Selection of Planetary Gear Reducer Motor

1. Overview of Planetary Gear Motor

Planetary Gear Motor is a precision transmission device that integrates a planetary gear reducer and a motor. With its advantages of high torque density, low backlash, and compact structure, it has become a core power component in the fields of industrial automation, robotics, and medical equipment. Its core design is inspired by the movement of planets in the solar system, and it achieves power transmission and speed regulation through multi-stage gear meshing.

2. Structure and working principle

Core components

Sun gear: central gear, directly connected to the motor shaft, input power.

Planet gears: multiple small gears rotating around the sun gear, fixed by the carrier.

Ring gear: an annular gear with a fixed or rotating outer ring, meshing with the planet gear.

Transmission process

Power input: the motor drives the sun gear to rotate.

Power distribution: the sun gear drives the planet gear to rotate around its own axis and revolve around the sun gear at the same time.

Output mode:

Planet carrier output: deceleration mode (common in low-speed and high-torque scenarios).

Ring gear output: speed-up mode (less commonly used).

3. Core advantages of planetary reducers

1. High torque density Multiple gears share the load, and the torque output is increased by 3-5 times

2. Low backlash (≤5 arc minutes) Symmetrical gear meshing offsets the gap, and the repeat positioning accuracy reaches ±0.01mm

3. Compact structure Coaxial input and output, saving installation space (flange adaptation 50-150mm)

4. High transmission efficiency (≥90%) Low gear rolling friction loss, suitable for continuous operation

5. Modular design Supports multi-stage series connection, flange customization, and flexible adaptation to different motors