No Cogging with New Low-Profile Rotary Stage from Allient 

Designed with axial flux technology in an ironless motor architecture for zero cogging, Allient has introduced a continuous rotation rotary stage with an ultra-low profile. The ThruSight Theta is engineered for high-precision motion applications across automation, photonics, semiconductor and life science markets. 

The stage features a large 110 mm through-hole aperture and 25 mm overall height. Designed for demanding move-and-settle applications, it provides smooth, repeatable rotary motion while enabling backside accessibility and compact system integration. The Ironless motor design eliminates cogging torque to deliver exceptionally smooth motion and improved positioning accuracy. 

“ThruSight-Theta reflects Allient’s continued focus on developing advanced motion solutions for demanding precision applications,” said Mark Holcomb, Product Line Manager. “Its ironless motor architecture provides smooth, repeatable rotary motion, while its compact design supports precise positioning and efficient system integration.” 

Ironless core motors typically use permanent magnets arranged in a U-shaped channel or parallel opposing tracks to create a strong, focused magnetic field across the air gap where the moving coil resides. Most are neodymium (NdFeB) but also samarium-cobalt (SmCo) and ferrite are used depending on various performance factors sought. They are placed in the rotor or stator to create a steady magnetic flux which interacts with the motor’s windings, producing the torque needed for rotation. 

Based in Buffalo, NY, Allient specializes in motion control products and has about 2,500 staff at multiple locations worldwide. See www.alllient.com