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Industry Applications, IEEE Transactions on

Issue 3 • Date May 1980

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Displaying Results 1 - 22 of 22
  • Table of contents

    Publication Year: 1980 , Page(s): c1
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  • IEEE Industry Applications Society

    Publication Year: 1980 , Page(s): c2
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  • Improved Reliability in Solid-State AC Drives by Means of Multiple Independent Phase Drive Units

    Publication Year: 1980 , Page(s): 321 - 331
    Cited by:  Papers (161)  |  Patents (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (4190 KB)  

    Phase redundancy is a proposed technique for improving the reliability of large solid-state adjustable-frequency ac drives. Based on the more general concept of parallel redundancy, this new technique relies heavily on the inherent capability of a general n-phase ac motor to continue operation with (n -1) or less of its stator phases excited. Motor performance degradation which inevitably accompanies such operation is sensitive to a variety of system parameters including the number of stator phases and the type of excitation source. A thorough evaluation of (n - 1)-phase excitation performance characteristics of an n-phase squirrel-cage induction motor is presented in this paper. Under favorable conditions, a large percentage of the motor's balanced excitation rating can be retained during postfault conditions of steady-state (n -1)-phase excitation. The n-phase-drive units must be conservatively designed to withstand transient stresses associated with fault-induced transitions from balanced n-phase to (n-1)-phase excitation. Key analytical results have been experimentally verified by tests conducted on a 5-hp six-phase squirrel-cage induction motor. Results of this investigation support the basic soundness of the phase-redundancy concept. View full abstract»

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  • Analysis of Commutation of a Current Inverter Feeding an Induction Motor Load

    Publication Year: 1980 , Page(s): 332 - 341
    Cited by:  Papers (5)
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    A method for analyzing the performance of an induction motor fed from a current source inverter and especially for computing the currents during commutation of the inverter is presented. A mathematical model of an inverter-fed induction motor is given in terms of Park's vector. Based on this model a closed form time domain expression is developed for the current during commutation. The stator voltage of a current-controlled inverter-fed induction motor is shown to be almost sinusoidal with superimposed spikes during commutation of current. The computed performance of the machine is verified experimentally, and there is a very close agreement between the computed and test results. The method presented also provides information regarding the voltages across the commutating capacitors and thyristors based on which proper selection of the thyristors and commutating capacitors can be made. View full abstract»

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  • An Approach to Flux Control of Induction Motors Operated with Variable-Frequency Power Supply

    Publication Year: 1980 , Page(s): 342 - 350
    Cited by:  Papers (62)  |  Patents (1)
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    A new speed control system for induction motors has been developed which is capable of controlling with quick field weakening and superior response and stability. This method is to control the stator current as a vector quantity on the basis of slip frequency control. More specifically, it is designed to calculate the commanded stator current of the induction motor by corresponding to flux and torque commands on the basis of motor constants and use the calculated commands to control the stator current. View full abstract»

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  • Rapid Transit Experience with Chopper-Controlled DC Motor Propulsion

    Publication Year: 1980 , Page(s): 350 - 361
    Cited by:  Papers (1)
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    Bay Area Rapid Transit (BART) cars using solid-state choppers and regenerative braking have accumulated about 154 million car mi since 1972 and are adding about 28 million additional car mi/year. For the February 1978 to February 1979 year, the propulsion system mean time between failures (MTBF) was just over 500 h and contributed 37 percent of all vehicle failures. In the same period, the four-traction motor MTBF was 2174 h, which is more than twice its value of several years ago. Modifications currently planned or in progress are expected to increase the propulsion system MTBF to about 800 h by 1981. View full abstract»

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  • Performance Equations for DC Commutatorless Motors Using Salient-Pole Synchronous-Type Machines

    Publication Year: 1980 , Page(s): 362 - 371
    Cited by:  Papers (12)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2362 KB)  

    A large volume of research has been done to analyze commutatorless dc motors using salient-pole synchronous-type machines. These studies have not resulted in clear design-oriented expressions relating performance to machine geometry. The development of design-oriented algebraic expressions of machine performance measures in terms of machine inductances is described. Speed independent equations for commutation angle, commutating current, critical angle, safety angle, average and instantaneous torques, and instantaneous damper currents are developed. Shunt- and series-type machines are analyzed, and numerical examples of both are included. View full abstract»

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  • Measurement of Input Power of DC Motors Operated Using Rectifier Power Supplies and Choppers

    Publication Year: 1980 , Page(s): 372 - 378
    Cited by:  Papers (7)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (4995 KB)  

    The significance of measurements of the ac and dc components of input power of shunt-and series-wound dc motors operated from rectifiers is presented. Suggestions are given to check and improve the degree of accuracy of power measurements using conventional moving-coil wattmeters. A newly developed electronic wattmeter is described which has been found to provide improved accuracy in rectifier applications. Test results are presented. View full abstract»

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  • A Performance Analysis of Microprocessor-Based Control Systems Applied to Adjustable Speed Motor Drives

    Publication Year: 1980 , Page(s): 378 - 387
    Cited by:  Papers (8)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (3558 KB)  

    Speed regulators for motor drives can be classified into four types according to the degree of accuracy and the response time required for a given application. Formulas are presented which can be used to determine the number of bits and the sampling time which are required of a microprocessor for a thyristor drive microprocessor-based speed regulating system. A systematic approach is also proposed which application engineers can use to evaluate and select the most adequate microprocessor from those commercially available for different types of digital speed regulators. View full abstract»

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  • A Microprocessor-Controlled Fast-Response Speed Regulator with Dual Mode Current Loop for DCM Drives

    Publication Year: 1980 , Page(s): 388 - 394
    Cited by:  Papers (36)  |  Patents (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2128 KB)  

    A new control method is described in which a microprocessor is used to regulate the speed of a dc motor driven by antiparallel-connected three-phase dual thyristor converters. A distinct feature of this speed regulating system is that speed response is improved by using a fast-response current controller for the internal loop. A fast-response current controller is obtained by employing a nonlinear compensation subloop and a proportional plus integral compensation subloop. The nonlinear compensation subloop is used to linearize the nonlinear load characteristics of the thyristor converter, which are encountered under discontinuous conduction states of current. The proportional plus integral compensation subloop reduces the deviation of detected current from the current reference. With these two current-control subloops a fast motor speed response is achieved under discontinuous as well as continuous conduction states; hence the steady-state accuracy of speed is improved. A speed regulator using a microprocessor was trial manufactured and tested with a 20-kW dc motor. It was found that an extremely fast controlled current response can be obtained even with a relatively long sampling period. Further, normal action was confirmed in four-quadrant operation. View full abstract»

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  • Pilot Wire Relay Applications in Industrial Plants Utilizing a New Static Pilot Wire Relay

    Publication Year: 1980 , Page(s): 395 - 404
    Cited by:  Papers (4)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (5675 KB)  

    Pilot wire relaying is an extremely effective way to provide fast, selective protection for industrial plant cable tie circuits. The operating principles of popular pilot wire relay schemes will be reviewed, and special attention will be given to a new static pilot wire relay which offers an improvement in ground fault sensitivity, an especially significant consideration on resistance grounded industrial systems. A discussion of pilot wire overvoltages and overvoltage protective devices is also presented. View full abstract»

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  • 1980 Committee Directory of the IEEE Industry Applications Society

    Publication Year: 1980 , Page(s): 396-a - xxx
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  • Protective Devices Coordination via Computer Graphics

    Publication Year: 1980 , Page(s): 404 - 412
    Cited by:  Papers (3)
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    A method of coordinating short-circuit protective devices by the use of computer-generated graphics is described. Manufacturers' time-current characteristic (TCC) curves for protective devices are stored and used by the program in choosing the ratings and settings of devices to produce a fully coordinated system. Computer drafting techniques output both a one-line diagram and time-current characteristic curves on conventional 4¿ by 5 cycle log-log format. View full abstract»

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  • Energy, Incandescent Lighting, and 100 Years

    Publication Year: 1980 , Page(s): 413 - 419
    Cited by:  Papers (3)
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    1979 was the centennial year of light. 100 years ago Edison invented the first practical incandescent lamp. Since then the lamp industry has taken giant steps in developing and perfecting more efficient and diverse light sources. However, the incandescent light source 100 years after its invention continues to keep pace with the industry, providing the backbone to the lighting industry. The history of incandescent lamp development, many diversified applications of incandescent lighting, simple schemes to achieve energy savings, and the latest developments in incandescent light sources are discussed. In a myriad of applications, it is most unlikely to be replaced with any other source. View full abstract»

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  • Lighting Controls, Patterns of Lighting Consumption, and Energy Conservation

    Publication Year: 1980 , Page(s): 419 - 427
    Cited by:  Papers (2)
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    Some of the important areas of the lighting energy conservation research program currently being carried out at the Division of Building Research, National Research Council of Canada, are described. The major emphasis of the program is to monitor present patterns and levels of lighting consumption in offices and schools and then develop and encourage cost-effective control systems to reduce the hours of use of lighting power loads. A new device to measure lighting energy consumption is described. Tine-lapse photography is being employed to obtain detailed information regarding patterns of lighting use in offices and schools. This information is used to develop cost-effective manual- and automatic- control devices. The savings measured with a daylight-linked automatic system installed in a typical office are discussed. View full abstract»

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  • Microprocessor Control of Electric Space Heating

    Publication Year: 1980 , Page(s): 428 - 430
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    The recent arrival of inexpensive computer control systems based on microprocessors has significantly altered the economics of domestic space conditioning control systems. The extensive analysis of thermal systems may now be applied to real systems with satisfactory results. Some general guidelines are presented. View full abstract»

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  • High-Frequency Current Source Inverter

    Publication Year: 1980 , Page(s): 431 - 438
    Cited by:  Papers (4)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (3656 KB)  

    The frequency range of the current source inverter (CSI) is limited by the slow commutation process in the inverter circuit. A method to reduce the commutation time and to limit the commutation capacitor voltage is proposed. A brief description of the conventional CSI and a detailed analysis of the commutation intervals of the proposed circuit are given. The experimental waveforms observed in the laboratory verify the validity of the analysis. View full abstract»

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  • Three-Phase Energy Transfer Circuit with Superconducting Energy Storage Coils

    Publication Year: 1980 , Page(s): 438 - 444
    Cited by:  Papers (4)  |  Patents (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (3209 KB)  

    The operation and circuit analysis of a three-phase inductor converter bridge (ICB) is described. The ICB is used to transfer energy between two superconducting coils and may find application in future tokamak fusion power reactors and large particle accelerators. This circuit provides an efficient, controllable, and reversible means for energy transfer. View full abstract»

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  • An Input Current-Commutated Three-Phase PWM Inverter

    Publication Year: 1980 , Page(s): 445 - 451
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2601 KB)  

    Presented is a dc-side current-commutated inverter configuration where the instantaneous currrent limit functions can be readily implemented. The basic system and the operation of the full-voltage and zero-voltage modes are discussed. The operation of the commutation circuit is explained. Finally, the logic requirements for the generation of any desired output voltage waveform are established. View full abstract»

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  • Frequency and Current Ripple of DC to DC Power Converters with Respect to Different Modulation Techniques

    Publication Year: 1980 , Page(s): 452 - 457
    Cited by:  Papers (2)
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    In connection with dc choppers, different modulation techniques are used. The chopper may be of a transistor bridge type or of any thyristor type. The output current and voltage can be controlled by pulsewidth modulation, pulse-frequency modulation, or two-level control of the load current. The steady-state behavior of the different modulation techniques is shown in comparable equations and diagrams. Also shown are the ranges of the parameters in which it is possible to use the approximate equations for the chopper frequency and the output current ripple. View full abstract»

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  • Static Probe for Electrostatic Field Measurement in the Presence of Space Charge

    Publication Year: 1980 , Page(s): 458 - 463
    Cited by:  Papers (9)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1699 KB)  

    The conduction current to a probe incorporated into an electrode is proportional to the strength of the charge-carrier drift field; this current is modulated by a bias voltage applied betwen the probe and the electrode. The current/bias-voltage probe characteristics are described which have been derived from computation of the bias field distribution. From these design data the probe can be used to determine the strength of an unknown carrier drift field; an inherent self-verification capability is a feature of the technique. Examples of applications to direct-current point-plane corona are given. View full abstract»

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  • Field-Filter Probes and the Measurement of Alternating-Current Corona

    Publication Year: 1980 , Page(s): 464 - 472
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (3413 KB)  

    The principles of the field-filter probe, which is capable of measuring both field changes and conduction current at an electrode in the presence of space charge, are described. Design characteristics are given for a simple field filter and for two further types which can be used for bipolar (reversing) fields and currents. Measurements are given for the discharge characteristics at the plane electrode of rod-plane gaps in the range 50-300 mm subjected to alternating voltages up to 100 kV root mean square (rms). 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.

Full Aims & Scope

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Carlton E. Speck