Question

Question 5 (5 points)

Which one of the following is the synchronous speed of a two-pole motor operating
at 60 hertz?
O 1200 rpm
O 1800 rpm
O 3600 rpm
07200 rpm

Answer 1

3600 rpm is the synchronous speed operating at 60 hertz, two-pole motor.

Explanation:

The speed at which the magnetic field rotates is called synchronous speed. The speed of the motor is slightly smaller and equivalent to the synchronous speed it depends on motor design. These motors have a DC winding.

To calculate speed of motor when frequency and number of poles given formula used is
`\text { speed }=\frac{120 * \text { frequency }}{\text { number of poles }}`, given that frequency = 60 hertz, number of poles = 2.

Now
`sp e e d=(120 * 60)/(2)` = 3600 rpm.