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

Claim 23:
24. A method for selecting a magnitude of a positive voltage pulse and negative voltage pulse for exciting a stator of a sensorless permanent magnet assisted synchronous reluctance motor during startup polarity detection, 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:
characterizing surface bridge flux density over a range of positive and negative d-axis current values for a sensorless permanent magnet assisted synchronous reluctance motor having a particular configuration;
identifying a d-axis current value and corresponding d-axis reflection current value, wherein the d-axis current value demagnetize the surface bridge flux density to maintain or achieve leakage flux magnetic desaturation, and wherein the corresponding d-axis reflection current value magnetize the surface bridge flux density to maintain or achieve leakage flux magnetic saturation;
selecting a voltage pulse magnitude for a polarity detection positive voltage and a negative voltage pulse such that:
one of the positive voltage pulse and the negative voltage pulse produces the identified d-axis current value that that demagnetizes the surface bridge flux density to maintain or achieve leakage flux magnetic desaturation, and
the other one of the positive voltage pulse and the negative voltage pulse produces the identified corresponding d-axis reflection current value that magnetizes the surface bridge flux density to maintain or achieve leakage flux magnetic saturation.