Abstract
When large stroke of giant magnetostrictive actuator (GMA) is desired, it usually requires large number of turns in coil to generate sufficient magnetic field and therefore induce a considerable inductance in actuator. In this paper, a specific driving method is proposed for electro-hydraulic servo valve based on large inductance GMA. To begin with, a more reasonable model for the dynamics of driving coil is proposed and identified using Particle Swarm Optimization (PSO); then a specific half-SPWM driving mode is proposed taking advantages of this considerable inductance. The multi-coupled model for the overall servo valve is set up and simulated in a joint environment of Simulink and AMESim; a prototyped switching converter based on Micro Controller Unit (MCU) and Insulated-Gate Bipolar Transistor (IGBT) is developed, a series of displacement and power tests are conducted. Both simulation and test results verify the advantages of our design, compared with continuous driver the proposed method drives the coil with less power consumption and a more compact structure; compared with traditional Sinusoidal Pulse Width Modulation (SPWM) driving mode, this method generates a smoother wave using less switch number and less switching losses.
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