Stepper Motor Linear Actuators / Motorized Lead Screws
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Stepper Motor Linear Actuators Pre-Engineered Motorized Lead Screw Assemblies and Actuators for Precision Applications

Stepper Motor Linear Actuator Assemblies Combining cutting-edge motor, lead screw and encoder technologies Thomson offers three basic configurations – rotating screw (MLS), rotating nut (MLN) and actuator (MLA). The open architecture rotating screw and rotating nut motorized lead screws suit applications where external guidance is present or a high level of design flexibility is required, while the closed assembly of the motorized lead screw actuator is ideal to further simplify the design process and remove requirements for external guidance. Technology Overview Rotating screw assemblies...

Stepper Motor Linear Actuators Motorized Lead Screws Thomson motorized lead screws combine a hybrid stepper motor and a precision lead screw together in one compact envelope. Patented Taper-Lock technology allows quick decoupling and secure, properly aligned connections. This combination offers several advantages over a traditional solution. Improved Efficiency Thomson provides a more efficient motorized solution to reduce power consumption, improve operating battery life, and decrease motor footprint. With this improved efficiency, an increase in system load performance or a reduction in...

Motorized Lead Screw Actuators Thomson motorized lead screws are also available in an actuator configuration (MLA). The actuator is a fully housed solution in which the motion is taken care of for you – simply determine stroke length, linear travel per step or revolution (lead), and precision level to select an appropriate MLA. The actuator configuration offers a complete housing and integrates easily into your assembly with a similar range of end mounting and connection options as the rest of the motorized lead screw family. Built-in Anti-Rotation Our actuator configuration includes...

Stepper Motor Linear Actuators Thomson Advantage The Thomson Taper-Lock Fixing the motor to the lead screw usually requires a coupling assembly (A), a counter-bore press fit (B) or a hollow shaft press fit (C). The assembly process may also entail the use of adhesives or welding, but the bottom line is that all these solutions make it difficult or impossible to change lead screws or perform maintenance. Thomson has solved this issue with our patented Taper-Lock coupling (D) that requires only a single retention fastener. B Coupling assembly • space demanding • requires more external...

Application Examples These common applications show that stepper motor linear actuators reduce the total number of components in your design, while minimizing space requirements, and making assembly and maintenance quicker and easier. Examples are shown for all three configurations - rotating screw (MLS), rotating nut (MLN) and actuator (MLA). Pipetting MLA Tiny, precise, repeatable vertical motion is essential for accurate pipetting. Choose MLA to simplify your z-axis and MLS for precise, horizontal motion in pipetting applications. Fluid Pumps Regardless of the mounting configuration, a...

Stepper Motor Linear Actuators Horizontal Positioning Cameras and other measurement devices need to be in just the right place at just the right time. MLN delivers reliable horizontal positioning and length selections to get your horizontal positioning job done right. Utilizing a stepper motor linear actuator on a 3D printer can eliminate the need for couplings, bearings and supports while increasing stroke length and print volume. Robotic Gripper Monitor Tilting Angle adjustment is made simple when the MLA configuration is applied in monitor and plate tilting applications. MLN...

Ordering Keys MLS/MLN Ordering Key 1. Series MLS = Rotating screw MLN = Rotating nut 2. Motor size1 08 = NEMA 08 motor used through April 2022 (MLS only) X8 = NEMA 08 motor used after April 2022 (MLS only) NEMA 11 NEMA 14 NEMA 17 NEMA 23 3. Motor stack1 A = Single B = Double X = Custom single2 Y = Custom double2 4. Motor current rating (in 0.1 amps)1 05 = 0.5 amps 08 = 0.8 amps 10 = 1.0 amps 13 = 1.3 amps 15 = 1.5 amps 19 = 1.9 amps 30 = 3.0 amps 39 = 3.9 amps 5. Screw diameter3 18 = 0.188 in M04 = 4.0 mm 25 = 0.250 in M06 = 6.0 mm 31 = 0.313 in M08 = 8.0 mm 37 = 0.375 in M10 = 10.0 mm 43 =...

Stepper Motor Linear Actuators MLA = Motorized lead screw actuator 2. Motor size1 08 = NEMA 08 motor used through April 2022 X8 = NEMA 08 motor used after April 2022 11 = NEMA 11 14 = NEMA 14 17 = NEMA 17 23 = NEMA 23 3. Motor stack1 A = Single B = Double X = Custom single2 Y = Custom double2 4. Motor current rating (in 0.1 amps)1 05 = 0.5 amps 08 = 0.8 amps 10 = 1.0 amps 13 = 1.3 amps 15 = 1.5 amps 19 = 1.9 amps 30 = 3.0 amps 39 = 3.9 amps 5. Linear travel/rev (lead in 0.001 inch) 6. Accuracy grade S = Standard 0.010 in/ft (250 pm/300 mm) P = Precision 0.003 in/ft (75 pm/300 mm) 7. Stroke...

Sizing and Selection Guidelines How to Select Motor and Lead Screw For a basic sizing determination, use the motor performance charts throughout the brochure to select the appropriate lead screw based on your load and speed requirements. Example: Required Force = 20 lbf (89 N) Required Speed = 1 in/s (25 mm/s) Linear Speed [in/s (mm/s)] Given the force and speed requirements of 20 lbf and 1 in/s, respectively, the ideal screw is a 250118 or 250125 with this motor. Note: Simplified performance diagrams are theoretical only and assume ideal conditions with a 24 VDC power supply, standard...

Stepper Motor Linear Actuators Sizing and Selection Guidelines How to Determine Maximum Permissible Screw Length For MLS and MLN configurations, in order to determine the maximum possible lead screw length for your stepper motor linear actuator assembly, the following charts can be used. These charts take in to consideration the maximum rotational speed and compression load as well as the end fixity of your system. Critical Speed Motor Speed vs. Maximum Screw Length Column Load Compression Force vs. Maximum Screw Length ML23 MAX LOAD Maximum Compression Load [lbs] Maximum Compression Load...