The influence of periodic load on pulsations of electromagnetic torque and rotational speed, the losses and the efficiency of frequency-controlled induction motors for single-cylinder piston compressors are investigated using computer modeling. The region of critical reduction of motor efficiency when changing the frequency and supply voltage and the loading degree are determined using the criterion of heavy quasi-static regimes. References 16, figures 7, tables 2.

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The method of determining and mathematical representation of the relationship of the equivalent circuit parameters of an induction motor (IM) with its design and operational parameters using the results of field analysis has been proposed. This method has created a polynomial mathematical model of a system of electromagnetic parameters of a generalized IM, for design, which together with the IM circular mathematical model is an analogy of a field mathematical model. On the example of calculation, according to the obtained analogy of the IM field mathematical model, the IM design condition determines the degree of its adequacy to the results of the field analysis. References 9, figure 1. table 1.

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