Purpose. Obtaining analytical calculated dependencies for finding the optimal time of magnetization and demagnetization of stopped frequency-regulated synchronous motors and the corresponding minimum energy loss in these motors for the regimes of magnetization and demagnetization.Methodology. Variational calculus and the theory of similarity, operator method and computer simulation.Findings. When varying the duration of the magnetization and demagnetization times, electrical energy losses were researched during magnetization and demagnetization of stopped synchronous motors for various types of them (with excitation winding in the presence or absence of damping windings; with permanent magnets; synchronous-jet motor) and with different trajectories (optimal, linear and parabolic) changes in the flux linkage and currents of these motors. The optimal type of paths of change in the flux linkage (or current) for each of the motor types researched is determined, corresponding to the minimization of energy loss in these machines under magnetization and demagnetization regimes. The minimum energy losses and the corresponding optimal magnetization and demagnetization times for the considered types of synchronous motors are calculated.Originality. For the investigated types of synchronous motors analytical dependences are proposed for calculating the optimal magnetization and demagnetization times, which ensure minimal energy losses in these motors under magnetization and demagnetization regimes. Analytical dependences are obtained for calculating the minimum energy losses in the indicated motors under these conditions.Practical value. Through the optimization of the magnetization times and demagnetization, the considered types of synchronous motors are reduced by a factor of 1.2 – 1.4 times or more for the energy losses of their regimes magnetization and demagnetization.
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