Questions relating to DC motor

Thread Starter

Grand Magus

Joined Oct 25, 2023
1
1. Why charcoal is used to make brush in in dc motor?

2. How to reduce sparks inside the brush and commutator? (Is it something relate to compensation winding and interpole winding)

3. How does the number of wires in a winding affect the dc motor?

4. Give some application of separatedly – excited DC motor? Why it is applicated?
Thank you in advance!
 

MrAl

Joined Jun 17, 2014
11,268
1. Why charcoal is used to make brush in in dc motor?

2. How to reduce sparks inside the brush and commutator? (Is it something relate to compensation winding and interpole winding)

3. How does the number of wires in a winding affect the dc motor?

4. Give some application of separatedly – excited DC motor? Why it is applicated?
Thank you in advance!
Hi,

I don't think calling it charcoal is the right thing to do.
They are made from a mix of materials and there seems to be research going on now to make them out of other materials too.
The main point seems to be that you have to make them of low resistance but not TOO low or else they tend to short out adjacent commutator channels as the armature turns.
 

MaxHeadRoom

Joined Jul 18, 2013
28,513
Usually a carbon-copper mix, the level of each is dependent on the service it will be used in, e.g. a series field starter motor, Very high in copper content.
 
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