Sensor-less control of low-speed PMSM based on MRAS
 
LV Hua-fen， YE Yun-yue
（College of Electrical Engineering， Zhejiang University， Hangzhou 310027， China）

Abstract： In order to solve the problem of stable operation of low-speed multiple permanent magnet synchronous motor（PMSM） in working environment，the sensor-less control based on model reference adaptive system（MRAS） was investigated. The adjustable model was built according to the reference model of the motor，and regulated based on suitable self-adaptive law to estimate speed and rotor-space position in control system. A simulation model of sensor-less control based on MRAS was built in Simulink to simulate and analyze. The simulation results show that MRAS has a high estimation accuracy，good tracking performance，stable steady-state speed，good dynamic and static performance，and strong robustness towards speed variations and load disturbance of PMSM，MRAS has a good adaptability，but it's very sensitive to motor parameters.
Key words： model reference adaptive system（MRAS）；low-speed permanent magnet synchronous motor（PMSM）；rotational speed；rotor space-position