Slip Ring Rotor Construction

Rotor wound rotor.

Slip ring rotor construction.

The below diagram shows a squirrel cage. Because of various advantages like low initial current high starting torque and improved power factor it is used in applications that require high torque cranes and elevators. Slip ring induction motor is one of the types of 3 phase induction motor and is a wound rotor motor type. In this article we shall discuss this motor s construction working speed control advantages disadvantages and applications.

The phase wound rotor is also called as slip ring rotor. The stator has three phase winding on it. It is a type of motor where its external circuit is connected using some rings. Slip ring induction motor construction.

However the rotor construction of the slip ring motor is quite interesting. This rings attached with high resistance acts as an external circuit for the rotor. The another name of the squirrel cage motor is cage motor. The rotor windings are connected in star.

The slip ring motor is also called phase wound rotor. Slip ring rotor or wound rotor or phase wound rotor. The construction of slip ring induction motor is same as other induction motors. The slip ring induction motor could be used for industrial wires where variable speed and high starting torque are prime requirements.

Instead of bars in this motor three windings are used. The construction of the slip ring motor is complicated because it consists slip ring and brushes whereas the construction of the squirrel cage motor is simple. The main difference between slip ring induction motor is in rotor construction and usage. The slip ring induction motor is shown in the figure below.

What is slip ring induction motor. Every motor has main two parts. The outer periphery of the rotor has a semi closed slot which carries a 3 phase insulated windings. To overcome this problem the slip ring induction motor comes into the picture.

The working principles and stator construction of the slip ring induction motor are exactly the same as that of the squirrel cage motor. The absence of slip ring and brushes make the construction of squirrel cage three phase induction motor very simple and robust and hence widely used three phase induction motor. The main difference in a slip ring induction motor is on the rotor construction and usage. Some changes in the stator may be encountered when a slip ring motor is used in a cascaded system as the supply for the slave motor is controlled by the supply from the rotor of the other slip ring motor with external resistance mounted on its rotor.