Super magnetostrictive actuator driving single-stage direct-acting jet pipe servo valve

Abstract

The invention discloses a super magnetostrictive actuator driving single-stage direct-acting jet pipe servo valve, and belongs to the technical field of hydraulic servo control. The servo valve comprises a valve body (16), a flow distributor (8), a pair of electro-mechanical converters, and a pair of micrometric displacement amplifiers positioned between the electro-mechanical converters and the flow distributor (8), wherein each electro-mechanical converter comprises a thermal compensation hood (5), a super magnetostrictive rod (10) mounted in the thermal compensation hood, and a coil frame (2) positioned outside the thermal compensation hood (5), and also comprises a drive coil (4) and a bias coil (3) which are orderly wound outside the coil frame (2); each micrometric displacement amplifier comprises a cylinder, a big piston (9) arranged at one end of the cylinder and connected with the corresponding super magnetostrictive rod (10); and the other end of the cylinder is connected with the flow distributor (8). The jet pipe servo valve has obvious characteristics of quick response, big driving power and control flow, 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] The traditional structure of the jet tube servo valve is generally composed of torque motor, jet tube, nozzle, double receiver, etc. The torque motor is used to drive the deflection of the jet tube, and the deflection of the jet tube can change the pressure and flow in the double receiver. The flow change can be used to drive the slide valve or the hydraulic actuator in the small and medium power hydraulic servo system, and the control of the slide valve or the hydraulic actuator can be realized by controlling the output force and displacement of the torque motor. [0003] Due to the small output power of the torque motor, the early jet tube servo valves mostly adopted a two-stage structure, as described in Document 1 (Analysis and Design of Hydraulic Control Systems, edited by Lu Chan...

AI Technical Summary

Problems solved by technology

[0005] Whether it is the early ordinary jet tube servo valve or the later deflector plate type jet tube servo valve, its working reliability and work efficiency are much higher than that of the nozzle flapper servo valve, but its biggest disadvantage is the large inertia of the jet tube, which leads to the inherent torque motor part. The frequency is low, so the response is slow; the deflection plate jet tube servo valve has a greatly improved response speed due to the reduction of the inertia of the deflection part, but due to the limitation of the output power of the torque motor, the response speed is further improved and its ability to directly control the load is limited, and its control flow is also small

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