Rotational core loss test setup: Design and measurement

Rotational core loss data is required for core loss estimation in electrical machines. This necessitates the design of 2D magnetizers to accurately measure these losses. However, the accuracy of any 2D magnetizer is contingent on its ability to maintain a uniform field distribution in the sample, at least in the measurement area, for all flux density levels and magnetization directions. Moreover, the measurement area should be large enough to allow measurements over a wide sample area, which effectively represents the material properties. A 2D magnetizer is designed to allow a measurement area of 65 by 65 mm on a 136 mm diameter circular sample. The magnetizer was prototyped and preliminary core loss measurements presented for both pulsating and rotational core losses using M19G29 steel at 60 Hz.