Automobile / EV
Carbon brushes, slip rings and thermal management components for EV motors and traction systems.
Graphite solutions for Automobile / EV
Electric motors, industrial generators, traction drives, and power tools rely on carbon brushes for reliable current transfer at the sliding contact interface. The brush grade determines contact resistance, friction, wear rate, and commutator or slip ring wear — making correct grade selection critical for motor life and efficiency.
As electric vehicle adoption accelerates, traction motor brush requirements are evolving rapidly — demanding grades that combine low electrical resistance with minimal friction and long service life under high-current, high-speed conditions. Expo supplies carbon brushes in carbon-graphite, electrographite, metal-graphite, and resin-bonded grades across all standard dimensions, with custom profiling to OEM specifications.
| Available grades | Carbon-graphite, electrographite, metal-graphite, resin-bonded |
| Contact resistance | 0.1–10 mΩ depending on grade |
| Max current density | Up to 20 A/cm² (metal-graphite) |
| Max peripheral speed | Up to 60 m/s (electrographite) |
| Operating temperature | -40°C to +200°C |
| Custom profiling | Yes — from OEM dimensions or drawings |
| Minimum order | No MOQ on standard grades |
| Lead time | 1–3 weeks standard; stock available |
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