There is a difference between a Slip Ring and a Squirrel Cage Induction Motor.
The squirrel cage motor is the most popular type of motor.It is very popular in industries because it is cheap, robust, efficient, and reliable.The slip ring motor is not used in industries.Slip ring motors have a number of disadvantages, like having a high copper loss, and are rarely used in industries.
The slip ring motor has an external resistance circuit that can be used to control the speed of the motor.It is not possible to add an external circuit in a squirrel cage motor because the bar is locked at the end of the ring.The comparison chart explains some of the differences between them.
The squirrel cage type motor is constructed as a slip ring type.The slots of the rotor are skewed and the laminated core has one bar.The rotor bar is short at the end of the ring so it is not possible to add external resistance.The starter can be used.The resistance starter can't be used.Start Torque High Low Brushes Present Absent Maintenance Frequent maintenance required Less maintenance needed
The slip ring motor is known as a phase wound motor.The laminated cylindrical core has a semi-closed slot at the outer edge and three-phase insulated winding.The rotor is wound for the same number of poles as the stator.
Three start and three finish terminals are connected to three copper slip rings on the shaft.The key is fixed to the mild steel shaft.The shaft is supposed to send mechanical power.
The squirrel cage motor is a type of motor.The construction is simple and rugged.A short circuiting ring is located at each end of the motor's cylindrical laminated core.It is not possible to add resistance to the circuit.
The slots are skewed.The skewing of the rotor has advantages.
The slip ring motor has a higher overloading capacity than the squirrel cage motor.It has no abnormal heating and is less sensitive.
Why the squirrel cage motor has high starting current and why the slip ring is low?