| 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 has 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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