US 12,407,230 B2
System and method for permanent magnet assisted synchronous reluctance motor control from zero or low speed
Radu Bojoi, Turin (IT); Zheng Zhang, Saint Joseph, MI (US); Dingsheng Lin, Venetia, PA (US); Song Chi, Cary, NC (US); Liyang Sun, Shaoxing (CN); and Weican Yan, Shaoxing (CN)
Assigned to Wolong Electric Group Co. Ltd., Shaoxing (CN)
Filed by Wolong Electric Group Co. Ltd., Zhejiang (CN)
Filed on Jan. 4, 2024, as Appl. No. 18/403,895.
Application 18/403,895 is a continuation of application No. 18/234,000, filed on Aug. 15, 2023, granted, now 11,894,740.
Prior Publication US 2025/0062668 A1, Feb. 20, 2025
Int. Cl. H02K 21/38 (2006.01); H02K 11/30 (2016.01); H02P 21/14 (2016.01); H02P 21/34 (2016.01); H02P 25/089 (2016.01)
CPC H02K 21/38 (2013.01) [H02K 11/30 (2016.01); H02P 21/14 (2013.01); H02P 21/34 (2016.02); H02P 25/089 (2016.02); H02P 2207/05 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A sensorless permanent magnet assisted synchronous reluctance motor comprising:
a stator mounted having a three-phase stator winding configuration;
a rotor including a magnetic permeability core having a plurality of flux barriers that divide the core into a plurality of main rotor flux path segments to control flow of magnetic flux within the rotor, wherein the plurality of flux barriers hold a plurality of permanent magnets, the magnetic permeability core including a plurality of surface bridges that join the plurality of rotor flux path segments together, the rotor being rotatable relative to the stator via excitation of the three-phase stator winding configuration of the stator, wherein the plurality of permanent magnets generate a plurality of rotor magnetic poles having magnetic polarity;
a main magnetic flux path between at least one of the plurality of rotor flux path segments and the stator;
an unloaded leakage magnetic flux path through at least one of the plurality of surface bridges having a directionally magnetized flux density caused by at least one of the plurality of permanent magnets;
a motor control system configured to detect at least one of rotor position, rotor speed, and rotor magnetic polarity, based on a variation of inductance caused by the leakage magnetic flux path through the at least one of the plurality of surface bridges.