Operational range of a ferrofluid pocket bearing

Boots, A. S. T.; Spronck, Jo W.; Ostayen, Ron A.J. van; Lampaert, S.G.E.

doi:10.1088/1361-665x/ab2b60

Cited by 8 publications

(5 citation statements)

References 27 publications

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“…18 FF pocket bearings are an interesting application for fast and precise positioning systems, thanks to the absence of the stick-slip phenomenon, low viscous friction and the fact they are always self-aligning. 19 The phenomenon of magnetic fluid attraction to a permanent magnet is used, for example, in a micro rotarylinear actuator used in minimally invasive active catheters. 20 Another example of use is in rolling bearings.…”

Section: Lubrication Using a Ffmentioning

confidence: 99%

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Research into the lubrication of a rotary lip seal using ferrofluid

Szczęch

2021

Proceedings of the Institution of Mechanical Engineers, Part J:

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The paper presents the results of research into a hybrid seal which is a combination of standard rotary lip seals and a magnetic fluid seal. To maintain the magnetic fluid in the friction zone region, either a specially shaped pole piece was used or the shaft was modified accordingly. The research study concerns the allowable operating pressure and lubrication conditions in short-term and durability tests after which shaft wear was also assessed. Magnetic fluids with different rheological and magnetic properties were considered. The test results showed that the long-term operation of a hybrid seal is possible. The requirements, however, are the appropriate value of the magnetic field and dynamic viscosity of the magnetic fluid.

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Section: Lubrication Using a Ffmentioning

confidence: 99%

Section: Lubrication Using a Ffmentioning

confidence: 99%

Research into the lubrication of a rotary lip seal using ferrofluid

Szczęch

2021

Proceedings of the Institution of Mechanical Engineers, Part J:

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“…Recent studies have shown that the bearing force of the magnetized MF is about 20 times higher than that of the traditional liquid bearing [14]. In addition to the MF support, the gas sealed by MF can also generate a supporting force [15,16]. Then, can the lifting force be used to control the stick-slip behavior and what is the essential mechanism?…”

Section: Introductionmentioning

confidence: 99%

Controlling stick–slip in low-speed motion with a lifting force of magnetic fluid

Hu,

Ma,

Dai

et al. 2024

J. Phys. D: Appl. Phys.

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Stick-slip is a typical friction induced self-excited vibration and it usually occurs in the boundary or mixed lubrication regimes. Broaden the hydrodynamic lubrication regime is conducive to suppress stick-slip motion. In this paper, load carrying capacity of magnetic fluid film in presence of magnetic field was derived based on the modified Reynolds’ equation. An additional lifting force produced by magnetic fluid under magnet was applied between tribopairs to achieve the full fluid lubrication. Thus, the stick-slip is expected to be inhibited in a lower speed scope. The effect of magnet thickness on the lifting force was investigated experimentally and theoretically. Special attention was given to the influence of lifting force on the friction and the critical transition speed of hydrodynamic lubrication regime. Results showed that the lifting force increases with the increment of the magnet thickness. And the existence of the additional lifting force expands the hydrodynamic lubrication and makes the critical transition speed moves left, as shown by the friction transitions on Stribeck curve. Therefore, stick-slip motion can be suppressed at a lower sliding speed. Such beneficial effect is more pronounced with thicker magnets. It can be conformed that, so long as the lifting force is higher than the normal load, the friction will invariably operate in the full film lubrication and the stick-slip motion may be eliminated theoretically.

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“…These ferrofluid bearings have the characteristics of simple structure, controllable viscosity and good anti-friction, which lay a theoretical foundation for the intelligentization of manufacturing industry. [5][6][7] Rosensweig 8 proposed a mechanical model for the ferrofluid's magnetic field forces calculation. The results showed that the oil film viscosity of the ferrofluid bearings was affected by the magnetic flux density, which provided a theoretical basis for the research of the ferrofluid bearings.…”

Section: Introductionmentioning

confidence: 99%

“…Ferrofluid bearings are a kind of sliding bearing with ferrofluid as damping medium, which can realize controllable damping. These ferrofluid bearings have the characteristics of simple structure, controllable viscosity and good anti‐friction, which lay a theoretical foundation for the intelligentization of manufacturing industry 5–7 …”

Section: Introductionmentioning

confidence: 99%

Parameter design and dynamic stability of controllable damping ferrofluid bearing

Liu,

Xu,

et al. 2024

Lubrication Science

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The purpose of this paper is to carry out parameter design and dynamic stability verification experiment of controllable damping ferrofluid bearing. A new type of ferrofluid bearings is designed, and its internal magnetic fields are simulated by the finite element analysis software ANSYS. In this paper, the coefficient of magnetic leakage is taken as the optimization object, and the optimal parameters of ferrofluid bearings are updated. At the same time, the working principle of the ferrofluid bearings test platform is introduced, which includes a servomotor with a controller, an eddy displace sensor, an amplifier and a power supply. Finally, the dynamic stability of ferrofluid bearing is verified by experiments. The experimental results show that when the applied current is less than or equal to 0.08 A, the amplitude of the rotor supported by the ferrofluid bearing decreases with the applied current increment. Besides, the dynamic stability of the rotor is also related to the rotational speed. When the applied current is 0.08 A, the amplitude of the rotor supported by the ferrofluid bearing firstly increases and then decreases with the rotational speed increment. It is proved that the ferrofluid bearings have a strong function of the dynamic stability, which can suppress the vibration of the rotor, and have high accuracy of both position and rotation.

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Operational range of a ferrofluid pocket bearing

Cited by 8 publications

References 27 publications

Research into the lubrication of a rotary lip seal using ferrofluid

Research into the lubrication of a rotary lip seal using ferrofluid

Controlling stick–slip in low-speed motion with a lifting force of magnetic fluid

Parameter design and dynamic stability of controllable damping ferrofluid bearing

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