Dependence of IPMSM Motor Efficiency on Parameter Estimates

The efficiency of an IPMSM motor is influenced by the operating point machine. Conventional approaches to generate measured maps may be too expensive use in some situations, thus it often replaced simpler variants based on parametric models. A promising approach combine model-based with online parameter identification methods which would allow following changes parameters. However, such also result deteriorated performance if estimation inaccurate. We present a systematic experimental study influence estimates 4.5 kW drive and analyze sources inaccuracy. first outcome this that none tested performs well when machine fully loaded, deteriorates overall performance. second conventional maximum torque per ampere/current (MTPA/MTPC) not accurate optimization criterion. compared heavily depends testing profile. When significant part profile at full load, are unsuitable parameters estimated offline using frequency domain provides better under current control strategy.