Abstract
In this paper, using the displacement function, the basic equations of the displacements of the flexible ring for the drive are presented. The electromechanical coupled force between the flexible ring and stator for the drive is given. The electric field force and the displacement function are all defined in Fourier series form. Using the boundary condition of the flexible ring, undetermined coefficients of these equations are obtained, producing displacements of the flexible ring. The displacement distributions and the relationships between the average radial displacement and voltage are given. Changes of the displacements along with drive parameters are also analysed. Results show that periodical changes of radial displacement will cause periodical changes of capacity, which will create an electric field force to drive the flexible ring and make it rotate. In order to obtain a larger electric field force, the two free ends condition should be selected. In order to obtain a larger electric field force, a larger radius and width of the ring, smaller thickness and clearance, and proper voltage should be used. The results are useful in design and manufacture of the drive system.
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