小型CPT原子钟的数字电路优化研究CSCD

CPT原子钟是一种体积小、功耗低、指标优的新型原子钟。本文对小型CPT原子钟数字滤波算法开展优化研究,采用CIC滤波器前端滤波,低阶FIR滤波器后端滤波。新滤波模块在保证相同的噪声抑制比的情况下,节约逻辑资源,降低整钟功耗。基于以上方案实现的滤波模块,获得了55d B的滤波效果,同时节省了约42%的FPGA逻辑资源。

Modeling and Simulation Research of Multi-phase Motor Drive System

The thesis mainly aims at studying double-Y shift 30 six-phase permanent magnet synchronous motor，which gets the mathematical model that is used for vector control by coordinate change，this thesis also analyses the application in multi-phase motor drive system of which current control strategy which takes straight axis as control scheme meanwhile the thesis shows the vector control frame diagram. Secondly，it also analyses that under the MATLAB simulation circumstance，it set up the simulation model of its motor body control and all modules. Finally，by providing basic motor parameter and theory，calculate the parameter used in simulation and take it into simulation verification. The research shows that the control strategy which has been put forward is effective and also verifies the rationality and accuracy of the mathematical model set up and the simulation model set up，which is very helpful for drive study of multi-phase motor in the future.