How brushed and brushless differ
For a motor to turn, the current in its windings has to keep switching direction. A brushed motor does this mechanically, with two carbon brushes pressing on the commutator on the rotor; a brushless motor has fixed windings on the outside and a permanent-magnet rotor, and an electronic control board does the switching.
Why the same battery does more work
Friction between the brushes and the commutator creates heat and sparks, and that energy is wasted. A brushless motor has no such friction, so more of the energy turns into torque: the same battery does more work and the tool runs cooler.
The controller can also match output to the load: it saves power at idle and pushes more current when the tool meets hardwood or a seized bolt. This is one reason an impact wrench can deliver high torque from the same battery.
Why there are no brushes to replace
Carbon brushes are wear parts. With use they wear down, the motor runs unevenly and the tool has to be opened to fit new ones; in dusty conditions they wear faster. A brushless motor has no brushes, so the shop stocks one part fewer and the user opens the tool once less.
A brushless motor still needs care. Water and damp can still cause trouble, so let a tool that has been rained on dry out before use. LEIYU sends the parts needed for each model.
How to explain it to a customer
When a customer asks what brushless gives them, the answer is: the same battery lasts longer, the tool runs cooler, and there are no brushes to replace.
Which LEIYU models are brushless
Every LEIYU model uses a brushless motor: impact wrenches, drills, the ice drill, rotary hammers, grinders, circular saw, reciprocating saw, chainsaws, pruning shears, grass trimmers, blower, rivet gun, metal shears and spray gun. The motor type is listed in the highlights on each product page and in the specification table.