7*17*21/22 MM Replaceable Electric Motor Carbon Brush

7×17×21/22 MM Replaceable Electric Motor Carbon Brush – Repair Tool Parts

Key Information Analysis:

1. Product Positioning: Repair Tool Parts
   As a core consumable for motor repair, it is made of a composite material consisting of high-purity graphite and metal powders (such as copper, tin). It features high conductivity, strong wear resistance, and high-temperature resistance, enabling precise adaptation to motor brush holders and quick restoration of normal motor functions.
2. Applicable Repair Scenarios:
   With its medium-to-large size of 7×17×21/22mm, it is mainly used for motor repair in the following equipment:
   • Industrial motors: Small industrial pumps, ventilators, conveyor motors, etc. (power 1-3kW);
   • Heavy-duty power tools: High-power angle grinders, industrial-grade grinders, heavy-duty impact drills, etc.;
   • Special vehicle motors: Drive motors of electric forklifts, warehouse handling vehicles, golf carts, etc.
     The core of adaptation is that the size must completely match the original carbon brush. Special attention should be paid to distinguishing between the two length specifications (21mm and 22mm) to avoid mixing, as inconsistent lengths may cause unstable installation or abnormal pressure.
3. Size Specifications: 7×17×21/22 MM
   This size is designed for medium-to-high power motors. The 7mm thickness and 17mm width ensure a tight fit with the brush holder, while the 1mm length difference directly affects the contact pressure between the carbon brush and the commutator. The dimensional error must be ≤0.2mm; otherwise, it may lead to post-repair faults such as poor contact and excessive motor sparking.
4. Repair Functions:
   • As a "core replacement part" for motor repair, it solves motor faults caused by carbon brush wear (such as reduced power, abnormal noise, and abnormal sparking);
   • The wear-resistant material extends the service life of the motor after repair, reduces the frequency of repeated repairs, and lowers equipment maintenance costs.
5. Replacement and Repair Tips:
   During motor repair, the carbon brush should be inspected and replaced simultaneously in the following cases:
   • The original carbon brush is worn by more than 2/3 (remaining length ≤7mm);
   • The carbon brush surface has severe cracks, chipping, or burn marks;
   • The motor commutator is worn (the commutator should be cleaned or polished when replacing the carbon brush).