There are several applications where planar drive systems consisting of more than one planar drive unit are needed. In order to control the planar drive system, the position of the planar drive units on the work surface should be determined. This paper provides an overview of available positioning principles and solutions for the position determining of the planar drive units with large range of motion (up to 10 m) on the work surface. The advantages and disadvantages of the typical topologies and measurement methods for position determination are analyzed. State-of-the-art systems which provide accuracy of positioning better than 1 mm are considered.

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