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A field-circuit coupled finite element method has been applied on one induction machines for the transient analysis in case of inverter power supply and sinusoidal voltage supply in this paper. The focus is to build the time-stepping finite element method with external circuit coupled to the electromagnetic field equations and achieve voltage supply. The problem of the motion of rotor is solved through moving boundary by interpolation in the moving coordinate system. The induction machine starting transient simulation has been completed using Finite element equations indirect coupled with mechanical equation. The influence of the electromagnetic field and performance has been analyzed compared with sinusoidal condition. This method can be used for dynamic analysis of any power supply taking into account the magnetic nonlinearity of the core material. The established machine overall structure model is closer to the actual. Compared to the traditional analysis method, we can reduce the dependency of experience design. It can also be used for analysis and optimization of the new machine

The junction temperature prediction of IGBT module is related to its temperature and current, so it involves coupled electro-thermal calculation. This paper proposes electro-thermal sub-strong coupling model of IGBT modules. Due to the electrothermal indivisibility of IGBT module, this paper only considers part of coupling terms under the condition of ensuring the accuracy of the calculation. The formula of collector-emitter saturation voltage with current and temperature in IGBT chip is derived. By the method, the equivalent resistivity of IGBT chip is extracted. Finally, the sub-strong coupling model is used to simulate the temperature distribution of IGBT module. The accuracy of the model in predicting internal temperature is demonstrated of the IGBT module successfully by comparing the simulated results to experimental data.