If slip is zero, the rotor speed is equal to which speed?

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Prepare for the NEIEP Electrical Theory and Application (430) Exam. Study with flashcards and multiple choice questions with hints and explanations. Get ready for your exam!

Multiple Choice

If slip is zero, the rotor speed is equal to which speed?

Explanation:
In an induction motor, slip is how far the rotor lags behind the rotating magnetic field, which turns at the synchronous speed Ns. The slip is defined as s = (Ns − Nr)/Ns. If slip is zero, then Nr = Ns, meaning the rotor spins at the same speed as the synchronous field. The synchronous speed depends on frequency and pole count (Ns = 120f/P), so with zero slip the rotor speed equals Ns.

In an induction motor, slip is how far the rotor lags behind the rotating magnetic field, which turns at the synchronous speed Ns. The slip is defined as s = (Ns − Nr)/Ns. If slip is zero, then Nr = Ns, meaning the rotor spins at the same speed as the synchronous field. The synchronous speed depends on frequency and pole count (Ns = 120f/P), so with zero slip the rotor speed equals Ns.

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