Super magnetostrictive actuator

Abstract

The invention discloses a super magnetostrictive actuator. The actuator comprises a shell and a base arranged at the bottom of the shell; a magnetic field generating device, a cooling device, a pre-tightening device and a positioning device are arranged in the shell 1; and the actuator also comprises a detection device used for carrying out performance detection on the super magnetostrictive actuator. According to the invention, a water cooling mechanism and a phase-change material are combined for carrying out temperature control, the water cooling mechanism is used for cooling the outer sideof a coil, and the phase-change material is used for cooling the inner side of the coil, so that the output precision of the giant magnetostrictive actuator is improved, and long-time stable work isguaranteed; the size is small, the weight is light, the output displacement is large, and the output force is large; the pre-pressure and the bias magnetic field are adjustable; the output displacement is big and output force linearity is good; the response speed is high, the control precision is high, and the eddy current groove can further improve the control precision of the output displacement; and meanwhile, a test system composed of a sensor, a signal amplification device and a computer is used for detecting the driving performance of a driver, so the test time is short, and the test efficiency and the test precision are high.

Description

technical field [0001] The invention relates to the technical field of giant magnetostriction, in particular to a giant magnetostriction driver. Background technique [0002] Due to the change of the magnetization state at room temperature, its length and volume will change greatly, that is, the magnetostrictive material with a large magnetostrictive coefficient is called giant magnetostrictive material (GMM), because most of them are rare earth Construction, also known as rare earth giant magnetostrictive materials. This material has high heat-resistant temperature and strong magnetostriction. At room temperature, the conversion rate between mechanical energy and electrical energy is high, the energy density is high, the response speed is fast, the reliability is good, and the driving method is simple. However, when the giant magnetostrictive driver is working, the thermal deformation of the giant magnetostrictive rod caused by the heating of the coil and the maximum outp...

AI Technical Summary

Problems solved by technology

However, when the giant magnetostrictive driver is working, the thermal deformation of the giant magnetostrictive rod caused by the heating of the coil and the maximum output of the controllable displacement of the giant magnetostrictive driver are both tens of microns, which are in the same order of magnitude. Greater impact

At the same time, the heat dissipated by the coil will not only be transferred to the magnetostrictive rod, but will also be transferred from the two ends and the outer surface of the coil to the base, end cover and shell respectively, resulting in its deformation, which will also affect the output of the driver. precision

Therefore, in long-time, high-current, and ultra-high-precision workplaces, the existing driver technology cannot well meet the accuracy requirements

As a new type of driver technology, the magnetostrictive drive has the advantages of high frequency, high Curie temperature, high controllability, fast response, fast switching speed, low power consumption, and small environmental factors. However, due to the output displacement of the magnetostrictive material Shortcomings such as small size restrict the application of magnetostrictive drives

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