In DC motors the brushes are part of a rotating switch called the commutator. They deliver electricity to the moving part of the motor, but, because they switch and short several times each rotation, brushes are also responsible for the sparks, radio frequency interference, and limited lifespan typical of many powered hand tools.
Brushless motors use electronics to eliminate all of those problems, making them more efficient and more durable. A brushless motor will run longer on a single charge, provide full torque at any speed, and remain operational much longer than a brushed motor of equivalent size and power.
Date published: 2022-01-11