LAUSR

Reliable fault diagnosis and identification are essential for permanent magnet synchronous motor (PMSM) drive system with high reliability requirements. Since open-switch fault and output current sensor fault both affect the residual of output phase current, it is difficult to identify them apart from each other. Thus, this paper proposes an open-switch fault and output current sensor fault diagnosis and identification method for matrix converter (MC) based PMSM drive system. The finite control set model predictive control (FCS-MPC) method is applied in MC based PMSM drive system. The fault identification method is proposed based on the extracted different faulty features of open-switch fault and output current sensor fault. After the open-switch fault is separated from the current sensor fault, an error-voltage based open-switch fault diagnosis strategy is applied to locate the faulty switch. Hardware-in-the-loop tests are carried out to verify the effectiveness of the proposed method.