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Consider phase A winding only of a 3-Φ AC machine with one winding per phase. The...

Consider phase A winding only of a 3-Φ AC machine with one winding per phase. The mmf it produces is given by the expression F = Fmcos(θa), where Fm = (4/π)⋅(N/2)⋅i. Show that when the winding is excited by a sinusoidal current i = Iacos(ωt), it generates two travelling waves. In which direction does each wave travel?

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