| 摘要 |
A motor ( 1 ) has a stator ( 2 ) and a rotor ( 10 ) mounted for rotation in the stator. A commutating salient pole ( 11 ) of the stator as a winding ( 7 ), and a field-producing salient pole ( 12 ) has a winding ( 8 ). The rotor has at least two salient poles ( 10 a, b). An outer back-iron ( 13 ) magnetically joins bases of said stator poles. An inner back-iron ( 14 ) extends from the field pole around the rotor to such an extent that a substantial amount of the magnetic field in the rotor between its poles is short-circuited by the inner back-iron, at least for a part of its rotation. An electrical circuit powers the windings to drivingly rotate the rotor.
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