Study of the influence of ferromagnetic material on the characteristics of an actuator based on ferrofluid and permanent magnets

Arcire, Alexandru; Olaru, Radu; Petrescu, Camelia

doi:10.1109/icepe.2012.6463838

Cited by 2 publications

(1 citation statement)

References 9 publications

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“…This enables rotary shafts to be sealed without the common disadvantage of wear [19,20], like in vacuum feedthrough [21] or aqueous environments [22]. Ferrofluid bearings and seals can be optimised by maximising the magnetic force generated by permanent magnets using ferromagnetic material [23][24][25]. The absence of stick-slip also makes ferrofluid bearings useful in high precision systems [26][27][28][29][30].…”

Section: Introductionmentioning

confidence: 99%

Operational range of a ferrofluid pocket bearing

Boots

Spronck

Ostayen

et al. 2019

Smart Mater. Struct.

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Ferrofluid pocket bearings are interesting for fast and precise positioning systems thank to the absence of stick-slip, the low viscous friction and their cost-effective nature. However, the characteristics of the bearing change due to over(de)compression since air escapes out of the enclosed pocket. This article presents an experimentally validated model that includes the air mass inside the pocket in the calculation of the equilibrium position of the ferrofluid bearing. Moreover, a simple and efficient way to obtain the operational range of the bearing is presented and a sensitivity analysis was performed. The sensitivity analysis showed that ferrofluid pocket bearings are always self-aligning and that the tilt stiffness increases when the fly height decreases or the tilt angle increases.

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