Bearing friction torque

Bearing friction torque of ball bearing friction torque, divided into starting friction torque and dynamic friction torque. Starting friction torque is to rotate when the ball bearing, ball bearings to overcome and elastic deformation of roll channel slot contact resistance and the path of the ball and roll of the service of the lubricant of resistance torque dynamic ground into torque needed means to overcome because of ball bearing lubricant, ball and cage in the rotation, the friction between the friction between the ball and roll channel slot of the required torque resistance. Ball bearing friction torque and fever, rated rotational speed, changes in the startup times rated current value, current value, current value, unequal rotation about a variety of phenomena. Hot hot ball bearing rotation is due to the excessive high viscosity type sealed grease, viscous type grease's rotation by stirring, for mixing and heat resistance. Countermeasure is to reduce the amount of filling grease, or change oriented type grease, etc. After reach rated speed motor starter will happen sometimes reach rated speed of the phenomenon, reason may be that add too much grease or by using the viscous grease etc. Starting current value of the motor starting current value may be the cause of excessive grease filling amount is too large, the viscous grease, etc. The rated current value of the motor rotates current value is too large, may be related to grease filling amount, consistency, viscosity and so on. Rotating unevenness of the reason is due to the rotation in the guidance of the grease are destroyed, instant lubricant thickness uneven, torque ripple, can reduce the amount of filling grease, switch to leading good grease or opposite sex viscous grease rotating speed and dynamic friction torque rotate speed increases, the dynamic friction torque is increased. Grease filling and dynamic friction moment of general filling amount increases, the dynamic friction torque is increased. Temperature and average temperature become low torque, the dynamic friction torque. Grease filling the position of the influence of the dynamic friction torque value is due to the difference of grease filling position. That is to say, the grease stained with attached to keep the rack and cleave, rotate when the outer diameter or outer diameter, and these parts without cleave grease rotate, the friction torque values are different.