Choosing a robot joint actuator is an engineering decision that affects not only torque and motion performance, but also control stability, mechanical integration, and development time. For industrial robots, collaborative robots, humanoid robots, and other robotic systems, the right actuator must match the actual requirements of each joint while remaining compatible with the robot’s motor, encoder, controller, communication network, and power architecture. In this article, I will explain three key criteria engineers should evaluate when selecting a robot joint actuator: torque and gear ratio matching, encoder and communication compatibility, and the manufacturer’s technical documentation and engineering support.

How does Planetary Rotary Actuator work? Discover the step-by-step kinematic principle—sun, planet, and ring gear interaction—that delivers high torque density and precision for machine tools.

The development of planetary actuators is trending toward higher precision, lighter weight, greater ease of use, and enhanced reliability.