Sensorless control of permanent magnet synchronous motor based on adaptive back-EMF observer

Aiming at the problem that change of motor parameters in actual operation will significantly reduce control accuracy motor, this paper proposes a sensorless method permanent magnet synchronous based on an adaptive back-EMF observer. Firstly, vector algorithm, mathematical model coordinate axis transformation is established, online identification flux linkage, and back EMF observer constructed. The update to achieve accurate rotor position speed motor. Then are verified simulation environment. carried out, comparison analysis made. Finally, platform built laboratory, proposed verified. results show that, under condition change, can be realized control.