The rotor of the motor is constructed as a slip ring type.
Slip ring rotor diagram.
By using rings a high resistance is connected in series to the rings which act as an external circuit.
First let s have a look at the way a squirrel cage induction motor works fig 2a.
In slip ring motors the rotor resistance is increased by adding external resistance so the slip is increased.
The rotor of the motor is a squirrel cage type.
The slots of the rotor are not parallel but are skewed.
The three phase induction motor is the most widely used electrical motor almost 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.
The frame voltage is the open circuit voltage when the rotor is not rotating and gives the measure of turns.
Other name phase wound rotor.
A slip ring can be used in any electromechanical system that requires rotation while transmitting power or signals.
The stator circuit is rated as same in the squirrel cage motor but the rotor is rated in frame voltage or short circuit current.
In squirrel cage type we use rotor bars but in ring type we use windings that are connected in star.
Check more diagrams here.
Adjusting the resistance allows control of the speed torque characteristic of the motor.
Three phase slip ring rotor starter control diagram control diagram.
Cylindrical laminated core with parallel slots and each slot consist one bar.
This rmf cuts the rotor.
Slip ring induction motor connection diagram why slip rings are used in an induction motor.
The slip ring induction motor has two distinctly separate parts one is the stator and other is the rotor.
In three phase induction motor the power is transferred from stator to rotor.
These windings are connected to the rings.
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.
Since the rotor resistance is high the slip is more thus it s possible to achieve pull out torque even at low speeds.
For an induction motor to produce torque at least some difference should be there between stator field speed and rotor.
It can improve mechanical performance simplify system operation and eliminate damage prone wires dangling from movable joints.
As the motor reaches its base speed full rated speed after the removal of external resistance and under.
Wound rotor motors can be started with low inrush current by inserting high resistance into the rotor circuit.
Slip is defined as the difference between the flux speed and the rotor speed.
The slip ring induction motor diagram is shown below.
As the motor accelerates.
Three phase motor control installation wiring diagrams.
A slip ring is an electromechanical device that allows the transmission of power and electrical signals from a stationary to a rotating structure.
Three phase slip ring rotor starter power diagram power diagram.
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