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What type of coils are used for winding the single phase induction motor generally?

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What type of coils are used for winding the single phase induction motor generally?

(a) rectangular coils

(b) square coils

(c) cruciform coils

(d) circular coils

This question was posed to me in a job interview.

Enquiry is from Single Phase Induction Motor Construction topic in section Design of Single Phase Induction Motor of Design of Electrical Machines

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Right answer is (d) circular coils

To explain: The slots house the starting and running windings. The single phase induction motors are generally wound with concentric coils.

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