M-231 High Resolution Closed-Loop Feedback Servo Motor Linear Actuator

  • 17 mm Travel Range 
  • 0.1 µm / 100 Nanometers Minimum Incremental Motion 
  • Closed-Loop Servo Motor with Feedback Encoder
  • Integrated Hall-Effect Limit Switches 
  • Fits M-105 & F-110 Fiber Alignment Stages

Application examples: Photonics packaging, fiber alignment stages, quality control, test equipment, metrology.

M-231 is an ultra-high resolution closed-loop servo motor linear actuator providing linear motion up to 17 mm with sub-micron resolution in a compact package. It consists of a lead screw driven by a closed-loop DC motor/gearhead combination with motor shaft mounted high resolution encoder (2048 counts/rev).

The M-231 compact closed-loop linear actuator was especially designed to fit compact translation stages (such as the  M-105) and F-110 piezoelectric fiber alignment stages as a direct replacement for a manual micrometer.  See this overview for additional miniature precision linear stages.

M-231 high precision linear actuators provide a cost effective solution for industrial and OEM environments. They feature a low stiction/friction construction allowing for minimum incremental motion of 100 nanometers at speeds up to 2.5 mm/sec.


To protect your investment, M-231 actuators include integrated non contacting Hall-Effect limit switches. Each actuator includes an integral 0.5 m cable with 15 pin D-sub connector and a 3 m extension cable. The connector features integrated line drivers for cable lengths up to 10 meters between actuator and controller.

Cost efficient stepper motor actuators are also available.

For higher loads and travel ranges, refer to the M-227, M-230 and M-235 datasheets.

M-231, Mounted on M-105 XYZ Positioning Systems

PI also makes high speed linear actuators based on linear motors and voice coil motors.


M-231.17 DC-Mike Actuator, 17 mm, Limit Switches

Travel range 17mm 
Design resolution0.007µmA3
Min. incremental motion0.1µmA4
Unidirectional repeatability0.2µm 
Max. velocity2.5mm/sec 
Max. push/pull force40NB2
Max. lateral force0N (at tip) 
Encoder resolution2048counts/rev. 
Drive screw pitch 0.4 mm/rev. 
Gear ratio28,44444:1  
Nominal motor power2W 
Motor voltage range0 to ±12 V 
Limit switchesHall-Effect  
Recommended motor controllersC-842,  

Related Products and Additional Resources

This is a legacy product that may have limited availability or may have been replaced. Ask a PI engineer for an equivalent new model.

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