What happens if the motor carbon brush is broken?
3 Answers
If the motor carbon brush is broken, it will cause the starter motor to fail to rotate or rotate weakly. The following is a related introduction to carbon brushes: 1. Definition: Carbon brushes, also known as electric brushes, are widely used in many electrical devices as a type of sliding contactor. Carbon brushes are devices that transmit energy or signals between the fixed and rotating parts of motors, generators, or other rotating machinery. The materials used in carbon brush products mainly include graphite, impregnated graphite, and metal graphite. 2. Function: They transmit external current (excitation current) through the carbon brush to the rotating rotor (input current). They also connect the main shaft (ground) to the protection device to provide rotor grounding protection and measure the positive and negative voltages of the rotor relative to the ground.
As a seasoned expert who frequently deals with motor issues, I've encountered countless cases of carbon brush failures. Once the carbon brush is damaged, the motor will first produce a clicking noise during operation, as if something inside is grinding, accompanied by noticeable sparks. Next, the motor will lose power, with reduced RPM, particularly noticeable during startup or under heavy loads—such as when starting a car engine or operating industrial equipment—and may even stall completely. If left unaddressed, worn carbon brushes will impede current transmission, causing the motor to overheat, and in severe cases, smoke or even burn out the entire winding. This is no minor issue: at best, it leads to equipment downtime and costly repairs; at worst, it could cause accidents in vehicles. I recommend regularly inspecting carbon brush wear—typically every two years or after tens of thousands of kilometers—and replacing them promptly to save hassle, money, and avoid disasters.
I've been driving for years and have actually experienced a faulty motor carbon brush. That time, the starter motor had issues on the highway, the car shook like a sieve, and sparks flew out during startup, which really scared me. Later, upon inspection, it turned out the carbon brushes were completely worn out, preventing electricity from passing through, causing the motor to 'go on strike.' This not only prevents the car from starting but also adds extra stress during operation, shortening the motor's lifespan. The consequences of damaged carbon brushes are quite distressing: the car can't start properly, the battery drains faster, and even excessive heat under the hood can damage other components. Regular car owners should remember, if they hear strange noises or see sparks, get it repaired immediately—don't delay. Replacing the carbon brushes early can save a lot of trouble.
