Yadda a yi amfani da slip ring da brush a motorin induction

Ringin da karamin haguji da brush a motorin induction suna amfani da su a cikin motorin winding rotor induction, ba a cikin motorin cage induction. A cikin motorin winding rotor induction, amfani da funksiya na ringin da karamin haguji da brush sun haɗa da:

Ringin da karamin haguji

Ringin da karamin haguji shine halki mai karamin haguji da aka sa zuwa shaft na motor, yana da kyau a yi daga copper. Yadda ake kira ringin da karamin haguji yana nufin da take sa ta design na motor kuma ana iya zama mafi yawan phase a cikin rotor windings. Funksiyoyin major na ringin da karamin haguji sun haɗa da:

• Kara inganci: Ringin da karamin haguji tana bayarwa wajen kara inganci daga resistor ko controller na gaba ta kan rotor windings domin ya kawo karfi da shiga circuit na gaba, saboda haka ita ce yake canza resistance na rotor windings.

• Rotation mai maƙasa: Ringin da karamin haguji tana ci ɗaya da rotor na motor don ya ɗaukan da shi a matsayin ya tabbatar da ake da contact da brush a lokacin da rotor tana ci ɗaya.

Electric brush

Brushes suna da muhimmin component daga carbon ko metal-graphite wanda aka sa zuwa housing na motor, wadanda ke da contact da ringin da karamin haguji da suke kara inganci. Funksiyoyin major na brush sun haɗa da:

• Conductive connection: Brush tana ɗauka da ringin da karamin haguji, tana tsara path mai conductive wanda yake bayarwa wajen kara inganci daga circuit na gaba ta rotor winding.

• Wear compensation: Saboda friction da ke faru a bayan brush da ringin da karamin haguji, brush an designed as replaceable part don in bayyana wear and ensure good contact over a long period of time.

Principle of operation of winding rotor induction motor

Rotor winding na motorin winding type rotor induction zai iya kara inganci da circuit na gaba, through the slip ring and brush, zai iya kara inganci da resistor na gaba ko device na speed regulation. Bayanan wannan shine mainly to improve the starting performance or achieve speed control:

•  Improved starting performance: During starting, external resistors connected by slip rings and brushes can increase the resistance of the rotor windings, thereby increasing the starting torque and reducing the starting current. Once the motor accelerates to a high enough speed, the external resistance can be shorted or gradually reduced to restore the normal operating state of the motor.

• Speed control: By adjusting the external resistance of the access rotor winding, the running speed of the motor can be changed. This method is called rotor resistance speed regulation.

Advantage

• Increase in starting torque: The starting torque can be significantly increased by increasing the rotor resistance.

• Reduced starting current: The starting current can be effectively controlled to reduce the impact on the grid.

• Speed control ability: A certain degree of speed control can be achieved through external resistance.

Shortcoming

• Increased complexity:Compared with the cage induction motor, the winding rotor induction motor has added components such as slip rings and brushes, making the motor structure more complex.

• Maintenance needs: slip rings and brushes need to be checked and replaced regularly, increasing maintenance costs.

• Efficiency loss: Increasing the rotor resistance will result in a certain efficiency loss.

Application scenario

Wound-rotor induction motors are commonly used in applications where large starting torques are required or speed regulation is required, such as in industrial applications such as heavy-duty starting equipment, cranes, and winches.

Sum up

The slip ring and brush play a key role in connecting the rotor winding with the external circuit in the winding rotor induction motor, through which the motor's starting performance can be optimized and speed control can be achieved.