Electric brushes are widely used in various AC/DC generators, synchronous motors, battery DC motors, crane motor collector rings, various types of welding machines, and so on. Has good commutation performance and long service life. Electric brush is used on the commutator or slip ring of a motor as a sliding contact body for exporting and importing current. It has good conductivity, thermal conductivity, and lubrication performance, and has a certain mechanical strength and the ability to reverse sparks. Almost all motors use electric brushes, which are an important component of the motor. Widely applicable to various AC/DC generators, synchronous motors, battery DC motors, crane motor collector rings, various types of welding machines, etc. With the development of science and technology, the types and operating conditions of motors are becoming increasingly diverse. Specific functions include:
1. Apply external current (excitation current) to the rotating rotor through the carbon brush (input current);
2. Introduce the static charge on the main shaft into the ground (grounded carbon brush) through the carbon brush (output current);
3. Connect the main shaft (ground) to the protective device for rotor grounding protection and measure the positive and negative ground voltage of the rotor;
4. Change the direction of the current (in rectifier motors, brushes also play a commutation role).
