New frameless motor improves torque density and reduces cogging

The Omni+™ motor series, distributed to the UK by INMOCO, improves thermal management with lower power dissipation and decreased temperature rise. The Omni+™ Series is well suited for medical robotic joints and industrial applications that demand high power density in a compact footprint. 

Pre-engineered in a variety of axial lengths and winding options, the Omni+™ Series is currently available in 60 and 70mm diameters, with additional size options coming soon. 


Large-rotor-inner-diameter to stator-outer-diameter ratios provide thin cross-section form factors, allowing design flexibility for cable routing, optics or other system elements. The frameless motor kits easily integrate with geared robotic joints, direct drive rotary stages or actuators – efficient for compact requirements. 

The Omni+™ 60mm version generates up to 5.29Nm pulse duty and 1.61Nm continuous duty. The 70mm version has a maximum torque of 6.38Nm pulse duty and 1.96 Nm continuous
duty. While increasing power density, smooth motion is delivered, due to reduced cogging – achieved through a high pole count and efficient electromagnetic design with a compact winding arrangement. 

Decreased cogging also reduces torque ripple, resulting in high heat dissipation, a crucial requirement to enable high power generation in a compact design. Celera Motion’s frameless motor kit technology provides high speeds and accelerations, with superior mechanical stiffness that reduces settling times
and increases performance. 

Enabling ease of integration, the Omni+™ is offered in standard diameters and stack lengths that easily match with strain wave gears, and motor windings pair with drive current ratings – making all models compatible with a wide range of drives. Celera Motion’s Everest Series and Capitan Series miniature servo drives can be combined for optimal control, while Celera Motion also provides a range of optical encoders and
inductive encoders for precision feedback – including the Zettlex inductive encoders. 

Custom windings and form factors are also available, and INMOCO can provide application integration support to UK-based design engineers. 

“Advancing on the success of Celera Motion’s Omni series, the Omni+™ frameless motor creates increased torque from a highly compact unit,” says Gerard Bush, INMOCO. “Combined with simple installation and easy cable routing, the Omni+™ is specifically for design engineers that need high power density with smooth motion performance.”