ABSTRACT
This chapter presents a detailed discussion of radial and peripheral flux density distribution in the airgap and arbor regions of the experimental machine which can be related to the developed torque in the three identified stages as indicated in the measured torque-excitation curve. The torque equivalent to the alternating hysteresis loss in this region corresponds to the initial part of the magnetisation or loss/excitation curve, relatable analytically to the magnetising force in the rotor. The reduction of torque at higher currents is a special characteristic of the experimental machine. Theoretically, the variation of developed torque at increasing magnetising force or excitations should follow the alternating hysteresis loss. A noteworthy feature of the magnetism in the rotor is its effect on the point of reversal in the waveform of average peripheral flus density. A phenomenon that is at times associated with the developed torque in hysteresis machines is the contribution from “rotational” hysteresis.
