Answer Posted / vibhakar

there are two types of IM one is squirrel cage and slip ring induction motors.In squirrel cage rotor windings are short circuited with end rings where we cant give supply therefore this type of motor has more efficiency because losses due to slip rings and brush assembly is less...but in case of slip ring IM in order to increase torque, resistance is added through slip ring assembly

we can give 3 phase supply to rotor and they are callled as rotor fed IM

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