EDDY CURRENT-TYPE DAMPER

• Main Authors: IMANISHI KENJI, NOGAMI YUTAKA, SANO KUMPEI, MASUI RYOSUKE, NOGUCHI YASUTAKA
• Format: Patent
• Language: English; Japanese
• Published: 23.05.2019
• Subjects: BLASTING; BUILDING; BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; DYNAMO-ELECTRIC MACHINES; ELECTRICITY; ENGINEERING ELEMENTS AND UNITS; FENCING; FIXED CONSTRUCTIONS; GEARING; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS; GENERATION; HEATING; LIGHTING; MASTS; MEANS FOR DAMPING VIBRATION; MECHANICAL ENGINEERING; SHOCK-ABSORBERS; SPRINGS; SWIMMING OR SPLASH BATHS OR POOLS; TENTS OR CANOPIES, IN GENERAL; THERMAL INSULATION IN GENERAL; WEAPONS

To provide an eddy current-type damper that is capable of preventing degradation of vibration attenuation performance.SOLUTION: An eddy current-type damper 1 comprises: a screw shaft 7; a plurality of first permanent magnets 3; a plurality of second permanent magnets 4; a cylindrical magnet holding member 2; a cylindrical conductive member 5 having conductivity; a ball nut 6 engaged with the screw shaft 7; and ferromagnetic ring parts 12. The first permanent magnets 3 are arranged along the circumferential direction around the screw shaft 7. Each of the second permanent magnets 4 is arranged between first permanent magnets 3, and has an opposite configuration of magnetic poles to the first permanent magnet 3. The magnet holding member 2 holds the first permanent magnets 3 and the second permanent magnets 4. The conductive member 5 faces the first permanent magnets 3 and the second permanent magnets 4 across gaps. The ball nut 6 is positioned inside the magnet holding member 2 and the conductive member 5, and is fixed to the magnet holding member 2. The ferromagnetic ring parts 12 are provided at two ends in the axial direction of the outer peripheral surface of the magnet holding member 2 respectively.SELECTED DRAWING: Figure 2 【課題】振動減衰性能の低下を防止できる渦電流式ダンパを提供する。【解決手段】渦電流式ダンパ１は、ねじ軸７と、複数の第１永久磁石３と、複数の第２永久磁石４と、円筒形状の磁石保持部材２と、導電性を有する円筒形状の導電部材５と、ねじ軸７と噛み合うボールナット６と、強磁性リング部１２と、を備える。第１永久磁石３は、ねじ軸７の周りに円周方向に沿って配列される。第２永久磁石４は、第１永久磁石３同士の間に配置され、第１永久磁石３と磁極の配置が反転する。磁石保持部材２は、第１永久磁石３及び第２永久磁石４を保持する。導電部材５は、第１永久磁石３及び第２永久磁石４と隙間を空けて対向する。ボールナット６は、磁石保持部材２及び導電部材５の内部に配置されて磁石保持部材２に固定される。強磁性リング部１２は、磁石保持部材２の外周面における軸方向の２つの端部にそれぞれ設けられる。【選択図】図２