Research on P theory and it´s formula of speed control of asynchronous motor

According to the exist problems of traditional electromechanical theory, this paper make new analysis and industrial test on ac motor speed control principle, propose a new power control theory on ac motor speed control, that is ´P´ theory. This theory is: motor speed control principle comes from mechanical. Speed regulation is the control of mechanical power in nature. Therefore, electric control speed has two principles that are electromagnetic power and loss power control, the former change ideal running-in speed nO. It is high efficiency, the latter increasing the speed drop An belonging to low efficiency speed control. The main performance of speed control lies in speed control principle, not specific adjustment speed method. Meanwhile, propose the speed control formula of induction motor.