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A Squirrel Cage Induction Motor (SCIM) is an asynchronous machine. As in the frequency and poles determines synchronous speed and the SCIM rotates at a slightly slower speed to produce torque. $$n_S = \frac {120 f}{p} = \frac {120 \times 60Hz}{6} = 1,200 rpm$$ Synchronous speed is 1,200 rpm, but motor speed depends on load torque. If the slip is 5%, motor ...