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How can the small single phase motor reduce the harmonics still much further?

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in Design of Electrical Machines by (687k points)
How can the small single phase motor reduce the harmonics still much further?

(a) removing the winding

(b) insulating the winding

(c) grading the winding

(d) shading the winding

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

This intriguing question comes from Design of Stator topic in chapter Design of Single Phase Induction Motor of Design of Electrical Machines

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Right choice is (c) grading the winding

Easy explanation: 70% of the total slots are used for the reduction of the mmf wave harmonics. The mmf wave harmonics can be still further reduced by grading the winding.

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