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Magnetically coupled leadscrews can have finer pitch than can other types of leadscrews, because the threads of the nut and the shaft are not meshed into each other. This feature can lead to better precision for motion control. To achieve contactless coupling, this type of drive uses aerostatic suspension between the nut and the shaft of the magnetically coupled leadscrew. Determination of load capacity for such drives is discussed in this study. Boundary conditions for the air gap are derived and used to solve the corresponding Laplace equation. The result is then used to calculate air gap permeance and obtain the operating point of the magnet. Finally, relationships between load and design parameters are established for preliminary selection of component dimensions and material properties.Index Terms-Computation of magnetic field, contactless drive, magnetic force calculation, magnetic leadscrew.

Abstract-This paper built a finite element model of the Halbach permanent magnet motor, whose accuracy was verified by comparing the output phase back-electromotive force of the model with that of the prototype motor. Keeping other parameters constant as far as possible, we investigated five variables one by one to find out the law how these variables affect air gap magnetic flux, which is a basis for further optimization research. After a new variable named Cost constructed to reflect the distortion ratio of air gap magnetic flux, this paper performed some optimization experiments by studying five parameters of the motor using Taguchi

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