周期電源駆動誘導電動機の拡張等価回路

概要

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In this paper, we propose a novel modified equivalent circuit of an induction motor which can be directly applied to a distorted periodic power source such as an inverter output.This modified equivalent circuit can be obtained only by adding a set of parallel resonance circuit of an inductor L and a capacitor C for the fundamental frequency to the conventional equivalent circuit. The voltage across this resonance circuit corresponds to the internal induced voltage of an induction motor. So it is useful to understand physically the operation of an induction motor from the equivalent circuit. The operating waveform of an induction motor can be directly obtained from the time domain analysis of the state variable equations of this equivalent circuit.In this paper, at first, this modified equivalent circuit for two types of circuit models is proposed, and the analyzing method by the state variable equations of the circuit is described. After that, the digital simulation results for some output waveforms of the voltage fed and current fed type inverters are shown and verified from the presented literature. The analog simulator of this equivalent circuit and simulation results are also shown.The modified equivalent circuit will be very useful to investigate and analyze the driving characteristics of an induction motor for any periodic wave power sources from the utility line voltage to any types of inverter outputs.
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