Linear Stepping Motors

COBRA linear stepping motor with Star2000 drive

The linear stepper motor from ACP&D Limited represents a major advance in robotics. Gone are the requirements for linear or roller bearings, belts and lead screws for this linear stepping motor is actually built into a carriage which 'floats' on a bed of air. 
The carriage contains both the magnets and the coil windings of the stepping motor and the beam (or stator as we call it) is just a length of steel or stainless steel with a series of grooves cut into it's surface. A tough polymer resin is used to fill the groves so that the stator is perfectly smooth. A pneumatic connection to the carriage operating at 3 to 5 bar ensures that the carriage 'floats' as it moves along the stator.

COBRA linear stepping motor (642 carriage, single axis)

The linear stepping motor provides the user high dynamics (up to 3m/s) coupled with smooth movement due to micro-stepping. It is able to move large loads up to 1,600N with high accuracy (±0.05mm) and repeatability. As there are no belts or lead screws there is only the friction of the cables and the inertia of the carriage to overcome. There are presently ten different sizes of linear stepping motor available starting with the type: 301 (20N load) up to the type: 1802 (1,600N load). The steel or stainless steel stator can be supplied in various sizes up to 6,500mm with the type: 1802. Dependant upon the length of stator supplied it is possible to have more than one carriage on the same stator. In this case the carriages can either be driven together as if they were physically connected to each other or be driven independently. For more information please telephone us on +44(0)161 343 1884 or e-mail us at

COBRA X-Y 2-axes linear stepping motor

The COBRA: X-Y linear stepper motor system is based on a hybrid stepping motor design which offers one of the few possibilities of realizing linear movement with high speed and accelerating power coupled with very good positioning accuracy. Each carriage (which are bolted together) incorporates the windings and magnets of a stepping motor enabling movement in both the X and Y directions to be realized. The carriage ‘floats' a mere 50µm off the surface of the stator on an ‘air bearing'. In order to counteract the effect of cantilevered forces the COBRA: X-Y has specially widened stators enabling these forces to be dissipated across the an air bearing of greater area than that of the single axis COBRA.

Without the requirement of additional measuring systems a micro step operation of high resolution can be obtained with the COBRA: X-Y. When used in conjunction with the PS6410 stepping motor drives an accuracy of <5µm can be attained. 
Due to the integrated air system absolute wear is greatly reduced and as a consequence of this downtime for regular maintenance is a thing of the past. 
Another great advantage of the COBRA: X-Y is the compact design of the unit making it ideal where space is an optimum. The COBRA: X-Y is available in various stator sizes enabling working strokes. The type: ‘A' carriage has a 90N permissible static force and the type: ‘B' carriage has a 145N permissible static force. The permissible maximum load is 400N.

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Linear Stepping Motors