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Q1. Consider a three-phase machine. The stator has 18 slots, with a 2-pole stator, 3-phase, double-layer, 8/9th of full-pitch distributed winding. Each coil side contains 10 conductors. The rotor has 12 slots with a 2-pole, single-layer, full-pitch distributed winding, and each coil D = 0.2 m, and the rotor axial length is 1-0.3m. The stator phase currents are; 1,-1 cosot, A ; lB = l cos(ot--), A; lc = l cos(ot--), A. Assuming that the frequency of the supply is 50Hz: 2 4 a) Draw the complete stator winding diagram. b) Draw the space distribution of MMF for an AC excitation applied to stator phase A at t-0, with I-20/3 Amps, and other phases carry no current. Give a general expression for the fundamental MMF distribution in space, FAI(0,t). Comment on the nature of the MMF waveform obtained by the single-phase AC excitation of phase A. c Draw the MMF diagram at t -0; when all three phases are excited by balanced three- phase currents, with I 20/^3, Amps. Give a general expression for the fundamental MMF distribution in space, Fi(0,t). Compare the MMF diagram you obtain with what found in (b) d) Assume that a balanced three-phase ac excitation is applied to the stator winding with I- 20/3, Amps. Calculate the open-circuit fundamental rms rotor induced voltage, when the rotor is stationary