摘要
针对传统旋转比例电磁铁不耐高压的不足,提出一种耐高压的旋转比例电磁铁结构。永磁体产生的极化磁通与线圈产生的控制磁通相互叠加,使电磁铁输出与控制电流成比例的双向转矩(转角)。通过磁路、磁场仿真分析和试验研究,分析其静态力矩特性和动态幅频特性,仿真结果与试验结果基本吻合,表明该旋转比例电磁铁结构紧凑、无控制零位死区、输出力矩大(最大输出力矩为±0.65 N·m)、响应快(幅频宽约为190 Hz),具有正磁弹簧刚度、良好的线性度(非线性误差小于3%)及较小的滞环(小于4.5%),可用于直接驱动电液伺服转阀。
Inview of the fact that conventional rotary proportional solenoids are unable to work under high fluid pressure, a novel rotary proportional solenoid capable of withstanding high pressure is presented. The polarizing magnetomotive forces generated by the permanent magnets are superimposed on the control magnetomotive forces, which are provided by the excitation currents flowing in the coils, to make the solenoid produce output torques （angular displacements） proportional to the excitation currents. The static torque characteristics and the amplitude frequency response characteristics are analyzed based on magnetic circuit analyses, magnetic field simulations and experiments. The simulations and measured results agree well and show that the rotary proportional solenoid has advantages of compact structure, no zero dead-zone, large output torques （maximum output torques ±0.65 N · m） and fast response （bandwidth about 190 Hz）. With positive magnetic stiffness, high level of linearity （non-linearity less than 3%） and hysteresis less than 4.5%, the solenoid is suitable for driving the rotary servo valve directly.
出处
《机械工程学报》
EI
CAS
CSCD
北大核心
2008年第9期230-235,共6页
Journal of Mechanical Engineering
关键词
旋转比例电磁铁
耐高压
双向驱动
磁路
磁弹簧刚度
Rotary proportional solenoid Withstanding high pressure Bi-directional driving Magnetic circuit Magnetic stiffness
