A. double cage rotor
B. wound rotor
C. short-circuited rotor
D. any of the above
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A. double cage rotor
B. wound rotor
C. short-circuited rotor
D. any of the above
A three-phase slip ring induction motor is a type of three-phase induction motor, which employs a wound rotor with slip rings.
This type of motor has several advantages over its counterpart, the squirrel-cage induction motor, such as lower initial cost, higher starting torque, and smoother start at a high load.
The motor consists of a laminated cylindrical core, with a three-phase winding in slots around the circumference of the core. Three slip rings are attached to the rotor, which is connected to an external impedance in order to control the speed of the motor.
The motor rotates in a clockwise direction when the induced emf between the slip rings is 60 volts. The slip ring induction motor is capable of providing high torques upon starting, low starting current, and smooth start at high load.