Test specimen shape considerations for the measurement of rotational core losses

Accurate modeling of rotational core losses in AC electrical machines is necessary, theses losses occur at the roots of teeth and at the back of the slots in stator yokes of AC machines. In order to achieve a satisfactory model, the experimental measured data has to be as accurate as possible. The purpose of this paper is to propose a novel design of a magnetic circuit based on electromagnetic Halbach array, which generates a uniform flux density inside the specimen. Particular attention is paid to the test shape to allow accurate measurements.