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For the following specifications of a synchronous motor, determine the ratio of no load speed to full load speed.

200 kVA, 12 pole, 2200 V, 3 phase, 60 Hz


1. 2 : 3
2. 1 : 1
3. 3 : 5
4. 2 : 7

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Correct Answer - Option 2 : 1 : 1

Main Features of Synchronous Motors:

  • Synchronous motors are inherently not self starting.
  • They require some external means to bring their speed close to synchronous speed to before they are synchronized.
  • The speed of operation of is in synchronism with the supply frequency and hence for constant supply frequency they behave as constant speed motor irrespective of load condition.
  • This motor has the unique characteristics of operating under any electrical power factor. This makes it being used in electrical power factor improvement.

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