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Industry Applications Society Annual Meeting, 1990., Conference Record of the 1990 IEEE

Date 7-12 Oct. 1990

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Displaying Results 1 - 25 of 319
  • Ion-flow anemometer using high-voltage pulse

    Publication Year: 1990, Page(s):802 - 808 vol.1
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (544 KB)

    In order to measure stratospheric wind velocity, the technique of ion transit-time measurement is useful. However, it has some difficulties for conventional air-speed measurement. The principle of the proposed anemometer is that the injected ion cloud is accelerated by an electric field, and the induced current of a detector, which is placed between an emitter and a collector, is measured. The tim... View full abstract»

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  • The effect of residential time on the reduction of CO2 from combustion flue gases by a corona torch reactor

    Publication Year: 1990, Page(s):809 - 814 vol.1
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (367 KB)

    The destruction of carbon dioxide gas in simulated gaseous mixtures corresponding to an exit gas composition from a coal-burning thermal power station is investigated. The project is intended to address the issue of the greenhouse effect. The energy consumption evaluation of a coal power plant with proposed CO/sub 2/ reduction processes is also investigated. The performance tests and modifications... View full abstract»

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  • Effect of voltage waveform on partial discharge in ferroelectric pellet layer for gas cleaning

    Publication Year: 1990, Page(s):815 - 821 vol.1
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (566 KB)

    Thermal power plant flue gas cleaning utilizing plasma chemical reactions promoted with partial discharges is studied. Characteristics of a partial discharge in a ferroelectric pellet layer have been studied using AC voltages with varying frequency or using square-wave voltages. The capacitance of the layer, C/sub t/, consists of the capacitance of the ferroelectric pellet, C/sub p/, and the capac... View full abstract»

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  • Design considerations for illuminating industrial control rooms

    Publication Year: 1990, Page(s):2002 - 2003 vol.2
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (170 KB)

    The integration of lighting into the total environment of an industrial control room is discussed, recognizing that the appropriate design of the task, including the equipment itself within the control room, can be more effective in improving the visual characteristics of the environment than the lighting system. An industrial control room description, design considerations, and preferred lighting... View full abstract»

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  • 50% energy savings with automatic lighting controls

    Publication Year: 1990, Page(s):2004 - 2008 vol.2
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (507 KB)

    An electronically ballasted lighting control system that was demonstrated at an office building is described. The system demonstrated the energy savings and demand reduction capabilities of a lighting control system designed to exploit all major control strategies, including scheduling, daylighting and lumen maintenance. After nine months of operation, lighting energy savings of approximately 50% ... View full abstract»

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  • Conference Record of the 1990 IEEE Industry Applications Society Annual Meeting (Cat. No.90CH2935-5)

    Publication Year: 1990
    Request permission for commercial reuse | PDF file iconPDF (549 KB)
    Freely Available from IEEE
  • Effect of induction motor parameter variations on digital computation of transient starting currents and torques

    Publication Year: 1990, Page(s):1 - 7 vol.1
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (620 KB)

    The starting behavior of induction motors and the application of a simulation technique for the prediction of the starting current and torque when switching and reswitching the motor to the supply are addressed. The sensitivity of the starting current and torque to parameter variations is studied. The investigation is performed for different power ratings and design classes. Concurrently practical... View full abstract»

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  • Starting disc rotor for high-output two-pole induction motors

    Publication Year: 1990, Page(s):8 - 11 vol.1
    Cited by:  Papers (2)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (394 KB)

    The starting torque of an induction motor is defined by the loss arising in the rotor at standstill. To increase the starting torque, a configuration should be used that results in a surplus loss in the rotor upon starting, but this loss should disappear at operating speed. This requirement has long been met by the double-cage and deep-bar rotors, although their application was accompanied by some... View full abstract»

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  • Comparative evaluation of power-factor improvement techniques for squirrel-cage induction motors

    Publication Year: 1990, Page(s):12 - 17 vol.1
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (496 KB)

    Relatively simple methods of improving the power factor of squirrel-cage induction motors were tested. The methods evaluated under controlled laboratory conditions for a 10-hp, high-efficiency motor were terminal voltage reduction, terminal static capacitors, and a floating winding with static capacitors. Each of these techniques was tested over a range of torques from zero-load up to 150% of rati... View full abstract»

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  • Measured efficiency of high efficiency and standard induction motors

    Publication Year: 1990, Page(s):18 - 23 vol.1
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (690 KB)

    An induction motor efficiency test program was undertaken by the North Carolina Alternative Energy Corporation to form an independent basis for recommending energy efficient motors to industry in North Carolina. The test program had two objectives: to compare the efficiencies of new motors of the standard and high-efficiency designs, and to compare the efficiencies of new and rewound motors. Sever... View full abstract»

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  • Induction motor residual voltage

    Publication Year: 1990, Page(s):24 - 29 vol.1
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (527 KB)

    The residual voltage in an induction motor under an interrupted power supply condition is considered. The electromagnetic shock at the end of the motor coil due to the excessive surge current and the mechanical impact due to the greater transient torque are investigated. The case when many induction motors are connected to a common bus is studied. Development of the analytical model and a method o... View full abstract»

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  • Amorphous metal alloys wound cores test procedure

    Publication Year: 1990, Page(s):30 - 36 vol.1
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (657 KB)

    The behavior of several samples of amorphous tape-wound magnetic cores excited under sine-wave voltage conditions at 50 Hz is investigated. Measurements of the induced-voltage and the excitation-current waveforms are used to obtain the dynamic (AC) core characteristic loop consisting of the flux density versus ampere-turns and to obtain the core losses. The possibility of using wound core transfor... View full abstract»

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  • Modelling of saturated AC machines including air gap flux harmonic components

    Publication Year: 1990, Page(s):37 - 44 vol.1
    Cited by:  Papers (7)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (629 KB)

    A new saturation model for induction machines is presented which can be easily extended to other types of AC machines. It is shown that saturation is responsible for the generation of flux space harmonic components traveling in the air gap with the same synchronous speed as the fundamental flux component with the third being the dominant harmonic component. Superposition of the effects of the fund... View full abstract»

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  • Induction motor performance when fed from single to three phase converters

    Publication Year: 1990, Page(s):45 - 50 vol.1
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (473 KB)

    The most popular single-to-three-phase converter consists of a capacitor connected between the motor's third phase and either the live or neutral of the single-phase supply. Proper voltage balance at any one given operating point is obtainable with the autotransformer-capacitor converter (ACC), while proper balance over the entire operating range is obtainable with a variable-inductor-variable-cap... View full abstract»

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  • Steady state performance evaluation of saturated field oriented induction motors

    Publication Year: 1990, Page(s):51 - 60 vol.1
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (742 KB)

    Steady-state performance characteristics of the stator field oriented control, air-gap field oriented control and rotor field oriented control induction motor drives are compared. Effects of the magnetizing flux saturation on the magnetizing inductance and conductor temperature on the rotor resistance are rigorously included in the performance equations. Key performance indices, such as relative f... View full abstract»

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  • Torque and slip behavior of single-phase induction motors driven from variable frequency supplies

    Publication Year: 1990, Page(s):61 - 66 vol.1
    Cited by:  Papers (17)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (499 KB)

    Adjustable-frequency drives have not been widely used with single-phase induction motors. Computations show that, unlike the three-phase induction motor, the single-phase induction motor's slip is not constant with changes in frequency at a constant load torque. A constant volts-per-hertz law is found to provide nearly rated torque over a portion of the upper speed range, but the maximum available... View full abstract»

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  • Characterization of the brushless, doubly-fed machine by magnetic field analysis

    Publication Year: 1990, Page(s):67 - 74 vol.1
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (728 KB)

    The magnetic fields produced by the stator windings and induced via the rotor of a composite, cascade induction machine are investigated with simplified operating assumptions. The rotor used is the single-layer, modified cage developed by A. R. W. Broadway and L. Burbridge (see Proc. IEE, vol.117, p.1277-90, 1970). The input and control circuits share the same stator coils. The operation of the ma... View full abstract»

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  • Starting performance of delta-modulated inverter-fed submersible motors

    Publication Year: 1990, Page(s):75 - 83 vol.1
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (460 KB)

    An analysis of the starting performance of tuned delta-modulated inverter-fed submersible motors is presented. Submersible motors are induction motors that have unique constructional features. These motors are required to operate in one of the most harsh environmental conditions. The operating characteristics of a submersible motor pump system require soft starting facility and variable-speed oper... View full abstract»

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  • MRAC based speed regulation of an excitation controlled quick response induction motor

    Publication Year: 1990, Page(s):84 - 92 vol.1
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (714 KB)

    Speed regulation of a voltage decoupled induction motor which provides optimal efficiency and quick response is discussed. A robust first-order model reference adaptive control (MRAC)-based speed controller whose stability has been proved via Lyapunov's second method is proposed. Computer simulation results for a 100-hp squirrel-cage motor show that the proposed MRAC controller has remarkably good... View full abstract»

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  • Analysis of an induction motor fed from asymmetrical phase converter

    Publication Year: 1990, Page(s):93 - 98 vol.1
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (688 KB)

    Of the various types of single-phase-to-three-phase static converters used to interface a three-phase motor to a single-phase supply, one simple type uses an open delta connection of a sinusoidal supply and a PWM waveform to feed the motor. An analysis of the performance of the three-phase motor fed from such an asymmetrical supply is presented. The analysis is based on the steady-state approximat... View full abstract»

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  • Control of mechanical vibrations in DC machines

    Publication Year: 1990, Page(s):99 - 101 vol.1
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (292 KB)

    A method of reducing mechanical vibrations generated in a DC machine is presented. The method consists of an addition of ampere turns to the usual excitation and armature currents. Extra coils have been wound on the main excitation poles and when properly supplied, the vibration level at different points on the outer surface of the motor is significantly reduced. It appears that for a given freque... View full abstract»

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  • Test procedure for very high speed spindle motors

    Publication Year: 1990, Page(s):102 - 108 vol.1
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (685 KB)

    Induction motors fed by nonconventional supplies at a very high frequency are discussed. In order to evaluate the total motor losses and the single loss components, a test bench with synchronous machine capable of working at up to 2 kHz with sinusoidal output voltage has been set up. An induction motor equivalent circuit with parameters depending on the frequency is proposed. The proposed nonlinea... View full abstract»

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  • Comparison of the audible noise level emitted by inverter-motor combinations

    Publication Year: 1990, Page(s):109 - 115 vol.1
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (544 KB)

    The audible noise of medium-sized squirrel-cage induction motors is analyzed for various inverter-motor combinations. Two motors are analyzed, one standard 90-kW double-cage induction motor and one with heat pipe cooling, having a higher specific output. The latter is equipped with two rotors, one with 27 slots and one with 28. Both machines have four poles. The overall value of the audible noise ... View full abstract»

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  • Facility for automated testing of induction motors

    Publication Year: 1990, Page(s):116 - 121 vol.1
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (493 KB)

    The software and hardware design of an automated induction motor testing facility at Industrias IEM, Mexico, is described. The test motors range in power between 75 and 3000 hp, with 2-14 poles at voltages of up to 6600 V. The system performs seven tests in either a standard or a customized format, under the control of a personal computer/programmable controller combination. Test motor loading is ... View full abstract»

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  • Prediction of vibration levels and resonant frequencies in static electrical apparatus

    Publication Year: 1990, Page(s):122 - 127 vol.1
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (376 KB)

    Results of computer simulations obtained by a finite-element package, FLUXMECA, are presented and compared with experimental measurements of vibrations of static inductors. The objective is to reduce the vibrations' level and the acoustic noise of the transformers. Resonant frequencies and the mechanical behavior of the inductors are predicted with a mechanical finite-element model coupled with Ma... View full abstract»

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