In the applications such as induction motor efficiency optimization and electric vehicle speed control, the influence of the iron loss cannot be ignored. In order to improve the running efficiency of induction motor, the ordinary differential equations (ODE) and difference equations (DE) of induction motors considering iron loss have been established. The results show that the proposed refined ordinary differential equations and difference equations of induction motors considering iron loss and its simulation models are believable, and simulated and experiment results have demonstrated that the models perform well.

On the basis of serious electromagnetic interference (EMI) produced by power electronic equipment, coupling capacitance existing between transistor and transistor is considered as the main factor disturbing differential-mode (DM) loop. Calculation model of coupling capacitance is established by using FEM (Finite Element Method) and moment method, and computing method is also derived. EMI improvement method for converter system is proposed by controlling the coupling capacitance impedance. Experimental results show that changing the placement distance and position of the transistor can reduce the conducted interference.