METHOD FOR DISCRIMINATING INPUT OPEN-PHASE OF INVERTER IN 3-PHASE AC MOTOR

摘要

This invention is entered using the ripple size and the ripple frequency of the direct current voltage outputted from the inverter and the capacitor imaging relates to a method of determining the three-phase alternating-current input imaging devices which can determine the motor overload, the size of the ripple in the inverter input is three-phase AC power is converted to direct current voltage and the measured phase; The measured ripple in size comprising the steps of: determining larger than a preset reference ripple size; The determination result, the measured size is greater than the reference ripple ripple size, measure the ripple frequency of the DC voltage ripple, and the ripple frequency and the measured period and comparing the reference ripple frequency set; The comparison, the measured ripple frequency is smaller than a preset ripple frequency, if the processes are repeated by a preset predetermined time or more, including the step of determining a yirueojim Input phase, preventing the damage of the inverter and the motor, the user may give the convenience, there is an effect that can increase the life and reliability of the inverter.