Why we are always using carbon brush in motor instead of using copper or other fabric brushes. Because there are numerous advantages behind in the carbon brushes. So here we will briefly converse about what are the advantages in using carbon brush in dc motors.
Advantages of carbon brush:
There are 5 foremost advantages of carbon brush. So we will see one by one here.
1. High Melting Point
The carbon metal is generally having high melting point compared to copper as well as other metal. The carbon brush is having almost 3550 degree C melting temperature and copper having 1080 degree C only. We all know the brushes in dc motor linked to nearly to the commutator. So whenever motor running it will create the spark and friction amid brushes and commutator. If temperature is increase then copper brush cannot with stable that’s why we are using these brushes.
2. Soft metal
The carbon brush is usually very soft metal compared to copper. So whenever the motor running the friction produced amid brush and commutator. As per the softness of the brush will be not damage the commutator. Incase if we are using copper brush it will spoil the commutator because of its hardness.
3. Negative temperature co-efficient
The carbon brush is having negative temperature co-efficient. It means whenever the temperature increases then resistance repeatedly reduced. We know motor running time friction and heat produced and it will increase the temperature of the motor. So, carbon brush reduced resistance due to mounting temperature and current surge will increases.
4. Shape adopting
The carbon brush usually coming with rectangular shape but it’s having elasticity nature. If we will fix the new the brush near to the commutator as well as once the motor starts to running its automatically adopt the circular shape of commutator.
5. Self lubricating
The carbon brush as well as Evolution Brushes is having self lubricating. So it’s not required any other Greece or lubricating oil for cooling purpose. So whenever the motor gets off then carbon brushes are automatically get cool down.