# What will be the running speed of a 6 -pole synchronous motor connected to a 3 -phase, 60-Hz supply, and having rated load?

What will be the running speed of a 6 -pole synchronous motor connected to a 3 -phase, 60-Hz supply, and having rated load?

### Right Answer is:

1200 rpm

#### SOLUTION

Speed of synchronous motor is given as

N_{s} = 120f/P

Where

f = frequency = 60 Hz

P = Numbers of poles =6

N_{s} = (120 × 60)/6

**N _{s} = 1200 RPM**