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Industrial Electronics, IEEE Transactions on

Issue 1 • Date Feb. 1984

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Displaying Results 1 - 25 of 26
  • Table of contents

    Page(s): c1
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  • IEEE Industrial Electronics Society

    Page(s): c2
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  • Message from the Past President A Brief History of the Industrial Electronics Society of IEEE

    Page(s): 1 - 2
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  • Model Matching with Improved Transmission of Measuring Errors

    Page(s): 3 - 8
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    This paper considers the problem of matching a system under control to a model using output feedback when both the given system and the model are described by nonparametric models, such as their impulse response matrices. The problem of matching is reduced to that of solving a linear system of equations by choosing a set of samples of the response impulses. The ``condition number'' concept of numerical analysis is used in order to achieve a good transmission of measuring and/or computation errors towards the desired control results, which consist in this case in determining the feedforward and feedback compensator matrices necessary for matching purposes. If the distribution of the samples is adequate, the quality of the compensation may be greatly increased even under measuring (or computing) errors in observing (or calculating) the impulse response matrices. Applying this technique, one example is solved by simulation. View full abstract»

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  • A Digital Torque Angle Transducer

    Page(s): 8 - 11
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    This paper describes a digital transducer which displays the torque angle of a synchronous machine operating in motoring or generating modes. The transducer can also provide a torque angle feedback signal for digital control applications in power systems. A signal indicating the rotor position, which is detected using a photo device, is compared with the terminal voltage reference, and the phase shift indicating the torque angle is processed to provide a digital display. Though very simple circuits have been used in building the transducer, very accurate and stable readings are obtained. The sampling technique used in the counter makes the reading independent of minor variations in line frequency. Experimental results are presented to indicate the performance of the circuit. The transducer can be modified to indicate angular speed. View full abstract»

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  • Loading Characteristic and Optimum Switching Conditions of Multistack Variable Reluctance Type Stepping Motors

    Page(s): 11 - 17
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    This paper deals with the relationship between the angular positional error of the rotor of a multistack variable reluctance type stepping motor and the average motor torque at various operating speeds. The relationships have been established theoretically using a linear model and experimentally using a lag measuring circuit over the slewing range of stepping rates. With the help of this approach the dynamic performance of this type of steppers has been studied and its limits defined. View full abstract»

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  • SCR-Controlled DC-Motor Model for an Electric Vehicle Propulsion System Simulation

    Page(s): 18 - 25
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    A model of a silicon-controlled rectifier (SCR) dc-series wound motor drive is described and evaluated. The model, developed for use in a digital simulation of an electric vehicle (EV), requires a minimum number of input parameters while taking into account the fluctuating nature of the flow of motor current. The equations derived are solved explicitly for motor current, thus giving an efficient computer implementation. The control input to the model is the duty cycle of the switching waveform to the SCR. The output from the model is average motor torque. The results are valid over the ranges of frequency and duty cycle typically used in EV motor drives. A generalized formulation, which will accept a nonlinear magnetic flux characteristic, is derived and applied in the simulation of an EV driven by a 42-hp dc traction motor. All relevant simulation model parameters were taken from an EV used in a series of field tests. Experimental measurements of motor current demand over a complex driving cycle were compared with a corresponding set of simulation results. Agreement between the two sets of results was found to be good. View full abstract»

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  • Application of Doubly Fed Induction Motor in Power System State Measurements

    Page(s): 26 - 27
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    In a large interconnected power system, any strategy for the control of transient modes after a major disturbance requires a fast and reasonably accurate measurement of power angle and speed or frequency deviations. These data are given to the controlling device for performing the corrective actions. View full abstract»

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  • Analysis of a Static VAR Compensator with Optimal Energy Storage Element

    Page(s): 28 - 33
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    This paper analyzes a single-phase static VAR compensator, based on the current source-forced commutated inverter. Emphasis is given to the subject of energy storage in the circuit. View full abstract»

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  • A Thyristor Inverter for Medium-Frequency Induction Heating

    Page(s): 34 - 36
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    This paper is concerned with the development of a current-fed-type inverter suitable for induction heating and melting applications in the medium-frequency (1-5 kHz) range. The control circuitry, load power factor control, thyristor turn-off control, and protection techniques are discussed. A simple and reliable starting scheme has been developed which provides reliable start-up with all practical loads. The starting circuit has a main and an auxilliary part. The necessity of one or both of these starting circuits is discussed. Experimental results from a prototype unit are presented. The performance of the equipment has been found quite satisfactory. View full abstract»

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  • Performance Determination of a Chopper-Controlled Separately Excited DC Motor

    Page(s): 37 - 42
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    Chopper-controlled dc motors have a wide field of application as variable speed drives. The techniques used for chopper control of dc power make use of pulse-width modulation (PWM), pulse-frequency modulation (PFM), and current-limit control. Of these, the pulse-width modulation and current-limit control are more widely used. View full abstract»

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  • Improved PWM Control Strategy for Inverters and Induction Motor Drives

    Page(s): 43 - 50
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    This paper develops a novel pulse-width modulation (PWM) strategy for application in uninterruptible power supply (UPS) and ac motor drive systems. The voltage/current harmonic spectra and other properties of this PWM scheme are thoroughly investigated. This modulation strategy is compared with other modulation techniques, especially with the commonly used sinusoidal modulation scheme, from the standpoints of simplicity, inverter switching losses, motor losses, and other output performance features. This novel modulation scheme produces an acceptable motor curent waveform while keeping the number of inverter commutations low. Implementation of this scheme is quite simple in hardware-based as well as microprocessor-based systems. View full abstract»

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  • New Solar Cell Power Supply System Using a Boost Type Bidirectinal DC-DC Converter

    Page(s): 51 - 55
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    A new solar cell power supply system is presented, in which the boost type bidirectional dc-dc converter and the simple control circuit with a small monitor solar cell are employed to track the maximum power point of the solar array. It is confirmed by the experiment that the new system has sufficiently precise tracking operation performance and satisfactorily high power efficiency. Also, a comparison of the power efficiencies is made theoretically, as well as experimentally, on the new and the conventional solar cell power supply systems. As a result, it is revealed that the new system is superior to the conventional one in the power efficiency. View full abstract»

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  • Estimation of Execution Times of Process Control Algorithms on Microcomputers

    Page(s): 56 - 60
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    An important question which has to be answered in evaluting the suitability of a microcomputer for a control application is the time it would take to execute the specified control algorithm. In this paper, we present a method of obtaining closed-form formulas to estimate this time. These formulas are applicable to control algorithms in which arithmetic operations and matrix manipulations dominate. The method does not require writing detailed programs for implementing the control algorithm. Using this method, the execution times of a variety of control algorithms on a range of 16-bit mini- and recently announced microcomputers are calculated. The formulas have been verified independently by an analysis program, which computes the execution time bounds of control algorithms coded in Pascal when they are run on a specified micro- or minicomputer. View full abstract»

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  • A Microcomputer-Based Propulsion Control System of a Hybrid Electric Vehicle

    Page(s): 61 - 68
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    This paper describes a hybrid electric vehicle drive control system under microcomputer control where the propulsion power is shared between a gasoline engine and a dc motor. The control functions have been developed, analyzed, and implemented with highlevel language in a dual Intel 8086 microcomputer system. The drive system has been integrated and tested, and shows excellent results. View full abstract»

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  • Microprocessor-Based Optimal-Efficiency Drive of an Induction Motor

    Page(s): 69 - 73
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    A method for improving the efficiency of a slightly loaded induction motor is suggested. It is based upon the optimal-efficiency slip tracking by adjusting the voltage to frequency ratio (V/f). It has adopted the converter-inverter fed induction motor drive system. All the control loops are implemented by the Z-80 microprocessor. By this method, 10 percent or more improvement is obtained at a quarter of the full load. View full abstract»

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  • A Microcomputer-Based Thyristor Leonard System Having Powerful RAS Functions

    Page(s): 74 - 78
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    The microcomputer-based entirely digital scheme for the thyristor Leonard system is presented. The main processor used is a 16-bit microprocessor. Systematic and efficient use of the microprocessor and microcomputers successfully provides the thyristor Leonard system with the entire digital scheme. This scheme offers not only the high-performance adjustable-speed regulation of dc motors, but also other important functions and features required for the Leonard system, such as system sequencing, thyristor triggering, various compensations for improvement in electric performances, diagnostic, monitoring, and protection capabilities, drift-free characteristics, and so forth. The scheme also serves smoother communications between the microcomputer-based system and a programmable host controller, which supervise a number of Leonard systems. Compact design permits the hardware construction for the digital scheme to be accommodated on a single board. View full abstract»

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  • Microprocessor Implementation of PID Controllers and Lead-Lag Compensators

    Page(s): 79 - 85
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    This paper discusses the microprocessor implementation of two widely used industrial controllers: the PID controller and the Lead-Lag compensator. The main characteristics of this implementation are the general form of the equations used, the high precision maintained, and the capability of handling a wide range of numbers by means of floating point representation in the microprocessor. An 8-bit general purpose microprocessor is employed, and the entire hardware and software required for the floating point arithmetic simulation and the controller's realization are presented. The flexibility of the proposed design is also discussed. The material presented in this paper may be useful to control engineers interested in microprocessor-based control, as well as to microprocessor/computer specialists interested in applications to the control field. View full abstract»

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  • Parameter Estimation Using Microprocessors and Adaptive Random Search Optimization

    Page(s): 85 - 89
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    An optimization procedure is presented which can be used for off-line system parameter estimation. The technique utilizes a model reference adaptive control configuration and an adaptive random search to identify the parameter values for an arc voltage control system of an automatic welding process. An 8-bit microprocessor is used to acquire data from the system, and a microprocessor development system performs the optimization routine. View full abstract»

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  • An On-Line Pneumatic Cigarette Inspection Device Based on Two Tightly Coupled Microprocessors

    Page(s): 90 - 97
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    Ventilation is a technique for controlling the amount of both nicotine and tar delivered to smokers. VECOM is a system designed to control cigarette ventilation. It operates on every cigarette, on-line with the production process, taking measurements in accordance with a pneumatic model of ventilated cigarettes. Presented are the problems associated with performing on-line measurements, error correction, and overall system organization. View full abstract»

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  • Letters to the Editor

    Page(s): 98 - 100
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  • Contributors

    Page(s): 101 - 105
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  • Now is the best time to join our society [advertisement]

    Page(s): 106
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  • IEEE copyright form

    Page(s): 107 - 108
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  • Administrative Committee

    Page(s): 108-a
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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