| Giant Magnetostrictive Material is a new type of smart material and has wideapplication prospects in the sophisticated and ultra-precision positioning and drivefield, because of high efficiency of energy conversion, large output force, facility ofdriving etc.There is often interference power during the process of Giant MagnetostrictiveActuator(GMA), such as, reaction force of the load inertia, the friction coming fromthe load and transmission. They are main error sources of interference, whichseriously affect the positioning accuracy. We can get the small changes caused byoutside interference power using GMM itself features. This is the basis of closed-loop control of the giant magnetostrictive micro-displacement system. We make thedirect-acting GMA as research object to achieve self-sensing function initially. Thetopic is as follows:The deflection of the magnetic domains of the giant magnetostrictive materialunder external force and theory of two-way exchange of the GMA are analyzed inthis paper. The model of the magnetic drive coupling is established. Ultimately thebridge circuit is used as the decoupling method to achieve self-sensing and designsthe corresponding amplification and filer circuit. GMA is used for precision andultra precision drive and positioning. To achieve high-precision positioning is notonly related to the mechanical structure design but also related to the accuracy ofthe drive current. Besides, establishment of the drive current time is a certainrequirement in order to achieve fast positioning. The paper designs the dedicatedcurrent source for GMA. The influence of temperature on GMM is very large. GMAis a current-driven device; the heat generated by the drive current is inevitable.Detection of the temperature of the magnetostrictive rod is necessary. Sensingcircuit of the temperature and magnetic induction intensity is designed. At last, therange of voltage caused by the inverse magnetic effect is0.5mV~1.2V, themeasurement error of F signal is6.3%. |
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