Wound rotor induction motor is used in applications which require smooth start and adjustable speed. 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.
Three Phase Wound Rotor Induction Motor
Wound rotor induction motor diagram. Adjusting the resistance allows control of the speedtorque characteristic of the motor. This article will highlight the important concepts for wound rotor motors that must be understood before purchasing one of these but. Another type is squirrel cage motor that has no wire winding and has no slip rings. Their sole purpose is to allow resistance to be placed in series with the rotor windings while starting figure below. Three phase wound rotor induction motor. This is true for voltage control.
A different behavior is obtained for constant rotor current control. Wound rotor motors can be started with low inrush current by inserting high resistance into the rotor circuit. 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. Type of induction motor for ac in which the rotor has wire winding. 7 however under subsynchronous motor and generator modes all are feasible with adequate control. This type of motor is designed to provide strong starting torque and strong running for applications such as large water pumps.
These bars are shorted at each end with shorting rings. In a squirrel cage induction motor the rotor has conductive bars embedded in slots in the laminations running the length of the rotor. The motor which employing the wound rotor is known as a slip ring induction motor or phase wound motor. Wound rotor induction motor wrim. They are used in large pumps in water industry. However no power is applied to the slip rings.
The specifications for a wound rotor motor involves understanding the specifications for all induction motors which can be reviewed in our article all about induction motors. Example 84 doubly fed im an im with wound rotor has the data. There is no electrical connection between these bars. Wound rotor induction motor is also used in fans blowers and mixers. 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. Some of the applications of this motor include cranes mills hoists and conveyors.
It consists laminated cylindrical core which has a semi closed slot at the outer periphery and carries three phase insulated winding. In three phase induction motor the power is transferred from stator to rotor. The windings are accessible through slip rings. Capacitor start capacitor run induction motors are single phase induction motors that have a capacitor in the start winding and in the run winding as shown in figure 12 and 13 wiring diagram. Wound rotor motor specifications. V sn 220 vphase f 1 50 hz r s.
As the motor accelerates. The rotor is wound for the same number of poles as that of the stator.
Gallery of Wound Rotor Induction Motor Diagram
