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
\vec{B}
and
\vec{H}
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.