Position regulation of magnetic shape memory actuator

Purpose: This paper presents materials with magnetic shape memory. These materials are a new group of smart materials, which distinguished by large deformations (up to 10%), and relatively high operating frequencies. Authors used in research samples made of Ni2MnGa alloy in order to find out of their capabilities in transducers design applications and for better understanding their nonlinear behavior. Design/methodology/approach: For research purposes, authors designed laboratory electro-mechanical transducer, which works in spring retuned operating mode. This transducer is connected with dSPACE system used for regulation and data acquisition process. Coils were connected with programmable DC power supply. Findings: This design of transducer was for Authors a first attempt of practical application of MSMA. Results help in: modelling process of hysteresis for future open loop regulation, finding out optimal working conditions and scope of available operating parameters. Changes will be applied in next transducers design e.g. shape of magnetic circuit and these transducers will have more compact design. Research limitations/implications: Step responses of material are much worse than values given by manufacturer, because response of controllable power supply is up to 0.1 s. Another problem were stiffness of transducer and repeatability of obtaining results, but since modifications it has been successfully eliminated. Practical implications: Implemented in the examined transducer operating mode is identical to the principle of operation of an electromagnetic transducers used in design of electro-hydraulic and electro-pneumatic cartridge valves. In these valves solenoid moves a spool and after a power cut due to the spring tense, it returns to base position. Future work will focus on their replacement by a transducers designed with the use of MSMA. Originality/value: In this paper design with detailed description is presented. It can be treated as guidelines for other scientists who would like to design similar transducers. The article is the base for further research.