Rotating stages turn up power and accuracy
A
Newport Spectra-Physics product story
Edited by the Engineeringtalk editorial team
Jul 23, 2004
The URS series of high-precision rotation stages replaces the popular M-URM series.
The URS series of high-precision rotation stages replaces the popular M-URM series.
Boasting rotation speeds four times faster and better motion performance specifications than the outgoing M-URM series stages, the new URS stages feature an enhanced, lower-profile package providing easier top-down mounting that is directly compatible with Newport VP (URS75), ILS (URS100) and IMS (URS100 and URS150) series of linear stages.
The URS rotation stages are available with two different types of motors.
The DC motor version features an ultra-high-resolution 8000 count/rev rotary encoder with index pulse for precision homing.
It is the recommended choice for applications requiring accurate bidirectional positioning.
For the tightest position control, the rotary encoder is directly mounted on the worm screw.
This eliminates most of the possible error sources that may appear with indirect position readout.
The high torque DC motor provides the highest dynamic speed range and allows for rotating speeds up to 80 deg/s.
The stepper motor version is an economical choice for less demanding applications.
It guarantees low noise and very small incremental motions when used with our XPS or ESP100/300 motion controllers with high micro-step capability.
This version does not use encoder feedback.
Instead, it calculates position by the number of commanded steps and microsteps.
For this purpose, the stepper motor is directly attached to the worm screw with a proprietary bellow coupling with high torsion stiffness and no gear or belt drive in between.
Furthermore, the high output torque of the stepper motor minimizes the risk of lost steps and provides good linearity between commanded micro-steps and the actual motion of the stage.
All URS rotation stages feature a proprietary four-contact-point ball bearing.
The unique, two-piece design of the URS provides a low-profile compact stage with exceptional stiffness, high reliability and outstanding wobble and eccentricity.
Compared to other designs that feature two or three mounting holes for the tilted worm, the URS stages allows for four symmetric mounting holes and provide better stiffness for enhanced support of higher or off-centred loads.
Additionally, the flexible preloading system for the worm gear has been improved to guarantee a backlash-free operation with an MTBF of 20kh.
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Contact Newport Spectra-Physics
Tel +33 1 60 91 68 68
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