Simplifying motion integration with motorised lead screws

Written by: Tom Austin-Morgan | Published:

Thomson’s ML series stepper motors with integrated leadscrews are claimed to offer machine builders a flexible linear motion solution that saves space, provides increased load capacity and improved efficiency. Available in the UK from Heason Technology, the motorised leadscrews are available in NEMA size 11, 14, 17 and 23 frame stepper motors with a choice 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.

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. For both shaft options, there is no need for a flexible coupling, saving an average of at least 50mm 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 flexibility for applications from multi-axis positioners to medical pumps and from scanning stages to pick and place robotics. The leadscrews are available in diameters from 4 to 10mm with leads from 1 to 20mm. Standard and precision grade leadscrew versions are said to offer accuracy up to 3µm per 300mm with Acetal or engineered thermoplastic anti-backlash nuts.

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