Maximum Power Factor of Three Phase Induction Motor

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  • 三相誘導電動機の最大力率について
  • サンソウユウドウデン ドウキ ノ サイダイ リキリツ ニ ツイテ

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Recently, the maximum power factor of three point circle diagram of three phase induction motor was suggested by Mr. Takeuchi. The maximum power factor changes by the supplied voltage and it decreases according to the voltage rise. We have experimental studied for the relations between the maximum power factor and supplied voltage, and the relations between the relative values of maximum power factor and supplied voltage, and the dimensions of magnetic path, about the 12 kinds of induction motor. We define Δcosφm, θ and σ as to the relative values of maximum power factor and supplied voltage, i. e. Δcosφm is the value of the difference between maximum power factor at 50V and rated voltage, θ is the angle between the tangent of the maximum power factor-voltege curve and vertical line at the point of 50V, σ is the saturation factor of its curve at the point of 50V. By the result of experiments, it is cleared that the maximum power factor is negative exponential of voltage, it shows the value of V^<-0.043∿-0.061> for 1/4∿2HP machines, and the value of V^<-0.046∿-0.095> for 7.5HP, or; more or less its capacity motors, so that it shows the value of V^<-0.043∿-0.095> for all testing motors. Next, it is cleared that the relative values such as Δcosφm, θ and σ are positive or negative propotional to the several values of the ratio of partial magnetic path of machine, and Δcosφm is nearly constant for two ratios of the other parts of partial magnetic path, and for the another some ratios of the other parts, these are not distinct.

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