Fault-tolerant reluctance motor
AssigneeDanfoss A/S
InventorFinn Jensen
Life of this patent
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Abstract
A fault-tolerant reluctance motor has a multi-phase stator winding. The stator has a different number of poles from the rotor. The lead angle and the pole angle (.beta..sub.s, .beta..sub.r) embraced by each stator and rotor pole is at least the same as twice the step angle ##EQU1## where q is the number of phases and N.sub.r is the number of rotor poles. In particular, the stator has ten poles, the rotor has six poles and the stator winding has five phases. Such a reluctance motor starts up from any motor position in one or other direction of rotation, even when one of the phase windings is completely or partially ineffective owing to a fault.
Claims12
A fault-tolerant reluctance motor having a rotor and a stator, the stator having a different number of poles from the rotor and each stator winding formed by coils associated with the poles of the stator being multi-polar, and including a control device which switches individual phases on cyclically through a respective lead angle, the rotor, during normal operation, starting up from an arbitrary position selectively in one or other direction and, on the occurrence of a fault, continuing to run with reduced torque, in which the lead angle (.alpha.) and pole angle (.beta..sub.1, .beta..sub.s) embraced by each stator and rotor pole is at least the same as twice the step angle ##EQU4## where q is the number of phases and N.sub.r is the number of rotor poles.
Dependencies are inferred from the claim text.