Planetary Gearheads provide precise and quiet operation.

Press Release Summary:

Designed to couple to any servo motor via Quick-Connect coupling, HPN Harmonic Planetary® Gearheads feature helical gears that lend to quiet performance and extended life. Peak torque ranges from 9–752 Nm, and one- and two-stage designs respectively offer backlash ratings of <5 and <7 arc-min and reduction ratios of 3:1–10:1 and 13:1-31:1. Suitable for precision motion control and positioning, products come in 11, 14, 20, 32, and 40 frame sizes with reduction ratios from 3:1 to 31:1.

Original Press Release:

New Value Series Planetary Gearheads from Harmonic Drive LLC

HPN Planetary Gears offer affordable pricing with short lead times

Peabody, MA — Harmonic Drive LLC, a leader in high precision motion control introduces the HPN Harmonic Planetary® Gearheads.  HPN planetary gearheads deliver affordable precision.

HPN Planetary gearheads feature a robust design utilizing helical gears for quiet performance and long life. These gearheads are available with short lead times and are designed to couple to any servo motor with our Quick-Connect coupling. This new value series of planetary gears carry the reputation for quality and reliability for which Harmonic Drive® products are known throughout the world. HPN gearheads are suitable for use in a wide range of applications for precision motion control and positioning. HPN Harmonic Planetary® gears are available in 5 frame sizes: 11, 14, 20, 32, and 40, with reduction ratios ranging from 3:1 to 31:1.

HPN Key Features :

Peak Torque 9 N∙m to 752 N∙m

Robust design

High precision

Backlash <5 arc-min (One stage) , < 7 arc-min (Two stage)

Quick-Connect design for easy mounting to a wide variety of servomotors

Reduction ratio 3:1 – 10:1 (One stage), 13:1-31:1 (Two stage) 

Helical gears for quiet performance

Quick delivery

Known for its expert engineering and manufacturing, Harmonic Drive LLC products are relied upon every day throughout the motion control industry. The majority of the products sold by HDLLC are proudly made at their US headquarters and manufacturing facility in Massachusetts.

APPLICATIONS for Harmonic Drive products:

Defense: Unmanned Vehicles, Remote Weapon Stations, Antenna Pointing

Robotics: Industrial, Semiconductor & Flat Panel, Humanoid, Mobile Robots

Medical: Surgical Robots, Medical Imaging, Therapeutic, Prosthetics, Exoskeletons, Lab Automation

Aerospace: Solar Array Drives, Antenna Pointing, Valve Actuators, Lunar and Interplanetary Rovers

Machine Tool: Milling Head, Tool Changer, Rotary Table, Grinding, B & C Axis

Energy: oil exploration, drilling and positioning, wind power, solar

KEY PERFORMANCE features for Harmonic Drive® servo actuators, gearheads and component sets:

True Zero Backlash

Excellent positional accuracy and repeatability

High Torque-to-Weight and Torque-to-Volume ratios

Compact size

High Reliability

Single stage high reduction ratio

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. Affiliated companies in, Japan (Harmonic Drive Systems, Inc.) and Germany (Harmonic Drive AG) provide additional manufacturing capabilities. More information can be found by visiting the company’s web site at


Colleen Anderson

Marketing Manager

Harmonic Drive LLC


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