Two-stage electro-hydraulic servo valve based on giant magnetostrictive electro-mechanical actuator GMA

Abstract

The invention discloses a two-stage electro-hydraulic servo valve based on a giant magnetostrictive electro-mechanical actuator GMA and belongs to the technical field of hydraulic servo control. The two-stage electro-hydraulic servo valve comprises a valve body (3), a valve core (4), a left spray nozzle (6), a right spray nozzle (7), a hinged baffle (11), a feedback rod (5) and a giant magnetostrictive actuator. The giant magnetostrictive actuator comprises a left end cover (9), a centering and adjusting screw (8), a centering spring (10), an end cover (13), a right end cover (21), a butterfly-shaped spring (14), an output rod (15), an adjusting screw (22) and a giant magnetostrictive rod (19). The output rod (15) is connected with the hinged baffle (11); and through the hinged baffle (11) with one fixed end, the amplification and the transfer of displacement are realized. A force feedback secondary servo valve is formed by the hinged baffle (11) with a displacement amplification function, the feedback rod (5), a prestage spray nozzle-baffle valve and a power-stage slide valve. The two-stage electro-hydraulic servo valve based on the giant magnetostictive electro-mechanical actuator GMA has the characteristics of quick response, high frequency response, high control flow rate and the like.

Description

technical field [0001] The invention relates to the technical field of hydraulic servo control, in particular to a two-stage electro-hydraulic servo valve of a giant magnetostrictive electric-mechanical converter GMA. Background technique [0002] The electro-hydraulic servo valve is the core part of the electro-hydraulic servo system, connecting electrical components and hydraulic mechanical components, and its performance will directly affect the working performance of the entire system. The traditional electro-hydraulic servo valve is driven by an electromagnetic torque motor. Due to its large volume and weight, limited working bandwidth, low energy density, slow response speed, and poor anti-interference ability, it can no longer meet the requirements of modern industry for fluid control systems. To improve the performance of the electro-hydraulic servo control system, the bandwidth and response speed of its electro-mechanical converter must be improved. With the develo...

AI Technical Summary

Problems solved by technology

At present, the research of micro-displacement drivers mainly focuses on the application of electrostrictive material PMN and shape memory alloy SMA. The driver based on electrostrictive material PMN has a high operating bandwidth, but the output displacement is small, and there are drifts and hysteresis during operation. , poor stability

The converter based on the shape memory alloy SMA has a large output displacement, but there are disadvantages such as slow response speed, discontinuous deformation, and inability to be precisely controlled.

Images