Four Quadrant Operation of Switched Reluctance Motor with Online Turn ON Angle Control

This paper describes four quadrant speed control of SRM with online turn ON angle control. A speed PI controller and a current PI controller are used for the purpose. Online turn ON control has also been implemented that adjusts the turn ON angle according to the torque demand and speed, it uses reference current, speed, and DC link voltage to do so. A logic has been developed to determine in which quadrant the motor should be running based on actual speed and reference speed, and it is used to decide whether the winding should be excited on increasing slope or decreasing slope. With the help of this control strategy the motor can track the speed reference in all four quadrants. This method is experimentally verified on 8/6 SRM using an asymmetrical bridge converter to power the SRM and dSPACE controller board. This technique can be used for low performance applications.