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IEEE Transactions on Industry Applications

Issue 5 • Date Sep/Oct 1990

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Displaying Results 1 - 24 of 24
  • Selection criteria for SAG mill drive systems

    Publication Year: 1990, Page(s):901 - 908
    Cited by:  Papers (8)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (740 KB)

    The various options available for large-horsepower semiautogenous grinding (SAG) mill drive systems are examined, together with their impacts on mill design and relative capital and operational costs. A brief history of large-mill drive systems is given. State-of-the-art mill design and mechanical design considerations are also discussed. A design for fixed-speed or variable-speed operation is pre... View full abstract»

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  • The application of 2400 V to longwall face equipment

    Publication Year: 1990, Page(s):886 - 892
    Cited by:  Papers (15)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (720 KB)

    Operational and safety aspects of 2400 V longwall mining systems, as compared with 995 V systems, are presented. A 900 ft face width was chosen for the comparison, and typical longwall equipment, power requirements, and cable lengths were selected. The kilovoltampere rating of the power-center transformer was specified as 2500 kVA, with a 0.05 pu impedance and a resistance-to-reactance ratio of 4.... View full abstract»

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  • Recent advances in insulated gate bipolar transistor technology

    Publication Year: 1990, Page(s):831 - 834
    Cited by:  Papers (6)  |  Patents (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (368 KB)

    Device design of the insulated gate bipolar transistor (IGBT) has been optimized to reduce the distributed transmission-line effect. In addition, cell geometry is chosen to yield high latchup current capability and low forward-voltage drop simultaneously. The vertical structure is optimized to enhance both the turn-off speed and the safe operating area of the IGBTs. The turn-off time of the n-IGBT... View full abstract»

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  • Lightning protection for microprocessor-based electronic systems

    Publication Year: 1990, Page(s):947 - 953
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (568 KB)

    The issues of lightning threats, suppressor components, and guidelines for selection and placement of protectors are addressed. Case histories are also reviewed. It is noted that current complex, multifunctional electronic systems are composed mainly of sophisticated microcircuits that are extremely vulnerable to lightning-caused transient voltage spikes. Properly selected and installed surge prot... View full abstract»

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  • Simulation of pipeline holiday detection by time domain reflectometry

    Publication Year: 1990, Page(s):961 - 966
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (464 KB)

    An analytical electrical transmission line model for an isolated buried pipeline is developed. Elements of the transmission-line model are derived mathematically using both field and circuit theory methods. Propagation along the coated pipeline in multilayer earth is studied analytically and modeled with a computer. The performance of the transmission line is analyzed. It is shown that time-domain... View full abstract»

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  • Artificial neural networks applied to arc welding process modeling and control

    Publication Year: 1990, Page(s):824 - 830
    Cited by:  Papers (76)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (692 KB)

    Artificial neural networks have been studied to determine their applicability to modeling and control of physical processes. Some basic concepts relating to neural networks and how they can be used to model weld-bead geometry in terms of the equipment parameters selected to produce the weld are explained. Approaches to utilizing neural networks in process control are discussed. The need for modeli... View full abstract»

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  • Harmonic field analysis for slip-ring motors including general rotor asymmetry

    Publication Year: 1990, Page(s):857 - 865
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (584 KB)

    A field analysis is presented for slip-ring induction motors with general external impedance asymmetry. The method is based upon a rotating-field theory approach including spatial MMF (magnetomotive force) harmonics. It is shown that a series of nonmains frequency voltages are induced in the stator winding for both balanced and unbalanced rotors. The method is also used to derive the harmonic equi... View full abstract»

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  • An advanced interruption method for low-voltage medium-capacity air-break contactors

    Publication Year: 1990, Page(s):818 - 823
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (596 KB)

    An advanced interruption method with a unique arc-extinguishing plate has been developed on the basis of a study concerning arc extinction of various electrodes in air. The arc-extinguishing plate has a U-shaped portion that projects toward a contact gap. This arrangement markedly reduces the arcing time and contact wear. The short arcing time is revealed by an electric field analysis for various ... View full abstract»

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  • Effect of harmonics on power measurement

    Publication Year: 1990, Page(s):944 - 946
    Cited by:  Papers (6)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (200 KB)

    Energy (kWh) measurement has become critically important in determining industrial power flow. With the proliferation of nonlinear loads, there are significant amounts of harmonics in the power distribution system. The effects of nonlinear loads on devices such as circuit breakers have been studied in detail. A review of three-phase power (kW) metering is given, and the effects of harmonics on pow... View full abstract»

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  • An electronic method of controlling multiple reignition switching transients in vacuum contactors

    Publication Year: 1990, Page(s):893 - 900
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (780 KB)

    An electronic method is described for controlling the contact tip opening of a vacuum contactor in such a way that the probability of transient overvoltages caused by multiple reignitions during load switching is minimized. The multiple reignition transient problem is described, and the electronic hardware utilized to control the vacuum contactor is discussed. Tests of the effectiveness of the sys... View full abstract»

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  • Preservation of large motors and generators from weather on offshore platforms

    Publication Year: 1990, Page(s):914 - 918
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (684 KB)

    The problems encountered with moisture condensation in the bearing cavities and internal windings of large motors and generators when proper equipment storage procedures are not practiced are outlined. The moisture condensation problems associated with the operation and shutdown of large motors and generators due to weather conditions at the site location of the offshore platforms are also discuss... View full abstract»

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  • The reverse blocking GTO as a very fast turn-off thyristor

    Publication Year: 1990, Page(s):840 - 847
    Cited by:  Papers (13)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (596 KB)

    The high-frequency operation of GTO's (gate turn-off thyristors) in parallel inverters with resonant load for induction heating is investigated. The load-forced turn-off process of devices with reverse-blocking capability is analyzed on the basis of experimental results. The behavior of anode and gate voltages and currents during turn-off and during reapplication of forward voltage is analyzed con... View full abstract»

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  • Unsteady and steady flow control on pumping systems

    Publication Year: 1990, Page(s):954 - 960
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (532 KB)

    The possibility of reducing the severity of pressure transients produced during the starting and stopping of pumps by means of a gradual variation of the rotational speed of the pump driver is shown. Efficient regulation of the discharge supplied by the pump is also possible by varying the rotational speed instead of throttling. Both problems require knowing how to vary the speed; a simple PID (pr... View full abstract»

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  • 2.5 kV 2000-A monolithic reverse conducting gate turn-off thyristor

    Publication Year: 1990, Page(s):835 - 839
    Cited by:  Papers (2)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (440 KB)

    A 2.5 kV 2000 A monolithic reverse-conducting gate turn-off thyristor (RC-GTO) has been developed using a precise lifetime control technique, a precise gate etching control technique, and an electrical separation technique between the GTO part and the diode part. It is most important for the RC-GTO to separate electrically the GTO part from the diode part. A very high separation resistance of 100-... View full abstract»

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  • Automation of reciprocating gas engine compressor packages using programmable logic controllers

    Publication Year: 1990, Page(s):909 - 913
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (444 KB)

    An approach taken to automate gas engine/compressor skid-mounted packages is described. The approach includes design criteria with special considerations regarding the application of programmable logic controllers (PLCs). Using typical industry-standard specifications along with I/O (input/output) lists, sequence narratives, and logic diagrams, the PLCs may be programmed to perform the desired ope... View full abstract»

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  • Bus transfer of AC induction motors: a perspective

    Publication Year: 1990, Page(s):935 - 943
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (792 KB)

    An attempt is made to put the problem of bus transfer of induction motors into perspective by presenting, in general terms, the overall concerns and the methods of analysis recently developed. It is pointed out that a decision to transfer one or more induction motors from one power source to another is a difficult one to make. It is complicated by the conditions under which it must be made, whethe... View full abstract»

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  • Field experience with high-frequency ballasts

    Publication Year: 1990, Page(s):810 - 811
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (172 KB)

    The Energy Conservation Office of the University of California at Berkeley has installed over 35000 high-frequency ballasts, produced by three manufacturers, in the period from 1986 to the present. The quantities of defective ballasts that are returned to manufacturers for replacement are used to estimate the failure rate of these ballasts under field conditions. It is concluded that careful selec... View full abstract»

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  • Fast-acting, long-stroke solenoids with two springs

    Publication Year: 1990, Page(s):848 - 856
    Cited by:  Papers (29)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (652 KB)

    It is pointed out that fast motion over a long stroke cannot be achieved with regular solenoids when the active force decreases rapidly with distance. A possible solution, a device with two oscillating springs controlled electromagnetically, is theoretically and experimentally studied. The mathematical model, based on finite-element analysis, consists of a dynamic model of motion that includes all... View full abstract»

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  • Expansion of operating limits for permanent magnet motor by current vector control considering inverter capacity

    Publication Year: 1990, Page(s):866 - 871
    Cited by:  Papers (306)  |  Patents (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (444 KB)

    The current vector control method of PM (permanent magnet) motors is examined to expand the operating limits associated with inverter capacity. This control method is optimum in the sense of deriving maximum output torque within the voltage and current constraints. The effects of motor parameters are examined by computer simulation. The operating limits are greatly expanded by controlling the ... View full abstract»

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  • Motor design slip performance on cyclic loads

    Publication Year: 1990, Page(s):919 - 925
    Cited by:  Papers (1)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (480 KB)

    Cyclic loads such as eccentric pumping units cause a varying torque on the driver. Determination of the most efficient induction motor for the load is discussed. Ultrahigh-slip motors as well as NEMA (National Electric Manufacturers Association) design motors are evaluated. Comparisons of operating costs and investments are presented. The following is concluded: (1) any motor design will work on a... View full abstract»

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  • The nondestructive measurement of the charge-to-mass ratio of an insulating tone layer present on a photoconductor

    Publication Year: 1990, Page(s):812 - 817
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (444 KB)

    Nondestructively measuring the charge present in a toner layer based upon a noncontacting measurement of the potential across the layer and the solution of Poisson's equation for the toner layer is addressed. The former is easily accomplished using commercially available electrostatic voltmeters. The latter requires detailed knowledge of the toner layer morphology. Solid-area continuous-tone image... View full abstract»

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  • Digital measurements of the efficiency of inverter-induction machines

    Publication Year: 1990, Page(s):872 - 879
    Cited by:  Papers (13)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (624 KB)

    The authors describe a digital technique and the required instrumentation to measure the electric power output into inverter-induction machine drives, where the voltage and current signals are nonsinusoidal. The voltage and current signals representing the electrical power input into the motor are stored in a suitable storage oscilloscope with built-in computing capability. The power input is calc... View full abstract»

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  • Estimating busbar temperatures

    Publication Year: 1990, Page(s):926 - 934
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (536 KB)

    A tutorial on calculating the temperature of naturally and liquid-cooled DC buses is presented. Estimation of time constants allows calculations of time-varying bus temperatures, while the determination of span constants is helpful in calculating heating gradients along busbars. Sample calculations are included. The methods shown allow the estimation of the steady-state temperature within about 5&... View full abstract»

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  • A PWM AC-to-DC converter with fixed switching frequency

    Publication Year: 1990, Page(s):880 - 885
    Cited by:  Papers (227)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (420 KB)

    For a PWM (pulse-width modulated) AC-to-DC power converter, a predicted current-control strategy with fixed switching frequency (PCFF control) is proposed. Its principle and implementation are described, and experimental results are provided showing that the converter under PCFF control has bidirectional power-transmission ability with high dynamic performance. The line currents are close to sinus... 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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Meet Our Editors

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