When using the column bearing new motor no-load running large noise

Cylindrical and conical roller bearing, thrust bearing roller and bearing inner and outer ring interface larger bearings, need certain load can be formed in the interface between the oil film grease and good rolling. If no load and load is small, the oil film will be difficult to form, roller and bearing inner and outer circle of the possible sliding friction, contact surface caused by wear and produce larger friction noise, at the same time will affect the service life of bearing. The minimum load bearing and the bearing size also have relations, generally speaking, the greater the load capacity of bearing, it needs the minimum load. There are a lot of units used in the new motor installed before the inspection process, to the electric motor no-load running more than two hours, A lot of acceptance procedures have such regulation) For the use of cylinder and cone roller bearing, thrust bearing of the motor is bad. If you want to achieve acceptance, and reduce the damage of bearing, can be used with appropriate load method. No load condition, can reduce the idle time, as long as the electricity functioning can stop, don't have to work for two hours.