Patent ID: 11894740
Assignee: WOLONG ELECTRIC GROUP CO., LTD.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 12:
13. A method for determining magnetic polarity of a sensorless permanent magnet assisted synchronous reluctance motor, wherein the sensorless permanent magnet assisted synchronous reluctance motor includes a stator having a three-phase stator winding configuration and a rotor including a magnetic permeability core having a plurality of flux barriers that hold a plurality of permanent magnets and a plurality of surface bridges, wherein the plurality of permanent magnets generate a plurality of rotor magnetic poles having magnetic polarity, the method for determining magnetic polarity comprising:
selecting a magnitude of a positive voltage and negative voltage pulse such that:
one of the positive voltage pulse and the negative voltage pulse demagnetizes directionally magnetized flux density in the at least one of the plurality of surface bridges, and
the other one of the positive voltage pulse and the negative voltage pulse further magnetizes the flux density in the at least one of the plurality of surface bridges;
applying the positive and negative voltage pulses to the three-phase stator winding configuration of the rotor;

detecting a current response to the positive voltage pulse;
detecting a current response to the negative voltage pulse;
determining the magnetic polarity of the plurality of magnetic poles based on the current response to the positive voltage pulse and the current response to the negative voltage pulse.