What is the synchronous speed of a 60 Hz motor with 8 poles?

Study for the NEIEP Electrical Theory and Application Exam. Prepare with flashcards and multiple-choice questions, each with hints and explanations. Gear up for your exam and boost your knowledge in electrical theory!

Multiple Choice

What is the synchronous speed of a 60 Hz motor with 8 poles?

Explanation:
In AC machines, the speed of the rotating magnetic field—called the synchronous speed—is determined by the supply frequency and the number of poles. It’s found with Ns = 120 f / P. For a 60 Hz supply and 8 poles, that’s 120 × 60 / 8 = 900 rpm. In operation, the rotor actually runs a bit slower due to slip, but the synchronous speed here is 900 rpm.

In AC machines, the speed of the rotating magnetic field—called the synchronous speed—is determined by the supply frequency and the number of poles. It’s found with Ns = 120 f / P. For a 60 Hz supply and 8 poles, that’s 120 × 60 / 8 = 900 rpm. In operation, the rotor actually runs a bit slower due to slip, but the synchronous speed here is 900 rpm.

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