| Permanent magnet synchronous machines(short for PMSMs)using permanent magnets as field excitation source,result in significant advantages in efficiency and power density over asynchronous machines,as well as much simpler mathematical model.Hence,recently the applications of PMSMs in new-energy electric vehicle drives and servo systmes are very successful.This thesis chooses PMSMs as the research object,and aims at stable operation of the PMSM-based drive system.A series of analysis and design on the adaptive control strategies are carried out,and the arrangements of this thesis are as followed:(1)Three modeling methods for PMSMs,namely,vector,matrix,and spiral vector,respectively,are analyzed,and the detailed mathematical derivations of three modeling methods are given with the evaluations of the pros and cons of each method.(2)Based on IEEE Strandard,the stand-still frequency response(short for SSFR)measuring method is introduced.Then,the measuring principle is analyzed in detail with the completed steps for measureing.Finally,the dq-axes inductances of the discussed PMSM is measured by the SSFR method.(3)A new algorithm for producing the duty signals of space vector pulse width modulation(SVPWM)is proposed with reduced computational complexity,system operation speed and cost of micro controlled unit(MCU).The programming process in detail of this algorithm is given and implemented on the Texas instrumentsTM C2000TM F28335 MCU,and the results verifies the effectivenss of this algorighm compared with the traditional algorithm.(4)A mechanical parameters on-line measureing method for PMSM drives is proposed based on a torque closed loop.Firstly,the no-load torque and friction coeffcient of the PMSM drive system can be measured by a steady electromagnetic torque.Then,the inertia of the PMSM drive system can be measured by a hybrid torque signal composed of a pure sinewave component and a direct current(DC)-biased component.(5)Based on classic control theory,the PI controller parameters of a PMSM drive system are acquired and turned through a time-domain and frequency-domain combined method.The corresponding experiments of the PMSM drive system are conducted and the self-turning process and performance evluatation are analyzed under different operation conditions.(6)On the basis of conventional slide-mode variable-structural observers,a coupled metod composed of variable frequency filter and fixed frequency filter is proposed for position and speed signal observations in the sensorless control of PMSM drives.The different usuage modes with corresponding performance benefits of the combined filter method are analyzed,and verified by experiments.In addition,in terms of the circumstances with special requests on position accuracy,the choosing methods of position sensors are analyzed and summarized in detail.(7)The design and implementation of the hardware for the PMSM drive controller are accomplished.Firstly,the primary difference and application occasions of different sampling circuits and analyzed,with particular emphasis on the cost and performance.Then,the gate-circuits of IGBT/MOSFET drivers are designed and analyzed.Finally,the common choosing methods and design schemes of power sources for PMSM drive are analyzed.(8)The design method and process of the digital filter based on Matlab/FDATool are given in Appendix,including the performance analysis of digital filter and software programming. |
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