The maximum power developed in a synchronous motor will depend on__________?
Correct answer: D. the rotor excitation, supply voltage and maximum value of coupling angle (90°)
- A. the rotor excitation only
- B. the supply voltage only
- C. the rotor excitation and supply volt-age both
- D. the rotor excitation, supply voltage and maximum value of coupling angle (90°)
- E. none of the above
Explanation
For a cylindrical synchronous motor, maximum power is proportional to EV sin 90° divided by synchronous reactance, where E depends on rotor excitation and V is the supply voltage. It occurs at a maximum coupling angle of 90°.
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