How to Select the Right Robot Joint Actuator: A Practical Engineering Guide TL;DR: A step-by-step framework for engineers selecting robotic joint actuators — covering torque requirements, transmission type, communication protocol, and control interface. Includes downloadable spec comparison template. The Problem: Too Many Options, Too Little Guidance If you're building a robot arm, cobot, or humanoid and searching for actuators, you've probably noticed: Some suppliers list peak torque, others list continuous torque "Backdrivability" means different things to different manufacturers Communication protocols range from CANopen to EtherCAT to RS485, with no universal standard Price varies by 10x for seemingly similar specs This guide gives you the decision framework I wish someone had given me when I started. Step 1: Define Your Torque Requirements The single most common mistake is using peak torque for sizing. Here's the correct approach: Continuous Torque (T_cont) This is what drives sustained operation.…