EDDY CURRENT DAMPER

• Main Authors: IMANISHI KENJI, NOGAMI YUTAKA, SANO KUMPEI, MASUI RYOSUKE, NOGUCHI YASUTAKA
• Format: Patent
• Language: English; Japanese
• Published: 24.06.2019
• Subjects: BLASTING; BUILDING; BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; ENGINEERING ELEMENTS AND UNITS; FENCING; FIXED CONSTRUCTIONS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS; 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 damper capable of suppressing excessive temperature rise of a conductive member and a permanent magnet.SOLUTION: An eddy current damper 1 comprises a conductive member 8, a magnet holding member 4, a first permanent magnet 6, a second permanent magnet 7, a screw shaft 2 and a ball nut 3. The cylindrical conductive member 8 has conductivity. The cylindrical magnet holding member 4 has a surface 5 opposite to the conductive member 8 at an interval, and a recess part 9 provided on the surface 5. The first permanent magnet 6 is fixed to the recess part 9, and opposite to the conductive member 8 at an interval. The second permanent magnet 7 is fixed to the recess part 9, opposite to the conductive member 8 at an interval, adjacent to the first permanent magnet 6 in a circumferential direction of the magnet holding member 4, and has a magnetic pole arranged inversely to that of the first permanent magnet 6. The ball nut 3 is fixed to the magnetic holding member 4 or conductive member 8, and engaged to the screw shaft 2. Heat conductivity of the magnet holding member 4 is higher than heat conductivity of the first permanent magnet 6 and heat conductivity of the second permanent magnet 7.SELECTED DRAWING: Figure 2 【課題】導電部材及び永久磁石の過度な温度上昇を抑制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、導電部材８と、磁石保持部材４と、第１永久磁石６と、第２永久磁石７と、ねじ軸２と、ボールナット３と、を備える。円筒形状の導電部材８は、導電性を有する。円筒形状の磁石保持部材４は、導電部材８と隙間を空けて対向する表面５及び表面５に設けられた凹部９を含む。第１永久磁石６は、凹部９に固定され、導電部材８と隙間を空けて対向する。第２永久磁石７は、凹部９に固定され、導電部材８と隙間を空けて対向し、磁石保持部材４の円周方向において第１永久磁石６に隣接し、第１永久磁石６と磁極の配置が反転する。ボールナット３は、磁石保持部材４又は導電部材８に固定され、ねじ軸２とかみ合う。磁石保持部材４の熱伝導率は、第１永久磁石６の熱伝導率及び第２永久磁石７の熱伝導率よりも高い。【選択図】図２