Rotational magnetisation and losses

This chapter introduces fundamental aspects of the rotational magnetisation process and its general effect on losses and magnetostriction in both isotropic and highly anisotropic material, such as GO electrical steel. In a core assembled from electrical steel, the magnetic field and flux density probably will vary in magnitude from point to point within the material. Also, under a.c. magnetisation its time varying waveform might be non-sinusoidal. Furthermore, the direction of B and H at a given point within the core material might vary with time. These effects are loosely referred to as being rotational magnetisation phenomena.