Modelling And Simulation Of Flux Observer At Zero/Very Low Speed Situation And The Design Of High Performance Digital Platform

Digital platform is the basis of morden motor control system. In this thesis, A new dual-DSP system is given out to improve the performance obviously. TMS320LF2407A focuses on the side of control while TMS320VC33 deals with all complicated calculation. Because we make use of their advantage fully and let them cooperate reasonablely, we can descend the control period obviously. The Dual-port RAM is used to realize the communication between the two DSPs.How to improve the accuracy of Flux observer is very important in high-performance motor system, especially at low-speed or zero-speed situation. High-frequency signal injection is believed the efficient method to solve these difficuilties. When high-frequency signal is injected into the machine, there will be impedances differences between the flux axis(d) and the quadrature axis(q). In released papers, we can only see the real IM experimentation but not any simulation results. Perhaps the difficulty is how to build a IM model which not only can work at common state but also can embody the high-frequency characteristic. In this thesis, we build two different parts separately to realize two different states, but we use speed, angle of flux and son on to connect them into one model. We just call it as "model superposition". A new flux observer is bringed out based on this IM model. Simulation experimentation indicates that estimated flux angle coincides with the actual angle.This project is supported by NSFC(No.50177014) and the Tenth-five year preresearch program(No.402060201).