Numerical Simulation And Analysis On Electromagnetic Field Of Switched Reluctance Motor Based On ANSYS

Switched Reluctance Motor(SRM) has gotten wide attentions among enterprises and researchers for features of simple structure, low cost, wide speed range, however,torque ripple and noises are two assignable defects of it. In order to improve performance and broaden application fields of SRM, torque ripple suppression and control parameter optimization become two hot points of in-depth study on SRM, and precise calculation of electromagnetic field is the basement of the study. The doubly salient structure of SRM leads to the electromagnetic properties are highly nonlinear,and boundary conditions of electromagnetic field are complex, so it is important to select appropriate calculation model and method, utilizing FEM is an effective means.To get accurate results, the electromagnetic field of SRM is calculated by using ANSYS.In accordance with empirical formulas of motor’s designing and the given parameters of prototype, the specific structure sizes of SRM are calculated which provides geometric basis for construction of the finite element model. Using ANSYS for two-dimensional finite element analysis on SRM, and contours of magnetic parameters reflect that the distribution of Switched Reluctance Motor’s magnetic field is nonlinear,and it not only relates to winding current but also the relative position of stator and rotor.Magnetization curves are basements of the calculation of Switched Reluctance Motor’s static performance. Macros of ANSYS can calculate magnetization curves under conditions of different current densities and rotor’s displacement angles.Magnetization curves reflect that fluxes change nonlinearly with winding currents and displacement angles of rotor, and the diversification is unaffected by magnetic saturation. Based on magnetization curves, torque curves are obtained, changes of torque are seen form these curves, and the maximum electromagnetic torque emerges in the initial position, so advancing the opening angle is advantage to obtain the maximum electromagnetic torque earlier; torque ripple is relation to winding current, the lager the magnitude of torque ripple current increases, and torque curve’s trend is more intense.When the current density is 3A/mm2, the peak of electromagnetic torque is the minimum, and torque ripple is the minimum, and the torque curve is also the most smooth. When the current density is 7A/mm2, the peak of electromagnetic torque is the maximum, and torque ripple is the maximum, and changes of torque curve also have themost dramatic trends. When the current density is 5A/mm2, the torque peaks and fluctuations are in between 3A/mm2 and 7A/mm2, and SRM has both lager electromagnetic torque and smaller torque ripple.