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Practical Application and Methods of Calculation for Linear Induction Motors

This paper deals with the practical applications and a novel method of calculation of linear and arched-stator induction motors with open magnetic circuit of limited length inductors with flat, cylindrical, or rotating working bodies, moving under the action of a field of these inductors. The design of three-phase flat motors, developed by the author for special transport systems, working in the conditions of hermetic protective chambers with aggressive environment, is shown. In addition, the information about developed three-phase tubular linear motors for mechanisms of mining industry, and single-phase linear motors for high-voltage switching devices is presented. The designed arched-stator and flat single-phase induction motors with open magnetic core for electric drives of measuring carriages at enriching plants, and for laboratory shakers of liquid products are introduced. The theoretical part of the paper describes the author's unconventional approach to the calculation of tractive and power characteristics of the motors, taking into account the electromagnetic asymmetry of the phases of inductors due to longitudinal edge effect. This asymmetry previously was not considered in calculations and, as shown in the paper, it leads to large errors in calculations for the motors with a small number of poles. Thus, the motors have to be considered as asymmetric system, which can be described with application of the method of symmetrical components, allowing receive rather simple solutions suitable for engineering practice.