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HIGH TORQUE CAGE MOTORS The rotor of of an induction motor can be designed in two types : a: Squirrel cage rotor b: Slip ring rotor For both of them the stator part connection is same, no change. At squirrel cage rotor we can not add external resistance which means speed and torque cannot be controlled. But in slip ring type of rotor we are able to add external resistance and we have a full control over the speed and torque of induction motor. So deep bar and double rotor is only applicable in squirrel cage induction motors. The starting torque of a squirrel cage induction motor is only 1.5 times of full load torque, and the current drawn is very hight it's 5 to 7 times of full load current, this is because the rotor resistance is very low. So deep bar and double cage rotor are used to provide more rotor resistance and to decrease the current. The motive is to provide efficient starting torque and effective starting current drawn. 1. Deep Bar Cage Motor ...