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IEEE Industry Applications Magazine

Issue 4 • Date July-Aug. 1999

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Displaying Results 1 - 8 of 8
  • Charles A. Ruch 1915-1998 Westinghouse Electric Communicator, Historian, Curator

    Publication Year: 1999, Page(s):9 - 11
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    Freely Available from IEEE
  • Errata [Better interpritation of vacumm interrupter tests]

    Publication Year: 1999, Page(s): 8
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (117 KB)

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  • IGCT-a new emerging technology for high power, low cost inverters

    Publication Year: 1999, Page(s):12 - 18
    Cited by:  Papers (70)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1148 KB)

    The integrated gate commutated thyristor (IGCT) includes all the important innovations needed for future power electronic applications. The IGCT is an important contribution to high power electronics. It will be the key component for future medium to high-voltage applications from 0.5 MVA up to several 100 MVA. It inherently enables simple and robust series connection of high power turn-off device... View full abstract»

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  • Minimizing electric bearing currents in ASD systems

    Publication Year: 1999, Page(s):55 - 66
    Cited by:  Papers (74)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1228 KB)

    During recent years, an increase in bearing failures has been seen in ASD-fed electric motors, as well as in gearboxes, and other connected machinery, caused by electric current flow through such bearings. The theories presented in this paper focus on bearing currents in ASDs of the voltage source pulse width modulated (PWM) type, for use with AC induction motors, although the concepts are applica... View full abstract»

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  • Using corona inception voltage for motor evaluation

    Publication Year: 1999, Page(s):48 - 54
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1020 KB)

    Failures of the interturn insulation system of induction motors fed by PWM variable speed controllers have plagued the industry since the introduction of fast-switching, IGBT-based drives. The majority of these failures are attributed to high voltage stresses imposed upon the motor by the drive. Here, the author describes how the corona inception voltage can be used for evaluating the state of var... View full abstract»

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  • PWM drive related bearing failures

    Publication Year: 1999, Page(s):41 - 47
    Cited by:  Papers (25)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1056 KB)

    The phenomenon of motor shaft voltages producing circulating shaft currents has been recognized since the 1920s. When a motor is operated by sinusoidal power, shaft voltages are caused by alternating flux linkages with the shaft. This article investigates the phenomenon of induced shaft voltages caused by PWM AC variable speed drives and discusses methods of mitigating their harmful effects View full abstract»

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  • Near unity input displacement factor for current source PWM drives

    Publication Year: 1999, Page(s):19 - 25
    Cited by:  Papers (19)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (744 KB)

    A simple control scheme for near unity input displacement factor (IDF) operation of the three phase current source type PWM rectifier is proposed. The rectifier is operated by a conventional selective harmonic elimination pattern with 420 Hz switching frequency, which is feasible for GTO switches used in high power applications. The article includes a description of the proposed control scheme, ID... View full abstract»

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  • NEMA Design E motors and controls. What's it all about?

    Publication Year: 1999, Page(s):26 - 40
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1184 KB)

    The purpose of this paper is to present the performance differences between NEMA Design B and NEMA Design E motors and the impact that this may have on the control, protection and application of the motor. It is shown that, while the NEMA Design E motor may be a physical equivalent of a NEMA Design B motor, the differences in performance may require changes in control and protection equipment View full abstract»

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IEEE Industry Applications Magazine publishes articles concerning technical subjects and professional activities that are within the Scope of the IEEE Industry Applications Society (IAS) and are of interest to society members

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H. Landis "Lanny" Floyd
 

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