The U-628 from Physik Instrumente features an integrated optical encoder for direct metrology. It has an unlimited rotation range, a reference point switch and a central clear aperture with 7 mm diameter.
Oscillating piezoceramic actuators act directly on the ring-shaped runner. It also has a high velocity and a holding torque of 0.1 Nm.
The key features of the U-628 are:
Side length 50 mm
Integrated position encoder
High velocity >1000°/s
Unlimited rotation rang
The applications include sample handling and positioning in research and industry for installations limited in space with the vacuum version being optional