A Novel Magnetic Screw Motor Utilizing a Modulated Magnetic Flux

Abstract

　A feed screw mechanism is used in various machines and robots. Mechanical screws such as ball and slide screws have various problems due to their mechanical frictions. In order to solve these problems, a magnetic screw which is one of contactless screws has been proposed. Nowadays, magnetic screw motors which a magnetic screw is integrated with a motor are proposed. However, these screw motors require permanent magnets in their mover, and the volume of the permanent magnets increases as the stroke increases. In this paper, in order to solve these problems, a magnetic screw motor whose permanent magnets are in its stator is proposed. The static characteristics of the proposed motor is investigated using 3-D finite element analysis.