ABSTRACT
The common parameter for all the tests variously performed on the experimental machine was the applied mmf or excitation per pole, each test consisting of making observations or measurements with increasing excitation current in small steps, commensurate to the magnetisation of the rotor whilst preserving cyclic magnetic state in the machine. The mechanically rotated magnetising field resulting in development of torque in the rotor would represent a non-synchronous operation of the machine. The EMF induced in the coil sides provided either space distribution of flux density at any instant or the variation with respect to time for a given point on the rotor. The uneven flux distribution in the pole tips leads to unequal heights of peaks in the measured waveforms.
