At standstill the rms currents in the main and auxiliary

At standstill the rms currents in the main and auxiliary

At standstill the rms currents in the main and auxiliary windings of a four-pole, capacitor-start induction motor are/main = 20.7 A and Iaux = 11.1 A respectively. The auxiliary-winding current leads the main-winding current by 53째. The effective turns per pole (i.e., the number of turns corrected for the effects of winding distribution) are Nmain = 42 and Naux = 68. The windings are in space quadrature.
a. Determine the peak amplitudes of the forward and backward stator-mmf waves.
b. Suppose it were possible to adjust the magnitude and phase of the auxiliary-winding current. What magnitude and phase would produce a purely forward mmf wave?

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