Differential-mode magnetic control shape memory alloy actuator

Abstract

A differential magnet-control shape-memory alloy performer includes MSMA elements, a magnet, an excitation coil, iron-core, two pairs of magnet baffle plates, a connecter and an excitation circuit controller. Excitation coil is winded on the iron-core laminated by dynamic steel, the connector is at center of the gap preserved between two cores, the MSMA elements magnet baffle plates and the magnet are set symmetrically along the gap from the connector to both sides, the two cores are connected by a press board and screws, finally, the excitation coil is connected to the current controller. The magnet generates bias magnetic fields with equal diameter and same direction in two MSMA elements and the excitation coil current generates a control magnetic field in equal diameter and counter direction, one field is increased, the other is reduced by laminating the two fields. The connector moves since the deformation volumes of the two MSMA elements are different to control the shift of the performer.

Description

technical field [0001] The invention belongs to a magnetically controlled actuator, in particular to a magnetically controlled shape memory alloy actuator controlled in a differential manner. Background technique [0002] Among the new functional materials, the shape memory alloy has a large deformation rate and is more suitable for the manufacture of actuators. There are two types of shape memory alloys: temperature control type and magneto control type. The former controls the deformation of the material by changing the temperature, and the latter controls the deformation of the material by changing the magnitude of the magnetic field. Since both heating and cooling require a process, the dynamic response speed and application range of the temperature-controlled actuator are limited. [0003] MSMA (Magnetically Controlled Shape Memory Alloy) is a new type of nickel-manganese-gallium (NiMnGa) alloy material with shape memory that was discovered in 1993. It not only has a l...

AI Technical Summary

Problems solved by technology

Disadvantages of this structure: First, the excitation power of the electromagnet S required to produce a sufficiently large deformation of the MSMA is relatively large; second, the preload of the recovery spring is not easy to adjust accurately and has mechanical inertia, which affects the control accuracy and reduction of the MSMA actuator. Third, the magnetic control characteristics of MSMA materials are sensitive to temperature, and changes in ambient temperature affect the working stability of the actuator.

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