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Industry and General Applications, IEEE Transactions on

Issue 1 • Date Jan. 1970

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Displaying Results 1 - 22 of 22
  • IEEE Transactions on Industry and General Applications - Table of contents

    Page(s): c1
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  • IEEE Industry and General Applications Group

    Page(s): c2
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  • New Officers in the IGA Group

    Page(s): 1 - 2
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  • New Fellows in the IGA Group

    Page(s): 3 - 6
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  • A Message from the Chair

    Page(s): 7 - 9
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  • Plugging an Induction Motor

    Page(s): 10 - 18
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    Plug stopping a low-inertia squirrel-cage induction motor can provide a very quick stop, but the motor draws high peak currents from the power system and delivers high transient torques to the driven machinery. This engineering phenomena is well documented, yet the potential pitfalls of plugging applications are often not appreciated. The induction motor is so widely used in industry that a review of its plugging characteristics may be useful. View full abstract»

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  • Wide Speed Range Inverter

    Page(s): 19 - 23
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    The literature has documented well the characteristics of many different types of inverter circuits. One such circuit is described in detail. A brief theory of operation is given, together with the reasons for choosing this particular circuit and some of the advantages and disadvantages accruing to its use. Finally, a number of optional features will be described which are available to allow the customer to "tailor" a basic inverter to his particular application. View full abstract»

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  • Bus and Switchgear Protection

    Page(s): 24 - 28
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    This paper is a first draft of Chapter XI of a proposed publication on preferred practice in system protection and coordination being developed by the Industrial and Commercial Power Systems Committee of the IGA Group. It presents ideas on the application of protective equipment to industrial and commercial power system buses and switchgear. View full abstract»

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  • New Developments in High-Frequency Power Sources

    Page(s): 29 - 35
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    The induction heating industry has recently introduced a new high-frequency power source, the static frequency converter. The converter uses solid-state low-loss thyristors to guide currents to the induction heating load generating high-frequency power at high efficiency. Unlike the conventional motor generator, the output frequency of the static converter is variable, being self-controlled from the induction heating load. It follows the load impedance and adjusts itself to maintain preset conditions. This paper describes to the potential induction heating user what a static converter is, how it works, and how it compares with its more familiar counterpart, the motor¿generator. View full abstract»

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  • A Power Frequency Plasma Torch for Industrial Process Heating

    Page(s): 36 - 42
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    A power frequency plasma torch is described specifically designed for application to industrial heating processes using a magnetically rotated radial arc for which efficiency and reliability were considered to be the main criteria. Operation at moderate supply voltage with a high overall circuit power factor is obtained by using a separate ignition supply for reigniting the arc at each half-cycle. The design is based on a wide range of preliminary investigations many of which may be applied to both ac and dc plasma torches or other arc operated devices. The operating characteristics of the plasma torch are given, and a thermal balance has been carried out enabling the efficiency to be accurately measured. An efficiency greater than 60 percent has been measured in this way. View full abstract»

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  • An Accurate Surface Temperature Measuring System

    Page(s): 43 - 47
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    A system is described that provides accurate contact surface-temperature measurement that is free from conduction error and heat perturbation of the measured surface. The principle is one of null heat flow provided by an electronically servoed backup heater. The probe consists of three basic parts: a measuring contact thermocouple, a differential thermocouple, and a heater, mounted in tandem. The measuring junction and one junction of the differential couple contact the surface. The second differential junction is located a short distance behind the first junction so as to have a thermal path between the junctions. The backup heater is located behind the second junction. When the probe contacts a surface that is above probe temperature, the first differential junction rises in temperature above the second junction, producing an EMF which is fed into the electronic servo. This signal is amplified, and quickly energizes the electric backup heater by the amount required to reduce and maintain the differential signal at zero. Under this condition, there is no heat exchange between the probe and the surface; the measuring junction is at the surface temperature. Present temperature capability extends from ambient to approximately 2250°F. Future designs are expected to extend the upper limit to about 3000°F. View full abstract»

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  • Large Single-Phase Motors for Low Starting Torque Application

    Page(s): 48 - 51
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    Large single-phase motors (15-50 hp) have been developed. These are capacitor start-capacitor run squirrel-cage induction motors. They are designed with very low inrush current and have low starting torque. Breakdown torque and full-load (FL) performance are normal for single-phase motors. These motors are specifically designed for crop dryer fans, irrigation pumps, forage blowers, liquid manure pumps, any application where low starting torque (50-percent FL) is sufficient. View full abstract»

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  • Use of Models to Control Electroheat Processes

    Page(s): 52 - 56
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    Control of first-order thermal plants with inherent time lags by means of hystereitc ON¿OFF controllers is investigated. Open-loop pulse-duration-modulation control of the same class of plants is briefly analyzed. A scheme is investigated where the plant is controlled on an open-loop basis by a controller which is included in a feedback loop containing a model of the plant. The parameters of the model can deliberately be made different than those of the process. By a suitable choice of these model parameters better performance criteria can be obtained, especially when they exist due to the distributed nature of thermal processes and to the location of temperature sensing units. View full abstract»

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  • Electrically Indirectly Heated Fluidized Beds

    Page(s): 57 - 64
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    An important class of fluidized beds has been investigated, those that are indirectly heated by electrical elements inserted in the fluid flow before the bed. They are commonly used for drying, chemical synthesis, mixing, coating, and similar industrial processes. New models have been developed that are simple to manipulate and are determined by tests at only three flow rates. These models have a high degree of accuracy in the initial treatment region that is of importance in control studies. View full abstract»

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  • Protecting Tubular Heating Elements Against Moisture

    Page(s): 65 - 68
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    This paper presents a method of treating tubular heating elements operating below 550°F so as to minimize the effect of moisture on the impedance between the sheath and the heater wire of the elemnent. View full abstract»

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  • Progress on Development of IEEE-ASAE Rural Motor Starting Application Guide

    Page(s): 69 - 70
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    Integral horsepower motors from 1 to 30 hp are becoming more common on fanns for large feeding, crop drying, and irrigation systems [1]. Multiple-motor loads of 20 to 65 hp or more are being operated on single-phase power [2], [3]. As large motor loads on rural systems become more numerous, the problems associated with their use need more attention. View full abstract»

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  • Underground for Rural Areas

    Page(s): 71 - 73
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    The already high ratio of investment to income in rural areas is a big problem. But, the additional investment in selective underground rural distribution (URD) primary is justified where exposure to tree and storm expense is indicated. A bonus result will be found in improved service. The engineer must be ready to substitute insulated overhead construction where unusually difficult soil conditions exist' Savings in operating costs associated with ground installed secondaries, services and transformers, however, are not sufficient to warrant their installation in rural areas. However, URD, wisely applied, is a distinct improvement; economically, URD is worth the additional cost of initial installation when reasonably applied; and we cannot afford to be without a sound underground program, even in our most uneconomical service areas. View full abstract»

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  • Design Considerations for Microwave Oven Cavities

    Page(s): 74 - 80
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    The heating mechanism in a microwave oven results from the interaction of a high-frequency electromagnetic field and the food within it. In most ovens the field is generated by a magnetron which converts dc energy to high-frequency energy at approximately 2450 MHz. This energy is then propagated into the oven chamber which is, in reality, a multimode resonant cavity where the energy is reflected from the walls to create standing wave patterns. To properly design a microwave oven, one must consider not only the magnetron but also the dimensions and resonant properties of the oven cavity. The designer must strive for a uniform energy density within the cavity for uniform cooking of the food and must be sure the cavity presents the proper load to the magnetron. These objectives are discussed, and a procedure for obtaining them is outlined. View full abstract»

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  • The Custom Ice Dispenser

    Page(s): 81 - 87
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    The custom dispenser is an electromechanical system for automatically delivering ice cubes or chilled water through the door of a domestic refrigerator into the user's glass at the touch of a button. This revolutionary product feature is the result of the efforts of many people rather than the idea of one individual. View full abstract»

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  • Simplified Air Density Correction of Vacuum Cleaner Performance Data

    Page(s): 88 - 94
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    This paper presents a simplified method for absolute determination of the perfornance correction for air density variations in a convenient ready to use form. It was developed through the use of computer analysis of data for 14 widely differing vacuum cleaner motors. By acknowledging that a 1-percent error in the vacuum correction factor was acceptable, a single curve was developed. A wattage correction factor curve was also developed. Because of the variance in efficiencies between motors, however, this curve has an error range of 4 5 percent. The curves were then verified experimentally by more than 1000 tests taken in environmental and altitude chambers in the ambient range from 50 to 100°F and 24 to 30 inches of mercury barometric pressure. View full abstract»

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  • Digital Controls and Monitoring Techniques

    Page(s): 95 - 99
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    Because of their inherent accuracy and dependability, direct digital controls now find a wide assortment of applications in industry. Their modular nature and simplicity of function make them adaptable in a variety of permutations to an extensive variety of problems. The fundamentals of these digital control systems and how they can be applied in general and specifically in the rubber and plastics industry are discussed. View full abstract»

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  • IGA Group Chapter Chairmen

    Page(s): 99-a
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Aims & Scope

This Transaction ceased production in 1971. The current retitled publication is IEEE Transactions on Industry Applications.

Full Aims & Scope