Robot joints commonly use reducers to match the joint's power, precision, and stability needs. They solve the mismatch between the servo motor's native performance and what the joint actually requires.
Torque and speed matching
Servo motors in industrial and collaborative robots usually run at high speed and low torque. A joint needs low speed and high torque to drive a load, such as lifting a heavy object or completing precision assembly. A reducer uses its gear ratio to lower motor speed into the joint's low-speed range and increase output torque.
Better positioning accuracy
RV reducers and harmonic reducers used in robot joints have very small backlash. They offset transmission error from the motor and help maintain repeat positioning accuracy. Industrial arms can reach ±0.02 mm repeat positioning accuracy. High-precision reducers are one of the key parts for reaching this level, which matters in medical surgical robots and precision electronics assembly.
Stable and safe operation
A reducer buffers impact from the load. It keeps the motor from taking overload or sudden load shocks directly, protecting the motor and joint structure. It also adjusts inertia matching and reduces inertia fluctuation during joint motion. This makes trajectory motion smoother and avoids vibration or loss of control.
Simpler control
The reducer handles speed and torque conversion before motion reaches the joint. The robot control system then does not need extremely complex speed control algorithms for a high-speed motor. This simplifies the control process and improves system reliability.
Note
A reducer is a precision transmission part. Taking it apart without authorization or doing improper maintenance can cause loss of accuracy or part damage. Daily maintenance must follow the manufacturer's technical specifications.
For robot joint and reducer manufacturers, Hansheng Automation machines reducer housings, mounting flanges, shafts, and other precision parts from customer drawings. Single-piece and small-batch orders are supported.
