The brushless motor has no brushes and commutator, and the positions of the magnet and the winding are opposite; the magnet is on the traditional motor shaft, the copper winding of the armature is fixed and surrounds the shaft, a small circuit board replaces the brush and the commutator , Coordinate the energy transfer to the winding.
Since the electronic device communicates directly with the fixed winding, the tools are adjusted to the task-which is why the company sells these tools as "smarter" tools. For example, if you use a brushless drill to screw the screws into Styrofoam, you will be more likely to feel the lack of resistance (compared to a brushed motor) and start to extract only the small amount of power needed from the battery. If the tool starts to insert a 3-inch screw into the mahogany, it will adjust accordingly and draw more current. In contrast, a brushed motor will always run as fast as possible.
In addition, the brushless motor can be more powerful as a whole. Because the copper winding is located outside the motor, there is enough space to make it larger; the brushless motor also has no friction and voltage drop, and the brush is generated by dragging against the rotating commutator . This physical contact will cause continuous energy loss during operation.
Although the benefits of brushless technology are huge, because motors and electronic equipment require additional costs to properly manage the motors, manufacturers will encounter great cost barriers. In other words, they are very expensive, so brushless motors are more suitable for professionals who can spend a lot of money on the tools they use every day. Brushless tools are about 30% more expensive than standard cordless tools, and the batteries that power most DIY users are usually out of reach. But as battery technology improves and tool design advances, buyers will begin to see more and more brushless tools in local home centers.