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Efficient Determination of the Behavior of Permanent Magnet Synchronous Machines using Magnetic Equivalent Circuits

This paper presents an computationally very inexpensive way to determine the operating behavior of permanent magnet synchronous machines (PMSM). For this purpose, magnetic equivalent circuits (MEC) are used, which are solved with a fast calculation method and evaluated and validated by means of detailed finite-element-method (FEM) simulations. Both the procedure for building the MEC and the solution method are presented. Emphasis is placed on a simple, but as accurate as possible structure of the MEC. The evaluation of the results is performed using the air gap flux density, the inductances, the flux linkages and the torque. The calculations are made taking into account saturation effects in order to be able to determine the parameters at different operating points.