As servo technology has evolved-with manufacturers producing smaller, yet better motors -gearheads have become increasingly essential partners in motion control. Finding the ideal pairing must take into account many engineering considerations.
• A servo engine running 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 force within the motor and will have a greater negative impact on motor overall performance at lower rpms.
• An off-the-shelf motor’s parameters may not be ideally suited to run at a low rpm. When an application runs the aforementioned engine at 50 rpm, essentially it isn’t using all of its obtainable rpm. Because the voltage continuous (V/Krpm) of the motor is set for an increased rpm, the torque continuous (Nm/amp)-which is definitely directly related to it-is usually lower than it requires to be. Because of this, the application requirements more current to drive it than if the application had a motor specifically designed for 50 rpm. A gearhead’s ratio reduces the motor 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 motor at the higher rpm will allow you to avoid the concerns
Servo Gearboxes provide freedom for just how much rotation is achieved from a servo. The majority of hobby servos are servo motor gearbox limited to just beyond 180 examples of rotation. Many of the Servo Gearboxes utilize a patented exterior potentiometer to ensure that the rotation amount is independent of the gear ratio installed on the Servo Gearbox. In this kind of case, the small gear on the servo will rotate as much times as essential to drive the potentiometer (and therefore the gearbox output shaft) into the placement that the transmission from the servo controller demands.
Machine designers are increasingly embracing gearheads to take advantage of the most recent advances in servo engine technology. Essentially, a gearhead converts high-quickness, low-torque energy into low-speed, high-torque result. A servo motor provides highly accurate positioning of its result shaft. When these two devices 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 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 regular servo isn’t long enough, huge enough or supported well enough to handle some loads even though the torque numbers seem to be suitable for the application. A servo gearbox isolates the strain to the gearbox result shaft which is backed by a set 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 can transfer more torque to the output shaft of the gearbox.