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Mini Brushless Servo Actuator

Harmonic Drive LLC

The RSF Supermini Series is an ultra-miniature brushless servo actuator that delivers high torque and precision by combining a zero-backlash Harmonic Drive® gearhead with a high performance servo motor. The output shaft is supported by a robust 4-point contact bearing which often allows mounting of the load directly to the shaft of the actuator. Performance matched servo drives are also available to deliver the full capabilities of these high performance actuators. 

The units are extremely customizable and small enough to fit inside the finger of a robotic hand.

Key Features

  • Compact, Lightweight
  • High Output Torque
  • High Accuracy
  • High flex Encoder Cable
  • Optional Brake (available for RSF-5B)


  • Indirect drive for Humanoid Robots
  • Liquid crystal manufacturing equipment
  • Semiconductor manufacturing systems
  • Automation equipment
  • Electronic component assembly systems
  • Measurement and test systems

About Harmonic Drive LLC
Harmonic Drive LLC engineers and manufactures precision Harmonic Drive® servo actuators, gearheads and gear component sets.  They work with industry-leading customers and companies of all sizes to provide both standard product and custom-engineered servo actuators, gearheads and gear components. Harmonic Drive LLC provides high precision, high performance solutions to meet customer’s mission critical application requirements. The majority of the products sold by HDLLC are proudly made at their US headquarters and manufacturing facility in Massachusetts. Harmonic Drive LLC is AS9100 and ISO 9001 registered. Affiliated companies in, Japan (Harmonic Drive Systems, Inc.) and Germany (Harmonic Drive SE) provide additional manufacturing capabilities. 

With over 50 years of experience, our expert engineering and production teams develop enabling technologies and products to meet the needs of an evolving motion control market. We are very proud of our outstanding company history. Our high-precision, zero-backlash Harmonic Drive® gears and Harmonic Planetary® gears have, and continue to play critical roles in robotics, spaceflight applications, semiconductor manufacturing equipment, factory automation equipment, medical diagnostics and surgical robotics. More information can be found by visiting the company’s website at www.harmonicdrive.net
Harmonic Drive is a registered trademark of Harmonic Drive Systems.


Model: RSF Supermini Actuator



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