圆形磁耦合截面构建的新型时栅位移传感器

现有磁场式时栅位移传感器暴露出机械加工齿槽等分性差和线圈绕制参数一致性差,导致耦合磁场形成的电信号质量较差的问题.针对以上问题,提出了一种以圆形截面铁磁材料替代传统类矩形截面铁磁材料构建耦合磁场形式的传感器设计方法,该方法采用标准件作为基本阵列导磁单元,并以定制的精密线圈绕组设计一种新型的变磁阻式时栅位移传感器.文中首先利用有限元软件ANSYS Maxwell对理论模型的可行性进行了仿真验证,然后通过精度实验获取了误差范围在±1.3"内的误差曲线,仿真与样机实验验证了新型传感器设计方案的可行性.该方法的应用规避了传统的线切割开槽绕线的机械加工形式,可以在有效提高电信号质量的同时大大提高了时栅的生产效率,有利于时栅位移传感器产品化进程的推进.

A Novel Time-grating Displacement Sensor Based on The Circular Magnetic Coupling Cross Section

There exist some problems on the current magnetic-field time-grating displacement sensor,such as the unequal interval of tooth and slot,the inconsistent parameters of coils and the poor quality of electrical signals formed by the coupling magnetic field.To solve the above problems,a new method to design sensor is presented that it uses the ferromagnetic material with a circular cross section to replace the traditional ferromagnetic material with rectangular section to build the coupling magnetic field.The method adapts the standard parts as the basic array permeability units,supplemented by customized precision winding to design a new variable reluctance time grating displacement sensor.Firstly,the feasibility simulation of the theoretical model is verified by the finite element software ANSYS Maxwell.Then,the error curve of error range within±1.3 arc-sec is obtained by the precision experiment.The simulation and practical experiments verify the feasibility of new sensors.The application of this method evade the mechanical processing form of slotting by traditional linear cutting and wiring,greatly improve the quality of output signal and production efficiency,at the same time is good to promoting the transition progress of the time grating sensor.