Performance and design of induction motors with square-wave excitation

The paper investigates the reasons for loss of efficiency when conventional induction motors are supplied with square-wave voltages. A method of analysis using harmonic travelling current-density waves is developed and methods of design are described to produce induction motors with comparable efficiency and output to those of sinusoidally fed machines. The air-gap flux densities in these motors are discussed, and experimental values of iron losses are given to compare with conventional machines.