To improve an yield of a product at mass production by reducing cogging torque caused by the inequality of a stress distribution of a stator core by a simple means, and reducing the cogging torque while keeping the rigidity of a frame, and improving the dispersion of the magnitude of the cogging torque.
The thickness of a frame at a circumferential mechanical angle θ is expressed as T(θ), and the T(θ) is developed into a Fourier series to make a numerical expression 1(but, n=0, 1, 2, 3..., Tn shows the magnitude of the n-th component of the frame thickness, and n shows the number of times of fluctuations of a thickness in its circumferential direction, and n shows its phase). There, it is so arranged that n_max and k are not equal to each other when the component having an amplitude not being zero also exists excluding n=0 out of the components of each order after deployment into the Fourier series and the order of the component of the maximum amplitude is expressed by n_max and the difference between the number Ns of stator slots and the number Np of rotor magnetic poles is expressed by k.
YAMAGUCHI SHINICHI
TODE YUKARI
NAKANO MASATSUGU
ARITA HIDEAKI
TANI YOSHIHIRO
YOSHIOKA TAKASHI
FUJINO CHIYO
| JPS5843157A | 1983-03-12 | |||
| JP2003088013A | 2003-03-20 | |||
| JP2002058204A | 2002-02-22 |
Toshihide Kodama
Takenaka Ikuo
Keigo Murakami
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