An Experimental Evaluation of Eddy Current Loss Measurement in Interior Permanent Magnet Synchronous Machine During Rotational Operation

The proper knowledge of eddy current loss that occurs in permanent magnets (PMs) of permanent magnet synchronous machines (PMSM) fed with inverter power supply is very important in determining the total efficiency of the machine. In general, the experimental determination of eddy current loss in PM occurring in the PMSM during operation poses a huge challenge. In this paper, an innovative measurement concept (Thermometric and Hysteresis loop method) with a real-time wireless measurement signal transfer test bench is set up which enables eddy current loss measurements experimentally. Due to the limited sampling rate of the measurement system, the higher harmonics parts of the signals are ignored, which results in a significantly underestimated PM loss. In addition, a 3D finite element method (FEM) simulation has been carried out to evaluate the measurement results. The obtained results are compared with each other and presented in this paper.