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@ritesh-patil-Lh1srY • Jul 12, 2017
The voltage induced in a coil due to any moving magnetic field is directly proportional to the velocity of the field in the direction of the axis of the coil. Hence voltage induced by a rotating magnetic field is obtained sinusoidal as shown in the representation in the attachment. The same applies if you want to drive a motor, you will have maximum efficiency and smoothest torque when the driving voltage is pure sinusoidal.

The representation needs, v=|dy/dt|, but you get the picture right?