A.磁力線按永久磁鐵→定子與轉(zhuǎn)子間的空氣間隙→轉(zhuǎn)子凸齒→轉(zhuǎn)子凸齒與定子磁頭間的空氣間隙→永久磁鐵S極
B.磁力線按永久磁鐵→定子與轉(zhuǎn)子間的空氣間隙→轉(zhuǎn)子凸齒→磁頭→永久磁鐵S極
C.磁力線按永久磁鐵→轉(zhuǎn)子凸齒與定子磁頭間的空氣間隙→轉(zhuǎn)子凸齒→定子與轉(zhuǎn)子間的空氣間隙→磁頭→永久磁鐵S極
D.磁力線按永久磁鐵→定子與轉(zhuǎn)子間的空氣間隙→轉(zhuǎn)子凸齒→轉(zhuǎn)子凸齒與定子磁頭間的空氣間隙→磁頭→永久磁鐵S極