Motor Drivers & Actuation Electronics
Motor drivers and servo electronics are the power-and-control stage that sits between a humanoid robot's central computer and its joint actuators, converting digital torque/position commands into precise phase currents for brushless motors. In humanoid platforms with 20-40+ actuated joints, these drives must be extremely compact, lightweight, and capable of high-bandwidth torque control to enable human-like balance, compliance, and dexterity.
Manufacturers
6 companies
Elmo Motion Control, founded in 1988 and headquartered in Petah Tikva, Israel, designs ultra-compact servo drives and network motion controllers for robotics, semiconductors, aerospace, and life-science automation. Its miniature "Gold Twitter" servo drives were used to control 23 distinct joint axes in the Russian Fedor (Skybot F-850) humanoid robot flown to the ISS. Elmo was fully acquired by Bosch Rexroth in September 2022 but continues to operate as an Israel-based entity.
Synapticon, headquartered in Schönaich, Germany, builds a full motion-control stack for humanoid and legged robots: SOMANET servo drive electronics (Node, Circulo), ACTILINK integrated actuators, and the POSITRON AI-based functional-safety platform. The company markets a dedicated humanoid product line combining EtherCAT-based servo drives, gearmotor actuators, and safety-rated motion control software aimed specifically at humanoid joint integration.
Ingenia Motion Control, founded in Barcelona, Spain, develops high power-density servo drives and motion controllers, including drives compact enough to integrate directly into humanoid wrists and fingers. Ingenia was acquired by Celera Motion, a Novanta Inc. business, in 2019, and its EtherCAT/CANopen servo-drive technology is now marketed under Novanta's Robotics & Automation group alongside "Everest Safe" safety-rated servo drives for humanoid joint control.
Kollmorgen is a long-established US manufacturer of servo motors, drives, and motion controllers for robotics and automation, now part of Regal Rexnord. Its TBM2G frameless servo motor series, introduced in 2022, is designed to be embedded directly into robot joints; robotics company HEBI Robotics used TBM2G motors paired with strain-wave gearing to boost the torque density of its actuator modules used in inspection and legged-robot systems.
maxon, headquartered in Sachseln, Switzerland since its 1961 founding, is a major supplier of brushless DC motors and matched EPOS4 positioning controllers used across robotics, medical devices, and space exploration (including NASA's Mars rovers). maxon's EC-i and EC90 brushless motors paired with EPOS4 controllers power the "HOPE" humanoid robot prototype (developed with The Robot Studio), demonstrated publicly at SPS 2024 in Nuremberg.
ODrive Robotics manufactures high-performance field-oriented-control brushless motor drivers (ODrive Pro, S1, and Micro) widely adopted by robotics builders and startups for legged and humanoid robot actuator control. Its controllers combine motor driver, encoder interface, and closed-loop torque/position/velocity control in a single board, and are a commonly cited off-the-shelf option in open-source legged-robot and humanoid actuator projects, including being evaluated as an actuator-driver option in the Berkeley Humanoid Lite open-source humanoid project.