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Question

The rotating magnetic field in a three-phase, 6-poles, 50 Hz slip ring induction motor will rotate at-

The correct answer is

1000 RPM

The synchronous speed is the speed at which the magnetic field produced by the stator windings rotates. N_s = (120 × 50)/(6) N_s = (6000)/(6) N_s = 1000 RPM Thus, the rotating magnetic field in the three-phase, 6-poles, 50 Hz slip ring induction motor will rotate at 1000 RPM.

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Important Questions from Three Phase Induction Motor

  1. The stator of a 3-phase induction motor has 4 slots per pole phase. If the supply frequency is 50 Hz, calculate the number of stator poles produced and the total number of slots on the stator, respectively.

  2. In an induction motor for a value slip(s) = 0, the torque (T) is

  3. The stator of a 3-phase induction motor has 2 slots per pole per phase. If supply frequency is 50 Hz, then calculate the number of stator poles and total number of slots on the stator.

  4. If all the stator coils of a motor are connected for the same magnetic polarity, there will be formed an equal number of ________.

  5. The shaft of an induction motor is made of

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