In PM motors, all the PM poles usually have the same pole arc coefficients.
通常情况下，永磁电机各磁极的极弧系数相等。
A permanent magnet with a wide pole arc circular ring structure is arranged on the rotor and fixed with a non-magnetic thin-wall outer ring.
转子上装有宽极弧圆环结构的永磁体，永磁体用非磁性的薄壁外圈固定。
The opening air-gaps with circular main pole arc are usually used to improve the potential curve of commutator on non-compensable d. c. traction motors.
在无补偿直流牵引电动机中，通常采用主极极弧为圆弧的扩张气隙来改善换向器电位特性。
The opening air-gaps with circular main pole arc are usually used to improve the potential curve of commutator on non-compensable d. c. traction motors.
在无补偿直流牵引电动机中，通常采用主极极弧为圆弧的扩张气隙来改善换向器电位特性。
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