Abstract
The disc-rotor induction motors come in a variety of structures such as double-sided
stator, single-sided stator with iron backing rotor, and single-sided stator without iron
backing rotor. This paper presents the field analysis of the disc-rotor induction motor
using two-dimension analysis of magnetic field. The computational treatments are
based on the solution of field equations written down in cylindrical coordinates. This
analysis is carried out using the vector potential, which is shown to be readily
adaptable to the evaluation of the air-gap impedance for different disc motor
constructions. The magnetic vector potential enables the effect of physical air-gap and
finite permeability and conductivity of a number of machine regions to be taken into
account. Using this new technique, the complex expression of the impedance can be
rearranged to predict the individual equivalent circuit parameters.