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Calculate the 3-∅ power developed in the IM using the following data: VL=20 V, IL=5 A, cosΦ=.8.

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Calculate the 3-∅ power developed in the IM using the following data: VL=20 V, IL=5 A, cosΦ=.8.

(a) 138.56 W

(b) 128.41 W

(c) 163.78 W

(d) 177.59 W

I had been asked this question by my school teacher while I was bunking the class.

I would like to ask this question from Power Rating Determination of Electric Motors for Different Applications in chapter Rating and Heating of Motors of Electric Drives

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Right choice is (a) 138.56 W

Easy explanation: The power developed in the IM is √3VLILcos∅. The power is independent of time and frequency. P=√3VLILcos∅=√3×20×5×.8=138.56 W.

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