The optimal efficiency drives of 3-phase induction motor by VV-VF control

VV-VF 제어에 의한 3상유도전동기의 고효율화 운전에 관한 연구

The aim of study in this paper is that in a system drive of the converter-inverter fed induction motor, the minimum input power can be maintained by control the voltage and frequency of the motor. In theoretical and experiment results describtion motor efficiency is improved by properly varying the ratio v/f. At lightly load condition, for example its efficiency was improved from 44% to 66% as the ratio of v/f varied from 1 to 0.57.