As servo technology has evolved-with manufacturers creating smaller, yet better motors -gearheads have become increasingly essential partners in motion control. Finding the optimal pairing must take into account many engineering considerations.
• A servo engine working at low rpm operates inefficiently. Eddy currents are loops of electric current that are induced within the engine during operation. The eddy currents actually produce a drag push within the motor and will have a greater negative impact on motor efficiency at lower rpms.
• An off-the-shelf motor’s parameters may not be ideally suited to run at a low rpm. When a credit card applicatoin runs the aforementioned engine at 50 rpm, essentially it isn’t using most of its available rpm. As the voltage constant (V/Krpm) of the electric motor is set for a higher rpm, the torque continuous (Nm/amp)-which is directly related to it-is lower than it requires to be. Consequently, the application requirements more current to drive it than if the application form had a motor particularly created for 50 rpm. A gearhead’s ratio reduces the electric motor rpm, which is why gearheads are sometimes called gear reducers. Utilizing 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 allow you to avoid the concerns
Servo Gearboxes provide freedom for how much rotation is achieved from a servo. Many hobby servos are limited to just beyond 180 levels of rotation. Many of the Servo Gearboxes make use of a patented external potentiometer to ensure that the rotation amount is independent of the gear ratio installed on the Servo Gearbox. In such case, the small servo motor gearbox equipment on the servo will rotate as much times as necessary to drive the potentiometer (and hence the gearbox output 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 motor technology. Essentially, a gearhead converts high-acceleration, low-torque energy into low-speed, high-torque result. A servo engine provides highly accurate positioning of its output shaft. When these two devices are paired with one another, they promote each other’s strengths, offering controlled motion that is precise, robust, and reliable.
Servo Gearboxes are robust! While there are high torque servos available that doesn’t mean they can compare to the load capacity of a Servo Gearbox. The tiny 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 output shaft which is supported by a set of ABEC-5 precision ball bearings. The external shaft can withstand severe 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 result shaft of the gearbox.