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IEEE Transactions on Industry Applications

Issue 2 • Date Mar/Apr 1993

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Displaying Results 1 - 25 of 30
  • Dielectrophoretic measurement of bacterial motor characteristics

    Publication Year: 1993, Page(s):286 - 294
    Cited by:  Papers (6)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (824 KB)

    Two methods of measuring bacterial motor characteristics using AC field effects in a microfabricated electrode system are presented. One is the measurement of the external force-velocity characteristics (F-v) of swimming bacteria. Electrostatic orientation of bacteria parallel to the field lines is used to guide the bacterial locomotion along a line. Dielectrophoresis is used to apply an external ... View full abstract»

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  • Single-ended soft-switching electronic ballast with unity power factor

    Publication Year: 1993, Page(s):382 - 388
    Cited by:  Papers (45)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (472 KB)

    A soft-switching single-ended AC/AC converter that is suitable for a high-frequency electronic lamp ballast is described. In spite of its simplicity, the converter offers excellent performance with regard to load and supply, ensuring high-frequency supply to the lamp, sinusoidal and in-phase supply current, easy control of lamp power, and high efficiency due to soft switching at both turn-on and t... View full abstract»

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  • Effect of moisture on the dielectrophoretic spectra of glass spheres

    Publication Year: 1993, Page(s):281 - 285
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (440 KB)

    Variable-frequency measurements (from 10 to 105 Hz) on individual glass particles (~50 μm diameter) were performed, using an automated computer-controlled dielectrophoretic levitator. The particles were suspended in silicone oil after either of two treatments: long-term exposure to a water-saturated atmosphere, or drying in a low temperature oven (~250°C). The moisture treatment ... View full abstract»

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  • Design considerations for high-frequency coaxial winding power transformers

    Publication Year: 1993, Page(s):375 - 381
    Cited by:  Papers (22)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (636 KB)

    The use of coaxial windings to create low-loss, low-leakage-reactance, power transformers for use in high-frequency soft-switched DC/DC and resonant converters has been demonstrated by M.H. Kheraluwalest al. (1990). Some of the important loss aspects of the design of coaxial winding transformers are examined, including the influence of the skin effect on winding resistance, the variation of core l... View full abstract»

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  • A universal systems model incorporating electrical, magnetic, and biological relationships

    Publication Year: 1993, Page(s):436 - 446
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (916 KB)

    Biological effects from electromagnetics are discussed. The leading interactions are summarized, and an electrical model is presented. The model explains the biological interactions in electrical terms. Methods of mitigating the effect of power systems on biological systems are noted. An appendix provides an comprehensive mathematical development of a universal systems model View full abstract»

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  • Calculation of corona onset voltage for duct-type precipitators

    Publication Year: 1993, Page(s):274 - 280
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (488 KB)

    A pure theoretical method for calculating the onset voltage of corona in duct-type electrostatic precipitators that is independent of the arrangement of discharge wires relative to the collecting plates is described. This method is based on a criterion for self-recurring single electron avalanches in a known electric field distribution in the ionization zone surrounding the discharge wire. The res... View full abstract»

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  • Applying power electronics to residential HVAC-the issues

    Publication Year: 1993, Page(s):300 - 305
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (548 KB)

    Several of the market and application issues bearing on the economics of residential variable speed air conditioners and heat pumps are outlined. Technical details of capacity modulated systems are avoided, along with design issues involving power semiconductors, motor torque and speed control strategies, and integration in silicon for these applications. The author intends to provoke the developm... View full abstract»

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  • Balancing device stresses by fundamental cancellation

    Publication Year: 1993, Page(s):369 - 374
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (344 KB)

    The technique of harmonic cancellation relies on destructive interference of specific Fourier components between two or more similar but phase-displaced waveforms. The components eliminated are traditionally harmonics of the basic operating frequency. However, there is a no inherent reason why the fundamental cannot be eliminated. The intuitively repellent concept can be advantageously employed to... View full abstract»

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  • Resonant snubbers with auxiliary switches

    Publication Year: 1993, Page(s):355 - 362
    Cited by:  Papers (123)  |  Patents (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (596 KB)

    A resonant snubber is described for voltage-source inverters, current-source inverters, and self-commutated frequency changers. The main self-turnoff devices have shunt capacitors directly across them. A temporary parallel path through a small ordinary thyristor and inductance takes over high-stress turn-on duty from the main device in a manner that leaves no energy trapped after switching View full abstract»

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  • Effect of waveform distortion on protective relays

    Publication Year: 1993, Page(s):404 - 411
    Cited by:  Papers (21)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (660 KB)

    The influence of harmonics on protective relays is described theoretically, and the results of laboratory tests are given. Representative relays using various operating principles were tested using fundamental currents and/or voltages, single-frequency inputs that were multiples of the fundamental frequency, realistic combinations of fundamental and harmonics. From the theoretical concepts and exp... View full abstract»

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  • Testing of large motors to API 542 and 546 standards

    Publication Year: 1993, Page(s):427 - 435
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1028 KB)

    The API 541 and 546 standards address the design, testing, and performance of AC induction motors larger than 250 HP and AC synchronous motors larger than 500 HP. A summary of requirements for testing large AC motors to these specifications as well as an overview of the testing facilities and methods necessary to address these requirements are provided. Testing of special-purpose motors requiring ... View full abstract»

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  • On the dielectrophoretic separation of solid particles

    Publication Year: 1993, Page(s):268 - 273
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (436 KB)

    An analysis of an idealized high-gradient dielectrophoretic separator that is simply a metal circular filament placed in a uniform electric field between two parallel plates is presented. The analysis is aimed at determining the spatial distribution of the electric field inside the volume of the separator, so that the dielectrophoretic force on a dielectric particle can be evaluated. The condition... View full abstract»

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  • DSP-based speed adaptive flux observer of induction motor

    Publication Year: 1993, Page(s):344 - 348
    Cited by:  Papers (475)  |  Patents (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (348 KB)

    A method for estimating the rotor flux and speed of an induction motor based on adaptive control theory is presented. The method is applied to a direct field-oriented induction motor control without speed sensors. The influence of the parameter variation on the speed estimation can be removed by the proposed parameter adaptive scheme. The validity of the adaptive flux observer is verified experime... View full abstract»

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  • Numerical modeling for potential relaxation of charged oil in containers

    Publication Year: 1993, Page(s):295 - 299
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (448 KB)

    A numerical model that simulates the relaxation process for surface potential at the surface of a charged oil in a grounded metal vessel is developed. In the model, constant (ohmic) conductivity of the oil is assumed, and a surface conduction mechanism for the dissipation of electric surface charge is introduced. Calculations for a cylindrical vessel of diameter Dt, height ... View full abstract»

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  • A k-step predictive scheme for speed control of diesel driven power plants

    Publication Year: 1993, Page(s):389 - 396
    Cited by:  Papers (18)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (540 KB)

    An adaptive speed control scheme for diesel prime movers is presented. Diesel prime movers are characterized by nonlinear, time-varying parameters including a nonlinear input dead-time variation that introduces an unknown delay between the injection of fuel and the production of engine torque. Such plants are difficult to control by conventional proportional-integral (PI) controllers. It is shown ... View full abstract»

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  • Health effects of extremely low-frequency (50 and 60 Hz) electric and magnetic fields

    Publication Year: 1993, Page(s):447 - 458
    Cited by:  Papers (8)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1180 KB)

    The author provides assistance to the scientific and technical community in putting the subject into perspective while the furor in the media over health effects of low-frequency fields abates. The voltages and currents generated within the human body are detailed. The values of directly applied voltages and currents that occur when a person comes into contact with energized conductors, which are ... View full abstract»

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  • Real-time issues of transputers in high-performance motion control systems

    Publication Year: 1993, Page(s):306 - 312
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (652 KB)

    The real-time issues related to using transputers to implement high-performance AC motor drive controllers because of their direct support for parallel processing are addressed. They include event response time, scheduling strategies, I/O, and real-time kernel performance. The implementation of part of a real-time kernal consisting of a multiple event handler and an efficient scheduler, to improve... View full abstract»

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  • Dynamic equalization during charging of serial energy storage elements

    Publication Year: 1993, Page(s):363 - 368
    Cited by:  Papers (34)  |  Patents (17)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (488 KB)

    A technique is described that equalizes the amount of charge in a serial string of energy-storage cells during charging by using DC-to-DC converters to divert portions of the charging current past selected cells (or groups of cells). When no converters are operating, the charging current through the string is equal to that of the charging source. As the string charges, one cell eventually reaches ... View full abstract»

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  • The semiconductor junction igniter: a novel RF and ESD insensitive electro-explosive device

    Publication Year: 1993, Page(s):412 - 418
    Cited by:  Papers (10)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (576 KB)

    The description and characterization of a monolithic, solid-state electroexplosive device are presented. The structure is inherently immune to radio frequency (RF) radiation and also offers protection from electrostatic discharge (ESD). Interconnection to the device can be accomplished by a variety of techniques, such as soldering, epoxy, etc. Standard microelectronic techniques were utilized for ... View full abstract»

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  • Microprocessor-based arc voltage control for gas tungsten arc welding using gain scheduling

    Publication Year: 1993, Page(s):250 - 255
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (516 KB)

    Limitations of the traditional automatic voltage controller (AVC) for gas tungsten arc welding are explained, and the characteristics of the welding arc that cause these limitations are presented. The design of an adaptive AVC using a microprocessor-based controller is described. The enhanced AVC uses gain scheduling to maintain optimum gain in the feedforward loop of the system and offers a const... View full abstract»

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  • A flux observer for induction machines based on a time-variant discrete model

    Publication Year: 1993, Page(s):349 - 354
    Cited by:  Papers (36)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (464 KB)

    An alternative approach to obtaining a discrete-time counterpart to the two-axis continuous model of an induction machine is presented. The discrete time-variant equations are derived from a partial discretization of the continuous state equation. The discrete model can be used with advantage in simulation and real-time control applications. A discrete time-variant reduced-order flux observer base... View full abstract»

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  • Voltage sags in industrial systems

    Publication Year: 1993, Page(s):397 - 403
    Cited by:  Papers (285)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (560 KB)

    The cause of voltage sags in industrial plants, their impacts on equipment operation, and possible solutions are described. The definition proposed focuses on system faults as the major cause of voltage sags. The sensitivity of different types of industrial equipment, including adjustable speed drive controls, programmable logic controllers, and motor contactors is analyzed. Available methods of p... View full abstract»

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  • An integrated grounding practice for digital systems

    Publication Year: 1993, Page(s):459 - 467
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (836 KB)

    The problems encountered in the design of grounding systems for digital systems to meet both the requirements of the National Electrical Code (NEC) and the equipment manufacturer's site planning manuals and installation instructions are discussed. The authors point out the NEC requirements and the inconsistencies between the NEC and the manufacturer's requirements. An integrated grounding practice... View full abstract»

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  • Quasi-dual modulation of three-phase PWM converters

    Publication Year: 1993, Page(s):313 - 319
    Cited by:  Papers (13)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (508 KB)

    The possibility of transferring the modulation method developed for a pulse width modulated (PWM) power converter with a DC voltage link (VLC) to a PWM converter with a DC current link (CLC) based on the inverse current and voltage behavior of these two systems is evaluated. The duality between VLC and CLC, which has been intuitively clear, is treated here in a scientific approach. It is shown tha... View full abstract»

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  • Shaft voltages and rotating machinery

    Publication Year: 1993, Page(s):419 - 426
    Cited by:  Papers (47)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1024 KB)

    In order to determine whether a machine is experiencing shaft voltage and current problems, recognition of the four types of damage is imperative. The four distinct types of shaft current damage, frosting, spark tracks, pitting, and welding are described. The four shaft voltage sources and their means of generation are discussed in detail. Methods for correction and/or elimination of these sources... View full abstract»

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Aims & Scope

The scope of the IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS includes all scope items of the IEEE Industry Applications Society, that is, the advancement of the theory and practice of electrical and electronic engineering in the development, design, manufacture, and application of electrical systems, apparatus, devices, and controls to the processes and equipment of industry and commerce; the promotion of safe, reliable, and economic installations; industry leadership in energy conservation and environmental, health, and safety issues; the creation of voluntary engineering standards and recommended practices; and the professional development of its membership.

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Editor-in-Chief
Thomas A. Nondahl
t.nondahl@ieee.org