7.4.6

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7.4.6

  1. 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. 2. Next find the slip ! Slip = 3000 – 2850 x 100 = 5 % 3000
  3. 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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