Enhanced current control of PM machine drives through the use of flux controllers

This paper compares various types of current controller, including a novel method based on flux control. A PI control method is used initially, to control the current in a permanent magnet machine. The performance of this simple PI loop is presented. Various improvements to the PI controller are investigated and the change in performance examined. A new current control scheme based on a flux linkage model of the machine is introduced. The performance of the model based control is demonstrated and compared with the performance of the PI current controller. Factors affecting the accuracy of the model based control are given. By incorporating these factors into the model, the performance of the flux controller is further enhanced.