A wound rotor induction motor has a stator like a squirrel cage induction motor but a rotor with insulated windings brought out via slip rings and brushes. The three phase induction motor is the most widely used electrical motoralmost 80 of the mechanical power used by industries is provided by three phase induction motors because of its simple and rugged construction low cost good operating characteristics the absence of commutator and good speed regulation.
Rotor Circuit An Overview Sciencedirect Topics
Wound rotor motor diagram. The rotor is wound for the same number of poles as that of the stator. Types of dc motor a direct current motor dc is named according to the connection of the field winding with the armaturemainly there are two types of dc motors. Example 84 doubly fed im an im with wound rotor has the data. First one is separately excited dc motor and self excited dc motor. The windings are accessible through slip rings. Wound rotor induction motor wrim.
Are connected to 3 slip rings. The winding is placed evenly on slots of the rotor. In wound rotor induction motor the rotor has a 3 phase winding similar to stator winding. As the motor accelerates. Wound rotor motors can be started with low inrush current by inserting high resistance into the rotor circuit. It consists laminated cylindrical core which has a semi closed slot at the outer periphery and carries three phase insulated winding.
The motor which employing the wound rotor is known as a slip ring induction motor or phase wound motor. That was the basic structure of stator now lets talk about rotor. Rotor of wound rotor induction motor. A different behavior is obtained for constant rotor current control. Rotor is also cylindrical in shape and has slots to carry winding. At the no load condition of three phase induction motor nn s when ns is equal to zero and slip s is.
Three phase wound rotor induction motor. V sn 220 vphase f 1 50 hz r s. Type of induction motor for ac in which the rotor has wire winding. A wound rotor motor also known as slip ring rotor motor is a type of induction motor where the rotor windings are connected through slip rings to external resistance. 7 however under subsynchronous motor and generator modes all are feasible with adequate control. Adjusting the resistance allows control of the speedtorque characteristic of the motor.
Another type is squirrel cage motor that has no wire winding and has no slip rings. However no power is applied to the slip rings. In three phase induction motor the power is transferred from stator to rotor. This is true for voltage control. Their sole purpose is to allow resistance to be placed in series with the rotor windings while starting figure below. In the above figure i 2 is the reflected rotor current in the stator and this current flows through all the components r 1 r 2 x 1 and x 2 the r 2 1 ss is an electrical equivalent of mechanical load.
The self excited motors are further classified as shunt wound or shunt motor series wound or series motor and compound wound or compound motor.
Gallery of Wound Rotor Motor Diagram
