| 摘要 |
PROBLEM TO BE SOLVED: To provide a linear actuator capable of extending the lifetime of a support mechanism for supporting a movable element and improving positioning accuracy of the movable element, in the structure in which the movable element is movably cantilever-supported. SOLUTION: A linear actuator includes: a movable element 2 that is movably cantilever-supported at a support base along a predetermined reciprocation direction; a stator core 10 that has stator-side opposing parts 10b so as to form a first gap gp1 and a second gap gp2 between the stator-side opposing parts and the portions displaced from the support base of the movable element 2; and permanent magnets 12a, 12b, 12c, and 12d that are oppositely disposed so as to reverse each magnetic pole of a surface on the opposing part of the other permanent magnet, and the movable element 2 is reciprocally moved by applying power to a coil 11. Electromagnetic attraction forces F3 and F4, mutually attracting the movable element 2 in opposite directions, are generated in the first gap gp1 and the second gap gp2, respectively. Different strength is set to the electromagnetic attraction forces F3 and F4, and thereby providing a electromagnetic supporting unit 3 electromagnetically supporting the movable element 2 by a biasing force obtained by the difference between the electromagnetic attraction forces F3 and F4. COPYRIGHT: (C)2012,JPO&INPIT |
