| The high operating cost, owed to the large consumption of active and reactive power, led to the optimization of the design and construction of asynchronous motors used in driving the coal mills. The reduction of the operating cost is a difficult problem, because the motor usually lies in a closed enclosure, with provided gauge dimensions, and with specific requirements imposed by the type of drive in use. Using this information, while keeping the existing electromagnetic stresses (for heating reasons), the optimal construction dimensions can be established by design, so as to reduce the operating cost. The optimization is substantiated by the decrease of the operating cost of such a motor with 26100 euros, as compared to the existing version. |
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