volume | PIER Journals

Abstract

Bearingless interior permanent magnet synchronous motors (BIPMSMs) have a simpler and more compact structure and incur a lower cost than motors supported by magnetic bearings. BIPMSMs offer the advantages of both magnetic bearings and conventional interior permanent magnet synchronous motors. However, rotor vibrations can severely degrade the performance and limit the application of BIPMSMs. Therefore, vibration suppression in BIPMSMs is investigated in this study. First, the factors causing rotor vibrations are analyzed, and the mathematical model of the unbalanced force that causes rotor vibrations is derived in terms of the rotor mass unbalance and inverter dead-time effect. Second, a vibration suppression strategy based on a variable sampling frequency repetitive controller is proposed to enable stable motor operation over a wide frequency range. The sampling frequency is dynamically adjusted according to the change in the vibration frequency to maintain a constant order of the repetitive controller. Finally, simulations and experiments are conducted to verify the effectiveness of the proposed vibration suppression strategy.

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Mr. Bo Yue

Dr. Yizhou Hua

Prof. Huangqiu Zhu