Slip
1 way to express rotation speed is to use the following formula.
\(\begin{align}\mathrm{S} = \frac{{N_S}-{N}}{N_S} \end{align}\)
or \(\hspace{15pt}{N}={N_S} (1 - \mathrm{S}) \)
- NS
- Synchronous Rotation Speed [r/min]
- N
- Rotation speed under arbitrary load [r/min]
Here, a 4-pole, 50 Hz induction motor running at slip S=0.1 means
\(\begin{align}{N} &= \frac{120 \times 150}{4} (1- 0.1)\\[5pt]
& =\ 1500 (1-0.1)\\[5pt]
& =\ 1350 [ \mathrm{r}/ \mathrm{min}]
\end{align}\)
Above is the synchronous speed value.
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