As servo technology has evolved-with manufacturers producing smaller, yet more powerful motors -gearheads are becoming increasingly essential companions in motion control. Locating the optimum pairing must take into account many engineering considerations.
• A servo motor running at low rpm operates inefficiently. Eddy currents are loops of electric current that 
are induced within the motor during operation. The eddy currents actually produce a drag pressure within the motor and will have a greater negative effect on motor functionality at lower rpms.
• An off-the-shelf motor’s parameters may not be ideally suited to run at a minimal rpm. When an application runs the aforementioned engine at 50 rpm, essentially it is not using most of its available rpm. As the voltage constant (V/Krpm) of the motor is set for a higher rpm, the torque continuous (Nm/amp)-which is directly linked to it-is usually lower than it requires to be. Consequently, the application requirements more current to operate a vehicle it than if the application had a motor specifically created for 50 rpm. A gearhead’s ratio reduces the engine rpm, which explains why gearheads are sometimes called gear reducers. Using a gearhead with a 40:1 ratio,
the engine rpm at the input of the gearhead will be 2,000 rpm and the rpm at the output of the gearhead will be 50 rpm. Operating the electric motor at the higher rpm will enable you to avoid the concerns
Servo Gearboxes provide freedom for how much rotation is achieved from a servo. Most hobby servos are limited by just beyond 180 examples of rotation. Most of the Servo Gearboxes use a patented exterior potentiometer to ensure that the rotation quantity is independent of the gear ratio installed on the Servo Gearbox. In this kind of case, the small equipment on the servo will rotate as many times as necessary to drive the potentiometer (and hence the gearbox result shaft) into the placement that the transmission from the servo controller demands.
Machine designers are increasingly turning to gearheads to take advantage of the latest advances in servo engine technology. Essentially, a gearhead converts high-acceleration, low-torque energy into low-speed, high-torque result. A servo engine provides extremely accurate positioning of its output shaft. When these two products are paired with each other, they enhance each other’s strengths, providing controlled motion that is precise, robust, and dependable.
Servo Gearboxes are robust! While there are high torque servos on the market that doesn’t suggest they are able to compare to the strain capacity of a Servo Gearbox. The small splined output shaft of a normal servo isn’t long enough, large enough or supported well enough to take care of some loads even though the torque numbers appear to be appropriate for the application form. A servo gearbox isolates the load to the gearbox result shaft which is backed by a pair of ABEC-5 precision ball bearings. The exterior shaft can withstand extreme loads in the axial and radial directions without transferring those forces to the servo. In turn, the servo operates more freely and is able to transfer more torque to the output shaft of the gearbox.
More information concerning servo motor gearbox can be discovered here.