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Direct Torque Control of a Permanent Magnet Synchronous Motor Based on Fuzzy Logic

Sun Dan He Yikang Zhi Dawei(Zhejiang University 310027 China)  
Firstly,the basic theory of the Direct Torque Control(DTC) on a Permanent Magnet Synchronous Motor(PMSM) is analyzed and then the difference of applying DTC on Induction Motor(IM) and on PWSM is also pointed out to decide a specific strategy for DTC on PMSM.In PMSM of DTC,an inverse voltage space vector was selected instead of the zero voltage space vectors in DTC on IM to enhance the torque response.For the sake of improving the static and dynamic performance of the system,fuzzy logic idea is introduced into the system.In the fuzzy DTC system,the stator flux linkage error,torque error and flux linkage angle of PMSM were all properly fuzzified into several fuzzy subsets to accurately select the voltage space vector in order to smooth the torque,flux linkage and quicken their response.The stator flux linkage angle was also mapped onto a limited region to minimize the number of fuzzy rules,shorten computation time and improve the response speed.Simulation results indicated that the fuzzy DTC strategy,which is designed base on the characteristic of the PMSM,is able to achieve more superior operation performance than that of the conventional DTC.
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