A motor with small ripple and capable of high-speed rotation includes six stator poles having widths of about 60 degrees, which is less than 60 degrees when converted to rotor rotational angle. Excitation windings (HA3, HA4, and so forth) wound around the stator poles are connected in series with adjacent excitation winding connected in reverse series. Torque windings (HA1, HA2, and so forth) wound around the stator poles have three phases, where each phase winding comprises a pair on opposite sides with respect to the center of rotor rotation, separated from each other by 180 degrees, and connected in reverse series. In addition, two rotor poles (3) having widths from 60 degrees to 120 degrees when converted to the rotor rotational angle are provided.
A reluctance-type motor include a stator having a plurality of salient stator-poles, a rotor having a plurality of salient rotor-poles, a multi-phase coils mounted in the stator, and a driver circuit for driving said multi-phase coil. The driver circuit starts to supply drive current to the multi-phase coils when the salient rotor-poles and the salient stator-poles come across each other. In other words, the drive current is supplied to the multi-phase coils when the inductance thereof is zero.
A dual stage drive for a switched reluctance motor (SRM) is disclosed, the SRM having a plurality of phase coils associated therewith. In an exemplary embodiment, the dual stage drive includes at least one of the plurality of phase coils coupled to a first power bus, and at least another one of the plurality of phase coils coupled to a second power bus. Energy within the at least one phase coil coupled to said first power bus is dissipated through said second power bus.
