With the speed of servo-hydraulics and the low maintenance and footprint of a screw-driven frame, Psylotech's servo-rotational technology offer precision, flexibility and convenience. Servo-hydraulics are a traditional choice for dynamic mechanical analyzers. However, physics works against hydraulics in dynamic applications: the oil is essentially a dampener and the faster it moves, the more it fights itself.

Electrodynamic (ED) systems offer a high rate alternative. They are quiet and they offer the footprint and low-maintenance of a screw-driven testing machine. Yet electrical current is directly proportional to force. Since current also generates heat in the windings, commercial ED systems are limited in their peak load, making servo-hydraulics the only alternative beyond about 10,000 N.

Psylotech's servo-rotational ED actuator scales to 100,000 N and beyond, circumventing the heating problem by introducing a moment arm. The actuators are effectively a toothless rack and pinion, acting similar to a steel wheel rolling on a railroad track. A novel mechanism applies normal force to convert rotational load to linear motion through static friction. Maintenance is low, because unlike screw driven frames, the roller interface requires no lubrication. Moreover, the actuators take advantage of 25 bit rotary encoders, leading to superior motion control.