Macro-micro linear driver based on GMM

Abstract

The invention relates to a macro-micro linear driver based on a GMM. The macro-micro linear driver comprises a casing body, a permanent magnet, a magnet yoke 1, a fastening screw, a micro moving coil,a GMM rod, an output rod, a rotor support, a fixed base, a linear guide rail, a grating, a water cooling pipe, a micro coil framework, a linear rolling bearing, a sliding rod, a magnet yoke 2, a magnetism isolating sleeve, a macro moving coil and a limiting groove. The macro moving coil is energized to generate Lorentz force, and a rotor moves along an axial direction in a stable magnetic field provided by the permanent magnet to acquire macro displacement. The magnitude of the Lorentz force is in direct proportion to the magnitude of the current in a conductive material. Macro displacement is adjusted by controlling the current. A macro motion system is in a static state after primary positioning is finished. A micro motion system carries out compensation control according to detected system errors to realize secondary positioning. Current is introduced into the micro moving coil. A stable magnetic field is generated around the GMM rod. The GMM rod stretches in the axial direction under the action of the magnetic field, so as to acquire micro displacement. The positioning precision of macro motion is compensated, and therefore accurate positioning of the whole motion is achieved.

Description

technical field [0001] The invention relates to the field of precision positioning, in particular to a GMM-based macro-micro linear driver. Background technique [0002] The ultra-precision feed system with high precision and large stroke occupies an extremely important position in the field of modern cutting-edge industrial production and scientific research. Due to the national gap in the field of ultra-precision machining and testing, it is of great significance to accelerate the modernization of the national defense industry. Giant Magnetostrictive Actuator (GMA) is a micro-displacement output device that converts electromagnetic energy into mechanical energy based on the positive magnetostrictive effect and uses Giant Magnetostrictive Material (GMM) as the core drive element. It not only overcomes the shortcomings of traditional displacement drive devices, but also has a high magnetic-mechanical conversion efficiency that is unmatched by other functional materials. Wi...

AI Technical Summary

Problems solved by technology

However, due to the performance of the giant magnetostrictive material, the maximum driving stroke of the giant magnetostrictive driver is small, generally less than 0.2mm, which is far from meeting the requirement of a large stroke.

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