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Which of the following is NOT a characteristic of an unexcited single phase synchronous motor?
1. Operates from a single phase ac supply
2. Requires DC excitation for the rotor
3. Self-starting
4. Runs at constant speed

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Correct Answer - Option 2 : Requires DC excitation for the rotor

Concept:

Single phase synchronous motor:

A single phase synchronous motor is also called as reluctance motor.

Construction:

  • The stator of the motor has the main and auxiliary winding. The stator of the single phase reluctance and induction motor are same.
  • The rotor of a reluctance motor is a squirrel cage with some rotor teeth removed in the certain places to provide the desired number of salient rotor poles.

Working:

  • Reluctance motor torque is produced due to the tendency of the rotor to align itself in the minimum reluctance position.
  • Speed of the motor is close to the synchronous speed. The rotor pulls in synchronism.
  • The load inertia should be within the limits, for proper effectiveness.
  • At synchronism, the induction torque disappears, but the rotor remains in synchronism due to synchronous reluctance torque.

Advantages of reluctance motor:

  • It doesn’t require DC supply.
  • Stable characteristics
  • Maintenance is less
  • Less heat
  • No magnets
  • It is self-starting.

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