When a servo planetary gearbox is needed?

When we need a low backlash planetary gearbox for servo motor or stepper motor?

Firstly, when the customer requires a low operating speed ( usually the motor speed is high and not stable at a low speed.)

Secondly, when the customer needs a larger torque. (The output torque of the motor can be amplified as: Output torque of the motor × reduction ratio)

Thirdly, to ensure an accurate positioning when customer needs the equipment in positive and negative rotation.