Construction of Condition Monitoring and Fault Diagnosis System for PMSM Drive System Based on DSP

With the rapid development of power electronics technology, microprocessor technology and control theory, AC servo technology is applied to more and more production occasions. Among them, PMSM occupies a major position in AC servo system because of its superior control performance. The CNC machine tool is composed of machine tool body and CNC servo system. Servo system is an automatic control system with mechanical displacement as the direct control target. The feed servo system of CNC machine tool controls the cutting feed motion of each axis of the machine tool, and the servo system executes the motion instructions from CNC device. The essence of vector control is to control the motor speed by controlling the current. This method is easy to control and realize digitally, and can significantly reduce the harmonic component of the inverter output current and the harmonic loss of the motor. In this paper, the operating characteristics of the inverter-fed PMSM drive system under fault conditions are studied, and the current and torque waveforms of the DSP inverter switch element under open circuit and short circuit fault conditions are simulated and analyzed. The fault detection and diagnosis of the drive system can be further realized by analyzing the current and torque waveform characteristics under fault conditions.