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New electrical machines design assumes the execution of research and test-design works with a choice and selection of the effective technical solutions. The prototypes characteristics control is implemented by testing them in laboratory using the automated tools and methods. The automation provides relevant datasets for further analysis. In the paper the algorithms and methods for studying the general purpose induction motors performance characteristics have been proposed. The changes of dependence of the motor efficiency on the output power alterations, caused by using different technical solutions, have been studied. Based on experience of the electrical machines testing in a specialized laboratory, the task of evaluating the induction motors energy efficiency when operating in S1 mode (continuous duty) with overloads occurrence, has been formulated. A method for solving the problem based on the efficiency curves has been proposed. The results have been implemented in a computer program and can be used to improve the technical solutions, allowing an achievement of the target energy efficiency indicators.

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While growing silicon crystals the quality of crystals is significantly affected by the stability of facility parameters, including the levels of vibrations. The torsional vibrations, arising as a result of the rotational moment pulsations, have the largest amplitude. A method for improving the quality of silicon crystals by using the induction motors with combined windings and so called magnetic wedge to reduce the negative effect of the torsional vibrations on the crystallization process has been proposed. The application of the proposed solutions has allowed a 56% reduction of the torsional vibrations level. The computer simulation of the asynchronous motor by the finite element method has been performed. The theoretical results have been confirmed by the tests on the samples of induction motors with combined windings.

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