Carbon Brushes for DC motors

DC motor carbon brush Mersen

Carbon brushes for DC motors in traction and process equipment 

Traction motors, lifting, rolling mills, winders… 

DC motors brushes grades  

Mersen offers a wide range of electrographitic brushes, particularly adapted to DC motors, of which world-renowned EG34D and EG8220 brush grades. 

Electrographitic grades are prepared from carbon powders and coke; they are then subjected to high temperature thermal treatments (>2500 °C) to transform the basic amorphous carbon into artificial graphite.  

Our research efforts result in brush materials which provide greater commutating ability, longer life, and reduced commutator maintenance. Mersen produces advanced brush grades for service conditions ranging from high loads to low loads, environments contaminated (chemicals, moisture, oil vapors), and other difficult operating conditions. A grade able to meet your requirements can thus be readily selected among our variety of materials - please refer to Mersen’s Technical Guide "Carbon brushes for motors and generators". 

Mersen, as a reference supplier of electric motor manufacturers, also offers dedicated services of refurbishment, replacement of brushes and brush-holders, re-engineering and trainings. 

DC motors carbon brushes: main features  

Mersen is capable to supply you with carbon brushes of various designs, including shapes, components and sizes, with a high quality of manufacturing, in particular cable connection by tamping. When required, we could adjust the design (grade, cable, top pad, wafer size…) to adapt the carbon brush specifically to your DC motor for its application.  

Operational properties can thus be optimized by enhancing the mechanical stability (shape, components, friction coefficient) and electrical performances (voltage drop at contact, commutation ability, load capacity), reducing the sensitivity to environmental condition (protecting / polishing / lubricating action on the commutator skin), etc. The function of a good brush is further explained in our technical data sheet reference TDS01. Mersen provides also technical information under the reference “TDS” on various topics available through the Search Tool.  

In addition, Mersen offers solutions for alerting on brush wear (indicator devices, linked to the brush or to the brush-holder), or, to go further, monitoring of operational parameters with our complete solution MERSEN Total Monitoring. 

As a summary, Mersen’s carbon brushes main features are: 

  • Specific designs 

  • Selected grades 

  • High quality tamping 

  • Optimized cable dimensions 

  • Good mechanical stability 

  • Low friction coefficient 

  • Adapted range of current density 

  • High transient current load capacity 

  • Good acceptability for commutation  

  • Wide speed range (from 15 m/s to 55 m/s) 

DC motors: applications  

Brushes from Mersen lead the way in such adverse applications of DC motors as: traction (locomotives, metros, mining…), lifting (forklifts, cranes, elevators…), conveyors (mining, cement and metalworking industries), extruders (plastics, metallurgy), and also winders, ventilators, pumps, etc. 

Discover our range of products for each market: 

  • Electric and Diesel Electric Locomotives (traction motors) 

  • Transit & Metro (traction motors of metros, tramways or trolleybusses) 

  • Aerospace (auxiliary motors) 

  • Metallurgy (rolling mills, winders, wire drawing machines, extruders, winding machine) 

  • Paper plants (paper machines, winders) 

  • Cement plants (furnace motors, ventilators, ground or aerial conveyors) 

  • Plastic Industry (extruders) 

  • Forklifts (lifting motors, traction motors) 

  • Mining (draglines, shovels, wheel motors for front loaders and trucks, conveyors) 

  • Ports & marine (lifting motors for cranes and gantry cranes, propulsion motors, onboard motors) 

  • Oil & gas (drilling, lifting, pump and anchor motors) 

  • Elevators (lifting) 

  • Ski lifts (motors) 

DC motors carbon brushes: main features

  • Specific designs
  • Selected materials
  • High quality tamping
  • Optimized cable dimensions
  • Good mechanical stability
  • High electrical conductivity
  • Low friction coefficient
  • High transient current density
  • Wide speed range (from 15 to 55m/s)
  • Brush wear indicator systems available as an option

DC motors: applications