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Industry Applications, IEEE Transactions on

Issue 6 • Date Nov. 1987

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Displaying Results 1 - 25 of 36
  • Table of contents

    Publication Year: 1987 , Page(s): c1 - 958
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  • IEEE Industry Applications Society

    Publication Year: 1987 , Page(s): c2
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  • IAS Paper Awards

    Publication Year: 1987 , Page(s): 959 - 960
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  • IEEE Industry Applications Society Electric Machines Committee: A "New'' Committee in an "Old'' Discipline [Guest Feature]

    Publication Year: 1987 , Page(s): 961 - 962
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  • Foreword

    Publication Year: 1987 , Page(s): 963
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  • Future Electric Supply and Demand: An Overview

    Publication Year: 1987 , Page(s): 964 - 969
    Cited by:  Papers (1)
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    The future electric supply and demand picture is marked by uncertainty. Forecasts now assume electric demands will be reduced by load management, conservation, and customer-owned generation. Will they be right? Could demand growth outstrip available supply? What must be done to protect the reliability of our vitally important electric supply? View full abstract»

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  • Electrical Properties of Conductive Two-Component Xerographic Developer

    Publication Year: 1987 , Page(s): 970 - 974
    Cited by:  Papers (2)
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    Xerographic development with a conductive two-component magnetic brush depends on the electrical properties of a developer mixture consisting of insulative toner particles and conductive carrier beads. The electric field driving toner deposition onto an image receiver is affected by the carrier bead conductivity, toner concentration, magnetic field strength, developer thickness, and developer agitation due to the relative motion between the developer and image receiver. To elucidate the dependence of the electrical properties on these parameters, the measurements on an electroded cell of developer under conditions simulating magnetic brush development systems are described. The measurements provide insight into the solid area and line development process with conductive xerographic developer. View full abstract»

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  • Large Charged Drop Levitation Against Gravity

    Publication Year: 1987 , Page(s): 975 - 979
    Cited by:  Papers (7)
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    A hybrid electrostatic-acoustic levitator that can levitate and manipulate a large liquid drop in one gravity is presented. To the authors' knowledge, this is the first time such large drops (up to 4 mm in diameter in the case of water) have been levitated against 1-gravity. This makes possible, for the first time, many new experiments both in space and in ground-based laboratories, such as 1) supercooling and superheating, 2) containerless crystal growth from various salt solutions or melts, 3) drop dynamics of oscillating or rotating liquid drops, 4) drop evaporation and Rayleigh bursting, and 5) containerless material processing in space. The digital control system, liquid drop launch process, principles of electrode design, and design of a multipurpose room temperature levitation chamber are described. Preliminary results that demonstrate drop oscillation and rotation, and crystal growth from supersaturated salt solutions are presented. View full abstract»

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  • Dielectrophoretic Levitation of Small Metallic Particles

    Publication Year: 1987 , Page(s): 980 - 983
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    Small uncharged metallic spheres have been levitated in a nonuniform electric field using a microprocessor-based active feedback control system. The particle is centered horizontally in an axisymmetric time-varying electric field. The vertical gravitational force is balanced by the dielectrophoretic force; however, the resulting equilibrium is unstable. To achieve stable levitation the vertical particle position is sensed optically and an error voltage is applied to the electrodes. Experimental results with the levitator are in good agreement with the equilibrium force balance model. View full abstract»

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  • Monopolar Corona on Bundle Wires as Influenced by Wind

    Publication Year: 1987 , Page(s): 984 - 989
    Cited by:  Papers (10)
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    The measured corona current contributed by each subwire in various laboratory-size bundle models and the total corona current change with wind over a wide range of applied voltages are described. The lateral spacial distribution of the time-average value of windblown corona current over the ground plate is measured for different applied voltages and different bundle geometries. The obtained results are compared to previous findings and to theories of corona discharge. View full abstract»

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  • Positive Corona and Atmospheric Negative Ion Density under Repetitive Impulse Conditions

    Publication Year: 1987 , Page(s): 990 - 994
    Cited by:  Papers (2)
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    The variations in the negative ion density in the atmosphere around an electrode gap in which positive corona is produced during repetitive voltage impulses is discussed. A set of equations is solved numerically for the time variation of negative ion density; the influence of positive and negative, small and large ions is included, together with the natural rate of production of ions in the atmosphere. The results show that in repetitive testing the background density of negative ions is always lower than the natural density, and that it is higher in humid air than in dry air. View full abstract»

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  • Performance Optimization of Induction Motor-Pump System Using Photovoltaic Energy Source

    Publication Year: 1987 , Page(s): 995 - 1000
    Cited by:  Papers (26)  |  Patents (1)
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    The optimization of a photovoltaic pumping system based on an induction motor driven pump that is powered by a solar array is presented in this paper. The motor-pump subsystem is analyzed from the point of view of optimizing the power requirement of the induction motor, which has led to an optimum u-f relationship useful in controlling the motor. The complete pumping system is implemented using a dc-dc converter, a three-phase inverter, and an induction motor-pump set. The dc-dc converter is used as a power conditioner and its duty cycle is controlled so as to match the load to the array. A microprocessor-based controller is used to carry out the load-matching. View full abstract»

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  • Highly Dynamic Four-Quadrant AC Motor Drive with Improved Power Factor and On-Line Optimized Pulse Pattern with PROMC

    Publication Year: 1987 , Page(s): 1001 - 1009
    Cited by:  Papers (26)  |  Patents (6)
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    The power factor and the waveforms of the currents of voltage source inverters can be improved essentially when two-pulse inverters are used¿one at the line side and the other at the machine side. Both inverters are controlled by similar current vector controllers. The reference value of the stator current can be calculated by field-oriented control or by decoupling, for example. The reference value of the line current is derived from the actual state of the mains and the machine. Furthermore, on-line optimization of the pulse pattern by programmable read-only memory control (PROMC) is used. View full abstract»

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  • High-Speed Drive System with Ultrasonic MOSFET PWM Inverter and Single-Chip Microprocessor Control

    Publication Year: 1987 , Page(s): 1010 - 1015
    Cited by:  Papers (74)
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    The design of high-current high-voltage MOSFET inverters requires measures to reduce the switching losses of the flyback diodes. Saturable reactances have been used in the case of a 4.5-kVA MOSFET inverter to limit the di/dt during commutations. The switching overvoltages of the reactances are absorbed by one common clamping circuit per bridge leg. The drive control system and the space vector modulator for the generation of the PWM switching sequences are implemented in a single-chip microcomputer. View full abstract»

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  • Design of a Pulsewidth-Modulated Resonant Converter for a High-Output-Voltage Power Supply

    Publication Year: 1987 , Page(s): 1016 - 1021
    Cited by:  Papers (9)
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    The design and fabrication of a parallel resonant converter circuit and a high-frequency step-up transformer used to supply an adjustable dc voltage to a load is described. The 500-W system is operated from 115/230 V single-phase 60-Hz power, which is rectified and filtered to form a 310-V dc link. A two-transistor half-bridge circuit operating at a fixed frequency above the circuits resonant frequency converts the dc voltage to an ac voltage at approximately 20 kHz. This high-frequency voltage is transformed with a low-capacitance oil-impregnated ferrite transformer. The output voltage is rectified to form a dc voltage with a maximum value of 90-kV peak. The output voltage is adjustable using pulsewidth modulation of the conduction time of the two transistors in the power circuit. The energy stored in the resonant circuit provides a sinusoidal transformer voltage at fixed frequency over a wide range of control. The system is provided with a closed-loop peak-voltage regulator and an on-off capability from the control electronics. The transformer is designed for a specific value of inductance and capacitance to operate at the desired resonant frequency and characteristic impedance. View full abstract»

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  • Characteristics of a Controlled-Current PWM Rectifier-Inverter Link

    Publication Year: 1987 , Page(s): 1022 - 1028
    Cited by:  Papers (65)  |  Patents (6)
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    Two controlled-current pulsewidth-modulated (PWM) converters have been integrated into rectifier-inverter links of variable-speed ac motor drives. The authors focus on developing a mathematical model of the rectifier-inverter link and presenting experimental justification of the model. The characteristics of the rectifier-inverter system and the constraints imposed by the voltage feedback loop and dc link voltage are discussed. The rectifier-inverter system is made to drive a "selfcontrolled" synchronous motor, thus forming a system for which both the utility and the motor currents are near sinusoidal. The optimized power conversion capability of the motor is now matched by unity power factor operation on the rectifier side. Fast reversal from motoring to regenerative braking capability is demonstrated experimentally. View full abstract»

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  • A Graphical Approach to AC Drive Classification

    Publication Year: 1987 , Page(s): 1029 - 1035
    Cited by:  Papers (5)  |  Patents (2)
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    A classification of ac drive technology is presented. A series of diagrams show how the various types of ac drives have evolved into families that meet various application requirements. The objective is to provide a convenient graphical format from which suitable drive types for classes of applications are readily apparent. The diagrams are organized around the input and output power circuit topology with the type of semiconductor power switch as the primary classification element. All other drive properties, such as motor type, control strategy, power level, voltage level, and regeneration capability, are incorporated by segmenting and highlighting portions of the basic diagrams. A discussion of drive properties is also presented and integrated with the graphical presentations. View full abstract»

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  • A Vector-Controlled Cycloconverter Drive for an Icebreaker

    Publication Year: 1987 , Page(s): 1036 - 1042
    Cited by:  Papers (28)
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    A high-power high-performance variable-speed drive system using a cycloconverter-fed synchronous motor is described. The control uses the field-orientation principle to give the drive system good steady-state and dynamic performance criteria. The accuracy of the field orientation is improved with the use of current regulators operating in the airgap flux reference frame. The system was manufactured to deliver 16 000 hp to the twin propeller shafts of a Canadian Coast Guard icebreaker. The electric components of the system were tested as a unit in the factory and the desired system performance was achieved. View full abstract»

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  • DC Link Current Control for High-Performance CSIM Drives

    Publication Year: 1987 , Page(s): 1043 - 1047
    Cited by:  Papers (12)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1828 KB)  

    A novel scheme is formulated to control the dc link current of a current source inverter induction motor (CSIM) drive which greatly enhances the current response with substantial benefits on the overall dynamic performance of the drive. In addition to conventional closed-loop control with a PI regulator, the novel scheme incorporates a function generator to compensate for the motor back-EMF seen by the dc link. Application of this scheme to an indirect field-oriented CSIM drive is presented, and improvement in the drive performance is documented. View full abstract»

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  • Efficient Operation of Surface-Mounted PM Synchronous Motors

    Publication Year: 1987 , Page(s): 1048 - 1054
    Cited by:  Papers (24)
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    The steady-state performance of the surface magnet PM synchronous motor can be modeled to a good approximation by a simple equivalent circuit that includes the effect of the stator core loss. For operation at constant power with no restrictions placed on voltage or frequency, this model shows that there exists a unique operating point that yields the maximum efficiency and that the efficiency at this point is a function solely of the motor loss parameters, independent of the particular power level. Loss contour plots are introduced to show the existence of the optimum point and to show the nature of the losses as one departs from the optimum. The impact of these results on different operating modes for the machine is discussed. Test results are presented to verify that the optimal efficiency point exists and that the simple model predicts the machine performance reasonably well. View full abstract»

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  • A Method for Compensation of Variable Commutation Delay in Current Source Inverters

    Publication Year: 1987 , Page(s): 1055 - 1060
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    The autosequentially commutated current-fed inverter (ASCI) is widely used due to its simplicity, ruggedness, and inherent regeneration capability. It can be readily equipped with a field-oriented controller. However, the variable recharge time during commutation causes a displacement in the position of the MMF as inferred from the commutation state of the output thyristors. Therefore an error in torque angle occurs for sudden changes in torque command. The details of this problem are described quantitatively. A compensation strategy is proposed, and a circuit implementation is shown. Experimental results are included to demonstrate the effectiveness of the technique. It is concluded that this phenomenon must be taken into account for optimum performance of the drive. View full abstract»

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  • Correction to ``Robust Control of a CSI-Fed Induction Motor Drive System''

    Publication Year: 1987 , Page(s): 1060
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  • Fiberoptic Applications in Pipes and Pipelines

    Publication Year: 1987 , Page(s): 1061 - 1066
    Cited by:  Papers (2)
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    The advent of fiberoptic technologies has provided the communication and instrumentation worlds with a new tool. Fiberoptics offer high noise immunity, large bandwidth, and interesting sensor properties. The uses of fibers span from the telecommunications area, to the futuristic medical and ``Star Wars'' applications, to monitoring heat tracing on pipelines. A number of interesting and potentially useful applications of fiberoptics have been made to the area of pipes and pipelines. A summary of the basics of fiberoptics needed to understand applications in pipes and pipelines is provided. Communications, sensors, and unique applications are examined. Available literature related to the specific applications where fiberoptics are used in pipes and pipelines is referenced. Each example provides a new application of what promises to be a major technology of the 21st century. The understanding of fiberoptics today gives tomorrow's engineer a glimpse at tomorrow's monitoring, metering, and communication systems. A broad overview of these applications and an extensive referencing for further investigation is provided to give the interested engineer a good source document to start the study of fiberoptics for pipeline applications. View full abstract»

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  • Power System Balancers for an Induction Generator

    Publication Year: 1987 , Page(s): 1067 - 1072
    Cited by:  Papers (10)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1997 KB)  

    All power systems operate with some level of unbalance. A model for designing power balancers is presented. Induction generators are being used more extensively than in the past because of economics. Their use and a model are presented. Calculations and experimental data are used to demonstrate the feasibility of operating three-phase induction generators into a single-phase power system. View full abstract»

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  • Choosing a SCADA System with the Operator in Mind

    Publication Year: 1987 , Page(s): 1073 - 1076
    Cited by:  Papers (4)
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    Scan and data acquisition (SCADA) hardware and software are constantly changing. Because of these changes the SCADA keyboards, displays, and response time of today differ from the equipment performance of yesterday, and the equipment of the future will differ from the equipment of today. A review of pipeline control changes over the past 35 years is used to demonstrate how the equipment has served the operator. A brief discussion of new hardware developments shows how past experience might be applicable when designing SCADA systems in the future. 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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Carlton E. Speck