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Determine the rotor frequency of a two-pole, 50 Hz
induction motor if the rotor speed is 2850 r/min.
First find the slip speed
                                         !
Ns = 120 x 50 = 3000 r/min
   2
Next find the slip



                         !

Slip = 3000 – 2850 x 100 = 5 %
   3000
Then find the frequency
fr = fs x % Slip=
Frequency = 50 x 5% = 50 x 5 = 2.5 Hz
         100
Another way to write the formula for rotor
efficiency is:


                                !

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7.4.6

  • 1. Determine the rotor frequency of a two-pole, 50 Hz induction motor if the rotor speed is 2850 r/min. First find the slip speed ! Ns = 120 x 50 = 3000 r/min 2
  • 2. Next find the slip ! Slip = 3000 – 2850 x 100 = 5 % 3000
  • 3. Then find the frequency fr = fs x % Slip= Frequency = 50 x 5% = 50 x 5 = 2.5 Hz 100 Another way to write the formula for rotor efficiency is: !

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