Advanced Nonlinear Modelling Techniques for Switched Reluctance Machines

F. Dhulster, K. Stockman, J. Desmet, and R. Belmans (Belgium)


switched reluctance machine, advanced modelling, finiteelements, drive optimization


This paper gives an overview of different modelling techniques to describe the nonlinear behaviour of both saturated switched reluctance machine (SRM) and power electronic converter. The current research contributes by comparing the de-coupled single-phase superposition method (lookup-tables) with a coupled analysis between drive model in Matlab/Simulink and finite element model of the SRM motor. Experimental characterization techniques as well as finite element techniques are used to obtain the single-phase flux-linkage data. Transient electromagnetic analysis using the finite element method, coupled with a drive model and optimization strategy in Matlab/Simulink , results in a more accurate SRM modelling. These results are more accurate because the mutual coupling between different phases is taken into account. Using this direct coupling, a complete analysis of the motor behaviour (local saturation, iron losses, ...) can be modelled with the finite element software, keeping the complex drive and control strategy in Matlab/Simulink . At every time step of the discrete solver, data is exchanged between the drive model and the coupled electric circuit of the finite element analysis. Simulation results are compared with measurements of flux-linkage, torque, phase current and iron losses. Pro's and contra's of the coupled and de-coupled modelling technique are discussed.

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