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What is the value of the ratio of the core length to pole pitch for good efficiency?

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in Design of Electrical Machines by (687k points)
What is the value of the ratio of the core length to pole pitch for good efficiency?

(a) 1

(b) 1.5

(c) 2

(d) 3

I had been asked this question in exam.

Query is from Main Dimensions topic in portion Three Phase Induction Motor of Design of Electrical Machines

1 Answer

+1 vote
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Best answer
The correct option is (b) 1.5

Easy explanation: 1 is the value of the ratio of the core length to pole pitch for good overall design. 1.5 is the value of the ratio of the core length to pole pitch for good efficiency.

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