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How much of the total slots are used for the reduction of the mmf wave harmonics?

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in Design of Electrical Machines by (687k points)
How much of the total slots are used for the reduction of the mmf wave harmonics?

(a) 60%

(b) 65%

(c) 70%

(d) 80%

I had been asked this question in unit test.

I would like to ask this question from Design of Stator in division Design of Single Phase Induction Motor of Design of Electrical Machines

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The correct option is (c) 70%

Easiest explanation: 70% of the total slots are used for the reduction of the mmf wave harmonics. The remaining 30% are used for accommodating the starting windings.

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