What is the function of brushes?

[JakeLee]

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.

[ODeclan]

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.

[McAthena]

After years of observation in this field, I've come to see that brushes play a bridging role in automotive circuits. They transmit current through the commutator to rotating components, ensuring proper motor operation. Common issues like wear-induced sparking or increased resistance can prevent the starter from turning or reduce generator output. Once, I noticed a car had repeated starting difficulties, and troubleshooting revealed nearly worn-out brushes – replacing them solved the problem. I recommend owners inspect brushes every few tens of thousands of kilometers. Brushes are inexpensive and quick to replace, but neglecting them may lead to premature battery failure or more serious electrical issues. Pay attention to unusual vehicle noises, as they can help detect potential problems early.

[HazelFitz]

The carbon brush plays a crucial conductive role in vehicle motors, simply put, it enables continuous electrical flow to moving parts. If worn or dirty, it obstructs current and affects motor performance, such as slow starts or dim lights. I've researched this out of curiosity about cars before. When encountering similar issues, I directly check the brush condition - replacing it can restore functionality. Understanding these fundamental components helps prevent travel inconveniences.

[StElliana]

From a safety perspective, brush failure can cause the vehicle's electrical system to malfunction. For example, a non-starting motor or a stalled generator may lead to a dead battery and being stranded on the road, which is particularly dangerous at night. While driving, I pay special attention to minor electrical fault signals, such as unusual starting noises or flickering dashboard lights, and promptly inspect the brushes to prevent accidents. During routine maintenance, regularly replacing brushes is a simple measure that ensures driving reliability.

[OZoey]

I'm used to fixing cars myself. The role of brushes in the generator is to connect the stationary power source to the rotating rotor, ensuring smooth current conduction. When worn, increased resistance causes heating, which may burn out the circuit board. My experience is to check the brush length every two years and replace them with new ones if they're short, costing just a few dozen yuan. Don't wait until a failure occurs, otherwise the towing fee will be much more expensive and it will also affect the battery life. Learning more DIY skills saves both trouble and effort.