title: Effect of magnetic fluids on the efficiency of an electromagnetic actuator prototype.
abstract: An electromagnetic actuator to substitute ventricular function presents some advantages compared with different energy converters. The drastic reduction of the moving parts leads to greater reliability and an accurate control system can be set up. Its major limitations concern weight, heat dissipation and, finally, the overall pump efficiency which is usually rather low. We investigated the possibility of using magnetic fluids in an electromagnetic actuator. Limitations intrinsic to the magnetic fluids prevent their being used as pumping elements but they can be useful to increase the pump efficiency by reducing losses in the magnetic circuit. A remarkable increase in pump efficiency was attained. It is necessary to point out that in designing the electromagnetic actuator the focus was on the pump efficiency with and without the magnetic fluids more than on its performance.
authors.affiliation: Institute of Biomedical Technologies, CNR, Roma, Italy.
authors.forename: G
authors.initials: G
authors.lastname: Ferrari
authors.forename: C
authors.initials: C
authors.lastname: De Lazzari
authors.forename: R
authors.initials: R
authors.lastname: Mimmo
authors.forename: G
authors.initials: G
authors.lastname: Tosti
authors.forename: D
authors.initials: D
authors.lastname: Ambrosi
mesh_terms: D055590:Electromagnetic Phenomena; D004867:Equipment Design; D005290:Ferric Compounds; D006354:Heart, Artificial; D006353:Heart-Assist Devices; D006801:Humans; D013535:Suspensions
chemical_list: D005290:Ferric Compounds; D013535:Suspensions; C001215:ferrite