Compound, series, axial flux induction machines: single phase analogy

The characteristics of the single phase analogy of a pair of axial flux, polyphase induction motors having their respective stator windings and also their magnetic circuits in series, with provision for `out of balance´ flux, arising due to differences in the two rotor speeds, to pass through a saturating magnetic shunt are investigated. Theoretical and experimental results show that when such a pair of machines, fed from a single, variable frequency supply, is used to drive two wheels of one electronic vehicle, torque/speed characteristics that more closely match those of the ideal mechanical differential are obtained than when two independent induction machines are fed either in series or in parallel from a single supply