A Sensorless Control Approach for Permanent Magnet Synchronous with Contra-Rotating Dual Rotors Motor Based on High Frequency Voltage Pulse Injection

A sensor less control approach for permanent magnet synchronous motor (PMSM) with contra-rotating dual rotors was researched in order to obtain simple configuration and reliable performance. First of all, the mathematical model was established on the basis of the characteristic of surface mounted PMSM with contra-rotating dual rotors. Then a rotating speed estimation algorithm of two rotors was presented based on high frequency voltage pulse injection method. After the rotating speed tracking observer was designed, the sensor less control system of PMSM with contra rotating dual rotors is accomplished. The experimental results verified that the proposed sensor less control approach is competent to PMSM with contra-rotating dual rotors in overall range of speed, and the results indicated that the control system has the advantages of exact tracking, strong robustness and quick response.