力矩马达气隙误差对电液伺服阀零偏的影响
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摘要
基于惠斯通电桥分析伺服阀力矩马达磁路,建立了气隙分布状态与伺服阀零偏之间的关系,当气隙左右对称或上下对称时,力矩马达不存在零偏,反之则存在零偏.建立考虑气隙误差时的力矩马达模型,得到了不对称气隙时的磁通规律、气隙误差与伺服阀零偏、压力增益以及流量增益之间的关系,发现当力矩马达气隙左右对称或上下对称时气隙误差仅影响伺服阀增益,气隙不对称时伺服阀会产生零偏,且伺服阀压力增益和流量增益会随力矩马达气隙增大而减小.
The Wheatstone bridge was applied to analyze the magnetic circuit of the torque motor,and the relationship between the air gap distribution and the zero deviation of the electro-hydraulic servo valve was explained.When the air gap is vertical or right and left symmetrical,the torque motor does not have a zero deviation,otherwise there is a zero deviation.The torque motor model considering the air gap error of the torque motor was established,and the gain of servo valve and the magnetic flux law under different air gap distribution states was obtained.When the torque motor air gap is vertical or right and left symmetrical,the torque motor air gap error only affects the servo valve gain,otherwise there is a zero deviation,and the servo valve pressure gain and flow gain will decrease as the torque motor air gap increase.
The Wheatstone bridge was applied to analyze the magnetic circuit of the torque motor,and the relationship between the air gap distribution and the zero deviation of the electro-hydraulic servo valve was explained.When the air gap is vertical or right and left symmetrical,the torque motor does not have a zero deviation,otherwise there is a zero deviation.The torque motor model considering the air gap error of the torque motor was established,and the gain of servo valve and the magnetic flux law under different air gap distribution states was obtained.When the torque motor air gap is vertical or right and left symmetrical,the torque motor air gap error only affects the servo valve gain,otherwise there is a zero deviation,and the servo valve pressure gain and flow gain will decrease as the torque motor air gap increase.
引文
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[15]中国航空工业总公司六〇九研究所.GJB 3370-1998飞机电液流量伺服阀通用规范[S].北京:中国航空工业总公司,1998.
[2]KENJI K,CHONGHO Y,TOSHIHARU K.Development of a nozzle-flapper-type servo valve using a slit structure[J].Transactions of the ASME,Journal of Fluids Engineering,2007,129(5):573-578.
[3]訚耀保,李长明,江金林.三维离心环境下的电液伺服阀特性分析[J].机械工程学报,2015,51(2):169-177.
[4]SHARAN A S,HIREMATH S S,VENKATESH CS.Modeling and simulation of Jetpipe servovalve torque motor[J].Applied Mechanics and Materials,2014,592-594:2308-2313.
[5]YAN L,DUAN Z H,ZHANG Q F,et al.Magnetic field and torque output of packaged hydraulic torque motor[J].Energies,2018,11(1):134.
[6]LIU C H,JIANG H Z.Influence of magnetic reluctances of magnetic elements on servo valve torque motors[J].Chinese Journal of Mechanical Engineering,2016,29(1):136-144.
[7]LI S J,BAO W.Influence of magnetic fluids on the dynamic characteristics of a hydraulic servo-valve torque motor[J].Mechanical Systems and Signal Processing,2008,22(4):1008-1015.
[8]KIM D H,TSAO T C.A linearized electrohydraulic servo valve model for valve dynamics sensitivity analysis and control system design[J].Journal of Dynamic Systems,Measurement,and Control,2000,122(1):179-187.
[9]GORDIC D,BABIC M,JOVICIC N,et al.Effects of the variation of torque motor parameters on servo valve performance[J].Strojni?ki Vestnik,2008,54(12):866-873.
[10]URATA E.On the torque generated in a servo valve torque motor using permanent magnets[J].Journal of Mechanical Engineering Science,2007,221(5):519-525.
[11]URATA E.Influence of unequal air-gap thickness in servo valve torque motors[J].Journal of Mechanical Engineering Science,2007,221(11):1287-1297.
[12]任光融,张振华,周永强.电液伺服阀制造工艺[M].北京:宇航出版社,1988.
[13]弗洛伊德.电路原理[M].7版.罗伟雄,等译.北京:电子工业出版社,2005.
[14]訚耀保,王玉.射流管伺服阀前置级压力特性[J].航空动力学报,2015,30(12):3058-3064.
[15]中国航空工业总公司六〇九研究所.GJB 3370-1998飞机电液流量伺服阀通用规范[S].北京:中国航空工业总公司,1998.