There are position sensor windings in addition to armature windings in the motor. 这种电机内部除了电枢绕组以外，还带有位置传感线圈。
When a tooth of the reluctor aligns with the tooth of the pick-up coil, a voltage signal is sent to the ignition module. 当磁阻轮的一个齿与传感线圈的齿对正时，就将一个电压信号送给点火模块。
