Answer All Questions Each Question Carries 20 Marks Question 1 A three phase, 50hz, 440V, 50hp induction motor runs at 1450rpm when it delivers rated output power. Determine: a. Number of poles of the machine b. Speed of rotating air gap field c. Rotor induced voltage if stator to rotor ratio is 1:0.80, assuming similar winding factors d. Frequency of rotor current
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Number of poles of the machine: We know that the synchronous speed (Ns) of an induction motor is given by the formula: Ns = (120 * f) / P where f is the frequency (50 Hz) and P is the number of poles. We also know that the slip (s) is given by the formula: s = Show more…
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