Effect of magnetic fluids on the efficiency of an electromagnetic actuator prototype
Ferrari, G.; De Lazzari, C.; Mimmo, R.; Tosti, G.; Ambrosi, D.
International Journal of Artificial Organs 14(1): 33-42
1991
ISSN/ISBN: 0391-3988 PMID: 2032747 Document Number: 376446
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.