Variable reluctance start permanent magnet motor

Details Variable reluctance start permanent magnet motor Variable reluctance start permanent magnet motor

H - Electricity

02

K

H02K 1/06 (2006.01) D21H 17/61 (2006.01)

Patent

CA 2146382

Abstract of the Disclosure A single-phase permanent magnet motor (10). A stator assembly (12) includes a stator (14) having a central bore (16) and a plurality of salient poles (18a-18d) extending into the bore. A rotor (13) is positioned within the bore and is rotatable relative to the stator. A magnet (22) installed on the rotor is used to position the rotor in a stable detent or parked position to facilitate starting the motor. The magnet is a ring magnet formed on the rotor and the magnet has a plurality of magnetic ring segments (24a-24d) extending circumferentially about the ring. Each ring segment is shaped to provide a constant level of flux across the ring segment. Each stator has an indentation (36) at one end for aligning the rotor with the stator in its parked position. The result is the availabilty of more starting torque to start the motor than is available in other motor constructions.

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