Adjustable-Flux Permanent Magnet Synchronous Motor Sensorless Drive System Based on Parameter-Sensitive Adaptive Online Decoupling Control Strategy

The parameter variation in sensorless control has a great influence on the estimated position accuracy, while the most existing solutions are unsystematic and increase the complexity of the entire drive system. In this article, a new adjustable-flux permanent magnet synchronous motor (AF-PMSM) sensorless drive system under diverse operating conditions is proposed from the perspective of motor design and control. With the special rotor design of the new AF-PMSM, the influence issue of the parameter variation can be well-resolved. To further improve the estimated accuracy of rotor position and suppress the secondary saliencies harmonics, a parameter-sensitive adaptive online decoupling sensorless control strategy is developed. Consequently, the steady-state and dynamic performances and the variable parameter sensitivity of the motor drive system can be improved. Finally, the experimental results verify the feasibility and effectiveness of the proposed motor drive system.