外滾筒式多磁極磁流變液阻力器之開發與應用

Development and Application of a Multi-pole Magnetorheological Resistance with Exterior Rotor

黃冠達(Guan-Da Huang 黃冠達)

指導教授 ： 蕭耀榮

國立臺北科技大學/機電學院/車輛工程系所/碩士(2013年)

https://doi.org/10.6841/NTUT.2013.00408

摘要

磁流變液(magnetorheological fluid，MRF) 是新型開發中的智慧型材料，隨著外加磁場而產生不同之剪應力，且剪應力與磁場之關係近乎線性，而其在控制之反應快速且可逆，故在自行車、汽車、機車、生醫、機械人產業上都可適用。
傳統之MRF煞車器以圓柱型為主體，由外而內依序為外筒、線圈、MRF以及內盤，而線圈所產生之磁場對MRF作用面積較小，因此提供阻力較小。
本研究為了改良傳統MRF煞車器阻力而設計一新型之外滾筒式MRF阻力器，把磁極放置在內部，並密封住MRF。內部機構為在MRF周圍擺放複數個T型磁極，每個磁極的磁通方向與相鄰磁極相反，產生的磁通量可垂直穿透MRF增加磁場作用之面積，使整體的煞車扭力大幅增加。本研究進行MRF阻力器外觀及整體結構之設計，並用磁路分析預測各部位最佳尺寸，配合磁場模擬軟體進行MRF阻力器結構分析，且找出各部位最佳化尺寸，同時也搭配軟體建立驅動控制平台並進行系統之測試分析。外滾筒式阻力器機構之設計能夠有效發揮MRF的特性，扭力與體積的比值和傳統磁流變液煞車器較佳，因此本研究之機構設計為較佳的設計。

關鍵字

磁流變液 ； 磁流變液阻力器 ； 自行車阻力器

並列摘要

MRF is an intelligent liquid with outstanding performance. By the change of magnetic field, it can produce different shear stress. The relationship between shear stress and the magnetic field of MR fluid is near linear. The transformation is also quick and reversible. Those excellent characteristics enable the possibility for industrial application, such as vehicles, biomedical, robotics, etc.
Tradition MR brake contains a cylinder with coil winded surrounding. The MRF is filled between stator and the inner disk. MR fluid is place under the magnetic field created by the coil which is weak, thus resulting less resistance.
This research presents a new design of magnetorheological resistance to improve disadvantage of tradition MR brake. MR fluid is place between a stator that is placed inside the surrounded rotor. The internal structural of stator is created by multiple T-shaped poles. The magnetic flux direction of each pole is opposite to the adjacent poles. The active chaining areas for the MR fluid are greatly increased, to improve significant brake torque. This research designs the 3D model of overall structure of the MR resistance. Magnetic circuit analysis was used to predict optimized sizes of the various parts. Program was employed to establish control platform and performed test and analysis to the system. Multi-pole MR resistance with exterior rotor was designed to effectively employ MR fluid in generating resistant torque.Its torque-to-volume ratio is better than one of conventional MR brake. Therefore, this study provides a better design for MR brake research.

並列關鍵字

Magneto-Rheological Fluid (MRF) ； MR resistance ； Bike resistance

參考文獻

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