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Stator for Electric Rotating Machine

  • US 20120019096A1
  • Filed: 06/15/2011
  • Published: 01/26/2012
  • Est. Priority Date: 07/20/2010
  • Status: Abandoned Application
First Claim
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1. A stator for an electric rotating machine, the stator comprising a stator core that includes an annular back yoke portion, a plurality of tooth portions and a plurality of slots, each of the tooth portions extending radially inward from a radially inner periphery of the back yoke portion, the tooth portions being arranged in a circumferential direction of the back yoke portion at predetermined intervals, each of the slots being formed between a circumferentially-adjacent pair of the tooth portions,whereinthe stator core is comprised of first and second stator core pieces that are arranged to overlap each other in an axial direction of the back yoke portion of the stator core,the first stator core piece includes a plurality of first protrusions and a plurality of first slot opening portions, each of the first protrusions being formed on a first circumferential side of a corresponding one of the tooth portions of the stator core so as to protrude from a distal end part of the corresponding tooth portion in the circumferential direction, each of the first slot opening portions being formed between a circumferentially-adjacent pair of one of the first protrusions and one of the distal end parts of the tooth portions of the stator core so as to extend in the axial direction, each of the first slot opening portions communicating with a corresponding one of the slots of the stator core and opening on a radially inner surface of the first stator core piece,the second stator core piece includes a plurality of second protrusions and a plurality of second slot opening portions, each of the second protrusions being formed on a second circumferential side of a corresponding one of the tooth portions of the stator core so as to protrude from the distal end part of the corresponding tooth portion in the circumferential direction, the second circumferential side being opposite to the first circumferential side for each of the tooth portions of the stator core, each of the second slot opening portions being formed between a circumferentially-adjacent pair of one of the second protrusions and one of the distal end parts of the tooth portions of the stator core so as to extend in the axial direction, each of the second slot opening portions communicating with a corresponding one of the slots of the stator core and opening on a radially inner surface of the second stator core piece, andfor each of the slots of the stator core, the corresponding pair of the first and second slot opening portions which communicate with the slot are offset from each other in the circumferential direction of the back yoke portion of the stator core.

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