Question

How many poles will be required if an alternator runs at 1500 rpm and gives frequency 50 hz ?

Answer 1

Answer:

4 poles

Explanation:

n=120*f/p

Where n= synchronous speed in rpm

f= frequency

p= no of poles

Now

p= 120*50/500 = 4

Answer 2

2 poles will be required for the given information of the induction motor.

To calculate number of poles in induction motor

p = 60 * f / n

where,

• n will be synchronous speed,
• f will be supply frequency,
• and p will be pairs of pole per phase.

p = 60 * 50hz /1500rpm

p = 2

= 2 poles are required if an alternator runs at 1500 rpm and gives frequency of 50 hz.