With the many commercial gearboxes available today, it’s vital that you match the proper type of gearbox with the drive, motor, and load. When a machine requires a servosystem (drive and electric motor), the gearbox type is crucial for accurate and repeatable movement. Planetary gearboxes suit you perfectly for servo applications.
High-precision helical planetary gearboxes are an excellent choice for servo motor gear reducers applications that require precision and reliability. Planetary gearboxes have very low backlash rankings (typically ranging from someone to nine arc-min), so when sized correctly offer a service life of over 20,000 hours with virtually no maintenance. Helical planetary gears also provide very calm and better operation in comparison with competitive products.
Precision gearboxes are carefully machined to high tolerances – think clockmaker, not blacksmith. They provide power densities that translates to small bundle size and efficiencies of 90% and greater.
Servomotors often drive loads directly with no need for a gearbox, however in many applications it’s beneficial to use a gearbox between the motor and load.
One main cause to employ a gearbox is torque multiplication. It lets designers use smaller servosystems that consumes less energy. Rather than buying relatively huge servodrives and motors, developer can use smaller elements, saving space and cash.
Output torque increases in direct proportion to the gear ratio, and top acceleration of the result shaft decreases. If an application can withstand the reduced speed, a relatively small servosystem can supply high torque.
Gearboxes can 
also address inertia mismatches. For powerful servosystems — those with high dynamic responses or low overshoot, for example – the ratio between the reflected load inertia and motor inertia should be as low as practical, ideally under ten-to-one. A precision gearbox decreases the reflected inertia by the square of the reduction ratio. For instance, utilizing a 25:1 gearbox decreases the load’s reflected inertia by a factor of 625, a substantial improvement.