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Rotary Micro Stages

M3-RS Rotary Smart Stage
Angular Micro positioning module with embedded controller

Smallest size, high resolution, unmatched ease of use

This miniature, “all-in-one” rotary positioning stage has closed-loop position resolution better than 0.022 degrees with absolute position feedback. it provides point-to-point angular positioning with closed-loop bandwidth of ~100Hz.

All drive electronics, embedded firmware, patented piezoelectric motors, position sensors and bearings are integrated into a module less than 12 x 22 x 16 mm. With no need for an external controller, this smart stage enables smallest system size in hand-held and portable instruments.

The embedded controller also means rapid and easy integration into your system. It accepts direct input of high-level digital motion commands from your system processor over UART, SPI, I2C or analog servo interface. It needs only 3.3 V DC and can be powered by USB or standard batteries.

m3-rs-u2 rotary microstage shown with mirror mounted on shaft next to a quarter


M3-RS-U2 Rotary Stage – This piezoelectric stage provides continuous 360° rotation with absolute position feedback. Contact us for guidance on mounting a payload to the rotating shaft for your OEM application.


  • Smallest size: 11.75 x 21.9 x 16 mm including controller
  • Closed-loop controller embedded in micro stage
    • No separate electronics needed
    • 3.3 VDC input
    • Direct input of motion commands (I2C, SPI, UART or analog servo)
  • Angular resolution ~ 0.022 deg closed loop
  • Absolute encoding and position feedback
  • Millisecond step and settle times
  • Point-to-point angular positioning with closed-loop bandwidth ~100Hz
  • Holds position with zero power and no jitter
  • Fast integration for embedded motion in smaller instruments

M3-RS-U2 Rotary Stage shown with mirror (not included) mounted on rotating shaft for point-to-point beam steering. Contact us for guidance on payload mounting and/or custom clamps for OEM applications.


Scientific and industrial instruments requiring precise rotational positioning in a limited space, including:


  • Next-gen sequencing (NGS)
  • Dermatology lasers
  • Fluorescence microscopes
  • 3D imaging instruments
  • In-vivo and in-vitro micro laser surgery


  • Free-space optical communication
  • Variable optical attenuation
  • Fiber-to-fiber optical switching


  • Quantum Computing
  • 3D printers
  • LIDAR, 3D measurement, spectroscopy
  • Remote sensing (e.g. pollution)
  • Laser marking and machining

Aerospace and Defense

  • Target designation, jitter compensation
  • Automated obstacle detection, tracking and avoidance for robots, UAVs, etc.

Application Example and Developer’s Kit: Two-axis, two-mirror beam steering system.

Developer’s Kits

the M3-RS-U2 Dev Kit contents: a black case, a USB cable, flex cables, a screw driver, a break-out board, a USB adapter, a thumb drive with software, and a rotary stage


Developer’s Kit: Rotary Microstage

  • One M3-RS-U2-4.5-360 Rotary Smart Stage with embedded controller
  • Straight FPC
  • Breakout board for evaluation and development
  • USB adapter and extension cable
  • New Scale Pathway™ Software
  • Screwdriver and mounting screws
two-axis two-mirror beam steering microsystem


Developer’s Kit: Two-Axis Two-Mirror Beam Steering System

  • Two M3-RS-U2-4.5-360 Rotary Smart Stages with embedded controller and straight FPC
  • One M3-RS-U-Mirror-01-03, mounted to stage
  • One M3-RS-U-Mirror-01-11, mounted to stage
  • One 650nm collimated laser
  • Base
  • Demo board and cables for evaluation and PC connection
  • Power supply
  • New Scale Pathway™ Software
a rotary microstage shown with the new scale pathway software window open and a script running

All Developer’s Kits include New Scale Pathway™ software, a powerful development tool that lets you easily evaluate the micro stages and validate your embedded software.


M3-RS-U2-4.5-360 Rotary Smart Stage | Download Data Sheet (PDF)

Attribute Value
Range of motion 360 degree continuous rotation
Speed >1100 deg/sec
Acceleration* >1,000,000 deg/sec²
Stall torque (min) 0.04 N-mm
Holding torque (min) 0.08 N-mm (zero power)
Recommended maximum payload mounted to rotating shaft (payload must be balanced)  
Mass 3 g
Inertia 350 g-mm²
CLOSED-LOOP performance (with built-in position sensor)  
   Recommended step frequency up to 100 Hz
   Resolution (absolute encoder resolution) 0.022 deg absolute
   Repeatability +/- 0.05 deg (880 µrad)
   Accuracy 0.25 deg (4400 µrad)
   Closed loop step & settle times (typical)* 0.5 deg step: 16 ms
5 deg step: 22 ms
20 deg step: 31 ms
OPEN-LOOP performance (external position sensor provided by user – see
application note
   Open loop step & settle times (typical)* 0.05 deg step: 0.5 ms
0.5 deg step: 1.2 ms
5 deg step: 5 ms
20 deg step: 11.2 ms
Input voltage 3.3 VDC +/-6%
Power consumption (typical) 750 mW active, moving
190 mW active, ready
150 mW standby
Stage mass 4.7 g
Operational lifetime >2 million random positions or seven years, whichever occurs first
Temperature and relative humidity 0 to +60 °C, non-condensing
Conformance RoHS; CE pending
Controller Integrated into stage, 64 MIPS
no external controller needed
Communication interface: I²C, SPI, or UART
Input directly to M3-RS

*With 0.6 g-mm2 inertial load mounted to output shaft, based on a target tolerance of 2 encoder counts


Download CAD files, New Scale Pathway software and programming guides (registration required)

Learn More

The M3 Smart Module Platform

M3 Smart Modules integrate a piezoelectric SQUIGGLE® micro motor, precision mechanical guide system, position sensor, microprocessor, and drive electronics into one tiny package. Eliminating the need for external controllers, they offer the smallest system size and easiest integration into OEM systems.

Learn more about the M3 Platform

Custom Engineering

We use our configurable M3 Smart Module platform to develop custom motion modules and systems that meet your exact requirements. We also develop full-custom micro motion systems. Ask us about a motion system feasibility study, the first step to faster, lower-risk product development.

Learn more about custom motion engineering services