Developed and manufactured for economic use in demanding industrial appliacations
The speed superimposition gearbox or phase shifter is basically a planetary gearbox with one difference; namely that the outer ring can be rotated through a worm drive. Depending on the direction of rotation of outer ring then the output rotation is added to or subtracted from.
In practical application one can distinguish three possibilitiesAdjustment operation Speed superimposition
This refers to the change of the output rotation over a longer period of timeEmergency operation
Incase the main drive fails , a limited amount of movement of the output shaft can be achieved through driving the worm shaft