Effects of the Magnetic Model of Interior Permanent Magnet Machine on MTPA, Flux Weakening and MTPV Evaluation

Interior permanent-magnet synchronous machines are widely spreading in automotive and vehicle traction applications, because of their high efficiency over a wide speed range. This capability can be achieved by appropriated control strategies: Maximum Torque per Ampere (MTPA), Flux Weakening (FW) Volt (MTPV). However, these trajectories often based on an simplified magnetic model the electrical machine. In order to improve evaluation machine output capabilities, nonlinear behavior must modeled. is not only related final application with given drive structure, but also during design process electric process, torque Vs. characteristic calculated following MTPA, MTPV FW most accurate way avoid significant error. paper proposes set algorithms compute curves for interior taking into account machines’ nonlinearities caused iron saturation compares differed approaches highlight torque–speed capabilities same different methods. The maps equivalent inductances reference were obtained via 2-D Finite Element Analysis machine’s operating points id−iq plane. effects finite element methods computed both standard magnetostatic simulations Frozen Permeability simulations. Results show that frozen permeability more than conventional linear models simulations; this reason, design, it important check expected performance employing complete inductance map permeability.