The servo gear unit serves as a torque converter. It reduces the speed of the motor and transmits force in various ways. Each stage of the unit is designed with different types of gears. The gear ratio i is specified as the ratio between the input speed and the output speed. They also provide low backlash processing and optimized gearing to ensure they can transmit high acceleration torques at high speeds.

A helical gear unit can be used with a servo motor. It is highly recommended that the gear unit is lubricated. It will prevent contact corrosion. It will also make disassembling the drive easier. The SEW-EURODRIVE gear unit is also available with an extended storage option. These gear units are designed for a wide temperature range.

The planetary gearbox is an excellent choice for many servo motor applications, due to their high torsional stiffness. They are also suitable for processes involving start-stop motions and rotational direction changes. The planetary gearboxes have low backlash compared to the helical gears.