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GATE 2018 EE – Question 12

Electrical Machines · Synchronous machines: cylindrical and salient pole machines, performance and characteristics, regulation and parallel operation of generators, starting of synchronous motors · 1 mark · Multiple choice

In a salient pole synchronous motor, the developed reluctance torque attains the maximum value when the load angle in electrical degrees is

  1. 0
  2. 45
  3. 60
  4. 90

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Show answer and explanation

Correct answer: (B) 45

Explanation

The reluctance torque is proportional to $\sin2\delta$, which is maximum at $\delta=45^\circ$.