Method for the measurement of rotational power loss and related properties in electrical steel sheets;

An apparatus is described which is used to measure the magnetic field vectors in electrical steel sheets in rotating magnetic fields. To avoid complicated eddy current effects we produce a rotating B-vector with constant modulus and angular velocity. Considerable variations of the modulus of the magnetic field strength and of the angle between and during one period of rotation are observed in a sample of non-oriented silicon iron. The results concerning the rotational losses are in good agreement with these measured with a different technique.