Eddy Current Loss Measurement of Permanent Magnets Used in Permanent Magnet Synchronous Machines

Measuring the eddy current loss of a permanent magnet (PM) in an external alternating magnetic field of a permanent magnet synchronous machine (PMSM) is a challenging task. Knowing the PM eddy current loss of a PMSM is very important for the safe operation of machines and for increasing the lifetime of machines in long-term operation. In this paper, a simple closed magnetic circuit is used to measure the eddy current loss of the PM used in the rotor of a PMSM. The proposed measurement method is validated by the temperature measurement method. After verifying the initial assumptions, the measuring procedure is modeled in the 3D finite element simulation model and the results are compared to those of the real measuring setup.