通常情况下，永磁电机各磁极的极弧系数相等。
In PM motors, all the PM poles usually have the same pole arc coefficients.
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。
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.
从而为合理选择极弧宽度，达到减少电磁转矩波动的目的提供了一种有效途径。
Thus an effective way to design the polar arc width reasonably in order to reduce torque ripple is provided.
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