Do all electric tools need carbon brushes?
Whether the power tools have carbon brushes depends on the type of motor used, whether it is a series motor or not. If there are other types of motors, there is no carbon brush. For example, if a three-phase motor is used, then there is no carbon brush.
Carbon brush has a certain resistance, in the motor rotation in the reversing role, as well as rotating rotor on the coil, need to power, string in the stator coil, produce magnetic field strength, and ordinary motor is not the same. Carbon brush is the tool must not be missing, it can also heat, there is generally a problem of carbon brush.
The hand-held electric tool general electric drill, electric hammer, angle grinder, cutting machine, impact drill etc. However, these products are basically the need of brush. Some large devices, such as DC motors and three-phase wound motors, require carbon brushes.
