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  • 2005-2009  (1)
  • 1975-1979  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    DSP Based Implementation of Hybrid Fuzzy PI Speed Controller for Direct Torque Controlled Permanent Magnet Synchronous Motor Drive (2007)
    Berkeley, Calif. : Berkeley Electronic Press (now: De Gruyter)
    International journal of emerging electric power systems 8.2007, 2, art6 
    Details
    ISSN: 1553-779X
    Source: Berkeley Electronic Press Academic Journals
    Topics: Electrical Engineering, Measurement and Control Technology
    Notes: This paper presents a Digital Signal Processor (DSP) based implementation of Hybrid of Fuzzy Logic Controller (FLC) and Proportional-Integral (PI) speed controller for Direct Torque Controlled (DTC) Permanent Magnet Synchronous Motor (PMSM) drive. The fuzzy membership function is used for hybrid control of these two FLC and PI speed controllers in such a way that at the time of dynamic conditions such as starting, the degree of belonging for FLC speed controller is higher than the PI speed controller and near set point the degree of belonging of PI controller is having higher weightage. The simulation model of the drive system is developed in MATLAB environment with simulink, PSB and FLC toolboxes to analyze the performance of the PMSM drive system. This hybrid speed controller is found suitable for DTC based PMSM drive to maintain the high level of performance while maintaining the excellent response at the time of starting, speed reversal, load perturbation and steady-state operating condition of the drive.
    Type of Medium: Electronic Resource
    URL: http://www.bepress.com/ijeeps/vol8/iss2/art6
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    IMF effects on short-period fluctuations at low latitudes (1978)
    [s.l.] : Nature Publishing Group
    Nature 272 (1978), S. 517-518 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] As the variations in the equatorial region are highly time-dependent, pairs of low-latitude and equatorial stations have been chosen for analysis from widely separated longitudinal zones-American zone (Huancayo, Fuquene), African zone (16DIR, lat. 9.6N, long. 41.87?, dip. lat. 0.20, a temporary ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/272517a0
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    High-resolution diffuse X-ray scattering study from nearly perfect silicon single crystals (1979)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 35 (1979), S. 286-295 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: High-resolution measurements of diffuse X-ray scattering (DXS) have been made at and above room temperature around 111, 333, 444 and 555 reciprocal lattice points (relps) using highly collimated Mo Kα1 and Cu Kα1 radiations with the specimen set in (1, -1, 1) symmetrical Bragg geometry. The distribution of DXS intensity around different relps has shown that at temperatures up to at least 573 K the contribution of thermal DXS to the observed DXS is very small. This is apparently due to the high value of the Debye temperature (640 K) of silicon. A remarkable feature of these results is that for the same value of the scattering vector |K*| the DXS intensity is different for the parallel and antiparallel orientations of K* relative to R*. The amount of anisotropy varied from sample to sample and depended on the thermal history of the specimen. This and the other features show that the observed DXS is predominantly due to point defects and their aggregates. A typical size parameter for the aggregates is 3000 to 10 000 Å.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0567739479000607
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    Paper (German National Licenses)
    Fulltext
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