Small but vital.
These small parts are contained in almost all electrical motors in cars, such as windscreen wipers, fuel pumps and fan motors. They establish electrical contact to the rotating component of a machine via sliding rings or collectors. And although this technique for transmitting current is over a century old, it is by no means obsolete. Indeed, it
is still known as a reliable solution that meets the high standards of innovative industries such as the automobile sector (start-stop technology).
Carbon brushes for starters, for instance, not only have to endure around 40,000 start cycles, but also have to come through a comprehensive testing process. As a result, a wealth of expertise is packed into the materials used for such components. In addition to pure carbon and graphite materials, impregnated versions and composites of graphite and other metals are often used.