旋转变压器的数字解码算法研究

Research of digital decoding algorithm of resolver

提出了利用坐标旋转数字计算(coordinate rotation digital computer,CORDIC)算法进行角度解码的方法。利用流水线的思想实现了高速CORDIC算法,并利用仿真数据说明了用软件的方法可以降低在过零点采样引入的误差。编制了用于联合仿真的图形操作界面,便于仿真操作。综合的结果表明CORDIC算法的实现只消耗很少的逻辑资源,在一般的FPGA(现场可编程门阵列)器件中就能实现。仿真结果表明算法的最大角度解码误差为0.013 5°,具有较高的精度。

The coordinate rotation digital computer （CORDIC）algorithm is proposed for angle decoding.The pipelining is applied to implement high-speed CORDIC algorithm.It is demonstrated in the simulations that the error introduced by zero crossing sam-pling could be reduced.A graphical user interface is developed for easy co-simulation.The overhead of proposed algorithm is low,thus it could be implemented on CPLD/FPGA devices.The results of simulation show the maximum angle decoding error is 0.013 5 degree.