Power dissipation is ac induction motor is reduced by circuit that lowers applied voltage when motor

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...

... direct simulation of the 2-phase induction motor with and without space harmonics and simulation of a primitive synchronous motor and generator ...

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

The objectives of this program for an improved ac motor controller for battery powered urban electric passenger vehicles were: the design, fabrication, test, evaluation and cost analysis of an engineering model controller for an ac induction motor drive s...

The properties of ac hysteresis loop of a stator tooth in a 5 hp induction motor was measured and analyzed. The load increase on the motor decreased magnetic induction, however increase the minor hysteresis loops in the high induction region. This effect caused increase in ...

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.

... a. AC power supply (3 required) b. AC volt meter c. Calibrated dial d ... 0 d. Record voltmeter reading, e. Check that induction motor and dial rotate ...

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...

The power factor controller (PFC) is a solid state electronic device that reduces excessive energy waste in ac induction motors. The significance of the PFC lies in the fact that nearly a billion induction motors are used daily. The PFC is applicable to both single phase and three phase ...

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...

motor AC motors (synchronous and stepper motors) Induction motors Squirrel cage motors Three phase a synchronous motor. Under a wide range of conditions, the motor will turn at the speed of the magnetic field a ...

A survey of construction possibilities and up-to-date known applications of heat pipes to cool electrical machines is presented. Methods used for cooling electrical machines including gravitational (closed two-phase thermosiphons) heat pipes, rotating coaxial pipes, and capillary pipes are described. Experimental results of an electric motor cooled using coaxial rotating heat ...

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...

... 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 ...

... using silicon controlled rectifiers (SCR) with induction motor loads ... feet away from the ac generator with little ... The choice of three-phase or two-phase ...

... Specific projects involved the permanent magnet synchronous, switch reluctance, induction and DC motors, power electronics devices, including ...

... of the dry disk brake on the induction motor is ... ME AC DC), and the DC generator (ME DC ... DC generators can take three basic forms; a commutated ...

... Accession Number : AD0079898. Title : A 3-PHASE TO 3-PHASE FREQUENCY TRIPLER FOR OPERATING AC INDUCTION MOTORS. ...

AC motors are steadily replacing DC motors in mining and mineral processing equipment, requiring less maintenance. The permanent magnet rotor, or the synchronous motor, has enabled Blador to introduce a line of cooling tower motors. Synchronous motors are soon likely to ...

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 ...

Featuring low maintenance requirements and high durability, a direct-digital-controlled AC servo-motor drive system employing a synchronous motor with a permanent-magnetic rotor as well as an induction motor has been developed. This system attains flexibl...

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 ...

The present invention maintains constant torque in an inverter driven AC induction motor during variations in rotor temperature. It is known that the torque output of a given AC induction motor is dependent upon rotor temperature. At rotor temperatures higher than the ...

This citation summarizes a one-page announcement of technology available for utilization. Two energy-saving technologies tested recently at Marshall Space Flight Center use an induction motor operated in reverse (as an induction generator). In the first, ...

This multimedia tutorial teaches the user concepts about motor operation principles. It concentrates on the following topics: - DC Motors - Brushless DC Motors - Stepper Motors - Switched Reluctance Motors - Brushless AC Motors - AC ...

This volume contains: the TVA act, the 1936 report to the Congress on the unified development of the Tennessee River system, a history of the TVA, generator/motor specifications, and ac induction motor (squirrel-cage type) specifications. (DLC)

This volume contains: the TVA act, the 1936 report to the Congress on the unified development of the Tennessee River system, a history of the TVA, generator/motor specifications, and ac induction motor (squirrel-cage type) specifications. (ERA citation 08...

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...

307 INDEX absorption, 6, 25, 34, 42, 46, 57 absorption bands, 8 AC motors, 217, 226 AC power, 108 array mounting, 233 array sizing, 167 assistance schemes, 171 asynchronous induction motors, 212, 227, 187, 189, 232 boats, 147 bond model, 30 brushless DC motor, 170, 225 ...

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...

This paper presents the details of the Energy Policy Act (EPACT '92) as it pertains to ac induction motor efficiency effective October 24, 1997, along with other motor performance characteristics that are affected. Tables will be provided showing which motor products are affected by ...

The influence of three-phase induction motor loads on a variable-frequency wind electric generator is evaluated. An asynchronous wind electric generator is simulated by a dc motor driving an ac alternator. The output powers an air conditioning unit having a three-phase induction ...

The MOS-Controlled Thyristor (MCT) is emerging as a powerful switch that combines the better characteristics of existing power devices. A study of switching stresses on an MCT switch under zero voltage resonant switching is presented. The MCT is used as a bidirectional switch in an ac/ac pulse density modulated inverter for induction ...

Microgrid voltage collapse often happens when there is a high percentage of low inertia air-conditioning (AC) motors in the power systems. The stalling of the AC motors results in Fault Induced Delayed Voltage Recovery (FIDVR). A hybrid load model including typical building loads, AC ...

The paper discusses the fuzzy logic control (FLC) of electric motors, being investigated under the sponsorship of the U.S. EPA to reduce energy consumption when motors are operated at less than rated speeds and loads. lectric motors use 60% of the electrical energy generated in t...

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 ...

All About Circuits is a website that �provides a series of online textbooks covering electricity and electronics.� Written by Tony R. Kuphaldt, the textbooks available here are wonderful resources for students, teachers, and anyone who is interested in learning more about electronics. This specific section, AC Motors, is the thirteenth ...

of equipment. The power supplies in the lab are capable of delivering very high current. High current can lead and Laboratory Rules Sample Title Page for Lab Reports Lab-1: AC/DC Circuits and Measurements Lab-2: AC Transformers Lab-3: Brushed DC Motors Lab-4: Squirrel-Cage Induction Motors and ...

In the field of ac spindle drives, the induction motor is widely adopted. Synchronous solutions (reluctance, interior permanent magnets) are often suggested to overcome some drawbacks of the induction motor. This paper compares the different options by considering the machine torque-density and ...

A standard, unmodified AC induction motor has its stator winding energized from a sine wave source through a signal-responsive wave modifier operative to control the portion of each cycle of the sine wave which is coupled from said source to the stator winding. An improved motor current demodulator, responsive to ...

To realize a non-contacting conveyance of a steel plate, a combined lift and propulsion system of a steel plate by transverse flux linear induction motors (LIMs) is proposed. By introducing the DC biased AC feeding to the LIM< a steel plate is supported stably and efficiently. In this paper, after showing the advantages of the ...

consisting of a linear analysis, a nonlinear analysis based on a phase plane .... extreme of the saw tooth. The command signal may be modified so that a ...... The ac servomotor is a two-phase induction motor. ...

This issue of Energy Matters focuses on selling an energy-efficient project to management. There are also articles on combined heat and power systems, inspecting steam traps for efficient system, root cause failure analysis on AC induction motors, and performance optimization tips.

... coils of wire each spaced 120° apart. Exciting the stator windings with a three-phase set ... AC Induction [tons] Homopolar [tons] Generator 50.5 51.5 ...

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 ...

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 speed control of ...

The work deals with the design and analysis study for the conceptual design of an economical high efficiency ac motor based on permanent magnets. The design and trade-off studies have covered the material considerations, the design tradeoff options as well as transient and steady state performance considerations, and other options. The baseline comparison ...

The objectives of this program for an improved ac motor controller for battery powered urban electric passenger vehicles were: the design, fabrication, test, evaluation and cost analysis of an engineering model controller for an ac induction motor drive system, the investigation of a power ...

This interactive presentation, created by Terry Bartelt for the Electromechanical Digital Library, discusses the armature action of an AC motor. Bartelt begins by discussing how the armature and stator are pivotal in the conversion of electrical to mechanical energy, the beginning of the entire process. Once this basic explanation is complete, the author ...

Urban rail propulsion systems in use around the world are carefully discussed in this single-source book. It especially spotlights the status of advanced propulsion systems and their electromagnetic compatability characteristics. It presents actual operating experience of transit systems. Systems covered include: Cam controlled and chopper controlled dc drives, inverter controlled ...

The report covers the Phase One effort which is to develop and to test an AC-propulsion system for personal rapid-transit vehicles. This propulsion system incorporates an AC-induction motor in conjuction with an eddy-current clutch and brake. Also include...

... Abstract : A mutual inductance bridge for measuring ac magnetic susceptibility at low frequencies, using standard components, is described. ...

AC loss can be a significant problem for any applications that utilize or produce an AC current or magnetic field, such as an electric machine. The authors investigate the electromagnetic properties of high temperature superconductors with a particular focus on the AC loss in superconducting coils made from YBCO coated conductors for ...

The paper describes three-phase and single-phase induction generators which could be used for converting wind energy to electricity. A safety feature of these systems, in comparison with a.c. or d.c. generators, is that if the power line voltage becomes zero, the voltage of the induction generator instantly becomes zero. Connection of ...

... Accession Number : ADD002784. Title : Induction Motor for Superconducting Synchronous/Asynchronous Motor. Descriptive Note : Patent,. ...

The work described in this paper was sponsored by the Division of Electric Energy Systems (EES) of the US Department of Energy (DOE) through a subcontract with the Power Systems Technology Program at the Oak Ridge National Laboratory (ORNL). The paper summarizes the design and analysis study for the conceptual design of an economical high efficiency ac ...

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, ...

Four wire Wye connected ac power systems exhibit peculiar steady state fault characteristics when the fourth wire of three phase induction motors is connected. The loss of one phase of power source due to a series or shunt fault results in currents higher than anticipated on the remaining two phases. A theoretical approach to compute ...

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

Rheostatic control of dc traction motors has been in use for several decades. With the advent of power electronics, however, more efficient alternate propulsion systems have been developed. These include chopper controls, ac drive with induction motors, systems using onboard energy storage and ...

Defines inductance and explains its cause and effect in an ac circuit illustrates inductive reactance, the factors that affect inductive reactance in an ac circuit, and the phase relationship between current and voltages as a result of the presence of ind...

The video defines inductance and explains its cause and effect in an ac circuit. It illustrates inductive reactance, the factors that affect inductive reactance in an ac circuit, and the phase relationship between current and voltages as a result of the p...