What is the function of brushes?
2 Answers
Brushes are used to connect the circuit between the field winding and the armature winding, and to maintain a fixed direction of the electromagnetic torque on the armature shaft. Below is relevant information about brushes: Introduction to brushes: Brushes are an important component of electric motors, responsible for conducting current between rotating parts and stationary parts. Since they are mostly made of graphite, they are also called carbon brushes. Materials of brushes: Most brushes are made of graphite. To enhance conductivity, some are made of copper-graphite composites. Graphite has excellent conductivity, is soft in texture, and wear-resistant. Brushes can be used in DC motors or AC commutator motors, such as in general electric tools like hand drills and angle grinders.
I've been driving for over a decade and have some experience with car components. The brushes play a significant role in starters and generators, serving as the medium that transmits small currents from the battery to the rotor, helping the motor to rotate. My old car once had an issue with excessive brush wear—when I tried to start it, there was a squeaking sound, and the car wouldn't fire up. After inspection, I found out the brushes were too short, causing poor contact and preventing the electricity from passing through. As a result, the battery drained quickly, and the car broke down halfway. Since then, I make sure to have the technician check the condition of the brushes during regular maintenance. I’d like to remind everyone that even though brushes are small, neglecting them can easily lead to generator failures or even safety issues, especially when driving in harsh weather. It’s also good to learn more about car knowledge to spot early signs like unusual noises or dimming lights, helping to avoid unexpected breakdowns.
