CONTROL OF PERMANENT MAGNET SYNCHRONOUS MOTOR

Abstract: The use of PMSM (permanent magnet synchronous motor) in the industry increased strongly because of the advantages such as: high efficiency and torque intensity. The ordinary speed control of these motors use encoders which has the effect of increasing the noise, complexity and price of the system. To solve this problem, sensorless speed control have come to industry. There are a lot of sensorless algorithms but the most efficient methods are MRAS and SMO where EEMF (extended electromotive force) should be determined to specify the position or speed. There are two ways to implement these algorithms, either DSP or FPGA. In sensorless speed control, a model is built for the motor, this motor should work in parallel with the real motor. Real states such as currents of the motor are measured, and estimated states of the model are calculated simultaneously. This process is concurrent, and since the parallel processing is one of the best features of the FPGA, then the FPGA is more preferable than DSP in this application. So if parallel process is exist then FPGA is more preferable otherthan DSP. This work gives a simple review about control strategies of PMSM.