Modern automated machineries are increasingly using flexible high dynamic servomotors because of their ability to speed up and flexibly automate complex motions these machineries need to perform. Planetary gearheads are used frequently in conjunction with servomotors to match the inertias, lower the motor speed, boost the torque, and at the same time provide a sturdy mechanical interface for pulleys, cams, drums and other mechanical components.
This paper addressing following topics:
— main reasons why the planetary (epicyclical gear systems) are the preferred choice for ”servo applications” (applications using servo motors);
— what influencing the positioning accuracy repeatability of a planetary servo gear;
— helical gears in planetary systems;
— the rating practices establishing a transparent ”comparability” of different torque listings;
— introduction of a simple reliable method to the required gearbox torque rating for a servo–application based on the selected motor toque data.

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