| 摘要 |
PURPOSE:To exercise the special character of a magnetic bearing fully, and enable to improve reliability and to acquire a long service life, by furnishing a temperature decreasing device for a rotor, so as to decrease the temperature of the rotor, where a magnetic ring to consist a magnetic bearing is arranged, below the Curie temperature of the magnetic ring material. CONSTITUTION:A target plate 3 is not connected directly to a rotor 4a but linked through a target fixing shaft 15 made of a metallic material with a low heat-conductivity and a high-temperature strength such as tungsten or molybdenum, for example, and moreover, some measure is prepared to provide a low heat-conductivity at the connection 17 between the target plate 3 and the target fixing shaft 15. The target plate 3 and the target fixing shaft 15 are connected directly. The target fixing shaft 15 and the rotor 4 don't contact at the whole surface but only at the peripheral portion, by making a concave 15a at the center of the fixing shaft 15, and screwed by bolts 16. |
