Simplifying motion integration

Louise Davis

Thomson’s new ML series stepper motors with integrated leadscrews offer machine builders a flexible linear motion solution that saves space, provides increased load capacity and improved efficiency. 

Available in the UK from Thomson’s authorised distributor, Heason Technology, the motorised leadscrews are available in NEMA size 11, 14, 17 and 23 frame stepper motors with a choice of novel and patent pending rotating screw or rotating nut styles.

The rotating screw option features a taper-lock shaft to precision align and fix the leadscrew into the hollow motor shaft, with a separately supplied nut assembly that attaches to and translates linear motion to the load. This option also facilitates quick removal and replacement for maintenance. The rotating nut design integrates the nut inside the hollow motor shaft, allowing the leadscrew to traverse both ends of the motor. This option takes advantage of a maximised screw diameter which increases load capacity.

The leadscrew can be arranged to push or pull the load; alternately either or both shaft ends could be supported and the motor fixed directly to the moving platen in a positioning stage set-up.  For both shaft options, there is no need for a flexible coupling, saving an average of at least 50 mm in installed size compared to standard positioning stage designs - and with fewer components a lower TCO is also achievable.

This ML series’ diverse choice of stepper motor sizes, leadscrew pitches and working lengths allows wide flexibility for applications from multi-axis positioners to medical pumps and from scanning stages to pick and place robotics. Through the range, 303 stainless steel machined leadscrews are available in diameters from 4mm to 10mm with leads from 1 mm to 20 mm. Leadscrew length is determined by maximum motor speeds ansd application requirements.  Standard and precision grade leadscrew versions offer accuracy up to 3 microns per 300mm with Acetal (standard grade) or engineered thermoplastic anti-backlash nuts. Other standard options include machined ends. Special leadscrew pitches, lengths and end details are available on request.

Throughout the range Thomson’s high torque density stepper motors guarantee elevated performance with force/linear speed characteristics that will yield high efficiency and high precision results.

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