交流异步电动机变频调速系统的研究

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交流异步电动机变频调速系统的研究
2 008 U-f SPWM U-f SPWM M MATLAB/SIMULINK (GI Given Integer) U-f uc SIMULINK6. 50HZ T nade 1 node PWM Generator 21994-2015ChinaAcademicJournalElcctronicPublishingHousc.Allrightsreservedhttp://www.cnki.nct 1e4 In1 Out 1 Gain Saturation Integrator| i5m0- 8 U-f 6 MATLAB7.O/SIMULINK6. 21994-2015ChinaAcademicJournalElcctronicPublishingHousc.Allrightsreservedhttp://www.cnki.nct ,1997,20-21 [2] MEIITRE B M, MURTIIYNN, KAPOOR S, et al. Segmentation of fingerprint images using the directional images[J]. Pattem Recognition, 1995, 28(3): 678-1683 [3]RAOAR. A taxonomy for texture description and identification[M]. New York: Springer-Verlag, 1990 [4 UI 2000,23(5):57-61 [5 2000 A New Fingerprint Direction Extracting Method Based on Point Direction and block direction MiN Jing-yan, RUAN Hai-rong (Department of Physics Electronic Information Technology, Xiang Fan University, Hubei 441053 Abstract: A new fingerprint image direction extracting method based on point direction and block direction of fingerprint image is presented in this paper. The fingerprint image is blocked and the direction is obtained using the point direction method. The speed is improved because the algorithm of point direction is simple. Moreover, since the excellent performance of combining the point direction and block direction, it can also yield satisfactory results for mutation of direction. It is a fast and exacting approach for extracting fingerprint image direction Experiments prove that the method is 9% lower in p than point direction method and 7% lower than block direction method, and the method is more robust for all kinds of fingerprint image Key words: Fingerprint image; Point direction; Block direction: Directional message 2004 [2 MATLAB M 2005 IMI 2004 Research on System of frequency Conversion and Speed Regulation of Exchange Asynchronous Motor and Its emulation CHEN Ming, chen Jun- 1Departmcnt of Physics Elcctronic Information Tcchnology, Xiangfan Univcrsity, Xiangfan 441053, China 2. Health Supervision Bureau Xiangfan, Xiangfan 441000, China Abstract: based on the analysis of principles of frequency conversion and speed regulation of eschange asynchronous motor, thc cmulatcd softwarc of MaTLaB/SimulinK is applicd to achicvc thc emulation of cxchange asynchronous motor controlled by rotating spccd opcn loop constant voltage. At last, thc rcsults of mulation are analyzed in detail Key words: Exchange asynchronous motor; Frequency conversion and speed regulation of Exchange asynchronous Emulation of simulinK 21994-2015ChinaAcademicJournalElcctronicPublishingHousc.Allrightsreservedhttp://www.cnki.nct

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