Synchronous Speed Calculation for Four-Pole 60 Hz Motor

What is the formula to calculate the synchronous speed of a four-pole 60 Hz motor?

Choose the correct answer:

A) 3,600 B) 1,800 C) 1,200 D) 900 E) 720

Answer:

The synchronous speed, n_s, of a four-pole 60 Hz motor is calculated using the formula: n_s = 120f/P. Substituting the respective values, we find that n_s equals 1800 rpm. Therefore, the correct answer is B) 1,800 rpm.

Explanation:

The synchronous speed of a motor, n_s, can be calculated using the formula: n_s = 120f/P, where f is the frequency and P is the number of poles.

In the case of a four-pole 60 Hz motor, we substitute the respective values into the formula:

n_s = 120*60/4 = 1800 rpm.

This means that the magnetic field of the motor rotates at a speed of 1800 rpm in synchrony with the stator.

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