The WAM® Arm

The WAM® Arm is a highly dexterous, naturally backdrivable manipulator. The only arm sold in the world with direct-drive capability supported by Transparent Dynamics™ between the motors and joints, so its control of contact forces is robust—independent of mechanical force or torque sensors. It is built to outperform conventional robots with unmatched human-like grace and dexterity.


The WAM® Arm is available in two main configurations, 4-degree-of-freedom and 7-degree-of-freedom, both with human-like kinematics. The joint ranges exceed those for conventional robotic arms.

Higher Performance than Conventional Manipulators

Matching advanced electronics with inherently backdrivable cable drives results in superbly graceful motions. Barrett owns the technology for the highest performance servo-electronics available in the world today. These electronics are also the smallest (43 grams) and most power-efficient servo-drive electronics available today.

Features & Benefits

270-degree average joint mobility
Enhances dexterity and agility even beyond human capability

Zero-backlash and near-zero friction
Extraordinarily graceful motion

Modular construction
Interchangeable components

Brushless rare-earth
High torque, low mass, lower rotor inertia, servo motors and vacuum compatibility

Open control architecture
Excellent research tool: direct access to sinusoidally commutated current amplifiers for developing advanced control algorithm

Lightweight design
Reduces moving inertia for faster cycle times

Compact, small footprint
Efficient use of space; adaptable to mobile platforms

Long and slender links
Reaches in and around obstacles with ease

Extends force control along entire surfaces of joints throughout links

Kinematic redundancy
Unusually high dexterity in either 4 or 7 degree-of-freedom configurations

Human-like kinematics
Arm links form grasps around large objects (~1 m)

System Components


1 - Modular Outer Link
2 - Barrett Arm
3 - Ethernet Cable
4 - DC Power Cable
5 - Power Supply with Line Cord
6 - Pendants
7 - Maintenance Kit


Each of Barrett Technology's components comes with a standard 1-year warranty. 12-month Extended Warranty packages can be purchased for approximately 5% of the component's list price. Warranty subscription services include free software and firmware upgrades, component maintenance. 

Barrett's support engineers are available to provide application support, instruction, training, and answers to any questions via email, fax, or phone. Additionally, customers receive access codes to download the most up-to-date versions of our software packages. Barrett maintains its software and manuals online and even provides source code for customers who wish to develop software for different platforms, or to modify the code.