Stepper Motor Linear Actuators Pre-Engineered Motorized Lead Screw Assemblies for Precision Applications www.thomsonlinear.com A REGAL REXNORD BRAND

Stepper Motor Linear Actuator Assemblies Combining cutting-edge motor, lead screw and encoder technologies Thomson offers two basic configurations – rotating screw (MLS) and rotating nut (MLN). These open architecture motorized lead screws suit applications where external guidance is present or a high level of design flexibility is required. Technology Overview Rotating screw assemblies (MLS) actuate by having the motor rotate a lead screw and translate a load that is attached to the lead nut. Rotating nut assemblies (MLN) actuate by rotating a nut within the motor body. Motion is achieved by...

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 power...

Thomson AdvantageThe 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. Coupling assembly • space demanding • requires more external components • reduced stroke Counter-bore press...

Stepper Motor Linear Actuators Ordering Keys MLS/MLN Ordering Key 1. Series MLS = Rotating screw MLN = Rotating nut B = Double X = Custom single2 Y = Custom double2 7. Accuracy grade S = Standard 0.010 in/ft (250 pm/300 mm) 8. Lead screw overall length1,2 0X000 = X.000 in (ex: 06000 = 6.000 in) XXX00 = XXX.00 mm (when metric diameter is selected, ex: 15000 = 150.00 mm) N = No coating on lead screw T = PTFE-coated lead screw4 1. For available standard motors, see pages 14-28. 2. To be assigned by Thomson only. 3. For compatible lead screws, see pages 10-11. 4. PTFE coating not available for MLN...

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 both configurations - rotating screw (MLS) and rotating nut (MLN). Fluid Pumps Regardless of the mounting configuration, a stepper motor linear actuator can increase pump pressure, reduce equipment footprint and more accurately dispense fluid. Stepper motor linear actuators optimize XY stage designs with their compactness and power.

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 MLN configurations excel in gripping applications, rotating and positioning gripper heads and attachments with ease.

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. 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 material lead nut and a moderate length, non-lubricated lead screw. Higher loads and speeds can be achieved....

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 [N]...

Lead Screw Sizes Inch Lead Screws S = Rotating Screw (MLS), N = Rotating Nut (MLN) Motor MLSX8 Linear Travel / Full Step [µ in.] Lead Designator Diameter Designator [hundredths of in. diameter] 18 1. Some leads may not be available in high-performance nut material or some anti-backlash nuts. Contact Thomson for more detail. 2. Fine-pitched lead screws may have substantially lower load capacities compared to traditional lead screws. 3. Lead screw not available in precision grade accuracy (P). 4. Hybrid threadform consisting of diameter in [in] and lead in [mm] (example: 0.25 in x 2 mm). Note:...

Metric Lead Screws S = Rotating Screw (MLS), N = Rotating Nut (MLN) Linear Travel / Full Step [pm] Note: Not all available lead screws are shown above. Please contact Thomson for more details. 1. Some leads may not be available in high-performance nut material or some anti-backlash nuts. Contact Thomson for more detail. 2. Lead screw not available in precision grade accuracy (P).

1. Contact Thomson for optional lead screw coatings. 2. Depending on lead, nut material and lubrication. 3. Depends on nut, load and orientation. 4. For best positional repeatability, load should be kept well below design load of nut. 5. Max. axial load based on a L10 life of 10000 hours of continuous motion at speeds of 100 to 300 RPM. 6. Can be adjusted based on application requirements. If axial load exceeds pre-load of motor, motor shaft may deflect up to 0.003 in. (0.08 mm) for configurations with axial load pulling away from motor face. 7. Nut fit can be adjusted depending on backlash requirements....