Sensorless control via intelligent commutation tuning for brushless DC motor

An intelligent sensorless control strategy for brushless DC motel (BDCM) is presented. The rotor position for making commutation is first roughly esti mated by a proposed switching signal generation scheme using motor terminal voltages. Then an intelligent self-tuning strategy is developed to finely adjust the commutation instant for obtaining optimal torque generating capa bility. This is achieved by a simple but stable self-tuning algorithm to mi nimise winding currents at any instant. The effect of commutation instant o n the BDCM operation capability is observed analytically and intuitively, a nd accordingly, the proposed self-tuning strategy is established. Effective ness of the proposed method is demonstrated experimentally.