structure caused by extension of the plate material at the deep drawing, or the like. <P>SOLUTION: The stator 12 includes: a plurality of division cores 28 that are disposed neighboring to each other; and an outer cylindrical ring 32 that is mounted around the division core 28. The outer cylindrical ring 32 has: a first division outer cylindrical ring 32b that is divided in an axial direction; and a second division cylindrical ring 32b. Flanges 34 that are ubiquitous in a radial direction and face each other is disposed at an end in the axial direction of the first and second division cylindrical ring 32a and 32b. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a stator used in a rotating electrical machine such as an electric motor or a generator.

  A rotating electrical machine mounted on a vehicle such as an automobile has a rotor and a stator disposed around the rotor. The stator includes a split core disposed adjacent to each other and an outer cylinder ring attached to the outer periphery of the split core (for example, Patent Documents 1 to 4).

  FIG. 5 is a perspective view showing a configuration of a conventional outer cylinder ring. As shown in FIG. 5, a flange portion 42 for fastening the rotating electrical machine to the motor case is provided at one end of the outer cylinder ring 40 in the axial direction.

JP 2009-131006 A JP 2009-142031 A JP 2004-236440 A JP 2006-109672 A

  If the flange portion 42 is provided at one end in the axial direction as in the outer ring 40 shown in FIG. 5, the degree of freedom of shape is low, and the degree of freedom of mounting the rotating electrical machine on the motor case is reduced. Further, since the outer cylinder ring 40 is generally manufactured by deep drawing, the thickness of the outer cylinder ring 40 becomes thinner toward the end opposite to the flange portion 42, and the split core Tightening pressure decreases. Further, in the manufacturing method by deep drawing, the thickness of the flange portion 42 is equal to or less than the thickness of the plate material to be molded, so it is difficult to secure the axial force of the bolt, and the attachment strength to the motor case is reduced. Further, since the axial length of the outer ring 40 is determined by the deep drawability of the material of the plate material, it cannot be drawn out long (deeply) depending on the material of the plate material. Further, in deep drawing of the plate material, since the portion to be the flange portion 42 is fixed and deep drawing is performed, a change in the metal structure due to the elongation of the plate material becomes large (cracking occurs).

  An object of the present invention is to provide a stator that solves at least one of the above problems.

  The present invention is a stator including a plurality of divided cores arranged adjacent to each other and an outer cylinder ring attached to the outer periphery of the divided core, wherein the outer cylinder ring is divided into at least two in the axial direction. The first divided outer cylinder ring and the second divided outer cylinder ring are provided, and one end in the axial direction of the first divided outer cylinder ring and the second divided outer cylinder ring extends in the radial direction and faces each other. Provide a flange part.

  In the stator, it is preferable that a spacer member is disposed between a flange portion of the first divided outer cylinder ring and a flange portion of the second divided outer cylinder ring.

  Moreover, in the stator, it is preferable that a cylindrical member is disposed between the outer cylindrical ring and the divided core.

  According to the present invention, at least among the degree of freedom of mounting on the motor case, the clamping pressure of the split core, the mounting strength to the motor case, the deep drawing of the plate material, the change in the metal structure due to the elongation of the plate material during the deep drawing, etc. Any one can be improved.

It is a schematic cross section which shows an example of a structure of the rotary electric machine which concerns on this embodiment. It is a model perspective view which shows an example of a structure of a stator core. It is a schematic cross section which shows another example of a structure of the outer cylinder ring of this embodiment. It is a schematic cross section which shows another example of a structure of the outer cylinder ring of this embodiment. It is a perspective view which shows the structure of the conventional outer cylinder ring.

  Embodiments of the present invention will be described below.

  FIG. 1 is a schematic cross-sectional view showing an example of the configuration of the rotating electrical machine according to the present embodiment. A rotating electrical machine 1 shown in FIG. 1 is a motor mounted on a vehicle such as a hybrid vehicle or an electric vehicle. The rotating electric machine means a motor generator having at least one of a function as a motor and a function as a generator (generator) when electric power is supplied.

  A rotating electrical machine 1 shown in FIG. 1 is housed in a motor case (not shown), and is installed in a rotor 10 rotatably supported by a bearing (not shown) provided in the motor case, and in the outer circumferential direction of the rotor 10. The stator 12 is provided.

  The rotor 10 has a rotor core 14 and permanent magnets (not shown) embedded in the rotor core 14 and rotates around a rotor shaft 16 supported by bearings. End plates 18 are provided on both axial end surfaces of the rotor core 14.

  The rotor core 14 has a cylindrical shape along the rotor shaft 16 and is composed of a plurality of electromagnetic steel plates 20a stacked in the axial direction. A plurality of permanent magnets (not shown) are embedded in the outer peripheral portion of the rotor core 14 at equal angles.

  The stator 12 includes a cylindrical stator core 26 and is disposed to face the rotor 10 via a predetermined gap. FIG. 2 is a schematic perspective view showing an example of the configuration of the stator core. As shown in FIG. 2, the stator core 26 is a set of a plurality of divided cores 28 arranged adjacent to each other. The number of divided cores 28 is not particularly limited.

  As shown in FIG. 1, a coil end 30 formed in the circumferential direction is disposed at the end of the stator core 26. A slot is formed in the stator core 26 so as to penetrate the stator 12 in the axial direction, and a coil is wound around the slot. The end of the coil wound around the stator core 26 is formed as a coil end 30. The stator core 26 is composed of a plurality of electromagnetic steel plates 20b stacked in the axial direction, but is not necessarily limited thereto, and may be composed of, for example, a dust core.

  Although not shown, the coil end 30 is electrically connected to the control device by a three-phase cable including a U-phase cable, a V-phase cable, and a W-phase cable, and is mounted on a vehicle such as a hybrid vehicle. A torque command value to be output by the rotating electrical machine 1 is sent from an ECU (Electrical Control Unit). Then, the control device generates a motor control current for outputting the torque designated by the torque command value, and the motor control current is supplied to the coil end 30 via the three-phase cable.

  The stator 12 of this embodiment includes an outer cylinder ring 32 shown in FIG. The outer cylinder ring 32 is attached to the outer periphery of the split core 28 constituting the stator core 26. More specifically, the outer peripheral portion of the split core 28 constituting the stator core 26 is fitted on the inner peripheral side of the outer cylinder ring 32. As a method of this fitting, it is press fitting or shrink fitting. In the press-fitting, the split core 28 is fitted on the inner peripheral side of the outer cylinder ring 32 without particularly heating the outer cylinder ring 32. On the other hand, in shrink fitting, the outer cylinder ring 32 is heated to expand the outer cylinder ring 32, the split core 28 is fitted into the expanded outer cylinder ring 32, and then the outer cylinder ring 32 is cooled. Thus, the outer cylinder ring 32 contracts, and the contracted outer cylinder ring 32 applies compressive stress to the split core 28.

  As shown in FIG. 1, the outer cylinder ring 32 of this embodiment has the 1st division | segmentation outer cylinder ring 32a and the 2nd division | segmentation outer cylinder ring 32b at least divided into 2 by the axial direction. And the flange part 34 extended in radial direction and mutually opposing is provided in the axial direction one end of the 1st division | segmentation outer cylinder ring 32a and the 2nd division | segmentation outer cylinder ring 32b. The flange portion 34 protrudes in the outer peripheral direction. Although not shown, the flange portion 34 is provided with a plurality of bolt holes. By passing the bolts through the bolt holes and engaging the bolts with the motor case, the outer cylinder ring 32 is attached to the motor case. It can be attached.

  The first divided outer cylinder ring 32a and the second divided outer cylinder ring 32b perform a deep drawing process with a predetermined drawing ratio on a plate material such as a metal plate on a held disc using a press machine or the like. It is manufactured by. And the part which hold | maintains a board | plate material becomes the flange part 34 in the case of deep drawing.

  The produced first divided outer cylinder ring 32a and second divided outer cylinder ring 32b are fitted on the outer periphery of the divided core 28 constituting the stator core 26 as described above. The first divided outer cylinder ring 32a and the second divided outer cylinder ring 32b may be fitted to the outer periphery of the divided core 28 so that the flange portions 34 are in contact with each other, and as shown in FIG. You may fit in the outer periphery of the split core 28 so that it may be vacant. The outer cylinder ring 32 of the present embodiment includes an outer cylinder ring divided into at least two or more, and the manufacturing method, the fitting method to the divided core 28, and the like are the same as the conventional methods. Can be used.

  As in the present embodiment, by dividing the outer cylinder ring 32, the depth of the deep drawing of one outer cylinder ring can be reduced, so that the change in the metal structure due to the elongation of the plate material during the deep drawing process can be reduced. It can be made smaller (dimensional stabilization, prevention of cracking, etc.). Moreover, since the flange part 34 of the 1st division | segmentation outer cylinder ring 32a and the 2nd division | segmentation outer cylinder ring 32b is mutually opposingly arranged, the thickness of the flange part 34 is thicker than the thickness of the surrounding wall of the outer cylinder ring 32 (2). Therefore, the mounting strength to the motor case can be greatly improved and the axial force of the bolt can be sufficiently secured.

  In the present embodiment, the flanges when the outer cylinder ring 32 is fitted to the divided core 28 are changed by changing the depth of the deep drawing of the first divided outer cylinder ring 32a and the second divided outer cylinder ring 32b. Since the position can be freely set in the axial direction, the degree of freedom of mounting on the motor case is increased.

  FIG. 3 is a schematic cross-sectional view showing another example of the configuration of the outer cylinder ring of the present embodiment. The outer cylinder ring 32 shown in FIG. 3 includes a first divided outer cylinder ring 32a and a second divided outer cylinder ring 32b that are divided at least in the axial direction in the same manner as the outer cylinder ring 32 shown in FIG. An annular spacer 36 provided between the flange portion 34 of the cylindrical ring 32a and the flange portion 34 of the second divided outer cylindrical ring 32b. The annular spacer 36 is manufactured by punching the center part of a plate material such as a metal plate on a circular plate using a punching machine or the like.

  As in this embodiment, by providing the spacer 36 between the flange portion 34 of the first divided outer cylinder ring 32a and the flange portion 34 of the second divided outer cylinder ring 32b, the thickness of the flange portion 34 can be reduced. Since the cylindrical ring 32 can be made thicker (more than twice) than the thickness of the flange portion 34 when the cylinder ring 32 is divided into two parts, the mounting strength to the motor case can be further improved, and the portion of the bolt neck that is not screwed together By ensuring this, the axial force of the bolt can be more sufficiently secured.

  FIG. 4 is a schematic cross-sectional view showing another example of the configuration of the outer cylinder ring of the present embodiment. An outer cylinder ring 32 shown in FIG. 4 includes a first outer cylinder ring 32 and a second outer cylinder ring 32 that are divided at least in the axial direction, a flange portion 34 of the first divided outer cylinder ring 32a, and a second divided outer cylinder. An annular spacer 36 provided between the flange portion 34 of the ring 32 b and a cylindrical member 38 provided between the inner peripheral side of the outer cylindrical ring 32 and the outer peripheral side of the split core 28 are provided.

  As in the present embodiment, the cylindrical member 38 is provided between the inner peripheral side of the outer cylindrical ring 32 and the outer peripheral side of the split core 28, thereby making it possible to manufacture without considering the R at the inner peripheral side corner of the flange portion 34. Therefore, the productivity of the outer cylinder ring 32 can be improved. In addition, since the cylindrical member 38 can use an electric sewing tube or the like, it is not necessary to manufacture it by deep drawing. Furthermore, since the divided core 28 is mainly tightened by the cylindrical member 38, the design accuracy of the outer cylinder ring 32 such as the first divided outer cylinder ring 32a and the second divided outer cylinder ring 32b (for example, a divided portion of the outer cylinder) A constant tightening force of the split core 28 can be ensured without being affected by the difference in level of the difference.

  DESCRIPTION OF SYMBOLS 1 Rotating electrical machine, 10 Rotor, 12 Stator, 14 Rotor core, 16 Rotor shaft, 18 End plate, 20a, 20b Electromagnetic steel plate, 26 Stator core, 28 Split core, 30 Coil end, 32 Outer cylinder ring, 32a First split outer cylinder ring , 32b Second split outer ring, 34 flange, 36 spacer, 38 cylindrical member, 40 outer ring, 42 flange.

Claims (3)

A stator comprising a plurality of split cores arranged adjacent to each other, and an outer cylinder ring attached to the outer periphery of the split core,
The outer cylinder ring includes a first divided outer cylinder ring and a second divided outer cylinder ring that are divided at least in the axial direction, and one axial end of the first divided outer cylinder ring and the second divided outer cylinder ring. Has a flange portion extending in the radial direction and facing each other.   2. The stator according to claim 1, wherein a spacer member is installed between a flange portion of the first divided outer cylinder ring and a flange portion of the second divided outer cylinder ring.   The stator according to claim 2, wherein a cylindrical member is installed between the outer cylinder ring and the divided core.

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