Hiiliharjakset

Hiiliharjakset, often translated as carbon brushes, are essential components found in many electric motors and generators. They are typically made of a composite material, most commonly graphite or a mixture of graphite and metal powder. The primary function of carbon brushes is to conduct electrical current between a stationary electrical component and a rotating component. This is usually achieved by the brushes making sliding contact with a commutator or slip rings.

The friction between the carbon brushes and the rotating surface causes them to wear down over time. This wear is a natural consequence of their operation and is why they are designed to be replaceable. The graphite content provides good electrical conductivity and lubricity, which helps to minimize wear and heat generation. The addition of metal powders, such as copper, can improve conductivity and current-carrying capacity, especially in high-power applications.

Carbon brushes are used in a wide variety of applications, including automotive starters, alternators, power tools, industrial motors, and household appliances like vacuum cleaners. Their design and composition are tailored to the specific requirements of the motor or generator they are used in, considering factors like current load, speed, and operating environment. Regular inspection and replacement of worn carbon brushes are crucial for maintaining the efficient and reliable operation of electric machinery.