US 12,282,370 B2
Uninterrupted magnetic bearing power control for power failure and recovery
Huaiyu Lin, San Jose, CA (US); Zhongfan Zhao, San Jose, CA (US); Zhengyun Ran, Foshan (CN); and Fei Qiao, Foshan (CN)
Assigned to MIDEA GROUP CO., LTD., Foshan (CN)
Filed by Midea Group Co., Ltd., Foshan (CN)
Filed on Apr. 12, 2022, as Appl. No. 17/719,113.
Prior Publication US 2023/0324972 A1, Oct. 12, 2023
Int. Cl. G06F 1/3206 (2019.01); H02K 1/27 (2022.01)
CPC G06F 1/3206 (2013.01) [H02K 1/27 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A power control system, comprising:
a current sensor, the current sensor being coupled to a permanent magnet synchronous motor (PMSM) and configured to monitor a current profile of the PMSM;
a control unit, wherein the control unit is coupled to the PMSM and a magnetic bearing system, and is configured to receive, from the current sensor, signals associated with the current profile of the PMSM, and control power provided by a main power supply to the PMSM in a first operating mode, and wherein the control unit is configured to:
in response to detecting a power failure of the main power supply of the PMSM and the magnetic bearing system, while the main power supply remains failed:
determine an estimated rotation speed of the PMSM according to the current profile of the PMSM; and
generate, from the PMSM, a first output voltage to power the magnetic bearing system in a second operating mode different from the first operating mode, wherein a value of the first output voltage is generated based on the estimated rotation speed of the PMSM, the value of the first output voltage including a phase configured to be opposite to a current phase within the PMSM;
in response to the control unit detecting a power recovery of the main power supply after detecting the power failure:
determine an estimated rotating angle of the PMSM according to the current profile; and
generate a second output voltage based on the estimated rotating angle of the PMSM to adjust power provided to the PMSM without slowing down a rotation speed of the PMSM, including calculating a phase of the second output voltage relative to the estimated rotating angle of the PMSM.