Harmonic Effects in Rotating Electric Machines

When harmonic effects are of significance, direct algebraic analysis permits the determination of machine current, voltage and torque waveforms with extremely hiclh efficiency. Unfortunately, this efficiency, which permits large savings in computational time over alternative methods, has only been employed in simple situations because of the enormous labour involved in deriving the initial algebraic equations. The availability of an algebraic compiler, FORMAC, has permitted mechanization of this initial phase of the analysis so that general analvtic results are now available. The validity of these equations has been experimentally verified by considering two typical cases, the wound rotor induction motor and the three-phase synchronous machine, and two particularly demanding situations, the single-phase synchronous machine and an induction type machine with single-phase primary and secondary windings.