During operation, a spring presses the carbon brush against a rotating surface – typically a commutator or slip ring. This mechanical contact ensures consistent electrical conductivity, even under demanding conditions. The key lies in the material: graphite. Known for its excellent electrical conductivity and self-lubricating properties, graphite forms a thin film between the brush and the counter surface. This graphite film reduces friction and wear on both components. The brush wears down in a controlled manner, protecting more expensive parts like the commutator or slip ring from damage.
Different industrial environments require different types of brushes. That’s why Schunk offers a wide range of carbon brush materials, each designed for specific performance criteria:
To further enhance performance, brushes can include metallic components (e.g., copper or silver) and specially developed binders. Additionally, targeted impregnations – such as with resins, copper, or metal salts like antimony – can improve resistance to humidity, oxidation, and chemical exposure.
One example: Q-impregnation enhances the oxidation resistance of carbon, making the brush suitable for use in high-temperature environments.
As a recognized materials expert, Schunk leverages its extensive know-how to match brush materials and design precisely to your application – from compact tools to heavy industrial systems.
Beyond material selection, the shape, construction, and mounting of the brush are just as critical. Variables like available space, current load, vibration, pressure, and ambient temperature all affect the final design.
Whether you need a standard brush or a fully customized solution, Schunk develops each component to fit the exact requirements of your application. Features like dust grooves, special impregnation, and matching brush holders can be integrated as needed – ensuring optimal performance even in the harshest environments.
Carbon brushes are found across a wide range of applications, including:
Depending on the application, current levels may range from just a few milliamps to several hundred amps. No matter the scale, carbon brushes are essential for stable and efficient electrical contact.
Carbon brushes may seem simple, but their performance is crucial for the efficiency and reliability of electric machinery. When properly matched to the application, they minimize downtime, reduce operating costs, and extend equipment lifespan.
With Schunk as your partner, you benefit from advanced materials expertise and application-specific engineering – delivering exactly the right carbon brush for your needs.
Looking for the right brush for your application? Schunk offers a comprehensive portfolio of premium carbon brushes and custom solutions. Get in touch with our team to find out how we can support your system with the right materials and technology.
Interested in more information? Find all relevant brochures and documents on the topic of Carbon Brushes in Industry:
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