Giant magnetostrictive actuator with permanet torque output and control method thereof

Abstract

A giant magnetostrictive actuator with permanet torque output and a control method thereof belong to the magnetostrictive actuator field, and particularly relate to a giant magnetostrictive actuator with permanet torque output which uses a giant magnetostrictive rod as the core element and a control method thereof. The giant magnetostrictive actuator is in an axisymmetric structure, wherein a barrel-shaped cylinder is arranged at the bottom of the circular cavity of a barrel-shaped shell which is provided with a circular boss at the bottom and a circular groove in the center; a lower magnetizer is arranged at the bottom of the circular cavity of the cylinder; and a cylindrical magnet yoke is arranged on the upper part of the lower magnetizer. The control method of the giant magnetostrictive actuator comprises the following steps: firstly establishing a permanent torque output control module of the giant magnetostrictive actuator, and secondly using a giant magnetostrictive positive effect model, a giant magnetostrictive inverse effect model and a giant magnetostrictive material elastic modulus model to eliminate the coupling effect of the magnetostrictive positive effect and inverse effect in the giant magnetostrictive rod and ensure that the giant magnetostrictive actuator can complete permanent torque output under the combined action of the current in a coil and an external force.

Description

technical field [0001] The invention belongs to the field of magnetostrictive actuators, in particular to a giant magnetostrictive actuator with constant force output and a control method with a giant magnetostrictive rod as a core component. Background technique [0002] In the manufacturing fields such as precision and ultra-precision machining, micro-displacement actuators with high performance such as high position resolution, large output force, fast response capability and low creep are one of the key units. At present, some types of micro-displacement actuators have some of the above-mentioned performances, such as electrothermal micro-displacement actuators, electromagnetic micro-displacement actuators, piezoelectric ceramic actuators, and shape memory alloy actuators, etc. All important properties required for precision machining. With a large magnetostriction coefficient (1500×10 -6 ~2000×10 -6 ), high electromechanical coupling coefficient, fast response speed ...

AI Technical Summary

Problems solved by technology

At present, some types of micro-displacement actuators have some of the above-mentioned performances, such as electrothermal micro-displacement actuators, electromagnetic micro-displacement actuators, piezoelectric ceramic actuators, and shape memory alloy actuators, etc. All important properties required for precision machining

However, there is no report on using the output force of giant magnetostrictive actuators to achieve constant force cutting

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