A CONSTANT MEASURING METHOD FOR INVERTER APPARATUS

摘要

The method is for detecting parameters of an induction motor during operation. The method comprises: (A) turning off other switching devices of the inverter except one switching device the moment that a current of certain phase rises from zero; (B) detecting the counter electromotive force, speed and current decrement at the moment to calculate the equivalent inductance of the motor; (C) detecting the period and magnitude of the decreasing counter electromotive force; (D) calculating the second time constant of the motor from the equivalent circuit; (E) applying DC voltage to the motor instantaneously to calculate the primary resistance of the motor; and (F) setting the calculated inductance, the time constant, and the resistance as a parameter of the inverter.