Mechanical friction between the brushes and commutator, along with electrical erosion, inevitably cause brush wear. But there are ways to extend brush life.
FAQ: How can brush wear in DC motors be minimized?
Electric Motor Maintenance
Carbon Brushes Motor Brushes & Carbon Brush Replacement
FAQ: Where do brush dc motors still make sense?
Why do DC motors have brushes?
What You Need To Know About Brushless DC Motors
How To Check if Carbon Brushes Are Worn & Need Replacing?
Carbon brush buying guide
Answering Seven Common Questions on Generator and Motor Operation
Commutator (electric) - Wikipedia
FAQ: How can brush wear in DC motors be minimized?
Slip Ring Brushes: A Detailed Overview
Types of DC Motor - Shunt, Compound & Series - Mawdsleys
Controlling and Troubleshooting Common DC Motors - Technical Articles
