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Industrial Electronics, IEEE Transactions on

Issue 3 • Date Aug. 1985

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Displaying Results 1 - 23 of 23
  • Table of contents

    Page(s): c1
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  • IEEE Industrial Electronics Society

    Page(s): c2
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  • Traffic Monitoring and Control Using Machine Vision: A Survey

    Page(s): 177 - 185
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    The large increase in traffic density during the last 25 years in the US, Europe, and Japan has required the automation of some functions of traffic control and monitoring. Buried magnetic loops are widely used for this purpose, but there are functions such as incident detection, vehicle tracking, etc., which are not implementable with them. In addition, magnetic loops are not flexible. Image processing represents a potentially much more powerful tool for this application. Its main disadvantage is the high initial cost. Research in the area of machine vision for traffic monitoring and control is being actively pursued in several countries. This paper surveys current efforts. View full abstract»

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  • Microprocessor Control of DC/AC Static Converters

    Page(s): 186 - 191
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    Microprocessor control of power electronic systems offers the possibility of improvements in reliability, maintenance and servicing, and increased control flexibility. This paper describes several pulsewidth modulation (PWM) waveforms where a predetermined number of unwanted harmonics can be canceled. The advantages and disadvantages of the different methods of delaying the signals in small microprocessor controlled PWM inverter drive systems are considered. Several examples of single-phase and three-phase PWM inverters, with the laws which govern the commutation angles, output waveforms, and their respective frequency spectra are presented. View full abstract»

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  • Analysis and Performance of Three-Phase Phase-Controlled Thyristor AC Voltage Controllers

    Page(s): 192 - 199
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    A simple generalized approach, based on numerical evaluation of the Fourier coefficients, is presented to evaluate the comprehensive performance of three-phase phase-controlled thyristor ac voltage controllers. Three-phase balanced resistive and inductive loads of different power factors are considered. The method of solution adopted is simple, accurate, fast, and does not require the derivation of Fourier coefficient equations. Various electrical properties are compared graphically for the different circuit configurations. The branch-controlled deltaconnected load is considered to have the best performance, giving the highest power factor per unit of power delivered. View full abstract»

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  • Measurement of Power Frequency Fluctuations Using the FFT

    Page(s): 199 - 204
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    A new method for detecting fluctuations in the fundamental frequency component of a power system, by relating it to a leakage coefficient in the FFT, is presented. The phenomenon of leakage in the FFT is used advantageously to increase spectral resolution. The leakage coefficient is a quantitative measure of the deviation from the fundamental frequency component with respect to the sampling frequency. Theoretical aspects are considered along with a method for on-line implementation. View full abstract»

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  • A GTO DC Circuit Breaker Controlled by a Single-Chip Microcomputer

    Page(s): 204 - 209
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    Power semiconductor circuit-breaker application suggests the need for microcomputers that provide firing control, excellent dc short-circuit fault interrupting performance, precise overload protection of themselves, as well as high reliability with minimum components. This paper deals with the prototype dc 1500 V GTO (gate turnoff thyristor) circuit breaker controlled by a single-chip microcomputer. Emphasis is on the GTO junction temperature observation. View full abstract»

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  • Microprocessor-Based Speed Control System for High-Accuracy Drives

    Page(s): 209 - 214
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    A digital speed control system for a dc motor with a pulse tachogenerator for speed sensing is described. A microprocessor is used for fast speed measurement with a response time constant of the order of 8 ms and a resolution of 0.0125 percent of the top speed. This has become possible because of the principle of obtaining the latest speed value based on the previous speed value. This paper describes the principle of speed measurement and control, the flowchart, and the experimental results. A closed-loop speed holding accuracy of ±0.025 percent of the top speed is obtained. View full abstract»

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  • Detection of Rotor Position in Stepping and Switched Motors by Monitoring of Current Waveforms

    Page(s): 215 - 222
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    The paper describes new methods of detecting rotor position in stepping and switched motors, with chopper or series-resistance drives, by monitoring winding currents. In contrast to previous methods of waveform detection, the new techniques are reliable over the complete speed range. It is shown that the most useful indicators of rotor position are: i) current rise times arising from chopping an unexcited phase at low current and ii) the initial rate of current rise as a phase is switched on in a series-resistance drive. Implementation is via simple low-cost electronic circuits and the paper includes discussion of how the techniques can be applied to closed-loop stepping motor control, ministep drives, and optimization of step response. View full abstract»

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  • Pulsewidth Modulation Control of Brushless DC Motors for Robotic Applications

    Page(s): 222 - 229
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    Pulsewidth modulation (PWM) control of brushless dc motors is implemented with digital servo mechanisms for robotic applications. Under the assumption that the pulse period is much smaller than the motor time-constants, the motor is modeled by a discrete-time transfer function with the pulsewidth playing the role of the control signal. This model enables the application of classical linear control engineering to the design of a digital position servo for the brushless dc steering motors on the CMU Rover. The controller is implemented with a microprocessor and programmable timer to calculate concurrently the actuating signals, time sampling periods, and pulsewidths, as well as to provide commutation. Computer simulation and real-time hardware implementation of the servo demonstrate the efficacy of the approach. View full abstract»

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  • Approaches to Design of Ministepping Step Motor Controllers and Their Accuracy Considerations

    Page(s): 229 - 233
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    This paper describes methods of calculating current references for ministepping step motor controllers. An implementation based on piecewise-linear interpolation from motor characteristic curves is presented. This method takes into account motor nonlinearities. Ministepping accuracy so obtained is compared with those of other controllers. View full abstract»

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  • A Microprocessor-Based Electrode Movement Controller for Spot Weld Quality Assurance

    Page(s): 234 - 238
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    Quality assurance has been of a great concern in the process of resistance spot welding, since considerable variation in the weld quality often arises even when the machine variables are held constant. In this paper a new microprocessor-based control method is developed to obtain uniform weld quality regardless of the changing welding environments. The control system utilizes a proportional (P) control algorithm, incorporating with the electrode movement as a feedback variable. The controller generates the welding control current so as to track a desired trace of the electrode movement (reference electrode movement curve) throughout weld cycle. A series of experiments was performed to evaluate the performance of this control method. The results show that, as a result of the electrode movement tracking, weld strengths of all the weldments approach to a desired strength level. View full abstract»

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  • MOSFET Converter-Fed Position Servo System with Sliding Mode Control

    Page(s): 238 - 244
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    Sliding mode control is an effective means to keep a system insensitive to parametric variations and disturbances. In the conventional sliding mode control applied to position servo systems, the sliding mode regime is restricted near the origin, and, therefore, insensitivity cannot be ensured throughout an entire response. This paper presents a new method in which a sliding curve is used instead of a straight line. The sliding curve is defined in such a way that in general the system responds following a max acceleration curve, then a max speed curve, and finally a max deceleration curve. Experimental results confirm that the new method can keep the system robust completely throughout a transient response, which demonstrates the advantage of the proposed sliding curve over the conventional sliding mode strategy. View full abstract»

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  • Disturbance Response Techniques for Digital Control Systems

    Page(s): 245 - 253
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    An adequate disturbance response is important to obtain good regulation in automatic control systems. This paper considers the form of the disturbance response for variable digital control systems with proportional-plus-integral feedback, and derives the relationship between the system responses to both reference and disturbance signals. The choice of optimum parameters is considered, and it is shown that good system response for both reference and disturbance signals can readily be obtained for the case of closed-loop control with complete feedback. View full abstract»

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  • A High-Speed Optical Data Highway for Industrial Control Systems

    Page(s): 253 - 260
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    Recent application of distributed control systems to large-and medium-scale industrial plants requires effective and high-speed communication among the control devices each other to ensure high-performance operation. View full abstract»

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  • Increasing Throughput of Multiprocessor Systems

    Page(s): 260 - 267
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    Many industrial applications require the use of multiple computing elements. The overall performance of such multiprocessor systems is a strong function of the communication capacity of the interconnection bus. By increasing this capacity one can integrate more processors, memory units, and input-output devices together and obtain a higher overall system throughput. In this paper, an analytic model is used to analyze alternative bus architectures. Both the local memory and global memory cases are analyzed; the instance in which the global memory case can be simplified is identified. Finally, the overall impact of implementing queues to increase computational throughput is analyzed. View full abstract»

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  • Opinion

    Page(s): 268
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  • Contributors

    Page(s): 269 - 273
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  • An Essential Reference Book for Engineers and Scientists in the Electrical Disciplines

    Page(s): 274
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  • Research, Design and Development Engineers:

    Page(s): 275
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  • New Titles

    Page(s): 276
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  • Administrative Committee

    Page(s): [276]-a
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  • Standing Committees

    Page(s): [276]-b
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Aims & Scope

IEEE Transactions on Industrial Electronics encompasses the applications of electronics, controls and communications, instrumentation and computational intelligence for the enhancement of industrial and manufacturing systems and processes.

Full Aims & Scope

Meet Our Editors

Editor-in-Chief
Carlo Cecati
DISIM - Univ. degli Studi dell'Aquila
67100 Aquila, Italy
c.cecati@ieee.org
Phone: +39 0862 434 450
Fax: +39 0862 1960 411