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what is the difference between squirrel cage & slip ring
induction motor?
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Answer Posted / im
in squirrel cage : rotor winding i.e., heavy copper bars are short circuited so that current is not equal to zero , thus we obtain magnetic field around those copper bars as some current flowing through it.which opposes rmf and starts rotating.
in slip rings: in rotor there will be a starred connection of copper conductors , the other ends of this conductors are connected to slip rings upon which the brushes are mounted.
these brushes are connected to 3 phase supply via rheostat(used to increase resistance). when the motor is ON due to resistance provided by rheostat the motor produces much torques initially after some time the brushes are umounted from sliprings , and all these 3 sliprings are short circuited by means of metal collar. thus this is now same as squirrel cage i.m
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