Excitation moving-magnet type magnetostrictive micro-displacement actuator

Abstract

The invention relates to an excitation moving-magnet type magnetostrictive micro-displacement actuator. Two main magnetic circuit iron cores are arranged oppositely; an auxiliary magnetic circuit iron core is clamped on the main magnetic circuit iron cores; a mounting seat is fixedly held at ends of the main magnetic circuit iron cores, and a driving motor is mounted on the mounting seat; an S-pole driving permanent magnet and an N-pole driving permanent magnet are accommodated in the main magnetic circuit iron cores and mounted on rotating iron cores of the driving motor respectively; a magnetostrictive material and an excitation permanent magnet are clamped between the main magnetic circuit iron cores respectively; an output shaft is propped against one side of the magnetostrictive material and driven by the magnetostrictive material; press plates are arranged on two sides of the main magnetic circuit iron cores, and multiple press bolts are arranged between the two press plates in a penetrating manner; belleville springs are propped between the press plates and the main magnetic circuit iron cores and arranged on the output shaft in a sleeving manner. With the adoption of the actuator, the macro-displacement produced by driving of the permanent magnets by a rotating motor or a linear motor can be converted into the micrometer-scale micro-displacement of the magnetostrictive material, micrometer-scale control can be realized, and the actuator can meet the high-precision positioning requirement.

Description

【Technical field】 [0001] The invention relates to a displacement driver, in particular to an excitation moving magnet type magneto-induced micro-displacement driver, which belongs to the technical field of high-precision positioning equipment. 【Background technique】 [0002] Smart materials, such as piezoelectric ceramics and magnetostrictive materials, enable micron-scale positioning. After the voltage is applied to the piezoelectric ceramics, the micro-displacement positioning is realized through the piezoelectric positive effect, and the large positioning stroke is realized through the displacement amplification mechanism or the stacking method. The disadvantage of piezoelectric ceramics is that the material itself is relatively brittle, and its tangential load bearing capacity is limited. Different from piezoelectric ceramics, magnetostrictive materials achieve micro-displacement positioning by applying a magnetic field and utilizing the magnetostrictive effect. Comm...

AI Technical Summary

Problems solved by technology

The disadvantage of piezoelectric ceramics is that the material itself is relatively brittle, and the tangential load capacity is limited

The disadvantage of this driving method is that the energy consumption is large and the temperature is high.

The magnetic permeability of magnetostrictive materials is usually low, which requires more ampere-turns to drive, and the current in the coil will cause heat loss

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