As servo technology has evolved-with manufacturers producing smaller, yet more powerful motors -gearheads have become increasingly essential partners in motion control. Locating the optimal pairing must consider many engineering considerations.
• A servo motor working at low rpm operates inefficiently. Eddy currents are loops of electric current that are induced within the electric motor during operation. The eddy currents in fact produce a drag pressure within the electric motor and will have a greater negative impact on motor performance at lower rpms.
• An off-the-shelf motor’s parameters may not be ideally suitable for run at a low rpm. When an application runs the aforementioned motor at 50 rpm, essentially it is not using most of its offered rpm. Because the voltage constant (V/Krpm) of the electric motor is set for a higher rpm, the torque constant (Nm/amp)-which can be directly related to it-is lower than it requires to be. Because of this, the application requirements more current to operate a vehicle it than if the application form had a motor particularly made for 50 rpm. A gearhead’s ratio reduces the motor rpm, which explains why gearheads are occasionally called gear reducers. Using a gearhead with a 40:1 ratio,
the electric motor 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 bigger rpm will allow you to avoid the concerns
Servo Gearboxes provide freedom for just how much rotation is achieved from a servo. Most hobby servos are limited by just beyond 180 levels of rotation. Most of the Servo Gearboxes use a patented external potentiometer so that the rotation amount is in addition to the gear ratio set up on the Servo Gearbox. In such case, the small equipment on the servo will rotate as much times as essential to drive the potentiometer (and therefore the gearbox result shaft) into the placement that the transmission from the servo controller calls for.
Machine designers are increasingly turning to gearheads to take advantage of the latest advances in servo motor technology. Essentially, a gearhead converts high-rate, low-torque energy into low-speed, high-torque result. A servo electric motor provides highly accurate positioning of its output shaft. When these two gadgets are paired with each other, they enhance each other’s strengths, providing controlled motion that is precise, robust, and reliable.
Servo Gearboxes are robust! While there are high torque servos in the marketplace that doesn’t mean they are able to compare to the load capability of a Servo Gearbox. The small splined output shaft of a normal servo isn’t long enough, huge 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 supported by a set of ABEC-5 precision ball bearings. The exterior shaft can withstand severe loads in the axial and radial directions without transferring those forces on to the servo. In turn, the servo runs more freely and can transfer more torque to the result shaft of the gearbox.