Ac servo actuator boosts torque density

HARMONIC DRIVE SHA brushless servo-actuator provides high torque density and improved positional accuracy, as better than 1 arc-min and ±5 arc-sec repeatability is achieved while delivering up to 30,000 in-lb of torque. A robust cross-roller bearing allows mounting of large loads directly to the actuator without additional support. Device provides a compact, hollow shaft configuration that allows design versatility for demanding applications.

http://www.electromate.com