As servo technology has evolved-with manufacturers producing smaller, yet more powerful motors -gearheads are becoming increasingly essential partners in motion control. Locating the optimum pairing must consider many engineering considerations.
• A servo engine 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 actually produce a drag drive within the engine and will have a larger negative effect 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 electric motor at 50 rpm, essentially it is not using all of its available rpm. Because the voltage continuous (V/Krpm) of the engine is set for a higher rpm, the torque continuous (Nm/amp)-which can be directly related to it-can be lower than it needs to be. Because of this, the application requirements more current to drive it than if the application had a motor specifically made for 50 rpm. A gearhead’s ratio reduces the motor rpm, which is why gearheads are occasionally 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 bigger rpm will permit you to avoid the concerns
Servo Gearboxes provide freedom for just how much rotation is achieved from a servo. Many hobby servos are limited to just beyond 180 examples of rotation. Most of the Servo Gearboxes utilize a patented exterior potentiometer so that the rotation amount is independent of the gear ratio set up on the Servo Gearbox. In this kind of case, the small equipment on the servo will rotate as many times as essential to drive the potentiometer (and therefore the gearbox output shaft) into the position that the signal from the servo controller demands.
Machine designers are increasingly turning to gearheads to take benefit of the most recent advances in servo motor technology. Essentially, a gearhead converts high-quickness, low-torque energy into low-speed, high-torque output. 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, offering controlled motion that’s precise, robust, and reliable.
Servo Gearboxes are robust! While there are high torque servos available that doesn’t indicate they are able to compare to the load capability of a Servo Gearbox. The tiny splined result 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 strain to the gearbox output shaft which is backed by a pair of ABEC-5 precision ball bearings. The external shaft can withstand severe loads in the axial and radial directions without transferring those forces on to the servo. In turn, the servo operates more freely and is able to transfer more torque to the output shaft of the gearbox.