Electric Motors Supplied by Nonsinusoidal Voltages
The report covers a study to represent electric motors on analog computers, with the representation being usable when the motor is supplied by nonsinusoidal voltages. Such a representation is of particular interest when matching characteristics of static inverters and motors powered from them. The computer representation is based on the coupled circuit approach to motor analysis, permitting ready representation of both steady-state and transient phenomena; winding or voltage unbalance; space harmonics; and application of the scheme to a range of types of motors. In order to approach the complexity of the problem gradually, the balanced equivalent two-phase motor with no space harmonics was represented in this study. The report concludes that: (a) Qualitative observations corroborate the correctness of the analog computer representation of the motor which has been derived during this study. (b) The analog computer representation permits calculation of motor performance for applied sinusoidal voltages as well as for nonsinusoidal voltages supplied by inverters. (c) High-accuracy components are necessary for the analog computer representation of the motor. (d) Meaningful quantitative data could not be obtained, primarily because of deficiencies in the computer components. (Author).
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