Based on the study on basic principle of rare earth permanent magnet brushless DC motor, the motor drive and protective circuit was designed in this paper. According to the work environment of brushless DC motor (BLDCM), the insulated gate bipolar transistor (IGBT) was chosen as a motor inverter unit core element, and IGBT special integrated drive chip VLA517-01R was used as the core to build IGBT driver protection circuit. High speed optical coupling isolation was used between drive circuit and control circuit, avoiding interference from drive circuit to the control circuit, ensuring the reliable operation of the system. Through the test it is proved that the designed circuit possesses good response, high stability, and when circuit fault happens it can reliably shut off IGBT output, feeding back fault signal.
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