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The chording angle for eliminating 5^th harmonic should be ____________

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The chording angle for eliminating 5^th harmonic should be ____________

(a) 30°

(b) 34°

(c) 36°

(d) 35°

I have been asked this question in an interview for internship.

Enquiry is from EMF Polygon topic in section Synchronous Machines of Electrical Machines

1 Answer

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Best answer
Right answer is (c) 36°

To explain I would say: To eliminate 5^th harmonic kp5 must be zero, kpn = cosnε/2 ⇒ kp5 = cos5ε/2=0=cos90° ⇒ 5ε/2=90° ⇒ ε = 36°.

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