Carbon brushes and slip rings for power plant motors
Power stations run their auxiliaries continuously — ID and FD fans, boiler feed pumps, coal mills, cooling water pumps and ash handling drives. Most of the large ones are wound rotor slip ring motors, and the parts that wear are always the same: the slip rings, the carbon brushes riding on them, and the holders that keep brush pressure steady.
A brush or ring failure on a critical auxiliary means derating or a shutdown, so replacements have to fit the first time. We manufacture slip ring units, AC and DC carbon brushes, brush holders and terminal connection plates to the original dimensions — from your worn sample or from a drawing — so a maintenance team can fit them straight into the existing brush gear.
Where our parts are used in power plants
- 01
ID / FD fan and coal mill motors
Large wound rotor motors where slip ring units and matched carbon brushes carry the rotor current through the starting resistance.
- 02
Boiler feed and cooling water pump motors
Continuous-duty slip ring motors that consume brushes steadily — consistent grade and lead termination keep brush life predictable.
- 03
Generator and exciter brush gear
Brush holders with correct spring pressure and copper contact straps, plus finish-turned rings that run true.
- 04
Motor and panel ventilation
Washable industrial air filter panels and housings that keep ash and dust out of motor air intakes and switchgear enclosures.
What these parts have to survive
- Continuous duty — brushes wear steadily rather than in bursts, so grade consistency between batches matters more than peak performance
- Coal dust and fly ash in the air abrade rings and contaminate the brush track
- Generator and exciter slip rings need a clean, concentric surface to avoid sparking and ring scoring
- Ambient heat around boiler auxiliaries pushes insulation toward Class F and H requirements
Made to your sample
Send the worn part or a dimensioned drawing and we manufacture a replacement to the same sizes — no re-machining at your end. Manufacturing in Bulandshahr, Uttar Pradesh since 1995.
Products we supply to power plants
Power Plants — common questions
Can you make slip rings for power plant auxiliary motors from an old sample?
Yes. Send the worn slip ring unit or a dimensioned drawing and we manufacture a replacement to the same sizes — ring diameters, widths, hub bore, keyway and terminal positions — so it fits the existing shaft and brush gear without modification.
Which carbon brush grade suits a power plant slip ring motor?
Slip ring duty on AC motors normally uses copper metal-graphite grades for their low contact drop and high current-carrying capacity, while DC machines and exciters usually take electro-graphite grades. The safest approach is to send us the used brush — we match the grade, size, lead and terminal to what is already working in your machine.
Do you supply air filters for motor and panel ventilation?
Yes. We manufacture powder-coated filter panels, box units and custom housings with washable pleated media and wire mesh guards, made to your measured opening sizes.