<P> For example, for a four - pole three - phase motor, p (\ displaystyle p) = 4 and n s = 120 f 4 (\ displaystyle n_ (s) = (120f \ over (4))) = 1,500 and 1,800, RPM synchronous speed, respectively, for 50 Hz and 60 Hz supply systems . </P> <P> The two figures at right and left above each illustrate a 2 - pole 3 - phase machine consisting of three pole - pairs with each pole set 60o apart . </P> <P> Slip, s (\ displaystyle s), is defined as the difference between synchronous speed and operating speed, at the same frequency, expressed in rpm, or in percentage or ratio of synchronous speed . Thus </P> <Dl> <Dd> s = n s − n r n s (\ displaystyle s = (\ frac (n_ (s) - n_ (r)) (n_ (s))) \,) </Dd> </Dl>

The slip speed of an induction motor may be defined as the
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