Conventional techniques to position moving platforms on precision machines have relied heavily on mechanical drives such as the ball-nut/lead-screw system. Unfortunately, as positioning tolerances become more and more demanding, the cyclic errors—inherent even in precision gear drives—contribute an excessive amount of positioning uncertainty. The linear-motor drive system is one approach to provide a smooth, accurate, vibration-free method for locating a moving platform. This report discusses some existing uses of linear motors in industry as well as potential future applications on precision machines.
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