Prediction of Starting Performance of Induction Motors Using Two Frequency Characteristics

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  • 2つの周波数特性を用いた誘導電動機の始動特性算定法
  • 2ツ ノ シュウハスウ トクセイ オ モチイタ ユウドウ デンドウキ ノ シドウ トクセイ サンテイホウ

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This paper presents a method to predict the starting performance of induction motors using two frequency characteristics which is obtained by no-load and standstill response test using a AC power supply unit. A new equivalent circuit in which the rotor side circuit consists of two circuits is applied to accurately predict the starting performance of induction motors. In addition, a method for determining equivalent circuit constants using the impedance values, obtained by standstill response test, at two different frequencies is also described. The proposed method is carried out on 5.5kW-200V-22A-4P-50Hz induction motors, one with a semi-closed squirrel-cage rotor and the other with a semi-closed double squirrel-cage rotor. Experimental and prediction results on starting performance clearly show the validity of the proposed method. In addition, the frequency values used to identify the equivalent circuit constants are also discussed based on experimental consideration.

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