Three-phase motors typically have slip, which is the difference between rotor speed and field speed. What is the slip of a synchronous motor?

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Multiple Choice

Three-phase motors typically have slip, which is the difference between rotor speed and field speed. What is the slip of a synchronous motor?

Explanation:
Slip is how far the rotor lags behind the rotating magnetic field. In a synchronous motor, the rotor is locked to the stator’s rotating field by DC excitation, so the rotor speed matches the field speed (the synchronous speed). Because nr equals ns, the slip s = (ns − nr)/ns becomes zero. That’s why the correct result is zero. If you ever see a nonzero slip in a synchronous motor, it would indicate it’s not perfectly synchronized, which isn’t the normal steady-state condition.

Slip is how far the rotor lags behind the rotating magnetic field. In a synchronous motor, the rotor is locked to the stator’s rotating field by DC excitation, so the rotor speed matches the field speed (the synchronous speed). Because nr equals ns, the slip s = (ns − nr)/ns becomes zero. That’s why the correct result is zero. If you ever see a nonzero slip in a synchronous motor, it would indicate it’s not perfectly synchronized, which isn’t the normal steady-state condition.

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