Comparison of FEA field models combined with analytical method to determine the performance characteristics of high efficiency induction motors

This paper proposes a comparison among FEA field models combined with analytical model, in order to predict with better accuracy the NEMA/IEC performance indicators. Such indicators are the locked-rotor current, efficiency, breakdown torque and locked-rotor torque. The Stationary (S), Time-Harmonic (TH) and Time-Stepping (TS) models have been compared with different simulation features, such as: linear (L) or nonlinear (NL) magnetic material, and with or without an external circuit coupled (C) to the FEA field model (effects of stator circuit). Benchmarks have been calculated by using nameplate and manufacturer data and compared with impedance tests and the method F1 from IEEE 112/2004 to measure efficiency and the breakdown torque. Regarding both no-load and locked-rotor analyses, seven simulation tests were carried out. As result, the S model (no-load) and the NL-TH-C (locked-rotor) have the best accuracy in predicting the performance indicators NEMA/IEC.