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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Electrical engineering 74 (1990), S. 69-77 
    ISSN: 1432-0487
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Description / Table of Contents: Übersicht Dieser Artikel beschreibt ein vollständiges digitales Steuerungssystem für Standard-Induktionsmotoren. Ein neues Wechselrichter-Spannungsvektor-Steuerungssystem für Hochfrequenzschaltung und ein prädiktives Frequenz-Spannungs-Steuerungssystem, das den Bedarf von Tacho-Rückmeldung eliminiert, ist entwickelt worden. Außerdem wurde ein selbsteinstellendes Parameteranpassungsverfahren entwickelt. Dieses Verfahren nimmt Rücksicht auf die große Variation der elektrischen Parameter verschiedener Fabrikate von Standard-Induktionsmotoren. Für Überwachungszwecke sind Schaltschutz, Minimierung des Schaltverlustes und anwendungsspezifische integrierte Schaltungen vielfach benutzt worden. Die stationären und dynamischen Verhältnisse der Antriebe werden dokumentiert und durch Simulationen verglichen.
    Notes: Contents This paper describes a completely digital control system for standard induction motors. A new inverter voltage vector control system for high frequency switching has been designed, and a predictive frequency-voltage control system that eliminates the need of tacho feedback has been developed. In addition, an adaptive parameter tuning method has been developed. This method takes the large variation in electrical parameters of standard induction motors of different manufactures into account. For control purposes, switch protection and switch loss minimizing, custom designed application specific integrated circuits have been used extensively. Steady-state and dynamic performances of the drive are documented and compared to simulations.
    Type of Medium: Electronic Resource
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  • 2
    Publication Date: 2012-02-09
    Description: During a close pass of Cassini through the plasma wake of Saturn's moon Dione on April 7, 2010 the Cassini Plasma Spectrometer (CAPS) detected molecular oxygen ions (O2+) on pick up ring velocity distributions, thus providing the first in situ detection of a neutral exosphere surrounding the icy moon. The density of O2+ determined from the CAPS data ranges from 0.01 to 0.09 /cm3 and is used to estimate the exosphere O2 radial column density, obtaining the range 0.9 to 7 × 1011/cm2 . CAPS was unable to directly detect pick up H2O+ from the exosphere but the observations can be used to set an upper limit to their density of ∼10 times the O2+ density.
    Print ISSN: 0094-8276
    Electronic ISSN: 1944-8007
    Topics: Geosciences , Physics
    Published by Wiley on behalf of American Geophysical Union (AGU).
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  • 3
    Publication Date: 1990-01-01
    Print ISSN: 0948-7921
    Electronic ISSN: 1432-0487
    Topics: Electrical Engineering, Measurement and Control Technology
    Published by Springer
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