Motor bearing internal classification and technical requirements

General points doubly-fed wind turbine type, a direct-drive type and half a direct-drive type, etc. , all kinds of motor bearing is widely used in wind turbine, bearing the number and type of the most complete is the traditional application of doubly-fed fan, a wind turbine application bearing up to 32. So choose the right bearing is very important to guarantee safe and stable operation of the wind turbines. Wind power generators are installed in the wild, dust or humidity larger areas, wind power bearing working condition is very bad, need to bear the range of temperature, humidity and load change is very big. Especially the yaw and is analyzed. studying bearing need to bear the larger axial force and overturning moment, gearbox bearing need to bear huge impact load when starting and braking, but also requires fan gearbox bearing in low speed startup have lower friction torque and the characteristics of high operating flexibility. Wind turbine bearings generally divided into the following kinds: is analyzed. studying yaw bearing, bearing, spindle bearing, gearbox bearing and generator bearings. Depending on the type of bearing is different, have different technical requirements. 1, yaw, is analyzed. studying bearing design, this kind of bearing are generally assembly adopts single row four-point contact ball bearings or double row four-point contact ball bearings, should meet the following technical requirements: four-point contact ball bearing according to the mechanical characteristics of fan bearing, the yaw bearing all the small clearance, is analyzed. studying bearing adopts zero clearance or 'negative clearance' four-point contact ball bearing, the design of the channel for special design and processing, can carry large axial load and torque load. The yaw gear assembly to choose appropriate materials, and hardness, modulus, tooth surface contour to ensure the matching between the driving gear and life. At the same time, to take targeted treatment measures, improve the strength of tooth surface, make the bearing has good wear resistance and impact resistance. From fan exposure in the wild, so the sealing performance of bearing has strict request, must carry on the optimization design of bearing seal form, to ensure the bearing life is the same as the life of fan. Fan is installed at an altitude of more than 50 m or even hundreds of meters, installation is expensive, therefore must have a very high reliability, and general requirements of 20 years life, coupled with the bearing structure is complex, so the requirement of design and manufacture is extremely high. 2, main shaft bearing spindle bearing generally for spherical roller bearing, has also adopted the cone Angle of double row circular cone roller bearings, most of the impeller shaft is made up of two spherical roller bearing. Due to the impeller shaft under load is very large, and the shaft is very long, easy to deformation, so the request must have a good bearing performance. Double row circular cone roller bearings, gear box bearing gear box bearing 3 quantity, types, also include deep groove ball bearings, cylindrical roller bearings, roller cylindrical roller bearing, double row tapered roller bearing, spherical roller bearings, thrust spherical roller bearings, four-point contact ball bearing. Bearings in the gear box is mainly relies on gear oil lubrication in gear box, metal particles in lubricating oil is more, will significantly affect the bearing life, so need to use special heat treatment process, make the raceway surface compressive stress, the decrease of sensitivity of raceway of impurity particles, improve the bearing life. At the same time also need according to the operation condition of the bearing condition, optimize the bearing structure, improve bearing processing technology, further improve the performance of the bearing. 4, generator, generator bearing cylindrical roller bearing and deep groove ball bearings. Through the structure of these two kinds of bearing design, processing technology to improve cleanliness, production process control and optimization of related components to reduce the noise of the bearing vibration, the bearing has good low noise performance. From the spindle to the generator bearings bearings, collectively known as transmission system used in most of these bearings from structural type is a standard bearing, the difference is that in order to ensure the high reliability, in addition to the material and heat treatment have some special requirements, also need the other key technology. For example, steel quality control technology and control measures; Wheel bearing ring surface quenching hardness as well as the effective hardening layer depth, the control of quenching crack preventing; Tapered roller bearings and cylindrical roller bearing ball base surface contact with the guard position and shape optimization; Self-aligning roller bearing inner ring, roller bearings and their working surface hardness and roughness of matching optimization; NDT of ring and rolling body; Residual austenite content of optimal control and so on.