Last Updated on October 28, 2023 by Electricalvolt
There are two types of 3phase induction motors. These are the squirrel cage induction motor & slip ring induction motor. We shall discuss the application of squirrel cage induction motor & slip ring induction motor in this article. The working principle of the squirrel cage and slip ring induction motor is based on Faraday’s law of electromagnetic induction. The torque of the induction motor depends on the rotor resistance.
The end rings shortcircuit the rotor of a squirrel cage induction motor, and therefore it is impossible to connect external resistance to the rotor winding. At the same time, it is possible in slip ring induction motor.
The starting torque of the squirrel cage motor is low. Therefore, the motor is unsuitable for applications that demand higher starting torque. The use of a double cage rotor can improve the starting torque of the squirrel cage induction motor.
Applications of Squirrel Cage Induction Motor
The squirrel cage induction motor is suitable for the application where;
 A moderate starting torque is required
 A constant speed is required. ( The speed can be controlled through VFD). The induction motor is a reasonably constantspeed motor.
Applications of Slip ring Induction Motor
The slip ring induction motor is suitable for the application where,
 The Applications that demand higher starting torque need a slipring induction motor. Therefore, a ring induction motor is suitable for driving high inertia loads.
 Speed control is required ( the speed can be controlled through a Grid resistance regulator. Also, there is substantial power saving if used for driving the centrifugal fans and pumps. The other option of power saving is the slip power recovery system. The rotor copper loss or the slip power is recovered and returned to the mains. Thus, with SPRS, the total recovery of the slip power is possible. The SPRS is more efficient than GRR.

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