永磁伺服电机位置检测系统高性能激励源设计OA

The sources and types of errors in the excitation source of the permanent magnet servo motor position detection system are an-alyzed based on time grid technology,and a high-performance and low-latency excitation signal source generation system is designed based on direct digital frequency synthesis technology and closed-loop feedback control principle.The system takes FPGA as the control center and generates two sine and cosine excitation signals based on DDS technology,realizes real-time feedback of the excitation signal through the signal feedback loop and FPGA control,and solves the problems of poor quality and low position detection accuracy of the synthesized traveling wave signal caused by the unequal amplitude and phase of the two excitation signals by using the sequencing algo-rithm and pulse interpolation counting.Experiments show that the system can greatly improve the problem of unequal amplitude and phase non-quadrature of the output signal of the excitation source,and the secondary error of the synthesized traveling wave signal can be effectively suppressed.The position detection error is reduced from±67.2343′to±15.5396′,the accuracy is increased by 77％,and the response speed of the excitation source is improved.