How to reduce the noise of gear stepper motor?
Mittwoch, 6. November 2019
Use noise optimized gear geometry to minimize the impact of individual gear engagement impulses.
Designing and analyzing gears as a system lets engineers improve and optimize microgeometry for the reduction of gear noise.
Pitch: A gear system with normal pitch of the driving gear a very small amount larger than the normal pitch of the driven gear delivers more silent transmission. Minimum noise requires a contact ratio smaller than 2 or 1. Even under a slight load, the influence of torsional stiffness is important.
Contact ratio: The gear contact ratio is the average number of teeth in contact. It usually varies between 1.2 on the low end to 1.8. Spur and straight bevel gears with operating contact ratios under 2.0 create more noise than gears with larger contact ratios. Helical and spiral bevel gears have total contact ratios well above 2.0 and produce less noise.(Click here to buy nema 23 stepper motor online)
Also keep in mind that it’s impossible to eliminate all gear noise, because it’s impossible to cut perfect gears. Even if one could, it’s impossible to limit the effect of system dynamics. One can only minimize and control gear noise to the extent that it won’t be considered problematic or audible.
Minimize gear noise in high-speed stages by fine machining and grinding. Gear stepper motor rotation speed plays a significant role in noise generation. During gear manufacturing, hobbing is a roughing operation that produces smooth and accurate gear teeth. Shaving and hardening are finishing operations improving dimensional accuracy, surface finish, and hardness. Shaving removes small amounts of material to correct profile errors. Final grinding operations produce a high surface finish, correcting any distortion following heat treatment.
Quiet operation requires minimal gear backlash. Backlash is clearance between mating gear teeth and should be enough to allow lubrication film between the teeth. The easiest way to reduce backlash is to shorten the distance between gear centers with low or even zero clearance. Such an approach lessens variations in center distance, tooth dimensions, and bearing eccentricities.
