Regal Beloit America, Inc.

Md Naim Miah

Ludovic Andre Chretien

Mehrzad Mohammadi Bijaieh

A system including an electric motor of a compressor system and a controller is disclosed. The electric motor includes an inverter and a contactor to operate the electric motor at variable frequency power and line frequency power, respectively. The controller is configured to determine that the electric motor needs to be operated using the line frequency power instead of the variable frequency power in accordance with a load condition on the system. The controller is configured to determine a time to generate a signal to close the contactor by energizing a coil of the contactor, and initiate transition of the electric motor to operate using the line frequency power instead of the variable frequency power by applying the signal to close the contactor at the determined time.

Methods and circuits for line synchronization during transition of an electric motor between variable frequency inverter power and line frequency power

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Fort Wayne, IN, United States of America

Md Naim Miah