Performance analysis of interior permanent magnet synchronous motor for electric vehicle considering magnetic saturation effect

In this paper, a simulation algorithm for driving performance considering nonlinear parameters of interior permanent magnet synchronous motor (IPMSM) for electric vehicle such as d-axis, q-axis inductances, and core loss is proposed. D-axis and q-axis inductances are changed according to both current magnitude and the angle between q-axis and current axis because of nonlinearity of magnetic flux density in a rotor core. Moreover, core loss characteristic for the calculation of efficiency map is also changed according to these parameters. Therefore, we calculate d-axis and q-axis inductance 3D tables, and core loss 3D table considering nonlinearity of magnetic flux density by using FEM.