Drives and controls

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  • Electric motors convert electrical energy into mechanical energy by utilizing the properties of electromagnetic energy conversion. The different types of motors operate in different ways and have different methods of calculating the performance, but all utilize some arrangement of magnetic fields. Understanding the concepts of electromagnetics and the systems of units that are employed is essential to understanding electric motor operation.The first part of this chapter covers the concepts and units and shows how forces are developed.

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  • D.C. motors General Fundamental equations and performance Wound-field motors Permanent-magnet motors Operating principles Commutation Rotation Compensation D.C. PM commutation Construction of the D.C. motor D.C. motor frame D.C. motor armature Brush gear Mountings D.C. PM design Rotor inertia Permanent-magnet materials 2 A.C. induction motors General Fundamental equations and performance Electrical characteristics of induction motors Torque characteristics Voltage-frequency relationship Increased voltage Reduced frequency Slip-ring induction motor Speed-changing motors A.C.

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  • Industrial robots are currently employed in a large number of applications and are available with a wide range of configurations, drive systems, physical sizes and payloads. However, the numbers in service throughout the world are much less than predicted over twenty years ago (Engelberger 1980). This is despite major technological advances in related areas of computing and electronics, and the availability of fast, reliable and low-cost microprocessors and memory. This situation is mainly a result of historical and economic circumstances, rather than technical considerations.

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  • The accuracy of a machined part depends on the precision motion delivered by a machine tool under static, dynamic, and thermal loads. The accuracy is evaluated by measuring the discrepancy between the desired part dimensions identified on a part drawing and the actual part achieved after machining operations.

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  • Just under a third (31%) of overall activity in this sector is in manufacturing, with the highest levels of  manufacturing  in  the Wind  and  Carbon  Capture  &  Storage  sectors ‐  the  latter  a  reflection  of  the  current drive to prove the technology through pilot projects.

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  • This increased level of risk among young men is not confined to driving. The WHO (1999) and (2002) report that men are also more likely to die from falls, drowning, poisoning and a range of other events. Only in the case of deaths in fires are women slightly more over-represented than men. The report also notes that injury and fatality rates are higher among men for every type of road injury victim in several developing countries. In Kampala, Uganda, for example, males outnumbered females by between 2 and 7 to 1 among injured vehicle drivers, passengers and pedestrians. In the...

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  • Long-term challenges remain: continuing with structural reforms, maintaining rapid and steady economic growth and fiscal discipline, boosting employment, reining in the informal economy, and making progress with respect to EU accession. While the latter is expected to be a long and complicated process, it will remain a driving force for Turkey’s reform efforts. In addition, accelerating the reform process will be vital for a positive outlook. Recent political turmoil and upcoming local elections in 2009 could become a distraction for further reforms.

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  • The Port Authority would likely benefit from a meaningful organizational redesign to focus on  its  strategic  business  units  and  cost  saving  shared  services  functions.   To  be  successful,  entrusted appointed senior leadership needs effective command and control to manage change  and  drive  accountability  throughout  the  organization.

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  • (BQ) Part 2 book has contents: Journal bearings, belt drives, worm gearing, vibration and control of vibration, cam mechanisms, load cycle analysis, fluid power systems and circuit design, noise and its control, robots and smart machines, deflection,... and other contents.

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  • (BQ) Part 1 book "Mechanisms and mechanical devices" has contents: Basics of mechanisms; motion control systems; industrial robots; mobile scientific, military, and research robots; clutches and brakes; gears: devices, drives, and mechanisms,.... and other contents.

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  • The time is gone when machines, controls, and drives were ‘‘add-ons,’’ as shown in Figure 1. Early machines used add-on drives. These drives had one thing in common: There was no interaction among the control, drive, and machine. To a large extent these machines were open loop. Today’s numerically controlled machines are tightly integrated machine systems. There is a great deal of interaction between the machine, drive, and control. It is this interaction that results in problems with stability, surface finish on the work part, and accuracy.

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  • To their credit, some highway advocates support tolling of added capacity to recover costs and control congestion, but this only addresses two of the external costs of induced travel. Only if all the pricing reforms described above are fully implemented can roadway expansion be justified and efficient.

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  • Since the first edition of Analysis of Electric Machinery was published, the reference frame theory that was detailed in the book has become the universally accepted approach for the analysis of both electric machines and electric drive systems. Now in its second edition, Analysis of Electric Machinery and Drive Systems presents, in one resource, the application of this theory to the analysis, simulation, and design of the complete drive system including the machine, converter, and control.

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  • A modern motion control system typically consists of a motion controller, a motor drive or amplifier, an electric motor, and feed- back sensors. The system might also contain other components such as one or more belt-, ballscrew-, or leadscrew-driven linear guides or axis stages.

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  • Persons supervising and performing the electrical installation or maintenance of a drive and/or an external Option Unit must be suitably qualified and competent in these duties. They should be given the opportunity to study and if necessary to discuss this User Guide before work is started.

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  • -The speed sensor are mounted on the sub axle carriers and receive information from the toothed targets -The targets are fixed on the drive shafts for the front wheels -The front sensors are radial and are not able to be adjusted -The targets are fixed on the bubs(cannot be removed) for the rear wheels -The rear sensor are radial and are not able to be adjusted

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  • An updated approach to reference frame analysis of electric machines and drive systems Since the first edition of Analysis of Electric Machinery was published, the reference frame theory that was detailed in the book has become the universally accepted approach for the analysis of both electric machines and electric drive systems. Now in its second edition, Analysis of Electric Machinery and Drive Systems presents, in one resource, the application of this theory to the analysis, simulation, and design of the complete drive system including the machine, converter, and control....

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  • Magnets are pieces of metal that have the ability to attract other metals. Every magnet has two poles: a north and a south. Much like electrical charges, two similar magnetic poles repel each other; while opposite magnetic poles attract each other. Magnets have a continuous force around them that is known as a magnetic field. This field enables them to attract other metals. Figure 1 illustrates this force using bar and horseshoe magnets.

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  • Power Electronics and Motor Drives including content: introduction and Perspective, power Semiconductor Devices, phase-Controlled Converters and Cycloconverters, voltage-Fed Converters and PWM Techniques, current-Fed Converters, electrical Machines for Variable-Speed Drives, induction Motor Drives, synchronous Motor Drives, computer Simulation and Digital Control.

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  • The use of a combustion engine to motivate a car has been questioned in recent times due to the increasing concern of warming. As a result of this, the concept of driving a car with an electric engine has become of particular interest. Dr. Geoff Walker and his PhD students are working on the creation of the Universitys own electric car. This thesis project is focused on deriving a control scheme to drive an induction machine that could be applied to the electric car.

    pdf93p nguyen4 16-11-2009 125 23   Download

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