With the many industrial gearboxes on the market, it’s important to match the proper type of gearbox with the drive, motor, and load. When a machine needs a servosystem (drive and motor), the gearbox type is critical for accurate and repeatable movement. Planetary gearboxes fit the bill for servo applications.
High-precision helical planetary gearboxes are an excellent choice for applications that need accuracy and reliability. Planetary gearboxes have got very low backlash ratings (typically ranging from one to nine arc-min), and when sized correctly provide a service lifestyle of over 20,000 hours with practically no maintenance. Helical planetary gears also provide very peaceful and better operation in comparison with competitive products.
Precision gearboxes are carefully machined to high tolerances – believe clockmaker, not blacksmith. They offer power densities that translates to small package size and efficiencies of 90% and greater.
Servomotors often drive loads directly with no need for a gearbox, but in many applications it’s advantageous to use a gearbox between the motor and load.
One main reason to employ a gearbox is torque multiplication. It lets designers make use of smaller servosystems that consumes much less energy. Instead of buying relatively huge servodrives and motors, designer can use smaller parts, saving space and cash.
Output torque boosts in direct proportion to the apparatus ratio, and top quickness of the output shaft decreases. If an application can withstand the decreased speed, a relatively small servosystem can supply high torque.
Gearboxes may also address inertia mismatches. For high performance servosystems — people that have high dynamic responses or low overshoot, for instance – the ratio between the servo motor gear reducers reflected load inertia and motor inertia should be only practical, preferably under ten-to-one. A precision gearbox decreases the reflected inertia by the square of the reduction ratio. For instance, using a 25:1 gearbox reduces the load’s reflected inertia by a factor of 625, a substantial improvement.