New compact linear actuator

Jon Lawson

New from Mclennan, NEMA size 11 StepServo integrated motors are now available as compact all-in-one linear actuators fitted with precision ballscrew or leadscrew output shafts and anti-backlash nuts. As a convenient and cost effective drop-in solution the new TBSM11 linear actuator includes the positioning mechanics, servo drive, motor, feedback and motion controls that are required for a variety of high precision linear positioning and force/tensioning tasks.

AMP´s StepServo extends closed-loop servo performance to traditional stepper motor-based motion systems with integrated motor packages that
include microstepping motors with built-in drives, encoder feedback, motion controllers and optional fieldbus communications. Highly developed servo control algorithms provide up to 50% more torque than normal steppers with significant benefits including higher precision control,
higher acceleration, faster machine cycles and greater productivity aswell improved energy efficiency and quieter operation.

For the current TBSM11 series AMP has used its miniature NEMA size 11 motor which has a nominal torque around 8Ncm that provides around 100N of usable force for the actuator (based on a 5mm pitch ballscrew). With screw pitches from 1mm to 5mm/rev and repeatability to ±0.02mm users can choose ballscrew or lead screw solutions with diameters up to 6mm.

Mclennan´s sales and engineering team are able to specify the optimal screw and mating nut solution with stroke length, end machining and nut
preloading designs. From a mechanical installation perspective, the TBSM11 reduces design effort, saves space and removes the need for
couplings - whilst directly offering a typical closed-loop positioning resolution to 0.005mm per motor step. The use of an integrated motor
solution also means less wring and an easier more compact installation. 

The TBSM features on-board motion control with AMP´s Q Programming software which allows operation as a stand-alone axis with motion
profiles stored in a non-volatile memory. Software supported set-up, configuration, programming and firmware management is via an RS-485
communication port that also enables network connections for multiple axes.