Potential of Ferromagnetic Shape Memory Alloys as Power Units in Hydraulic Pumps

Abstract

Ferromagnetic shape memory alloys (FSMAs) are a group of materials, whose shape can be controlled by an external magnetic field. Their application as power units in hydraulic pumps may enhance the efficiency and lead to further advantages such as a lower wear, the ability of providing high dosing accuracies and ultimately the option of external actuation along with the associated simplicity of sealing and miniaturization. However, the use of FSMAs in hydraulic pumps is rarely covered in literature. The present article provides fundamental knowledge about the integration of FSMAs in hydraulic pumps and outlines outstanding issues. A simulation model provides information about the characteristics of a piston based hydraulic FSMA pump. The results of a parameter variation reveal the potential of FSMA-driven hydraulic pumps with special regard to $10\mathrm{M$ Ni-Mn-Ga and point out several parameters affecting their performance. Obtaining pressure differences and volume flow rates of reasonable orders of magnitude, the results affirm the technical suitability of FSMAs as power units in hydraulic pumps.