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.
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McLean et al. (1969) studied this question.
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