Electrical Machines Formulas 

The mechanical speed of magnetic fields can be related to the electrical frequency and pole number by the formula

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The mechanical speed of magnetic fields can be related to the electrical frequency and pole number by the formula:

  1. ηm = 120 * fe * P
  2. ηm = 120 * fe / P
  3. ηm = fe * P / 120
  4. ηm = 120 * P / fe

Correct answer: 2. ηm = 120 * fe / P

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