关键词: 无传感器, 高频注入, 反电动势, 永磁同步电机, FPGA

Abstract: A full range sensorless control for electrical vehicle used permanent magnet synchronous motor (PMSM) was studied. In the stationary or low velocity region, the back-EMF is difficult to detect, so the high frequency injection method was used to detect the initial position and polarity of the rotor. When the speed is in the transition region, the mixed observer was established due to the influence of the injected signal, fundamental and back EMF of the algorithm. When the rotor speed reaches the high speed area, the back EMF provides enough information, and the back EMF observer was used to estimate the angle. By employing FPGA, the switching frequency and injection frequency were increased, and the transition region was improved. The study was verified by the simulation and experiments on the IPMSM of 1 kW.