Uninterrupted magnetic bearing power control for power failure and recovery

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.