The novel MRF-ball-clutch design – a MRF-safety-clutch for high torque applications

Jackel, M.; Kloepfer, J.; Michael, Matthias; Seipel, Björn

doi:10.1088/1742-6596/412/1/012051

Cited by 5 publications

(6 citation statements)

References 1 publication

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“…Jolly et al [4] and Kubìk et al [5] identified at least two stages for the alignment of the particles, which initially form single chain-like structures and then migrate to longer and thicker chain structures. The MR fluid can be used in the socalled 'valve mode' [8,9], particularly in dampers, and in the 'shear mode' [10][11][12][13][14], used in clutches, brakes or other dissipative devices where two surfaces move against each other [15][16][17][18][19][20].…”

Section: Mrf At a Glancementioning

confidence: 99%

Phenomenological studies on magnetic and mechanical remanence effects in magnetorheological fluids

Wiener,

Offenzeller,

Martetschläger

et al. 2024

Smart Mater. Struct.

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Although magnetorheological fluids (MRF) have been used in science and engineering for many decades and several products based on this technology are known, there is still no consistent routine that properly takes into account major effects in the material. The aim of this work is to establish a series of steps, from the preparation of the fluid through the demagnetization routine to the choice of the angular evaluation point, which will allow to achieve stable and reproducible results regarding the material’s response to magnetic fields and mechanical actuation. As a major result of this work, a general demagnetization routine and a method for subsequent reproducible evaluation accounting for the long-term time-dependent behavior of the magnetorheological fluid were identified. Our efforts are aimed at exploring the following targets and questions: How can a stable initial state be ensured? Why is the initial measurement of magnetorheological fluids commonly hardly reproducible? How can reproducible measurements for characterizing the material be obtained? For each of these items, we developed procedures or suggest measures and discuss to what extent they solve the underlying issues and what had to be left for future investigations.

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Section: Mrf At a Glancementioning

confidence: 99%

Phenomenological studies on magnetic and mechanical remanence effects in magnetorheological fluids

Wiener,

Offenzeller,

Martetschläger

et al. 2024

Smart Mater. Struct.

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“…Another important MRF application is intelligent clutches [35,36] that provide a wide torque transmissibility range upon the applied magnetic field. The long-term Figure 14.…”

Section: Mrf Clutchesmentioning

confidence: 99%

“…There are two types of smart clutches as illustrated in Figure 17: disk MRF clutches and bell MRF clutches. They are composed of a rotor, a shaft, a coil, MRF, a small gap, and input and output components [35].…”

Section: Mrf Clutchesmentioning

confidence: 99%

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The Recent Advances in Magnetorheological Fluids-Based Applications

Zareie¹,

Zabihollah²

2020

Emerging Trends in Mechatronics

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The magnetorheological fluids (MRF) are a generation of smart fluids with the ability to alter their variable viscosity. Moreover, the state of the MRF can be switched from the semisolid to the fluid phase and vice versa upon applying or removing the magnetic field. The fast response and the controllability are the main features of the MRF-based systems, which make them suitable for applications with high sensitivity and controllability requirements. Nowadays, MRF-based systems are rapidly growing and widely being used in many industries such as civil, aerospace, and automotive. This study presents a comprehensive review to investigate the fundamentals of MRF and manufacturing and applications of MRF-based systems. According to the existing works and current and future demands for MRF-based systems, the trend for future research in this field is recommended.

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“…In previous papers [1], [2], the authors presented a fail-safe magnetorheological fluid-based clutch [3], [4], [5], [6], excited by permanent magnets and operating without electrical power. It was designed by using a magnetic 3-D Finite Elements code [7] and a magneto/mechanical model [1], developed for the purpose and capable of exploiting the magnetic mesh in order to obtain the transmissible torque.…”

Section: Introductionmentioning

confidence: 99%

An Electrodynamic/Magnetorheological Clutch Powered by Permanent Magnets

2017

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This paper presents an electrodynamic/\ud magnetorheological fluid-based clutch activated using\ud permanent magnets attached to one shaft. During the electromechanical\ud transient phase, when the two clutch shafts rotate\ud at different speed, the Permanent Magnets (PMs) induce eddy\ud currents on some conductive materials strategically placed in\ud the system. The interaction between these currents and the\ud magnetic induction produces an electromagnetic torque which is\ud added to that of the Magneto-Rheological Fluid (MRF), helping\ud the clutch engagement in the start up phase when an extra\ud torque is necessary to overcome possible static frictions. Once\ud the two shafts have reached the same speed, the eddy currents\ud (and consequently the electromagnetic torque) vanish and the\ud torque transmission is assured by the MRF only. The conductive\ud material is arranged as a copper sheet and the performance\ud of the device is investigated. The proposed clutch is analyzed\ud using a 3-D finite-element code which takes into account the\ud B-H curve of the nonlinear materials (e.g. MRF, Permanent\ud Magnets and ferromagnetic materials) and the movement of the\ud different parts. Finally, in order to verify the FEM model, some\ud experimental measurements are performed on a prototype

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The novel MRF-ball-clutch design – a MRF-safety-clutch for high torque applications

Cited by 5 publications

References 1 publication

Phenomenological studies on magnetic and mechanical remanence effects in magnetorheological fluids

Phenomenological studies on magnetic and mechanical remanence effects in magnetorheological fluids

The Recent Advances in Magnetorheological Fluids-Based Applications

An Electrodynamic/Magnetorheological Clutch Powered by Permanent Magnets

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