Permanent magnet dual-coil-driven giant magnetostrictive actuator and working method thereof

Abstract

The invention discloses a permanent magnet dual-coil-driven giant magnetostrictive actuator, which belongs to the technical field of hydraulic servo control. The actuator comprises an outer cover (3), a first end cover (2), a second end cover (12), a bobbin (19), a giant magnetostrictive rod (16), an output rod (14) and a preloaded spring (15). A bias magnetic field generation unit and a driving magnetic field generation unit are arranged on the bobbin (19). The actuator is characterized in that: the bias magnetic field generation unit comprises a bias adjustment coil (8) and a permanent magnet (5); and the driving magnetic field generation unit comprises a drive coil (9). The novel giant magnetostrictive actuator has the remarkable characteristics of high displacement output accuracy, quick response, low heat, intellectualization, bias magnetic field adjustability, preloading force mechanical / electronic joint adjustability and the like.

Description

technical field [0001] The invention relates to the application of giant magnetostrictive materials and belongs to the technical field of hydraulic servo control. Background technique [0002] As a bridge connecting its electrical components and hydraulic mechanical components, the electro-mechanical converter is one of the key components of the electro-hydraulic servo valve and even the hydraulic control system. The performance of the electrical-mechanical converter is directly related to the performance indicators of the electro-hydraulic control system, and some indicators are even related to whether the system can be realized. Improving the frequency response and load capacity of the electro-mechanical converter is the prerequisite for improving the frequency response of the electro-hydraulic servo valve. At present, with the development of advanced manufacturing technology, microelectronics technology and the research and development of converters based on new function...

AI Technical Summary

Problems solved by technology

[0008] To sum up, among the existing giant magnetostrictive electro-mechanical converter drive methods for electro-hydraulic servo valves, although the double-coil drive has the advantages of convenient adjustment of the drive magnetic field, it has the disadvantages of large volume, severe heat generation, and low GMA output accuracy. Disadvantages: Although the permanent magnet single-coil drive has the advantages of low heat generation, compact structure, and small volume, it is inconvenient to adjust the driving magnetic field, especially the demagnetization phenomenon caused by the magnetic drop of the permanent magnet cannot be adjusted in time to affect the GMA control accuracy.

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