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Here are the steps to solve this problem: (a) Given frequency f = 400 Hz Number of pole pairs p = 20 Rotor speed N = 120f/p = 1200/20 = 60,000 rpm (b) Number of slots/pole/phase = 3 Number of poles = 20 Number of phases = 3 Total number of slots = 3 × 20 × 3 = 180 (c) Flux/pole φ = 23 mWb Number of turns/coil = 2 Number of parallel paths = 2 Induced EMF/phase = φ × ω × Nt = 23 × 2π × 400 × 2 = 28.8 V So the answers are

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DorwinNero

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