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American Institute of Electrical Engineers, Part II: Applications and Industry, Transactions of the

Issue 3 • Date July 1953

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Displaying Results 1 - 12 of 12
  • Arcing time of high-voltage air-break contactors at low currents

    Publication Year: 1953 , Page(s): 145 - 150
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    A high-voltage air-break contactor must be able to interrupt the circuit to motor loads or static loads covering a wide current range. Considerable attention has been given to the ability of contactors to interrupt fault currents, but little has been published on the problem of obtaining satisfactory performance at low currents. The difficulty at low currents is one of getting acceptably short arcing time. View full abstract»

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  • Drag-Cup A-C tachometer with constant-current excitation

    Publication Year: 1953 , Page(s): 150 - 152
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    AS A consequence of recent publication of a general analysis of the drag-cup a-c tachometer,1 numerous inquiries have been received relative to the desirability of operating such a device from a current source. Hence, a brief examination of the possibilities of such operation seems worth while. In these communications the ideas expressed about constant-current operation have been to the effect that with fixed exciting flux extreme linearity of output voltage with respect to speed should be achieved, and that troubles caused by change of winding resistance with change of temperature should be eliminated. Mathematical examination shows that extreme linearity indeed is theoretically possible. However, design difficulties in the tachometer itself, temperature effects other than change in winding resistance, and the difficulties of designing and constructing an adequate current source make doubtful the practical realization of the theoretical advantages of operation from a current source to a sufficient extent to show superiority over operation from a voltage source. View full abstract»

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  • Diesel-electric locomotives in Canada

    Publication Year: 1953 , Page(s): 152 - 155
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    This paper explains briefly the progress of dieselization on the two major railways in Canada. It outlines specific electrical problems encountered and suggests the developments desired to meet their particular type of operation. Information given is in terms of technical reciprocity with the numerous railways in the United States. View full abstract»

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  • Design factors favoring diesel-locomotive electrical maintenance

    Publication Year: 1953 , Page(s): 155 - 157
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    Many details of design of electric apparatus and its installation in the locomotive have a profound effect on the amount and quality of maintenance attention it requires and receives in service. Simplicity and ruggedness are basic. The influence of design upon diesel-locomotive electrical maintenance cannot be overemphasized. This applies not only to the design of the electrical apparatus but also to the design of the conduit and wiring, electrical cabinets, cab structure, and even the diesel engine itself. Taken separately, the following features peculiar to the diesel-electric locomotive must be kept in mind. View full abstract»

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  • Equipment and functions of a modern diesel locomotive heavy electric repair shop

    Publication Year: 1953 , Page(s): 157 - 160
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    Various requirements, procedure, and equipment for maintenance of electric equipment on diesel-electric locomotives are outlined. View full abstract»

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  • An analytical solution of heat flow versus wire temperature for electric cables buried in plaster

    Publication Year: 1953 , Page(s): 160 - 165
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    Complete electric heating installations are becoming quite general throughout certain areas. A popular type is the resistance cable embedded in plaster to form a radiant panel heater. For long cable life and maximum safety, the cable temperature must not exceed a definite limit. Various investigators have derived equations describing the temperature throughout the panel. However such equations do not relate temperature to heat input or else they are based on conditions not met in electric cable heating. K. Kalous1 developed equations for embedded pipe using hot water based upon the simplified assumption that heat flows laterally through the panel. This assumption is valid for panel thicknesses near pipe diameter and for pipe spacing, which is large when compared to panel thickness. Neither condition is met in electric cable heating. T. Napier Adlam2 publishes curves for pipe buried in plaster. The pipe sizes and spacings however, are quite large as compared to electric cable sizes and cable spacing. View full abstract»

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  • A differential-analyzer study of certain nonlinearly damped servomechanisms

    Publication Year: 1953 , Page(s): 165 - 170
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    A servomechanism must hold its error or the difference between input and output, to as small a value as possible. If a large error appears as a result of a rapid change in the value of an input position signal, then high acceleration and high output speed are desirable, and these in turn are favored by a low damping ratio. When the error is near zero, the speed should be reduced rapidly so that overshoot does not occur, and this requires a high damping ratio. Thus the use of nonlinear damping which has some inverse relationship to the error has been proposed by several investigators.1¿5 View full abstract»

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  • Diesel-electric locomotive ground relays

    Publication Year: 1953 , Page(s): 170 - 175
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    The following paper lists and describes the various protective functions of the ground relay as used on diesel-electric locomotives. The connections are described, and comments are made on the control features initiated by the operation of the relay. View full abstract»

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  • Hydraulic servos incorporating a high-speed hydraulic-amplifier actuated valve

    Publication Year: 1953 , Page(s): 175 - 180
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    Electrohydraulic systems have certain advantages over pure electromechanical systems, which make them particularly suitable as an adjunct to electronic control for high-power level actuation. The main factor which has limited the application of hydraulic actuators until recently has been the awkardness of the control systems required. However, developments in the technique of controlling hydraulic flow electrically now permit the flexibility of electronic control to be applied to the linear operation of hydraulic valves at high speeds. View full abstract»

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  • Limiting in feedback control systems

    Publication Year: 1953 , Page(s): 180 - 194
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    Limiting effects exist in feedback control systems because of the restricted range of operation of components or because of purposeful limiting introduced for the protection of equipment. Such limiting effects increase the difficulties associated with the analysis and synthesis of systems because of the nonlinear mathematical relations which result. As such effects can markedly modify system performance, there is a practical need for a simplified method for taking them into account. The effect of limiting on system performance is studied here in terms of the frequency response of the system. It is found that limiting of the most elementary form ¿ simple limiting ¿ improves system stability, except in those systems which are conditionally stable or have a conditional degree of stability. In such instances, precautions are suggested to prevent the limiting action from adversely affecting system performance. It is found that the velocity limiting of a servomotor introduces the effect of phase lead and hence can be used to improve system stability. On the other hand, the limiting of servomotor acceleration directly or indirectly (as by means of current or pressure limiting) is found to introduce a phase-lag effect which can be detrimental to system performance. Electronic analogue computer techniques were employed to obtain much of the data presented here. View full abstract»

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  • Application and operation of D-C drives on rubber calenders

    Publication Year: 1953 , Page(s): 194 - 201
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    D-C motors are used almost universally on rubber calenders to obtain a wide speed range, good speed regulation, maximum braking under emergency conditions, suitable matching of speeds of the auxiliaries with the calender, and on the modern drives, electrical tension regulation of the fabric. The majority of the calenders in operation are driven by adjustable speed d-c motors with conventional armature resistor starting and with rheostat control of the motor field for speed regulation. The more modern installations are equipped with adjustable voltage systems to obtain greater flexibility of operation, better synchronization with auxiliary machines, more suitable power for the constant torque requirements of calender loads, and improved electrical braking under emergency conditions. View full abstract»

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  • Multitransformer welding presses

    Publication Year: 1953 , Page(s): 202 - 208
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (529 KB)  

    Users OF resistance welding equipment are finding ¿presswelding¿ to be ideally suited to many of their high-production applications. In its general concept, presswelding may be likened to present-day stamping-press practice; however, instead of forming or trimming, the weld press produces from 16 to 160 spot welds practically simultaneously on a given assembly. The welding press also differs from the usual stamping press in that the ram or movable platen is generally located in the lower part of the machine. This arrangement facilitates the location of the welding units and usually favors loading of the parts to be welded. Figure 1 shows three typical press types. The 4-post machine is used for large assemblies while the 2-post or open press is used for smaller operations. View full abstract»

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Aims & Scope

This Transaction ceased production in 1963. The current retitled publication is IEEE Transactions on Industry Applications.

Full Aims & Scope