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Stator-core-of-vehicle-rotary-electric-machine-and-method-of-manufacturing-the-same

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Stator core of vehicle rotary electric machine and method of manufacturing the same

Details

Inventors: Nakamura, Shigenobu;
Assignee: Denso Corporation (Kariya, JP)
Primary Examiner: Ramirez; Nestor
Assistant Examiner: Perez; Guillermo
Attorney, Agent or Firm: Oliff & Berridge, PLC

Each tooth of a stator core has circumferential projections at an inner tooth edge and circumferential notches at a base portion adjacent to a core back. A width of the teeth at the base portion is larger than a width of the same at the tooth edge. Therefore, the magnetic reluctance of the teeth does not increase. In addition, a plurality of the magnetic strips can be formed from a long and thin magnetic sheet. This increases the yield percentage of the magnetic strip and reduces a manpower of manufacturing the magnetic strip. Further, the notches make it easy to wind the magnetic strip into a cylindrical core.

DETAILED DESCRIPTION Therefore, a main object of the invention is to provide a powerful and inexpensive vehicle rotary electric machine having a stator core that is free from the above problems.
In other words, the invention is to provide a stator core of a powerful vehicle rotary machine that can be manufactured at a high yield percentage and a high speed.
In more detail, the invention is to improve the yield percentage of the magnetic strip forming the stator core, to reduce manpower of manufacturing the magnetic strip, to reduce the magnetic reluctance of the stator core and to improve the space factor of the conductor coils.
According to a main feature of the invention, each of teeth of the stator core has at least a circumferential projection at a tooth edge thereof and at least a circumferentially extending notch at a base portion thereof, and a circumferential width of the teeth at the base portion is wider than a circumferential width of the teeth at the tooth edge from which the circumferential projection extends.
According to the above structure, the cross-section of the teeth at the middle thereof is not narrower than the cross-section at the base thereof.
This shape prevents the magnetic reluctance thereof from increasing.
In addition, it is possible to manufacture a plurality of magnetic strips from a long magnetic sheet.
As a result, the yield percentage of the magnetic strip can be improved and the manpower for manufacturing the magnetic strip can be reduced.
In addition, the magnetic strip can be wound easily because of the notches.
According to another feature of the invention, the notch and projection are complementary to each other in shape before the magnetic strip is spirally wound, and the radial width of the notch is reduced after the strip is wound.
Therefore, the yield percentage of the magnetic strip is drastically improved.
Because the radial width of the notch is automatically reduced when the magnetic strip is wound, the magnetic reluctance from the teeth to the core back can be reduced

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