The Effect of Variation in Electromagnetic Parameters of the Phases on Commutation Processes in Switched Reluctance Motors

The effect of the deviation of electromagnetic parameters of the phases from their calculated values on commutation processes is considered in this article. The deviation occurs due to technological errors when manufacturing switched reluctance motors (SRM). It is shown that these deviations can cause uncontrollable changes in the shape and amplitude of phase currents in a motor, and trigger a further increase of the pulsating component of electromagnetic torque. Simple and practical criteria are proposed for evaluating the tendencies of change in the shape of SRM phase current at the working section of the motor single switch cycle where the majority of electromagnetic torque is generated. Using simulation in the MATLAB-SIMULINK environment these results are consolidated and extended to a SRM with standard parameters that uses rotor position sensor control, and to a SRM with a more widely used sensorless control type when the rotor position at the switching moment is determined indirectly.

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