SiC-Based Inverter Fed High-Speed Permanent Magnet Synchronous Motor Drive

High-speed permanent magnet synchronous motor (PMSM) has irreplaceable advantages in many applications such as air-conditioning compressor of electric vehicles. But the high-speed PMSM usually has high harmonic components in the winding currents and increased motor losses because of the small stator inductance. In this paper, the SiC MOSFET based inverter is applied in the motor drive system to reduce current harmonics by increasing the PWM switching frequency instead of the bulk Sine wave filter. The SiC MOSFET drive circuit is designed and optimized, and then the performance comparison of SiC MOSFET and Si IGBT is made by the double-pulse test. The result shows that the SiC MOSFET has faster switching speed and can be used in inverter with high switching frequency. Meanwhile, the analysis of the current loop shows the bandwidth can be expanded by reducing the control period. The FPGA is employed to realize the double closed-loop vector control of the high-speed PMSM, and the experiments are carried out on a 15,000rpm motor to verify the effectiveness of suppressing high-frequency current harmonics.