This paper describes a magnetically levitated planar actuator with moving magnets. This ironless actuator has a stationary coil array above which a translator with a permanent-magnet array is levitated and propelled in the xy plane. During the movements in the xy plane, the set of active coils is switched, as a result of which the stroke in the xy plane can be made, in principle, infinitely long. Measurements on the realized planar actuator show the feasibility of this concept.
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Jansen et al. (2008) studied this question.
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