what is the difference between squirrel cage & slip ring
induction motor?
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Answer Posted / dhananjai d.k
squirrel cage rotor is simply a cage structure i.e copper
or aluminum bars short circuited at each end by which
providing a close path to induced current. In squirrel cage
rotor no starting current can be added so the starting
current is generally very high 5 to 6 time of rated full
load current and it has high starting torque. Squirrel cage
rotor is not designed for any number of pole in it
automatically number of pole equivalent to stator get developed.
While wound or slip ring induction motor is
simply a copper 3 phase winding wound for equivalent number
of pole as that of stator and all the winding are short
circuited through a slip ring . In slip ring type motor
external resistance can be added and thereby starting
current can be reduced, Generally slip ring induction motor
is used as adjustable speed drive bcoz its operating
characteristic can be modified according to our need.
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