The modeling and analysis of operating characteristics and temperature drift of deflector jet servo valve under the wide temperature range

Abstract

The Deflector Jet Servo Valve (DJSV) holds a crucial role within the electro-hydraulic servo system, as its performance directly influences the equipment reliability. DJSV operates within a wide temperature range, and the temperature fluctuations result in the magnetomotive force variations of the permanent magnets and changes in the working air gaps, which influence the operating characteristics of the torque motor and contribute to temperature drift. Consequently, a theoretical model is proposed to comprehensively analyze the impact of these factors on the operating characteristics and temperature drift of the DJSV. The results indicate that as the temperature increases, the magnetic flux of working air gap decreases, while the temperature drift increases. Additionally, among the five initial air gap errors discussed, a centrosymmetric error of less than 0.02 l can significantly reduce the temperature drift. The proposed modeling and analysis method of temperature drift can be used to guide the design and analysis of DJSV in wide temperature range.