The paper deals with the design and the\udsimulation of electro-magnetic actuators via\udobject-oriented modelling. The study is carried\udout in the Modelica-Dymola environment, and\udfocuses on the quadruple-coil direct-drive motor\udof a modern fly-by-wire servovalve. Starting from\udbasic information about material properties and\udfrom a schematic representation of the system\udgeometry, the motor model is created mainly\udusing the components of the Modelica_Magnetic\udlibrary. The motor performances are then\udcharacterised with reference to both the normal\udoperating condition (four active coils) and the\udworst-case fault-tolerant condition (only two\udactive coils), in terms of current-to-force and\udcurrent-to-displacement curves. The Modelica\udmodel is finally validated by comparing the\udsimulation results with experimental data obtained\udduring previous research activities. The Modelica\udresults are also compared with those provided by a\udMatlab-Simulink model of the motor, pointing out\udthe advantages of the object-oriented approach for\udthe study of complex electro-magnetic systems.\udThe easy modelling of magnetic circuit networks\udand the inherent simulation of magnetic material\udproperties allow to achieve accurate results very\udefficiently, taking into account physical\udphenomena that are often disregarded during\udpreliminary design phases, such as magnetic\udsaturation or magnetic flux dispersions.
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