Page 114 - Electrical Equipment Handbook _ Troubleshooting and Maintenance

INDUCTION MOTORS

INDUCTION MOTORS 6.3

(b)
FIGURE 6.2 (a) Sketch of squirrel-cage rotor. (b) A typical squirrel-cage rotor.
(Courtesy of General Electric Company.)

n n n
slip sync m

where n slip speed of machine
slip
n speed of magnetic fields
sync
n mechanical shaft speed of rotor
m
The second term used to describe the relative motion is the slip. The slip is defined as
n
slip
s 100%
n
sync
n sync n m
s 100%
n sync

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