Planetary Reducer

A planetary reducer (also called a planetary gearbox) is a compact, high-torque gear system that transmits and reduces motor speed through a set of orbiting planet gears. Widely adopted in precision automation, it delivers superior torque density, concentric alignment, and minimal backlash - making it the go-to choice in demanding industrial environments.

Product structure

Four core components work in concert to achieve precise speed reduction and torque multiplication.

Here In this page, we introduce our catagories of Planetary Gear Reducers, you will see ranges,finished gearboxes,videos of test as follows:

Packing and delivery of our Planetary Gear Reducers:

Industrial automation use cases

CASE 01 · ROBOTIC ARM   ： 6-axis welding robot

Each joint axis of a welding robot integrates a planetary reducer to achieve high reduction ratios (up to 100:1) within a compact envelope. The result is precise angular positioning, repeatable ±0.02 mm accuracy, and smooth torque delivery - critical for consistent weld seam quality on automotive body panels.

CASE 02 · CNC MACHINE   ： CNC rotary table drive

CNC machining centers use planetary reducers on rotary table axes to convert high-speed servo motor output into controlled, high-torque rotation. Low backlash (<3 arcmin) ensures dimensional accuracy during multi-face milling, while the inline design saves valuable spindle space on the machine bed.

FAQs of Planetary Reducer

What is the typical reduction ratio of a planetary reducer?

 Most single-stage units offer ratios from 3:1 to 10:1. Multi-stage configurations extend this to 100:1 or beyond, making them suitable for both high-speed and low-speed precision applications.

What does "low backlash" mean in a planetary reducer?

Backlash is the lost motion between input and output when direction reverses. Precision planetary reducers achieve <3 arcmin backlash, which is essential for positioning systems where directional accuracy directly impacts part quality.

How does a planetary gearbox differ from a standard helical gearbox?

Planetary reducers distribute load across multiple planet gears, achieving higher torque density and better radial load balance in a smaller footprint. Helical gearboxes handle parallel shaft configurations but are typically larger for the same torque output.

Which motor types are compatible with planetary reducers?

Planetary reducers are compatible with servo motors, stepper motors, AC induction motors, and brushless DC motors. Flange interfaces (IEC, NEMA, or custom) allow direct mounting without additional couplings.

How do I select the right planetary reducer for my application?

Key parameters include required torque (Nm), speed ratio, input RPM, backlash tolerance, mounting interface, and duty cycle. Always apply a service factor (typically 1.5–2×) to peak load requirements when sizing the unit.

Also You are welcome to watch more projects or visit our video gallery by Youtube: https://www.youtube.com/@tallmanrobotics