Electrical generator or motor structure – Dynamoelectric – Rotary
Reexamination Certificate
2006-04-26
2009-08-18
Nasri, Javaid (Department: 2839)
Electrical generator or motor structure
Dynamoelectric
Rotary
Reexamination Certificate
active
07576466
ABSTRACT:
An electric motor with reduced cogging torque and related method of determining a stator pole geometry are disclosed. The electric motor includes a rotor (80, 91, 96) and a stator (50A,50B,50C,50D,60A,60B,60C,60D,70A,90B,94B,98) having a stator pole geometry incorporating non-magnetic body segments (110) and magnetic body segments (100) as magnetic reluctance equalizing elements to provide an equalized magnetic body distribution along a circumferential periphery of the stator. The method comprises defining a first group of stator poles skewed at an electric angle of 360/(2S), defining a second group of stator poles deviated from the first group of stator poles by an electric angle of 180 degrees, and synthesizing the first and second groups of stator poles pieces to provide a stator including a plurality of stator poles defined in the stator pole geometry to have an equalized magnetic flux distribution pattern along a circumferential periphery of the stator.
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Office Action mailed Aug. 8, 2008, in Chinese Application No. 200610077464.8, with English translation.
Makita Shinji
Nashiki Masayuki
Denso Corporation
Nasri Javaid
Oliff & Berridg,e PLC
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