| 摘要 |
PURPOSE:To improve the accuracy of antenna directivity, by providing a magnetic bearing controlled with a driving current of each electromagnet in place of a mechanical bearing in an antenna directing device suitable for the applications mounted on an artificial satellite so as to eliminate a friction torque of the bearing. CONSTITUTION:Suppose that the (z) axis among (x), (y), (z) axes is taken as an axis in the directing direction of an antenna. In figure, 6a, 6b, 9a, 9b are electromagnets giving a force in the (x) axis and a torque around the (z) axis, 7a, 7b, 10a, 10b are electromagnets giving a force in the (y) axis and a torque around the (x) axis, and 8a, 8b, 11a, 11b are electromagnets providing a force in the (z) axis and a torque around the (y) axis. The movement of the six degrees of freedon of an antenna fixed frame 2 is controlled by using the twelve electromagnets. Since the antenna is rotated in the directed direction without contacting state by the magnetic bearing, the deterioration in the accuracy of directivity due to the dificulty of lubrication of the bearing is avoided in the use under vacuum and the accuracy of directivity is improved and the weight is made light. |
