VGR Conductive Ring Technical Specifications: Installation, Maintenance, and Dimensional Details

Fiber mating surface roughness:\nThe lower the roughness of the mating surface of the workpiece, the better. It is recommended to have a Ra value of \u22641.6.\n\nFiber mating surface conductivity:\nThe mating surface (usually the circumferential surface of the rotating shaft, sometimes the end surface) must be conductive, with a surface resistance \u226410m\u03A9, and have a certain corrosion resistance to avoid a significant decrease in conductivity due to corrosion during the lifespan.\n\nWorkpiece hardness:\nThere is no special hardness requirement due to the extremely low friction coefficient.\n\nRunning runout:\nThe runout of the mating shaft surface or end surface circumference should be \u003c0.25mm.\n\nInstallation and usage requirements:\nInstallation method:\nInterference fit, bolt installation, etc.\n\nInterference fit amount for fiber mating surface:\nFor oil-cooled motors, the interference fit amount for the diameter should not exceed 2mm, and for water-cooled/air-cooled motors, it should not exceed 4mm.\n\nInterference fit amount for press-fit:\nIt is recommended to have an interference fit amount of 0.02-0.08mm. If the material is special, please contact the engineering personnel of H&C for verification.\n\nUse of bolt fastening:\nAnti-slip washers and spring clips can be used for anti-loosening treatment. If thread adhesive is needed, please ensure good electrical connection between the conductive ring and the installation part after use to avoid electrical insulation caused by the thread adhesive.\n\nConductivity of mating surface after installation:\nThe conductivity of the mating surface after assembly should be good:\n\u2022 The resistance between the aluminum ring of the conductive ring and the motor housing after installation should be \u226410m\u03A9.\n\u2022 The resistance between the rotating shaft and the nearest point of the motor housing after installation should be \u22641\u03A9.\n\nRotation direction:\nThe motor can rotate clockwise/counterclockwise without any restriction.\n\nMaximum speed:\nThe maximum rotating linear speed of the shaft surface tested so far is 58.5m/s. If it needs to be used at higher speeds, please contact the engineering personnel of H&C for verification.\n\nOperation and maintenance:\nUnder the above normal operating conditions, the VGR conductive ring is designed to be maintenance-free for a lifespan of 300,000 kilometers in automobiles. In industrial machinery applications, the lifespan varies from 2 to 10 years depending on different applications.\n\nNote: The above data and suggestions are based on the testing data and technical knowledge of MPT Company up to now. With more in-depth research, H&C may correct or update some of the data.\n\nNote: \n\u2022 The image on the left is only a photo of a specific product and does not represent all products.\n\u2022 Specific production processes can be customized according to customer requirements.\n\u2022 The table lists some product models and specifications. Please contact our company for more customized solutions.\n\nWind-cooled/water-cooled motor conductive ring:\nFiber inner diameter D1 (mm), aluminum ring inner diameter D2 (mm), aluminum ring outer diameter D3 (mm), thickness (mm), number of fiber bundles X.\n\nOil-cooled motor conductive ring:\nFiber inner diameter D1 (mm), aluminum ring inner diameter D2 (mm), aluminum ring outer diameter D3 (mm), thickness (mm), number of fiber bundles X.\n\nTypical non-standard dimensions:\nCooling method, model, motor shaft diameter DO (mm), fiber inner diameter D1 (mm), aluminum ring inner diameter D2 (mm), aluminum ring outer diameter D3 (mm), thickness (mm), number of fiber bundles X.\n\nFor example:\nFor a water-cooled/air-cooled conductive ring with a motor shaft diameter of 25mm, an outer diameter of 50mm, and 12 fiber bundles, the model is VGRS 50-25-12.\nFor an oil-cooled conductive ring with a motor shaft diameter of 25mm, an outer diameter of 46mm, and 12 fiber bundles, the model is VGRY 46-25-12.\n\nNote: The cooling method, model, motor shaft diameter, fiber inner diameter, aluminum ring inner diameter, aluminum ring outer diameter, thickness, and number of fiber bundles are provided for typical non-standard dimensions.