Discussion
The torque angle of a synchronous motor is the angle between
Answer: C
Correct answer: the rotor field and the stator field
The torque angle \( \delta \) is the electrical angle by which the rotor field lags the rotating stator field. It is the machine’s load indicator: at no load the two fields are almost aligned and \( \delta \) is near zero, and it grows as load is applied, since power is transferred in proportion to \( \sin\delta \). It is not an angle between voltages or currents, though the excitation emf phasor does lag the terminal voltage by the same angle in the motoring case.
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