There are differences between the carbon brush and brushless electric hammer.
Brushless DC motor is composed of motor main body and driver. It is a typical electromechanical integration product. Because of the brushless DC motor is controlled to run, so not like synchronous motor frequency control under heavy start as in the rotor plus a start winding, does not produce oscillation and step mutation in the load. The permanent magnet of small and medium capacity brushless DC motor is now using rare earth neodymium iron boron (Nd-Fe-B) material with high magnetic energy. Therefore, the volume ratio of the rare earth permanent magnet brushless motor reduces a frame number compared with the three-phase asynchronous motor of the same capacity.
In theory, brushless is good, brushless motor life is longer, do not change the carbon brush. Switching life is also relatively long, so that you can save a lot of maintenance money.
