Two-stage jet nozzles series super-magnetostrictive jet servo valve and operating method thereof

Abstract

The invention relates to a two-stage jet nozzles series super-magnetostrictive jet servo valve and an operating method thereof, which belong to the field of a hydraulic servo control technique. The two-stage jet nozzles series super-magnetostrictive jet servo valve provided by the invention comprises an upper end cover (4), a lower end cover (26), a super-magnetostrictive rod (14), an output rod (21), a coil skeleton (8), a polarization magnetic filed generating unit and a driving magnetic field generating unit, wherein the upper end cover (26) is provided with a left valve core installation cavity (45) and a right valve core installation cavity (46) which are symmetrical relative to the axis of the output rod; a group of valve core components are respectively installed in the left valve core installation cavity (45) and the right valve core installation cavity (46); and wedge-shaped amplification mechanisms are formed in the contact positions of the output rod (21) and the left and the right valve core installation cavities. The two-stage jet nozzles series super-magnetostrictive jet servo valve provided by the invention has the advantages of great pressure gain and rapid response, and the driving part has the obvious characteristics of small heat radiation, adjustable polarization magnetic filed, intelligentized effect 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 servo valve is generally composed of a torque motor, a jet tube, a nozzle, a 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 change can be used to drive the spool valve or the hydraulic actuator in the small and medium power hydraulic servo system, and the control of the spool valve or the hydraulic actuator can be realized by controlling the output force and displacement of the torque motor. [0003] Document 1 (two-phase opposed giant magnetostrictive self-sensing force feedback two-stage servo valve and control method, Wang Xinhua, national invention patent, patent application number: 200710178688.2) proposed a g...

AI Technical Summary

Problems solved by technology

[0004] There are several defects in this kind of servo valve and its working method: it is driven by two giant magnetostrictive electro-mechanical converters, which increases the complexity of the structure and drive; it is necessary to ensure that the temperatures of the two giant magnetostrictive rods are equal, The thermal expansion must be equal to ensure that the servo valve is less affected by temperature; the bias magnetic field is generated by the energized coil, because the bias magnetic field strength is required to be constant when the servo valve is working and the bias magnetic field strength is relatively large, so the bias coil heats up seriously , and the cooling system design is not carried out, which will not only cause energy loss, but also reduce the performance of the servo valve

[0011] In the existing giant magnetostrictive electro-mechanical converter drive mode 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. Although the coil drive has the advantages of low heat generation, compact structure, and small volume, it is inconvenient to adjust the drive magnetic field, especially because 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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