Numerical Analysis of Accuracy of Rotational Magnetic Loss Measurement Apparatus

The magnetic field and loss in an apparatus for the determination of magnetic properties of electrical steel under rotational flux conditions using field sensing coils (H coils) is numerically analyzed by finite element calculations in order to improve accuracy. The method considered here is based on determination of field quantities and makes use of square-shaped samples and an airgap between the pole faces and the sample. Errors in field strength and loss are reduced by using optimum yoke construction and the double H-coil method.