FAQ

1) What is Carbon Brush?

Carbon brush is an electrical contact which makes connection with a moving surface.

2) Why do we use carbon brush?

It is used to transfer electric current from static contact to moving contact.

3) Why do we call it Carbon Brush?

In early days copper wire brush was used to transfer the current, which was costlier with little life so copper wires are replaced with Carbon which is comparatively cheaper and having long life, but still it is known as Carbon Brush similar to copper brush.

4) What is the importance and purpose of spring in Carbon Brush?

The spring plays very important role to maintain proper pressure on carbon brush for making low electrical resistance contact.

5) How does hardness of spring affect Carbon Brush performance?

Too much hardness of spring will put excessive pressure on carbon brush which will adversely affect the life of carbon brush and other parts.

6) Where do we use carbon brush?

Carbon brushes are used in electrical machines i.e D.C Motor, A.C Slip Ring Motors, Overhead cranes, Clutch, Brakes, Automobile, Machine Tools etc.

7) Why do we use Thimble in carbon brush?

It is used to make better and easy contact fixing.

8) Can we use same type of Carbon Brush everywhere?

No. Carbon brushes are made as per requirement of application; as it has different size, shape, hardness, material quality and grades. So it will require selecting carbon brush carefully according to requirement of application.

9) What is the life of Carbon Brush?

The life of carbon brush depends on the size, shape, quality, material grade, pressure on carbon brush etc. and application where it is used.

10) If the material of Carbon Brush is not good then how will it affect performance?

If carbon Brush material is not good then it will reduce life of moving part (commutator) as well as Carbon Brush.