The original carbon brush holder (brush holder) of Xi'an Simo Motor has a firm structure, which can keep the carbon brush stable for a long time. When inspecting or replacing the carbon brush, it is easy to load and unload the carbon brush in the brush box. It can adjust the exposed part of the carbon brush under the brush box (the gap between the lower edge of the brush box and the surface of the commutator or collector ring) to prevent the commutator or collector ring from being worn out. The influence of the change of the carbon brush pressure, the pressurization direction, and the pressurization position on the wear of the carbon brush should be minimal.
The function of the carbon brush holder (brush holder) is to apply pressure to the carbon brush that slides and contacts the surface of the commutator or collector ring through a spring, so that it can stably conduct current between the fixed body and the rotating body. For the motor, both the carbon brush holder (brush holder) and the carbon brush are very important components. No matter how good the characteristics of the carbon brush are, when the brush holder is not suitable, the carbon brush not only cannot give full play to its excellent characteristics but also has a great impact on the performance and service life of the motor itself.
The material and technical indicators of the original carbon brush holder (brush holder) of Xi'an Simo Motor meet the requirements of the drawing design. The conventional design tolerance of the brush box hole is generally based on the basic hole braking fit: the radial tolerance is H7, and the axial tolerance is H11. The roughness of the brush box hole during broaching or push broaching is controlled between Ra3.2-Ra1.6. For special requirements, an extrusion block is added to reduce the roughness to Ra0.8. Multiple broaches or push broaches are used to process the multi-hole brush box at the same time to ensure the coaxiality of the brush box after processing. The out-of-roundness tolerance of the multi-hole brush box is not more than 0.36mm. The parallelism and spacing tolerance between the fixed surface of the brush holder and the center line of the brush box are both: A = ±0.2. The bottom surface of the brush box hole is perpendicular to the wall of the brush box and perpendicular to the fixed surface, and its perpendicularity is not more than 0.25mm. The pressure finger of the brush holder rotates flexibly, and there should be no dead spots or jams when it falls freely after being lifted. Each joint is firmly riveted without the hidden danger of disconnection. The surface can be treated by methods such as Ni plating, Zn plating, Cr plating, imitation gold plating, copper plating, chemical oxidation, pickling, etc. according to the use environment to ensure the long-term use of the carbon brush holder (brush holder). Avoid the existence of bad defects such as sharp corners and burrs on the brush box body, which will cause a discharge phenomenon in a humid environment. The pressure of the brush box pressure finger of the newly manufactured product has been adjusted well. As the service time prolongs, the elasticity will fatigue and decay. If the decay is too large, a spark phenomenon will occur at the bottom of the carbon brush. Please adjust the pressure to the following requirements: the pressure of the carbon brushes for motors such as metallurgy, power generation, and cranes is between 0.15 and 0.35 Kg/mm2; the pressure of the carbon brushes for traction motors is between 0.3 and 0.4 Kg/mm2. The pressure error of the carbon brush holders (brush holders) on the same motor should not be more than 10%, otherwise, it will cause uneven current density and local overload.
The function of the carbon brush holder is to apply pressure to the carbon brush that slides and contacts the surface of the commutator or collector ring through a spring, so that it can stably conduct current between the fixed body and the rotating body. For the motor, both the carbon brush holder and the carbon brush are very important components. No matter how good the characteristics of the carbon brush are, when the carbon brush holder is not suitable, the carbon brush not only cannot give full play to its excellent characteristics but also has a great impact on the performance and service life of the motor itself.
The structure of the carbon brush holder is composed of the brush box part that keeps the carbon brush in the specified position, the pressurization part that presses the carbon brush with appropriate pressure to prevent the carbon brush from vibrating, the frame part that connects the brush box and the pressurization part, and the fixing part that fixes the brush holder to the motor.
It should keep the carbon brush stable. When inspecting or replacing the carbon brush, it is easy to load and unload the carbon brush in the carbon brush box. It can adjust the exposed part of the carbon brush under the carbon brush box (the gap between the lower edge of the carbon brush box and the surface of the commutator or collector ring) to prevent the commutator or collector ring from being worn out. The influence of the change of the carbon brush pressure, the pressurization direction, and the pressurization position on the wear of the carbon brush should be minimal, and the structure should be firm. The carbon brush holder is mainly made of bronze castings, aluminum castings, and other synthetic materials. It is required that the material of the carbon brush holder itself has good mechanical strength, processing performance, corrosion resistance, heat dissipation performance, and electrical conductivity, etc.
