POWER LOSSES OF ASYNCHRONOUS MOTOR IN FREQUENCY-CONTROLLED DRIVES WITH PULSEWIDTH MODULATION

摘要

Taking account of the nonsinusoidal state current of an asynchronous motor for drives with an autonomous voltage inverter and direct frequency conversion with pulsewidth modulation of the output voltage in relay control (within a tube) of the modulus of the generalized stator-current vector of the motor, analytical relations for the power losses of the motor in steady conditions are obtained; the influence of the modulation frequency and the width of the current tube on the motor power losses is studied.