Radical innovation in motion
WITTENSTEIN’s Galaxie® is a servo-actuator made up of a latest generation zero play gearbox, combined with a high performance servomotor, which together create an extremely compact hollow shaft module with a yield exceeding 92%.
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Its performance, well exceeding the norm, makes it suitable especially for high range applications. Compared to the market standard of solutions with similar bulk, Galaxie® reaches up to 170% more maximum torque, triple the momentary peak torque, torsional rigidity from three to six times higher and a large format hollow shaft diameter.
An unprecedented kinematics. The kinematic motion of the integrated gearbox in the Galaxie® servo-actuator is patented and represents a revolution in the world of motion. The torque transmission occurs through a double row of teeth that act on the external corona and are moved by a central polygon. This mechanism makes it possible for nearly all teeth to mesh simultaneously, restarting the torque at various points - a thing that does happen, for example, with dentellated wheels, planetary or hypoid gearboxes, harmonious principle, eccentric gearboxes with involute or cycloidal geometry.
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Contact surfaces, not just points. The logarithmic spiral on which the functional principle of Galaxie® Drive System is based involves meshing on entire contact surfaces and no longer just certain points. The crucial point is the area of contact between corona and tooth, which, based on comparative FEM calculations, is more than 6.5 times larger than a planetary gearbox.
This enables a much greater maximum transmittable torque. Futhermore, the distance between the tooth housing and the external corona is so narrow that it minimizes the part of the tooth subject to bending. In such a way, a torsional rigidity up to 580% higher than the best comparable gearboxes on the market can be obtained, even with alternated loads, at the point of crossing zero and with no reduction in maximum transmittable torque. The result? Extreme dynamic precision with hollow shaft and ultra compact format.
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“Spatial” advantages In the last two years, operators active in various industrial sectors have experienced firsthand the advantages offered by the Galaxie® servo-actuator on large machine tools, rollers, gantry milling systems and large processing centers and other types of facilities. But the application that beset documents its power and precision is its first in the aerospace sector in 2012, when it was adopted for controlling directional wings on the experimental Shefex II rocket of the German Space Agency (DLR). An arduous task, given that adjustment of the input trajectory upon entering the atmosphere occurs under extreme conditions, with temperatures reaching 900 degrees, vibrations with accelerations up to 12 g at a frequency of 2000 Hz and radial forces up to 5 kN. It’s no surprise, then, that at the 2015 fair in Hannover, Galaxie® won the prestigious Hermes Award for technological innovation. |
