Insulation bearing for generator

Bearing  used for generator,to prevent the phenomenon of electric spark for bearing internal conductive induced (electrical erosion), and improve its reliability is essential.

  We have developed through the use of special ceramics and improvement of metal spraying method, ensure that the monolayer type insulating ability and reliability of the new deck crane bearing product.

  Insulation resistance value more than 100M Omega, dielectric breakdown voltage of insulating performance is more than 2KV, the insulation performance to meet the requirements of wind power bearing generator.

Use conditions of planetary gear

A comprehensive experimental study, planetary gear subject can be summarized as the following 3 points.

• Effect of gear and deck crane bearing outer ring of elastic deformation.
• Effect of non linear planetary bearings caused by the bracket distortion
• Effect of lubricating oil deficiency 

  The selected optimal bearing take full account of these characteristics. As the planet gear, in these conditions of use,high speed bearing load capacity and light load conditions, we try to reach the optimum rib design and the axial clearance of sliding friction and adhesion is very strong.

   In addition, to achieve long life through a special heat treatment.

Maximum contact surface pressure

Maximum contact surface pressure of self aligning roller bearing exceeds the set value,  need to increase the size of bearing. Then prolong the life calculation and reduce the maximum contact surface pressure.

  On the contrary, the body is very difficult to roll in the raceway surface rolling at light load, sliding increasing with danger raceway surface damage.

  Therefore, we recommend the above minimum load in the basic load rating of 4%. In the surface of lubricating , need method of wind power bearing starting without making planetary bearing lack lubricating  on the surface of the part of oil.

Planetary bearing and gear box

Gear box is composed of an input shaft, planetary, low-speed shaft, intermediate shaft, high speed shaft.

  Planetary bearing use self aligning roller bearings and Full complement cylindrical roller bearing. In the analysis model of planetary bearings, the bearing load as  load of rolling body, fixed each gear occlusal point of internal gear end and the sun gear end , considering the outer ring deformation,to calculate bearing life.

  According to the analysis results, consider the life calculation of elastic deformation of the ring, in each column between the maximum difference of 58% generation,  we believe that the bracket end column compared with the other column end load load calculation of high proportion, short service life.

  Maximum contact surface pressure bearing gear box for the self-aligning roller bearing are calculated in the case of cylindrical roller bearing with point contact, line contact is used to obtain the. And the application considered in the calculation of non linear specification tendency.

The stress analysis of crankcase

According to the stress analysis of the crankcase, consider the strength, confirm the deformation amount and bearing clearance of crankcase and bearing, calculating deck crane bearing life, and try to optimize the bearing and axle box.

  The maximum deformation of 1.5MW shaft bearings and axle radial fan for 0.07mm. Considering the calculation results of deformation and bearing clearance  and the crankcase as steel body life difference within 5%, this value in practice is not a problem. The life of difference, life is shortened, then, must change the axle box design, improve the rigidity.

Mainstream of bearing types

For bearing types,self-aligning roller bearing and tapered roller bearing is the mainstream, but most of the use of self-aligning roller bearings in the non linear favorable. Non linear spindle generally need to consider the plus or minus 0.5 degrees.
As B type automatic self-aligning roller bearing  is designed by the use of the middle block side guide roller , it is no skew of the maximum load wide in the minimum load to load region , which can run in a stable torque and low fever cases.
In addition,vibration of blade and gear box vibration increasing of the rotor shaft bearing, there is danger of corrosion and friction .Therefore, optimal bearing selection and clearance and mating and selection of suitable oil is very important.

Bearing life

Accelerate blade rotation in order to achieve the rated revolution of induction generator by a speed increaser, design to take necessary strong of crankcase into account when wheel bearing at maximum loads .

  So is study on  bearing life when the displacement of axle box  at average loads. Choose to meet practical axle box design and the  fully simplified calculation of spindle bearing life.

  In addition, consider the box and the outer ring raceway surface deformation, the calculation of every needle roller bearings load and calculate the rotation ring and fixed ring their life.