## Question

Download Solution PDF# Calculate the speed (in rpm) of an AC motor if the number of poles is 8 and frequency is 50 Hz.

## Answer (Detailed Solution Below)

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## Detailed Solution

Download Solution PDF__Concept__:

The synchronous speed of a AC motor is given by:

\({N_s} = \frac{{120f}}{P}\)

Where Ns = Synchronous speed in rpm

f = Supply frequency

P = Number of poles

__Calculation__:

Given P = 8 and f = 50 Hz

\({N_s} = \frac{{120\times50}}{8}~rpm\)

Ns = 750 rpm

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