Dual-Axis Linear Stepper (Sawyer) Motors

Abstract

Linear stepping motors are an excellent solution for positioning applications requiring rapid acceleration and high-speed moves with low mass payloads. The motors are capable of speeds of up to 100 inch/s and the low mass forcer allows high acceleration. The need for lead screws or belts and pulleys is eliminated, adding to the mechanical simplicity. In addition, fewer moving parts and the frictionless air bearing design result in a longer, maintenance-free life. The length of travel is limited only by the length of the platen; increasing length causes no degradation in performance. The motors are capable of unidirectional repeatability to 2.5 µm without the added expense of feedback devices. More than one forcer can operate on the same platen with overlapping trajectories forming a table-top manufacturing system.