... Adjustable Speed Drives (ASD), AC induction motors, AC synchronous motors, centrifugal pumps, and positive displacement pumps were ...

Traditionally, fans and pumps have been designed to be capable of handling the maximum demand of the system in which they are installed. However, quite often the actual demand can vary and it can be much lower than the original design capacity. These situations have been corrected in the past through additions of outlet dampers to fans or throttling valves to pumps. While these can be effective ...

The paper discusses EPA's research program to develop fuzzy-logic-based energy optimizers for alternating-current (AC) induction motors driven by Adjustable Speed Drives (ASDs). The technical goals of the program are to increase the efficiency of ASD/moto...

Efficiency relative to adjustable speed drives--which amounts to minimizing losses in each component--is discussed in general. A history of the efficiency and drive proceeds from the world (fifty years ago) of inefficient wound-rotor motors with secondary resistor control into the 1930's where the introduction of the packaged D-C ...

This paper proposes a maximum output power control system of variable-speed small wind generators. Paying attention to an optimum rotational speed of a single phase AC wind generator which can obtain maximum output power according to natural wind speed, the proposed method adjusts the ...

Centrifugal pumps are generally sized to operate at or near the best efficiency point at maximum flow. The maximum flow requirements, however, frequently occur for a very short period during the operating cycle with the result that some method of flow control is required. The traditional approach to flow control has used valves which increase system pressure and inherently waste energy and ...

An AC electric motor drive system has been evaluated as a means of engine loading for production engine hot testing. It has been demonstrated that an 80% reduction in test cycle stabilization time is possible when compared with the water brake dynamometer that is commonly used in production engine testing. Hot testing is normally a bottleneck in engine assembly, and the number ...

previously developed to estimate the capacitor lifetime with ac line inductors [9] can be used for ASD in Table III provide useful estimates for predicting the capacitor lifetime as they did with ac line. Pixler, "Modeling and analysis of dc link bus capacitor and inductor heating effect on ac drives (Part I

The bibliography contains citations concerning types and applications of adjustable speed drives (ASD). Uses in heat pumps, fans, compressors, electric motors, boiler feed systems, and power transmission are described. Coverage includes AC-DC motors, induction motors, and brushless electric motors. Energy cost savings are also ...

This book is divided into: technology of energy-efficient motors, selection and application of energy-efficient motors, efficiency labeling and verification, power factor, single-phase and synchronous motors, adjustable speed drives, and ac motor control and protection. (DLC)

Electric motors are significant users of electricity in the United States. Approximately 66 percent of the total electricity in the U.S. is used by electric motors. Electronic adjustable speed drives (ASDs) can save energy, lower maintenance cost and improve product quality. By providing a variable frequency output to ac motors the ...

The paper discusses EPA's research program to develop fuzzy-logic-based energy optimizers for alternating-current (AC) induction motors driven by Adjustable Speed Drives (ASDs). he technical goals of the program are to increase the efficiency of ASD/motor combinations (especially...

A prototype electronic load governor is very briefly described. The governor is designed for electrical generating systems with ratings up to 100 kilowatts at 50 or 60 hertz isolated from grid networks and fed by three-phase, synchronous ac generators. The governor maintains the speed of the set by adjusting an electrical ballast load ...

Offering an introduction to power electronics, this text considers the topics of analogue electronics, electric motor control, and adjustable speed electrical drives, both a.c. and d.c. Up-to-date in its coverage of this rapidly developing field, the book examines such topics as controlled bridge rectifiers and ...

Techniques for energy conservation of reducing losses in ac motor driven systems were compared. The impact on electric utility system as a harmonics, power factor of operation, and Electro Magnetic Interference (EMI) is considered. The techniques evaluated are: (1) the NASA Power Factor Controller, a simple device for reducing power losses in lightly loaded ...

This paper presents and discusses techniques for energy conservation by reducing losses in ac motor driven systems, proposed by the technical community in response to surging cost of energy. An important aspect considered is the impact on electric utility systems in terms of harmonics and power factor of operation. The techniques evaluated in this paper are listed below. 1. ...

motor speed control, consider the use of alternating current (AC) variable frequency drive ... AC variable frequency systems for motor speed control offer ...

An uncluttered secondary induction machine (100) includes an uncluttered rotating transformer (66) which is mounted on the same shaft as the rotor (73) of the induction machine. Current in the rotor (73) is electrically connected to current in the rotor winding (67) of the transformer, which is not electrically connected to, but is magnetically coupled to, a stator secondary winding (40). The ...

Adjustable speed AC drives have become the preferred choice in many industrial applications where controlled speed is required. At the same time, the maturing of the technology and the availability of fast and efficient solid state power semiconductor switches (IGBTs) has resulted in voltage source, PWM controlled ...

A requirement essential to the advancement of ac adjustable speed drive technology is well-balanced progress of various element technologies -- motors, devices, converters, sensors, materials, modern controls, and microcomputers. This report presents the results of an effort by the Electric Power Research Institute: (a) to better ...

This patent describes an engine control apparatus coupled to an engine of a vehicle used in combination with an automatic transmission for controlling engine speed including: calculation means for calculating a base desired engine speed as a function of engine operating parameters; adjustment means for adjusting ...

A system is disclosed for storing electrical energy and for converting dc power to ac power. The system includes a very large flywheel which is mounted in an evacuated housing and is driven by a plurality of wheels powered by dc electric motors which receive current from an input power source. An independent plurality of wheels coupled to ac generators ...

This paper describes two variable speed ac-drive systems, a synchronous generator with frequency convertor for large speed ranges and a rotor cascade induction generator for small variations of speed. Results obtained with transient state calculations usi...

The largest opportunity for the growth of adjustable speed drives (ASDs) during the next 5-6 years is in pump, fan and compressor (PFC) applications where a constant, fixed speed operation is converted to adjustable speed in order to realize energy saving...

Techniques for energy conservation of reducing losses in ac motor-driven systems proposed by the technical community in response to surging cost of energy are evaluated and compared. Report objectives are to provide better understanding of underlying principles and to evaluate technical and economic viability of these techniques for various applications. An important aspect ...

This study evaluates the feasibility of modulating heat pump capaciy by compressor-motor speed variation. Six adjustable speed ac motor drive methods are addressed for unitary reciprocating and rotary compressors for residential and light commercial applications. The six techniques include: square wave, voltage ...

...AC-powered adjustable hospital bed is a device intended for medical purposes that consists of a bed with a built-in electric motor and remote controls that can be operated by the patient to adjust the height and surface contour of the bed....

A fuzzy logic, energy optimizing controller has been developed to improve the efficiency of motor/drive combinations which operate at varying load and speed conditions. The energy optimizer is complemented by a sensorless speed controller which maintains motor shaft revolutions per minute (RPM) to produce constant output power. Efficiency gains of from 1 ...

Dissipative spin-tunneling transitions at biased resonances in molecular magnets such as Mn12 Ac are controlled by the dipolar field that can bring the system on and off resonance. It is shown that this leads to spin relaxation in form of propagating fronts of tunneling, with the dipolar field adjusting self-consistently to provide a zero bias within the ...

In many industrial applications, variable speed drives of electrical machines are needed. This speed control can be met either by dc or ac machines. The ac machines have several distinct advantages compared to dc machines due to the absence of commutators, therefore, a variable -voltage, variable-frequency power ...

The largest opportunity for the growth of adjustable speed drives (ASDs) during the next 5-6 years is in pump, fan and compressor (PFC) applications where a constant, fixed speed operation is converted to adjustable speed in order to realize energy savings. Inverter supplied induction motors ...

The air-conditioning (A/C) compressor load significantly impacts the fuel economy of conventional vehicles and the fuel use/range of plug-in hybrid electric vehicles (PHEV). A National Renewable Energy Laboratory (NREL) vehicle performance analysis shows the operation of the air conditioner reduces the charge depletion range of a 40-mile range PHEV from 18% to 30% in a worst ...

This report describes the sources of wind speed records obtained during the passage of Marilyn, adjustments/corrections made to these data to obtain a common or standardized basis for comparision, and the use of these adjusted speeds to validate surface a...

... sighting a turtle: � Slow vessel and line reel speed � Adjust direction of the vessel to move toward ...

This two-page tip sheet provides practical tips on application of Adjustable Speed Drives in industrial settings.

... Abstract : This TechData Sheet is intended to help activity personnel identify cost effective energy projects for energy projects for Adjustable Speed ...

Conveyor techniques and equipment are constantly reviewed and evaluated by large capacity mining operations burdened by the heavy operating costs of truck haulage. Although conveyors are known to be cheaper to run and far less affected by poor site conditions, the high capital cost of a change to a conveyor system has been the primary prevention to a site conversion. This paper reviews a newly ...

A variable speed controller for an alternating current induction motor reestablishes the start time for firing pulses and clock pulses in a circuit having a uniform frequency generator generating firing and clock pulses. Feedback from the stator terminals sets an oscillator with a sawtooth type ramp output. Subsequent feedback from the stator terminals are compared with the ...

This paper describes two variable speed ac-drive systems, a synchronous generator with frequency convertor for large speed ranges and a rotor cascade induction generator for small variations of speed. Results obtained with transient state calculations usi...

... Accession Number : ADD122020. Title : Wear of High Speed Steel Tool in Wet Cutting 7075 and AC3A,. Corporate Author : ...

A battery heating system is comprised of a number of storage batteries and an alternator driven by a variable speed prime mover connected to supply ac heating current to the batteries. The system is arranged so that the ac current is substantially constant over the working speed range of the prime mover.

high speed diesel engines. The closed type of nozzle was widely applied for high speed diesels because of the ac- . curacy of their injection ...

... Accession Number : ADD126483. Title : Adding Effects of Strontium and Antimony on High Speed Steel Tool Wear in AC3A Dry Cutting,. ...

This applet presents a visualization of the albedo of the earth. It is one of a series for a textbook. Users can adjust the speed of the visualization.

... between the speed of adjustment of income to changes ... MATHEMATICAL MODELS, SENSITIVITY, EMPLOYMENT, DISTRIBUTION(ECONOMICS). ...

DoublyFed Induction Generator (variable speed) Plant Feeders ac dc partial power dc ac Type 4 10 generator full power ac to dc dc to ac Fullconverter interface #12;2. What is a wind plant? Type 3 Doubly Fed/3 of full power rating � Eliminates wind gustinduced power spikes � More efficient ...

... of these chambers, and by using a circulated oil bath as the ... SPEED TRANSFORMER ... are devices similar to ordinary ac transformers, the essential ...

Contents: High-Performance GTO PWM Inverters; Variable-Speed AC Drive for Industrial Use; Application of Variable-Speed AC Drive to Steel Plants; Application of Variable-Speed AC Drive to Synthetic Fiber and Film Plants; Present Status and Prospects for V...

Advances in speed control for motors in recent years, notably those in power electronics, have widened the range of application for several adjustable speed drive (ASD) types to include the smaller horsepower sizes. The DC motor drive, formerly in almost ...

An energy efficient drive system has apparatus for determining the load power, load speed, and necessary adjustment of the drive system to obtain a minimum brake specific energy consumption. The drive system includes structure for adjusting the drive in accordance with the determined adjustment. In one form, the ...

An energy efficient drive system having apparatus for determining the load power, load speed, and necessary adjustment of the drive system to obtain a minimum brake specific energy consumption. The drive system includes structure for adjusting the drive in accordance with the determined adjustment. In one form, the ...

This paper evaluates the performance of a variable-speed ac, superconducting motor. A novel axial-gap geometry was chosen for four-pole, 1800-rpm operation, using a superconducting stator and normal armature. The pool-boiling cryostat contains four solenoidal field windings of filamentary niobium-titanium conductor and has a maximum field of 7 T and an ...

A welding machine is described that employs the argon shielded a-c tungsten-arc process. The machine has so far met all the demands made upon it and although the work to date has been confined to magnesium alloys, the machine is ideally suited to welding tubular fuel can assemblies for advanced reactors or other tubular components of a similar nature. In addition, ...

The commercially available finite element code ANSYS has been adapted to solve the critical state of single strips and multifilamentary tapes. We studied a special algorithm which approaches the critical state by an iterative adjustment of the material resistivity. Then, we proved its validity by comparing the results obtained for a thin strip to the Brand theory for the ...

A high precision controller for an alternating-current multi-phase electrical motor that is subject to a large inertial load. The controller was developed for controlling, in a neutron chopper system, a heavy spinning rotor that must be rotated in phase-locked synchronism with a reference pulse train that is representative of an ac power supply signal having a meandering line ...

When firms are faced with a demand shock, adjustment can take many forms. Firms can adjust physical capital, human capital, or both. The speed of adjustment may differ as well: costs of adjustment, the type of shock, the legal and economic enviroment all ...

... path to obstacle and avoid collision while adjusting speed appropriately; 4. Maintain these top speeds: Off-Road Flat�40 MPH, Highway�55 MPH ...

... Wind speeds adjusted to 10 m at many moored ... in different regions of the global ocean further ... the accuracy of monthly NWP winds, giving RMS ...

... Wind speeds adjusted to 10 m at many moored ... in different regions of the global ocean further ... the accuracy of monthly NWP winds, giving RMS ...

The reluctance interior permanent magnet (RIPM) motor is currently used by many leading auto manufacturers for hybrid vehicles. The power density for this type of motor is high compared with that of induction motors and switched reluctance motors. The primary drawback of the RIPM motor is the permanent magnet (PM) because during high-speed operation, the fixed PM produces a ...

In a particle accelerator of the type employing ac primary power and a voltage multiplication apparatus to achieve the required high dc accelerating voltage, a filament supply circuit is powered by a portion of the ac primary power appearing at the last stage of the voltage multiplier. This ac power is applied across a voltage ...

This TechData Sheet is intended to help activity personnel identify cost effective energy projects for energy projects for Adjustable Speed Drives (ASDs). With this guide an energy manager can identify when an ASD is applicable and do a first-run evaluati...

An application of high speed reclosing for UHV a.c transmission lines is expected to secure high reliability of transmission system. In order to choose dead times of high speed reclosing property, it is necessary to clarify forced extinction characteristi...

A test plan for evaluation of the performance characteristics of an axial-air-gap, variable-speed ac superconducting motor is presented in this report. A complete description of the electrical and mechanical apparatus and the instrumentation requirements is provided. Static and dynamic testing of the motor will enable comparison of a motor performance as a ...

Several superconducting AC machine concepts were studied for ship propulsion applications. These concepts evolved from previous work at MIT on superconducting AC machines. The superconducting machines considered were: (1) multipole, low-speed motors, (2) ...

An ac motor controller for an induction motor electric vehicle drive system was designed, fabricated, tested, evaluated, and cost analyzed. A vehicle performance analysis was done to establish the vehicle tractive effort-speed requirements. These requirem...

A repulsive type AC-electromagnetic bearing was developed and tested. It was conceived on the basis of the so-called Magnetic River suspension for high-speed trains. The appearance of the bearing is similar to the traditional DC-type electromagnetic beari...

A variable frequency inverter is described for driving an ac induction motor which varies the frequency and voltage to the motor windings in response to varying torque requirements for the motor so that the applied voltage amplitude and frequency are of o...

... the Bordeaux zone PM2000 catalog with block-adjustment-type reductions of early (AC, Carte du Ciel) and new (scanning CCD) observations of ...

... consider assessment of variable speed drives in the ... The addition of adjustable T5 fixtures will provide ... Better scheduling procedures can save a lot ...

The user fires a gun with the purpose of hitting a target. Launch speed and angle as well as initial target velocity and postion may be adjusted.

This is one in a series of tip sheets to help manufacturers optimize their industrial motor and motor-driven systems.

This is one in a series of tip sheets to help manufacturers optimize their industrial motor and motor-driven systems.

... such filters by means of high-speed digital computation of ... a new approach to the design of generalized filters. ... in the case of a matched filter, it has a ...

This is one in a series of tip sheets to help manufacturers optimize their industrial motor and motor-driven systems.

... Engineering Research Laboratories (USACERL) is developing ASDAPLUS, a personal computer PC-based software package, to automate the ...

A new quasi current resonant dc link (QCRDCL) topology has been developed in this paper. Although prototype current resonant dc link topologies for ac/ac power conversion have had such problems as irregular high current peaks, uncontrollable pulse width, etc., this new topology enables the ac/ac conversion system to have the properties wherein the current ...

This paper proposes a new magnetic levitation scheme which is able to generate levitation force for all speeds including a standstill. Auxiliary wheels which are needed in EDS MAGLEV vehicle can be eliminated. This scheme uses AC superconducting magnets to generate levitation force. In this paper, magnetic fields, forces and power dissipations generated by ...

A Robust 18-PulseRectifier for Adjustable Speed Drive Systems. *E.Aeloiza *Y.Durrani ** M. Rayner rectifiers have been lately utilized to improve the input current distortion in Adjustable Speed Drive (ASD of an 18-pulse rectifier and an Active Power Filter (APF) to improve the input current distortion in ASD

Most large electric motors run at a nearly constant speed, although the devices they drive particularly pumps, fans, or blowers are often used to meet loads that vary over time. Adjustable speed drive (ASD) technologies have the ability to precisely control output speed and produce a number of benefits including ...

(a) The entitlements established by 11 CFR 9008.4 shall be adjusted on the basis of the Consumer Price Index pursuant to the provisions of 2 U.S.C. 441a(c). (b) The entitlements established by 11 CFR...

This patent describes an electronic governor for an internal combustion engine provided with a fuel injection pump for supplying fuel to the engine and having a control rack for adjusting fuel injection amount. The electronic governor comprises: means providing an accelerator position signal Vs indicative of the desired speed No of the combustion engine; ...

The incident wave forces the surface disturbance to travel at a specified speed. An independent approach can also be made by setting a = 0 in ...

... netic Gun Program under which a compact homopolar generator (HPG) was ... 2 MA HPG that is driven with a variable speed AC-induction motor drive ...

... Uchida and Mainen (2003) trained rats to discriminate two pure odorants and their mixtures in a two alternative choice (2AC) reac- tion time ...

... same ac response time which limits the high speed performance of such ... MS Rzchowski, MT Tuominen, JU Free, and M. Tinkham, "Prop- erties of ...

... The rectifier may be connected through a short ... ac output voltages and currents is on ... fast transients are involved in current commutation between ...

... at three rotation speeds (600,1200 and 1800 rpm), using electrochemical small amplitude cyclic voltammetry and AC impedance techniques. ...

These model repair specifications list the minimum requirements for repair and overhaul of polyphase AC squireel cage induction motors. All power ranges, voltages, and speeds of squirrel cage motors are covered.

... microstirring is a tool that can be incorporated in existing devices, to speed up, for example, food-borne pathogen detection, or portable medical ...

The invention relates to the area of conversion equipment that can be used, in particular, to regulate the rotating speed of ac electric motors or in planning sources of stable frequency.

... I nhe dieitaii screen shows all sensor data including the AC motor speed, current, voltage and power and rate .of oil lubrication to the compression ...

A superconduction power storage apparatus includes a superconduction coil for storage and release of electrical energy, and a separately excited thyristor conversion unit having d.c. terminals connected to the said superconduction coil and a.c. terminals connected to an a.c. power source. The conversion unit is arranged so as to convert the electrical ...

The overall efficiency of an ac electrically-driven fuel booster pump over a wide range of frequency has been reported in a general performance study. To find the effect of speed on the efficiency of the pump itself, the input-output characteristics of th...

The report discusses the development of a fuzzy logic, energy-optimizing controller to improve the efficiency of motor/drive combinations that operate at varying loads and speeds. his energy optimizer is complemented by a sensorless speed controller that maintains motor shaft rev...

The report discusses the development of a fuzzy logic, energy-optimizing controller to improve the efficiency of motor/drive combinations that operate at varying loads and speeds. This energy optimizer is complemented by a sensorless speed controller that maintains motor shaft re...

(center) position produces zero speed and sets the brakes. ...... Provides magnetic coupling between constant speed AC motor and. Cable Reel Spool. Fails open ...... MLWS, silencing lower block radio transmitter. Fails Open ...

Electric motor manufacturers are marketing electronically controlled, direct current (dc), brushless motors that can be as much as 60% more efficient than alternating current (ac) motors when they are running at reduced speeds. The electronic controls vary the actual current in reduced-speed applications rather than varying the ...

A method of arc welding a base metal with electrodes, the method is described comprising the steps of: providing electrodes E[sub DC], E[sub AC1], E[sub AC2], and E[sub AC3]; aligning the electrodes E[sub DC], E[sub AC1], E[sub AC2], and E[sub AC3] in a row from front to ...

Algebraic Foundation of Self Adjusting Switched Capacitors Converters Sam Ben-Yaakov Senior Member-Gurion University of the Negev P.O. Box 653, Beer-Sheva, 84105 Israel sby@ee.bgu.ac.il Website: www.ee.bgu.ac Engineering Ben-Gurion University of the Negev P.O. Box 653, Beer-Sheva, 84105 Israel kushnero@ee.bgu.ac

A power factor analysis of the input part of an advanced AC/DC/AC converter for variable speed wind turbines is presented. Two types of rectifying input converters are compared: the boost rectifier, consisting of three AC inductors, a three-phase diode br...

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 3.4 ABAQUS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 3.5 Troubleshooting to the size and speed of the resulting application. 3.4 ABAQUS See the ABAQUS help page 5 for details. 3 4 http://www�h.eng.cam.ac.uk/help/tpl/programs/matlab.html 5 ...

The design, realization and testing of a servo drive with an asynchronous machine (an ac servo drive) were studied. The asynchronous machine is described by a mathematical model using space vectors. Based on this model, a digital field-oriented speed cont...

The paper describes briefly the following components of hydrogen-electric power drives: chilled hydrogen gas tank, liquid oxygen tank, fuel cell bank, dc/ac converter, ac drive motors, solid-state ac speed control, dc sputter-ion vacuum pumps, steam turbine generator, and steam condenser. Uses for the process steam ...

This paper discusses the characteristics of the concept and includes discussion of the system constraints, including traction battery constraints, and brief descriptions of the major subsystems being developed. The components discussed include: the system controller, dc to ac inverter, an internal permanent magnet ac motor and a ...

Commutators? a) Synchronous motor: Connect a solenoid to the screws on the base of a step- down transformer with the reversals in direction of the AC current, this is called a synchronous motor. b) Universal motor are AC, and from a synchronous AC motor. The synchronous motor in part a) provided only one rotational ...

In electrical power distribution and power electronic applications, a transformer is an indispensable component which performs many functions. At its operating frequency (60/50 Hz), it is one of the most bulky and expensive components. The concept of the electronic transformer introduced previously has shown considerable reduction in size, weight, and volume by operating at a higher frequency. In ...

by formally qualified and certified educators will result in higher retention rates, better trained studentsAC 2009-2538: STRENGTHENING THE PERFORMANCE OF ENGINEERING AND TECHNOLOGY EDUCATORS ACROSS THE DISCIPLINES (SPEED) J. P. Mohsen, University of Louisville � American Society for Engineering Education, 2009

An idle speed control system is described for an internal combustion engine having a fuel delivery means for supplying fuel to the engine, the idle speed control system comprising in combination: means for controlling the fuel delivery means to supply a scheduled idle fuel quantity during a idle operating state of the engine; means for sensing the engine ...

The authors have suggested a process for the simultaneous removal of dusts and gaseous pollutants. Characteristics of the partial discharge in a ferro electric pellet layer have been studied using ac voltages with varying frequency or using square wave voltages. The capacitance of the layer, Ct, consists of the capacitance of each ferroelectric pellet, Cp, and the capacitance ...

This invention relates to a power supply system having the capability of furnishing to a load sensitive to electrical faults and interruptions, electrical power for prolonged periods of time after a utility or other external power supply source thereto is interrupted. The system comprises a main A.C. generator furnishing A.C. potential at a selected ...

Petroleum and chemical plants of today are effectively cutting energy losses in their plants thermally, electrically, and mechanically in their process equipment. In rotating process equipment such as pumps, fans, compressors, and blowers, much mechanical or fluid energy is being dissipated or thrown away by throttling valves, dampers, and adjustable guide vanes. ...

An apparatus is described for automatically limiting the speed of a vehicle powered by an internal combustion engine having a spark ignition system with an ignition coil, comprising: sensor means for generating a speed signal directly representative of the speed of the vehicle comprising a series of speed signal ...

A permanent split capacitor single phase electric motor achieves balanced operation at more than one operating point by adjusting the voltage supplied to the main and auxiliary windings and adjusting the capacitance in the auxiliary winding circuit. An intermediate voltage tap on an autotransformer supplies voltage to the main winding for low ...

A permanent split capacitor single phase electric motor achieves balanced operation at more than one operating point by adjusting the voltage supplied to the main and auxiliary windings and adjusting the capacitance in the auxiliary winding circuit. An intermediate voltage tap on an autotransformer supplies voltage to the main winding for low ...

A system for performing AC self-test on an integrated circuit that includes a system clock for normal operation is provided. The system includes the system clock, self-test circuitry, a first and second test register to capture and launch test data in response to a sequence of data pulses, and a logic circuit to be tested. The self-test circuitry includes an ...

Variable speed generators have recently become available at a reasonable cost. There has been significant interest in applying this technology to hydroturbines, possibly offsetting the need for adjustable blades or gates. Using variable speed turbines to enhance flow control is investigated theoretically and from similitude ...

A control device for an automatic transmission having a main transmission, a sub transmission connected to an output shaft of the main transmission, and electronic control means for controlling the speed changing ratios of the main and sub transmissions is described. The electronic control means consists of: means for inputting a signal representing a running state of a ...

A suspension system is described for a vehicle comprising a suspension arm connected to the vehicle body by way of a bushing, an adjustment means for changing the resistance of the bushing against a movement in the longitudinal direction of the vehicle body, a steering angle sensor for detecting the turning angle of the steering wheel of the vehicle, a vehicle ...

) by the following procedure: - Remove over speed adjusting bolt's lock wire. - If the over speed trip occurs 27 RPM above 1380 RPM, then turn the Hydramechanical Shutdown Device's "over speed adjusting bolt" one turn counter clockwise. Turn the bolt clockwise if it occurs before 1380 RPM -27 ...

Advances in speed control for motors in recent years, notably those in power electronics, have widened the range of application for several adjustable speed drive (ASD) types to include the smaller horsepower sizes. The dc motor drive, formerly in almost ...

control Model ES-2300RG, which is a regenerative adjustable speed DC motor controller, produced braking DC regenerative drive through an in-line torque sensor. The speed of the motor is monitored through an optical encoder with 1024 pulses/revolution and a frequency counter. The DC regenerative drive

There are many pump and motor installations with quite extensive speed variation, such as Sago conveyor, heating, ventilation and air conditioning (HVAC) and water pumping system. A common solution for these applications is to run several fixed speed motors in parallel, with flow control accomplish by turning the motors on and off. This type of control ...

A speed control apparatus for an internal combustion engine comprises a throttle valve in an intake pipe of the engine, a throttle adjusting element for actuating the throttle valve, and a speed control regulator connected to the throttle adjusting element. The regulator produces a signal representative of the ...

This paper presents a transformerless hybrid active filter that is integrated into medium-voltage adjustable-speed motor drives for fans, pumps, and compressors without regenerative braking. The authors have designed and constructed a three-phase experimental system rated at 400V and 15kW, which is a downscaled model from a feasible 6.6-kV 1-MW motor drive system. This system ...

This brief description of the microcomputer service and maintenance system at Miami Dade Community College/North includes a series of hints, tips, and lists of information sources, suppliers, and regulatory codes that could prove helpful to school districts that wish to conduct on-site repair of computers. These include: (1) cleaning materials suppliers; (2) diagnostic software producers; (3) ...

Previous work has suggested that the degree or extent of coarticulation is more extreme in young children than adults. Research in this area has focused primarily on supralaryngeal aspects of coarticulation, using spectral measures such as formant frequencies and fricative centroids. At the same time, studies of adults have found that laryngeal adjustments for voiceless ...

As part of the Superconducting Super Collider Laboratory (SSCL) funded silicon tracking subsystem R D program, we examine the problems associated with cabling such a system. Different options for the cabling plant are discussed. A silicon microstrip tracking detector for an SSC experiment is an extremely complex system. The system consists of approximately 10{sup 7} detector channels, each of ...

The electrochemical deposition of copper has been a major focus of research for decades. Renewed interest in copper electroplating is not limited to the copper producers but is also a major concern of semiconductor manufacturers. The focus on copper electrochemistry by the semiconductor manufacturers has increased since IBM's announcement in 1997 that copper will be used for metallization in high ...

The application of AC-electric fields, when integrated with current microarray and ``lab-on-chip'' platforms, has emerged as a useful tool to manipulate and assemble supramolecular aggregates, such as AC-field induced protein crystallization and DNA hybridization, yet the detailed mechanism remains unclear. To understand the ...

We report on the study of indirect excitons in moving lattices--conveyers--created by a set of AC voltages applied to the electrodes on the sample surface. The wavelength of this moving lattice is set by the electrode periodicity, the amplitude is controlled by the applied voltage and the speed is controlled by the AC frequency. We ...

This patent describes a method of controlling the idling speed of an internal combustion engine comprising the steps of: establishing a desired idle speed; sensing the actual engine idle speed; generating an engine idle speed error signal in proportion to the difference between the desired engine idle ...

This report assesses objectives and issues of variable rotor speed in wind turbines. It deals primarily with electrical solutions, in particular variable speed ac drives. The primary benefits, improved aerodynamic efficiency and greater operational flexibility are analyzed. The former is achieved by varying rotor tip ...

Four specific areas were covered: (1) Gas corrosion and soil sand abrasion of hydroelectric turbines. (2) The areas of safeguard adjustment calculations and speed adjusting systems in hydroelectric turbines. (3) The areas of the techniques of ventilation ...

In this work, the authors suggest the use of numerical optimization for on-line adjustment of the exciting period in electronic damping of a stepping motor. The simplex method, which consists of some simple procedures only, is adopted as the optimization technique. In the process of adjustment, a speed sensor is used instead of a ...

A speed control unit is described for controlling the actual speed of a vehicle at a desired speed, the vehicle including an engine having a throttle movable in two directions to increase and decrease the speed of the vehicle, comprising: means for generating a signal representing the desired ...

High speed polishing is a polishing process which, unlike conventional polishing, requires neither tool adjustment during the polishing cycle nor frequent tool and machine-stroke corrections. Such a process should be very consistent. In order to achieve t...

This patent describes apparatus for generating an ignition enabling signal for use with a given combustion turbine, wherein a turbine speed signal is given and wherein the combustion turbine includes ignition means for igniting the turbine in response to an ignition enabling signal. It comprises: sensor means for sensing the temperature of ambient air and for generating an ...

of the gyroscopes, and the other is in non-rotating status. The rotating speed of the gyroscope can be adjusted speed of the gyroscope without adding an external measurement system in the vacuum chamber. The rotating-spin interaction between a rotating extended body and the Earth. IV. DISCUSSION A large limitation in our

Sep 20, 1999 ... It's the fan control for the ISS air conditioning system. Instead of adjusting the fan speed -- which affects reliability negatively, ...

and adjustable speed drives Advanced inverter topologies Novel and conventional electric machine technology Permanent magnet Switched reluctance Induction (novel designs...

Apr 21, 2009 ... Myers: Kind of works like a diesel-electric locomotive. Johnny: Sure. ... we can adjust the speed of these propel motors down there. ...

... After the bleed setting ras determined, the resistor control was adjusted for flor. ... differ from the ratio of absolute pressure losses at any piven air-flov ...

... like to thank my love, Debra, and all my family and friends who ... periphery of the laminations house rotor bars with copper conductors shorted at the ...

... uses" in various areas such as industry, agriculture, geology, medical ... low to high speed in trains, and is capable of adjusting to different ...

Plasma Distributions and Anisotropies at Rotational Discontinuities in ... speed adjusted for plasma pressure anisotropy. However, ...

... D PLUS, a personal computer PC-based software package, to automate the analysis required to determine the most cost-effective combination of ...

The coordination of direction and speed of self-motion when intercepting a target moving parallel to the ground plane was examined. Subjects viewed a computer-generated environment comprised of a textured ground plane and a moving target. Turning rate was controlled using a steering wheel and speed was controlled using a foot pedal. It was hypothesized ...

@vos.nagaokaut.ac.jp Abstract This paper describes a design of an ultra-high speed (UHS) permanent-magnet (PM) synchronous motor. Permeance coefficient and motor efficiency Figure 1 illustrates the configuration of the UHS SPM synchronous-high speed permanent-magnet synchronous motor for a supercharger mounted on an automotive engine

The report describes the results of speed-studies on salted and unsalted roads. The results show that drivers adjust the speed according to the driving conditions (due to friction of the road surface). The level of speed on roads where salt is applied is ...

Developed and applied to the WCOBRA/TRAC code for speed up is an implicit numerical method with an iterative solution scheme of semi-implicit format. For a sample problem of sub-cooled liquid, computation speed was increased by a factor of 2 to 3 or more. For problems involving phase transition and heat transfer, other techniques of iteration control, ...

...airplanes, the test day speeds and the acoustic day reference speed are the minimum...test day speeds must be corrected to the acoustic day reference speed. (5) The...in appendix A of this part. (c) Acoustic data must be adjusted to the...

Recent advances in speed control of ac motors are making it possible to replace dc motors by ac motors. The most important state variable of ac motor used for speed control is the torque. Synchronous motors are used as speed control motors although the theory for their ...

Carbon nanotube (CNT) has excellent field emission characteristics and could play as a good cold cathode in the application of vacuum electronic devices. However, the practical application faces a big obstacle regarding current fluctuation and deterioration of the CNT cathode. In this research, the formation of amorphous carbon (ac) layer between the CNT film and the ...

The study first presents the historical background and an overview of the technical basis for Oregon's current method of statistical quality control. It then evaluates the benefits that the State of Oregon receives by paying out bonuses to contractors on ...

The purpose of this supplement is to authorize adjustment of the fuel loading to maintain a balanced longitudinal flux distribution in the region loaded for this Production Test.

hardware failure which will require repair. .... ed display will result if the scope is ac coupled. ..... 1) Set the pulse generator to square wave, 4V amplitude, frequency to 10 kHz. ...... The op amp, U404 adjusts the drain current in ...

Progress in a program for evaluating underground dc transmission systems is reported. A representation of a futuristic development of a large ac power system was used for a basic load flow model. This model will be adjusted to produce three representation...

An alternating current power generation system adopted to inject power in an already powered power line is discussed. The power generating system solves to adjustably coup an induction motor, as a generator, to an ac power line wherein the motor and power...

The objective of this research is to develop statistically based acceptance/rejection plans and payment adjustment schedules for five specifications covered under the Federal Aviation Administration (FAA) Advisory Circular (AC) No. 150/5370/10, Standards ...

The patent is an improved electronic alarm relay for monitoring the current drawn by an AC motor or other electrical load. The circuitry includes operational amplifiers for generating an output voltage which changes polarity when the current being monitor...

... FD AC a le nda r Y ear FollowUp Adjustment (SRS only) *Non-Serious Periodic (non-AERS) Periodic Expedited medwatch Direct AER S SR S Page 5. ...

This patent describes a system connected to the throttle of an engine for maintaining a vehicle at a predetermined speed. The engine has an ignition coil: means for providing a signal corresponding to the actual speed of the vehicle, means for providing a reference signal corresponding to the desired speed of the vehicle, means ...

We have designed and constructed a new type of spectroscopic ellipsometer to study the optical properties of materials in the 3500-8000-� wavelength range. In the system, the analyzer and polarizer are driven 10(4) steps/revolution by two stepping motors that have hollow shafts and rotate synchronously with a speed ratio of 2:1, i.e., A = 2P. Both the polarizer and analyzer ...

Paired blood and breath alcohol concentrations (BAC, in g/dL, and BrAC, in g/210 L), were determined for 11,837 drivers apprehended by the New Zealand Police. For each driver, duplicate BAC measurements were made using headspace gas chromatography and duplicate BrAC measurements were made with either Intoxilyzer 5000, Seres 679T or Seres 679ENZ Ethylometre ...

Self-assembly of magnetic microparticles in AC magnetic fields. Excitation of the system by an AC magnetic field provides a variety of patterns that can be controlled by adjusting the frequency and the amplitude of the field. At low particle densities the low-frequency magnetic excitation favors cluster phase formation, while high ...

This is a downloadable complex AC circuit simulation with a voltage source and a reactive load. Users can adjust the voltage, load resistance, capacitance, and inductance and see the resulting change in the current. Users are challenged to figure out what conditions and settings result in the most power being delivered. This software would be useful for ...

A line- and load-regulated constant-current ac shock generator has been designed for animal behavior experiments. The self-contained unit has four operating modes, amplitude adjustment, and a leakage current detection circuit. A unique feature of this gen...

A line- and load-regulated constant-current ac shock generator has been designed for animal behavior experiments. The self-contained unit has four operating modes, amplitude adjustment, and a leakage current detection circuit. A unique feature of this generator is that the good l...

Early wind turbines used for performing mechanical work (pumping, grinding and cutting) optimized aerodynamics by being allowed to run at variable speed. Some of the earliest DC electric wind turbines were allowed to run at variable speed. With the advent of grid-connected AC turbines, rotational speeds were ...

Variable structure control systems are characterized and a continuous real-time demonstration of the speed control of a dc motor using a variable structure design is described. A variable structure design for ac drives is also addressed. Problems with var...

The transient stability of an a. c. generator is analyzed by utilizing Lyapunov's direct method. Lyapunov functions are developed which include the effects of flux decay and simplified representation of speed governor and voltage regulator. It is shown th...

... Page 14. Information: Network Topology � 'As-Is' � 'To-Be' � T ij Time to fly from the ith APOE to the jth APOD � T ij = f (distance, A/C speed) ...

The paper reviews the development of electrical machines of the reluctance type over the past twenty years. Reluctance machines are grouped into two broad categories, viz the AC reluctance machine with magnetically coupled stator phases, and the DC, or sw...

An AC tracking system for motor speed stabilization is described. The system useds tachometer generators on the shaft of the motor as sources of control signals with an adder and reversing and non-reversing amplifiers as signal processors. The system yiel...

The design of a portable Digital Pressure Indicator (DPI) to be used for calibrating the pressure systems on Langley's magnetic tape recorders is described. High-speed magnetic tape recorders require pressure (0 to 20 psig) for providing an air cushion ac...

NASA TN D-8264. A HIGH ... TN D-8260) on the aero- dynamic .... AC D. C L induced drag coefficient incremental drag coefficient,. Lift ...... TN D-5729,. 1970. 8. ...

The noise generated by supersonic tip speed propellers may be a cabin environment problem for future propeller-driven airplanes. Active suppression from speakers inside the airplane cabin has been proposed for canceling out this noise. The potential of ac...

Computer models of AC generators have been developed, but they are cumbersome, complicated, and lengthy. Reducing the complexity while retaining sufficient accuracy would reduce the cost of the model, thereby reducing the test and development costs. High ...

The Stokes method provides a seminal method for the determination of a state of polarization of a beam of light using measurable quantities. This paper presents a methodology for the rapid acquisition of the four Stokes parameters. We have been able to ac...

Partial Contents: Novel Technologies for Power Conversion Circuits; Large-Capacity, Variable-Speed AC Drive; Present Status and Prospects for General-Purpose Inverters and Servo Systems; Downsizing Technology for General-Purpose Inverters; Applications of...

... s me+ A'+ a -. 5 0 1 aer a a+A01+ ac + 0 "dr" aa+A,+ no ... quired are as follows (rote that erw$ Aer derived section coefficients sam emlOYed here): ...

Page 1. .. 'AD624413fteo CONTACT P?.QLIREMENTS CO T".A( T ITEM , IE- , )%TkAC I N.. r A1 REPORT NO. _ _R-_- _ DAI E Aug. 26, 1963 ...

... It can be triggered by a 90 V pulse or by the application of a short circuit anti is capable of initiating up to 30 PF300 flashbulbs. AcTf i NTIS Wi. IAe> ...

This citation summarizes a one-page announcement of technology available for utilization. The processing of information by a distributed network of computers proceeds much more efficiently if the network is linked by a time-shared data buffer (memory), ac...

The operating characteristics of large diameter rolling-element bearings in the ultra high speed regimes expected in advanced turbine engines for high performance aircraft were investigated. A high temperature lubricant, DuPont Krytox 143 AC, was evaluate...

This paper proposes a speed servo system based on a space voltage vector modulation (SVM) inverter with the mixed voltage limitation method considering acceleration torque and voltage saturation for AC servo motor. The servo system realizes both a quick speed response and a small value of total harmonic distortion (THD) in steady ...

A method and system for performing AC self-test on an integrated circuit that includes a system clock for use during normal operation are provided. The method includes applying a long data capture pulse to a first test register in response to the system clock, applying an at speed data launch pulse to the first test register in response to the system ...

A system is described for automatically controlling a speed of an automotive vehicle, comprising: (a) first means for detecting whether another vehicle is moving within a predetermined detectable range in the same direction as the controlled vehicle; (b) second means for adjusting the controlled vehicle speed toward a manually set ...

This patent describes an intake flow rate control system for an internal combustion engine comprising: a manually operable speed demand input means for producing a speed demand indicative signal having a value varying according to preset variation characteristics in accordance with manual operation; a manually operable mode selector for selecting one of ...

A vehicle speed controlling apparatus is described for controlling the speed of an internal combustion engine with PID control to maintain the speed of a vehicle driven by the internal combustion engine at a desired target vehicle speed. The apparatus consists of: means for generating a first signal indicative of ...

motors (that is, motors with lower energy losses). In October 1973, oil embargoes of petroleum such as energy-efficient motors, adjustable-speed drives, and improved-efficiency lighting will be the key to motors and lighting. The primary focus is on energy-efficient motors, adjustable-speed drives

Developments in digital electronics and power semiconductors have led to a rapid increase in the use of nonlinear devices including adjustable speed drives. For this reason harmonics have become a common problem in many industrial electrical systems. The importance of a complete power system analysis prior to the installation of new equipment will be ...

This impact evaluation of an adjustable speed drive that was recently installed at Ball-InCon Glass Packaging Corporation (Ball-InCon) was conducted for the Bonneville Power Administration (Bonneville) as part of an evaluation of its Energy $avings Plan (...

instantaneous dc bus voltage and ( )tidc is the measured instantaneous current, flowing through the electrolytic have been carried out. The first one is to measure ESR of several electrolytic capacitors using the LCRA Real Time Method to Estimate Electrolytic Capacitor Condition in PWM Adjustable Speed Drives

This study builds on a previous research on homogenization of Canadian monthly mean wind speeds. To meet the needs for homogenized higher-resolution (hourly or daily) wind speed data, this study adapted a newly developed adjustment method, a quantile matching (QM) algorithm for non-negative data, to adjust hourly ...

Partial Contents: Ball Screw Nut Direct Driving AC Servo Motor; Ultralow Speed Servo System; Absolute System (Encoder and Driver); Economy-Type Low Noise Inverter DV-651 Series; Industrial Sewing Machine 'Pana-Servo AC' C Series; Circuit-Combination Type ...

Contact Theta Chi Single Occupancy $500 Parking, all utilities, free laundry, a/c, cable, and both, vanity, desk, closet Open kitchen A/C, free laundry, cable/internet Free off-street parking Beta Sigma connection Theta Xi $450 All utilities, high speed internet, phone, free laundry $150 Damage & Security

-Jin Choi, Hyung-Myung Kim * Department of Electrical Engineering and Computer Science, Korea Advanced@csplab.kaist.ac.kr (Y.-J. Choi), hmkim@ csplab.kaist.ac.kr (H.-M. Kim). www.elsevier.com/locate/comcom Computer] and the references therein). In [28], Kurose introduced a statistical traffic envelope, which is de- fined

controllers can be designed, such as the ac�synchronous motor and, most importantly, the ac�induction motor optimal control as a function of vehicle speed. By assuming the motor to be operating at steady motor optimal control problem may be formulated by including a model of the machine dynamics. An example