Title:
PERMANENT MAGNET SYNCHRONOUS MOTOR
Document Type and Number:
WIPO Patent Application WO/2010/013444
Kind Code:
A1
Abstract:
Provided is a permanent magnet synchronous motor that can reduce the drop in torque due to magnetic saturation which occurs when current is high, and which can also minimize the increase in heat generation and loss due to increased current, by applying a stator structure suited to driving under low speed/high torque conditions with high current. A slot width is set constant in the radial direction, a slot bottom is in a shape of an arc having a radius length of 1/2 of the slot width, and a magnetic pole piece is provided to extend in the circumferential direction from a teeth inner circumferential side edge toward the center of the slot width. In the permanent magnetic synchronous motor, the permanent magnet is made symmetrical in shape with respect to the d-axis, a cut portion is formed on an outer circumferential surface of a q-axis iron core provided on the advancing and lagging sides of the rotational direction of the permanent magnet, a hole is provided at the q-axis iron core on the lagging side of a rotational direction of the permanent magnet, thereby reducing leakage magnetic flux of the slot and using the same as effective magnetic flux.
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Inventors:
KIKUCHI SATOSHI (JP)
WAKUI SHINICHI (JP)
YAHARA MASATAKA (JP)
OOHARA KOUICHIROU (JP)
FUJITAKE MASASHI (JP)
SAISYO RYOUHEI (JP)
SAKAI TOSHIHIKO (JP)
WAKUI SHINICHI (JP)
YAHARA MASATAKA (JP)
OOHARA KOUICHIROU (JP)
FUJITAKE MASASHI (JP)
SAISYO RYOUHEI (JP)
SAKAI TOSHIHIKO (JP)
Application Number:
PCT/JP2009/003544
Publication Date:
February 04, 2010
Filing Date:
July 28, 2009
Export Citation:
Assignee:
HITACHI LTD (JP)
KIKUCHI SATOSHI (JP)
WAKUI SHINICHI (JP)
YAHARA MASATAKA (JP)
OOHARA KOUICHIROU (JP)
FUJITAKE MASASHI (JP)
SAISYO RYOUHEI (JP)
SAKAI TOSHIHIKO (JP)
KIKUCHI SATOSHI (JP)
WAKUI SHINICHI (JP)
YAHARA MASATAKA (JP)
OOHARA KOUICHIROU (JP)
FUJITAKE MASASHI (JP)
SAISYO RYOUHEI (JP)
SAKAI TOSHIHIKO (JP)
International Classes:
H02K1/16; H02K1/27; H02K21/14
Foreign References:
| JP2007209197A | 2007-08-16 | |||
| JPH08182281A | 1996-07-12 | |||
| JPH0556617A | 1993-03-05 | |||
| JPS55147933A | 1980-11-18 | |||
| JP2005304166A | 2005-10-27 | |||
| JP2005027369A | 2005-01-27 |
Attorney, Agent or Firm:
Polaire I.P.C. (Chuo-ku Tokyo, 32, JP)
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