| 摘要 |
<p>PURPOSE:To achieve miniaturization and wt. reduction, to increase driving force and to improve controllability, by using an actuator utilizing the interaction of the magnetic field generated from a superconductive coil and a magnetic body as the driving force. CONSTITUTION:For example, when the pressure of the body exerts load on an magnetic core through a pressure receiving plate 3 by an actuator having such a type that a magnetic body 2 processed into a rod shape is inserted in the center of a superconductive coil 1 as a movable magnetic core, the magnetic core is well-balanced at a position sunk by the distance relying on the magnetic field formed in the coil but, contrarily, the reaction force to the pressure of the body at this time can be controlled by the current allowed to flow to the coil. The pressure of the body is controlled by controlling said reaction force. In a bedsore preventing bed constituted by spreading the actuators each utilizing the magnetic field generated from the superconductive coil all over, energy consumption for continuously allowing a constant current to flow to the coil is not present and power is consumed only when a current is changed. Further, since the permanent current allowed to flow to the coil can be also used in order to replenish the other coil with a current, power consumption can be markedly reduced.</p> |
