磁阻旋转变压器位置检测的电磁干扰抑制方法

EMI Suppression Method of Position Detection for Variable Reluctance Resolver

由于航空发动机用高速起动发电机电感低、频率高,控制器对起动发电机进行控制时会对磁阻旋转变压变压器产生干扰。为保证良好的位置检测,需对电磁干扰进行抑制。通过对磁阻旋转变压器的磁场耦合和电场耦合电磁干扰的分析,确定了减小旋转变压器绕组匝数的磁场耦合干扰抑制策略,和在磁阻旋转变压器输出参考地与机壳地间添加电容的电场耦合抑制策略。采用锁相环来对位置角度信号进行平滑,构建了锁相环环路特性分析模型,提出了锁相环的参数确定方法,并对锁相环造成的相位超前进行补偿。采用中值滤波来对位置角度信号的尖刺进行滤波,提出了无需排序运算的中值滤波算法,并对中值滤波造成的相位滞后进行补偿。实测结果表明:所提出的磁场干扰抑制策略、电场干扰抑制策略、锁相环滤波算法和中值滤波算法有效可行。

Due to the low inductance and high frequency of the high-speed starter-generator used in aero engine,variable reluctance resolver can be interfered when the controller drives the starter-generator.In order to ensure motor position can be well detected,electromagnetic interference(EMI)needs to be suppressed.Based on the analysis of magnetic field and electric field coupling EMI,the strategy of reducing the number of winding turns of resolver was determined to suppress magnetic field coupling interference,and the strategy of adding capacitance between the ground of the resolver output and the shell was proposed to suppress electric field coupling interference.The phase locked loop(PLL)was used to smooth the position angle signal.Base on the constructed loop characteristic analysis model of the PLL,the parameter determination method of the PLL was proposed,and the phase lead caused by the PLL was compensated.The median filtering was used to filter the spikes of the position angle signal.The median filtering algorithm without sorting operation was proposed,and the phase lag caused by the median filtering was compensated.Experimental results verify that the proposed magnetic field interference suppression strategy,electric field interference suppression strategy,PLL filtering algorithm and median filtering algorithm are effective and feasible.