Difference between squirrel cage rotor and wound rotor

These bars are shorted at each end with shorting rings. Squirrel Cage Induction Motor vs Slip Ring Induction Motor. There is no electrical connection between these bars and the motor terminal box.

Compared to squirrel cage rotor the rotor construction is not simple. Cylindrical laminated core rotor is wound for as the number of poles of the stator.

In squirrel cage rotor ,there is connection points only at stator winding in order to provide three phase supply.

However, no power is applied to the slip rings.

In slip ring induction motors the rotor is wound type. Their sole purpose is to allow resistance to be placed in series with the rotor windings while starting. How are the rotor poles equal to stator poles in Wound Rotors ? I mean how are rotor poles created Please. No speed control of squirrel cage ? What about pole changing method!

SQUIRREL CAGE INDUCTION MOTOR : 1. Constructional feature is very simple.

Starting torque is poor, while running torque is better. Power factor is moderate(–). A squirrel cage rotor or wound rotor are used in induction motor.

Salient pole, non salient pole or permanent magnet rotor are used in synchronous motor.

Rotor current is AC in induction . Yes, wound - rotor motors have slip rings. Therefore slip ring motors and wound - rotor motors are the same. Wound rotors are used in applications where high starting torque is required. External resistances may be added to these rotors via slip rings shaft.

These resistances serve to increase the starting torque and ensure smooth starts.

However, these rotors are more expensive than induction motors. A very common structure uses die cast aluminium poured into the rotor after the laminations are stacked. In the wound rotor , the rotor . Some larger motors have aluminium or copper bars which are welded or brazed to end-rings.

Since the voltage developed in the squirrel cage winding is very low, no intentional insulation layer is present between the . In wound rotor , windings are also permanently short-circuite hence no . Unlike large synchronous motors, an induction motor does not require mechanical commutation, separate-excitation or self-excitation for the energy transferred from stator to rotor. The main difference between Synchronous and Induction Motors is . Due to presence of slip rings and brushes the rotor construction becomes somewhat complicated therefore it is less used as compare to squirrel cage induction motor.