| The electro-hydraulic servo control system combines the advantages of both electricaland hydraulic control of high precision, fast response, flexible signal processing, outputpower, compact, light weight advantages. Force feedback hydraulic servo system, thedouble-nozzle flapper two electro-hydraulic servo valve and the direct position feedbackbroader application of the two rotary piston hydraulic servo valve. Compared to forcefeedback for the double-nozzle flapper two electro-hydraulic servo valve, the internalfeedback two slide valve hydraulic servo valve structure is simple, the machining accuracy isrelatively low, oil cleanliness not ask for much, so work reliably,However, because thequality of the two electro-hydraulic servo valve slide valve moving coil linear motor directposition feedback, affecting the natural frequencies and dynamic performance of the valve,resulting in its poor performance, bandwidth is usually30-70Hzonly be used for lessdemanding situations.In this paper, the moving coil linear motor in the two electro-hydraulicservo valve electro-hydraulic servo control system in a direct position feedback to improveThe permanent magnet placement methods and the permanent magnet magnetization directionare analyzed. It is found that the magnetic induction line is not uniform distribution, themagnetic flux density is low, and it is not vertical with the coil current direction. A new typeof five rings Halbach array coil linear motor is presented through placing three groups of coilsaccording to the magnetic induction line. The simulation and experiment results show that theelectromagnetic force of the new motor is about2.5times as before, step response time is6ms,and the bandwidth is277Hz. |
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