The URS family of rotation stages provides 360° continuous motion in a low profile package and is suitable for research and industrial applications needing precision performance at an affordable cost. Stepper motors are a lower cost alternative to DC servo systems for less demanding applications. The URS stepper motor stages feature micro-stepping to improve resolution and smoothness of motion, with a minimum incremental motion size smaller than that of their DC motor driven equivalents. Run open-loop, pulse count is a good indicator of position.
Economical, general purpose
Flexible preloading system guarantees backlash-free operation
Tilted worm screw arrangement and 4 symmetric mounting holes provide better support for cantilevered loads with a smaller footprint
URS50 and URS75 also available in a vacuum compatible version -PPV6.
Maximum speed is reduced to 20°/s for URS75BPPV6 and 4°/s for URS50BPPV6.
Uni-directional repeatability for URS50BPPV6 is ±2 mdeg.
Features
Tilted Worm Screw
The tilted worm screw arrangement allows for 4 symmetric mounting holes as compared to other designs that only feature 2 or 3 mounting holes. This enables the URS-B stages to provide better support of higher or off-centered loads. Additionally, the flexible preloading system for the worm gear was improved to minimize backlash during operation.
URS50CPP Top View
Economical Micro-stepping Stepper Motor
The stepper motor version is a more economical version for less demanding applications. When used with motion controllers with high micro-step capability, like the XPS or ESP30x, low noise operation and very small incremental motions are guaranteed. The stepper motor versions do not use encoder feedback, but reach a position by the number of commanded steps and microsteps. For this purpose, the stepper motor is directly attached to the worm screw using a proprietary bellows coupling that has a high torsional stiffness, eliminating the need for a gear or belt drive. The high output torque of the stepper motor minimizes the risk of lost steps and provides good linearity between commanded microsteps and the actual motion of the stage.
Basic working operation of a micro-stepping stepper motor
Vacuum Compatible Versions
The URS50BPPV6 and URS75BPPV6 are vacuum compatible versions of the URS series stepper motor stage. They can be used in vacuum environment down to 10-6 hPa.
Proprietary Ball Bearings
All URS-B rotation stages feature a proprietary ball bearing to provide a low-profile compact stage with exceptional stiffness, high reliability and low wobble and eccentricity.
Limit Switches
Except for the URS50 version, all URS stages feature adjustable limit switches to prevent over travel.
Metrology Report Included at No Additional Cost
Newport guarantees specification values which are measured and recorded following ASME B5.57 and ISO 230-2 standards. The typical performance values are two times better than the guaranteed specifications.
URS Stage Load Characteristics
URS Vacuum Compatible Stage Load Characteristics
Compatible motion controllers for these stepper motor driven stages are:
* Minimum incremental motion of URS50CPP is 1.125 mdeg with SMC100PP controller.
Minimum incremental motion of URS-BPP is 1.0 mdeg with SMC100PP controllers.
Speed of URS-CPP and URS-BPPV6 will be reduced to 40% of specified speed in datasheet with SMC controller.
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