Three-Phase Electromagnetic Device for the Evaluation of the Magnetic Losses in Electric Motors’ Stators

This paper describes a new test device that allows a better evaluation of the magnetic losses generated in the ferromagnetic core of the stator of three-phase rotating electrical machines. One of the main advantages of this electromagnetic testing device-from here called “Tester”-is its ability to measure the magnetic losses in all parts of the sample (teeth and yoke), which is an advantage comparing with the Core Test. The magnetic flux generated by the proposed Tester has the same characteristics of the flux generated in induction motors, allowing a better assessment of magnetic losses in electrical steel sheets. Three different suppliers of the same electrical steel were evaluated with the aim to compare the results of three experimental methods: 1) Epstein frame; 2) electric motors tests (no-load tests); and 3) the tester here presented.