The squirrel cage rotor is made of copper bars installed in the rotor core groove, and both ends are welded with an end ring, and the shape is like a mouse cage. Medium and small rotors are generally cast aluminum.
Winding and the stator winding rotor is similar to that of the three-phase windings connected into a star, three line connected to the three copper ring arranged on the rotating shaft, through a set of brushes is connected with the external circuit.
The squirrel cage motor has simple structure, low price, control the motor operation is relatively simple, so widely used. While the motor winding structure is complex, the price is high, the motor control operation is relatively complex, its application is relatively less. But because of its winding type motor starting, running torque is large, general used in heavy load.