DM-MA25 Linear Micro Actuator, 25 mm Stroke, 80 N

Overview

The DM-MA25 converts rotary motor motion into precise linear travel through a preloaded ball screw and a crossed-roller guide. The preload removes the axial play that makes a cheap screw drive lose position when the load direction reverses, which is the difference between a 1 µm resolution specification and a 1 µm resolution that holds.

The stepper motor with an integrated 1,000 line encoder gives closed-loop position control, so a missed step is corrected rather than accumulated. Limit switches at both ends protect the mechanism during homing, and the whole assembly is 25 mm wide, which fits inside a gripper body.

Key features

• 25 mm stroke, 80 N continuous force, 200 N peak
• 1 µm resolution with closed-loop encoder feedback
• Preloaded ball screw and crossed-roller guide, no backlash
• Integrated end-of-travel limit switches
• Step/direction, 0-10 V or RS485 control interface
• Anodised aluminium body, 25 mm wide, 420 g

Typical applications

• Gripper jaw adjustment for product changeover
• Fixture and stop positioning
• Probe and sensor fine positioning
• Dosing syringe and valve actuation

Application note

Resolution is not accuracy. Mount the actuator on a flat, stiff surface; a flexing bracket will show up as position error at the tool. If the application needs sub-micron holding, add a piezo fine stage rather than asking a screw drive to do both jobs.