Motor bearing lubrication has exquisite - bearing knowledge

A lot of motor fault bearing lubrication system is the root cause of problems. Bearing lubrication system is the main factor affecting the service life of bearing, the motor running plays a vital role. Principle of the motor bearing lubrication is grease under the effect of shear force, its three-dimensional fiber mesh structure pulled exhalation of lubricating oil, in the rotating element bearing, bearing, and form a layer of oil film bearing race, the lubrication effect thereby. Working principle of the bearing lubrication equipment in the process of actual operation, when the bearing of the new grease begin to turn, grease, first of all, was thrown from the rotating element, and quickly circulate in the bearing cover of the cavity, cooling; After that, the grease from the rotation of the bearing race again the lateral cut to the rotating element. Against the rotating element part of the surface grease in shear under the action of tensile fiber mesh structure, make a small amount of precipitation of lubricating oil in the rotating element and form a layer of lubrication film on the surface. The rest of the grease is still intact fiber mesh structure, cooling and sealing role. From the working principle of the grease in the bearing, the grease inside the motor bearing is not dependent on adhesion on metal surface grease lubrication, but as the liquid inside the cavity of bearing cover cycle flow, namely constantly out of rotating element to the bearing cover inside the cavity, and then returning from bearing cap cavity on the rotating element, thus repeatedly cut and cooling. This process can not only on the stability of the oil film bearing inner form, also can ensure the balance of the internal temperature of the bearing. Common problems and solutions, 1) Smacked a fat liquefaction, lead to bearing non-lubricated dry grinding, have short bearing apart and lock, eventually lead to electrical overload, winding burned JiSao chamber. The origin of the problem because most of the motor itself caused by high temperature or high bearing temperature grease qualitative change, should choose and motor performance itself and the operation condition are suitable for high temperature grease. ( 2) Solidification grease to motor rotation difficult. The situation of poor quality or grease the working temperature of the grease and the actual working condition of temperature caused by inappropriate, in low temperature environment should choose suitable for low temperature operation of grease. Motor starting, if due to bad lubrication motor slow long run, is only the starting process is because the motor current is too large to burn down. ( 3) The quality of the grease itself has a problem. If the working temperature of the grease is not in conformity with the requirements, or in electric runtime base oil volatilization, cause not grease lubrication. In order to avoid similar problems, the motor manufacturer should be very careful when choosing a grease, prevent due to fat is not in conformity with the quality problem. For a motor, the material cost of the grease proportion is very small, not too due to save money on lipid to small loss. ( 4) Grease can't form a good circulation in the process of motor running. The problem is, in fact, many motor factory was not aware of the problems, within the bearing cover, the design of the bearing cover itself structure, stator alignment degree, bearing and shaft, bearing and the bearing chamber to some different extent cooperate relationship affects the final cycle effect. Many motor manufacturers by adjusting the bearing cover inner cavity depth, increase the bearing oil baffle plate, guarantee fixed rotor alignment degree to reduce the motor rotor running in the process of dynamic operation and adjust radial fit tolerance of bearings and related parts and see the obvious effect. Proved that the design of motor bearing grease is a good circulation system is the important way to solve the fault of bearing quality, but often motor manufacturers do not necessarily the problem consciousness and cognition, especially design staff, should guarantee the oil flow and recycled, theoretically on the design of the bearing cover more pay attention to some, including the bearing cover inner cavity shape, such as width, depth and size may be a better solution to the problem was.