Power loss of non oriented electrical steel under square wave excitation

Power loss of nonoriented electrical steel was measured under sinusoidal and square wave excitation. The results show that total power loss under sinusoidal excitation is higher than that under square wave excitation. The total loss difference at the same peak flux density ranges from 7% to 15%. The dynamic losses depend on the shape of the flux waveform, its peak value and frequency. The loss under square wave excitation is less than under sine wave excitation because the mean value of dB/dt throughout the magnetizing cycle is lower provided that the peak values of the flux density waveforms are identical. An attempt is made to relate the differences to effects of distortion on individual component of loss