GATE EE 2014 Set 1 — Question 21
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Electrical Machines → Three-Phase Induction Machines → Slip & Equivalent Circuit
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Question
An 8-pole, 3-phase, 50 Hz induction motor is operating at a speed of 700 rpm. The frequency of the rotor current of the motor in Hz is ____________.
Correct answer
3.2 to 3.5
Solution
Given:
Number of poles () = 8
Supply frequency () = 50 Hz
Rotor speed () = 700 rpmStep 1: Calculate the synchronous speed ():Step 2: Calculate the slip ():Step 3: Calculate the frequency of the rotor current ():The frequency of the rotor current is approximately 3.33 Hz, which falls within the range of 3.2 to 3.5.
Number of poles () = 8
Supply frequency () = 50 Hz
Rotor speed () = 700 rpmStep 1: Calculate the synchronous speed ():Step 2: Calculate the slip ():Step 3: Calculate the frequency of the rotor current ():The frequency of the rotor current is approximately 3.33 Hz, which falls within the range of 3.2 to 3.5.
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