MPS50GR and MPS75GR Miniature Gear-Driven Rotary Stage


Design Features

  • Low profile and compact with aperture
  • Precision worm-gear drive
  • DC servo or stepper motor
  • Continuous 360 degree rotary positioning
  • Graduated tabletop
  • High vacuum capable
  • Optional lens mount adapter
  • Compact multi-axis configurations with linear and other MPS series stages

The MPS50GR and MPS75GR rotary stages provide accurate positioning performance in a low profile and compact footprint. They are perfect for the confines and requirements of the laboratory and are also applicable for use in manufacturing environments. MPS-GR stages are ideal for optics, measurement, alignment and other demanding applications.

MPS-GR TabletopConstruction Features

The MPS-GR stages incorporate a precision worm-gear drive mechanism and bearing components for highly accurate positioning performance over the lifetime of the product. They are available with DC servo or stepper motors.  The DC servomotors for both stages are equipped with a square-wave rotary encoder. The MPS50GR has a 20 mm aperture and the MPS75GR has a 30 mm aperture. The MPS75GR includes a manual adjustment knob.

Vacuum and Mounting Options

Both stages are available with optional vacuum preparation to 10-6 torr including a vacuum-rated connector. An optional breadboard mounting plate provides direct mounting to both English and metric breadboards. Also available is an aperture Lens Mount Option (LMO) for easy mounting of standard lenses over the stage aperture.

The MPS50GR and MPS75GR are members of the MPS (Miniature Positioning Stage) family of linear, rotary, goniometer and vertical lift stages. Two or more stages can easily be mounted together in numerous combinations using standardized mounting patterns with adapter plates and brackets.


Mechanical Specifications

Travel 360° Continuous
Accuracy Uncalibrated 250 arc sec 200 arc sec
Calibrated 80 arc sec
Resolution (Minimum Incremental Motion) DC Servomotor (-M1) 2 arc sec 1 arc sec
Stepper Motor (-M2) 2 arc sec 1 arc sec
Repeatability (Unidirectional)(1) DC Servomotor (-M1) 8 arc sec 6 arc sec
Stepper Motor (-M2) 20 arc sec 10 arc sec
Tilt Error Motion 40 arc sec
Worm Gear Ratio 80:1 100:1
Maximum Speed DC Servomotor (-M1) 23 deg/s 180 deg/s
Stepper Motor (-M2) 4.5 deg/s 100 deg/s
Aperture 20 mm 30 mm
Maximum Torque (Continuous) 0.4 N·m 0.6 N·m
Load Capacity(2) Axial 4 kg 12 kg
Radial 1 kg 5 kg
Moment 0.25 N·m 1.5 N·m
Rotor Inertia (Unloaded) 0.000031 kg·m2 0.000141 kg·m2
Stage Mass 0.8 kg 1.7 kg
Material Anodized Aluminum Body
  1. With Aerotech controllers.
  2. Payload specifications are single-axis system.
  3. Excessive duty cycle may impact stage accuracy.
  4. Specifications are for single-axis systems measured 25 mm above the tabletop. Performance of multi-axis systems is payload and workpoint dependent. Consult factory for multi-axis or non-standard applications.

Electrical Specifications

DC Servomotor (-M1)
Stepper Motor (-M2)
DC Servomotor (-M1)
Stepper Motor (-M2)
Drive System DC Brush Servomotor with 14:1 Gearbox 24 VDC Bipolar Stepper Motor with 43:1 Gearbox DC Brush Servomotor 24 VDC Bipolar Stepper Motor
Feedback 512 lines/rev Rotary Encoder N/A 10,000 lines/rev Rotary Encoder N/A
Electronic Resolution 0.565 arc sec (0.000157°) 0.785 arc sec (0.000218°) @ 480 steps/rev motor resolution 0.324 arc sec (0.00009°) 0.324 arc sec (0.00009°) @ 40000 steps/rev motor resolution
Maximum Bus Voltage 48 VDC 48 VDC* 48 VDC 48 VDC*
Home Marker Optical Switch
    *With Aerotech control system.

Recommended Controller

DC Servomotor (-M1)
Stepper Motor (-M2)
DC Servomotor (-M1)
Stepper Motor (-M2)
Multi-Axis A3200 Npaq/Npaq MR/Ndrive MP
Ensemble Ensemble LAB/Epaq/Epaq MR/Ensemble MP
Single Axis Soloist Soloist MP
  • MPS-GR Load and Torque Graphs


Ordering Information

MPS-GR Series Miniature Gear-Driven Rotary Stage

MPS50GR MPS50GR miniature gear-driven rotary stage with 20 mm aperture
MPS75GR MPS75GR miniature gear-driven rotary stage with 30 mm aperture

Vacuum Preparation (Optional)

-HV High vacuum preparation to 10^-6 torr

Motor (Required)

-M1 DC servomotor
-M2 Stepper motor

Mounting Plate (Optional)

-MP Optical table mounting plate

Lens Mount (Optional)

-LMO Aperture lens mount

Metrology (Required)

-PL0 No metrology performance plots
-PL1 Metrology, uncalibrated with performance plots
-PL2 Metrology, calibrated (HALAR) with performance plots

Integration (Required)

Aerotech offers both standard and custom integration services to help you get your system fully operational as quickly as possible. The following standard integration options are available for this system. Please consult Aerotech if you are unsure what level of integration is required, or if you desire custom integration support with your system.

-TAS Integration - Test as system
Testing, integration, and documentation of a group of components as a complete system that will be used together (ex: drive, controller, and stage). This includes parameter file generation, system tuning, and documentation of the system configuration.
-TAC Integration - Test as components
Testing and integration of individual items as discrete components that ship together. This is typically used for spare parts, replacement parts, or items that will not be used together. These components may or may not be part of a larger system.