When a three phase ac supply is connected to the stator winding it produces a rotating magnetic field in the air gap between the stator and rotor.
Slip ring rotor diagram.
By using rings a high resistance is connected in series to the rings which act as an external circuit.
Fig 1 slip ring rotor and squirrel cage rotor working of squirrel cage induction motor.
The rotor of the motor is constructed as a slip ring type.
First let s have a look at the way a squirrel cage induction motor works fig 2a.
This rmf cuts the rotor.
The slots of the rotor are not parallel but are skewed.
The slip ring induction motor has two distinctly separate parts one is the stator and other is the rotor.
For an induction motor to produce torque at least some difference should be there between stator field speed and rotor.
The stator circuit is rated as same in the squirrel cage motor but the rotor is rated in frame voltage or short circuit current.
Wound rotor motors can be started with low inrush current by inserting high resistance into the rotor circuit.
These windings are connected to the rings.
Cylindrical laminated core with parallel slots and each slot consist one bar.
As the motor reaches its base speed full rated speed after the removal of external resistance and under.
In slip ring motors the rotor resistance is increased by adding external resistance so the slip is increased.
Since the rotor resistance is high the slip is more thus it s possible to achieve pull out torque even at low speeds.
Check more diagrams here.
The slip ring induction motor diagram is shown below.
In three phase induction motor the power is transferred from stator to rotor.
A slip ring can be used in any electromechanical system that requires rotation while transmitting power or signals.
The slip ring type motor is shown in the figure below.
In squirrel cage type we use rotor bars but in ring type we use windings that are connected in star.
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 rotor of the motor is a squirrel cage type.
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Slip ring induction motor connection diagram why slip rings are used in an induction motor.
Other name phase wound rotor.
Adjusting the resistance allows control of the speed torque characteristic of the motor.
It can improve mechanical performance simplify system operation and eliminate damage prone wires dangling from movable joints.
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 control diagram control diagram.
Three phase slip ring rotor starter power diagram power diagram.
As the motor accelerates.
The frame voltage is the open circuit voltage when the rotor is not rotating and gives the measure of turns.
