This paper presents a comparative analysis of a transfer field machine (TFM) and a poly-phase induction machine (IM) with main focus on physical configuration and principle of operation . It is shown in the analysis that although the two machines belong to two different classes of machine and quite different in physical configuration , yet in their principle of operation , the induced electromotive force ( e. m. f ) as well as the frequency of this induced e. m. f in both the auxiliary winding of the transfer field machine and the rotor of an induction machine , is proportional to slip. And even though the TFM does not have rotor windings, it is also very obvious from the analysis that the auxiliary winding , is playing the role of the rotor winding compared to an IM. The TFM, produces a reluctance torque as a result of the auxiliary (rotor) pole -axis trying to align with the axis of maximum flux . But that of IM, is by alignment of fields ,that is, the rotating magnetic field of the rotor trying to catch up with that of the stator.
