Xem 1-20 trên 96 kết quả Motor powered
  • Motivated by the need of energy-efficiency improvements, process optimization, soft-start capability and numerous other environmental benefits, it may be desirable to operate induction motors for many applications at continuously adjustable speeds. The induction motor drives can provide high productivity with energy efficiency in different industrial applications and are the basis for modern automation. This book provides an account of this developing subject through such topics as modelling, noise, control techniques used for high-performance applications and diagnostics....

    pdf0p camchuong_1 04-12-2012 60 11   Download

  • Electric motors provide the driving power for a large and still increasing part of our modern industrial economy. The range of sizes and types of motors is large and the number and diversity of applications continues to expand. The computer on which this book is typed, for example, has several electric motors inside, in the cooling fan and in the disk drives. There is even a little motor that is used to eject the removable disk from its drive. All around us there are electrical devices that move things around. Just about everything in one’s life that whine, whirrs or...

    pdf398p hongphuc1 31-07-2010 234 116   Download

  • Harmonic distortion problems include equipment overheating, motor failures, capacitor failure and inaccurate power metering. The topic of power system harmonics was covered for the first time 20 years ago and the first edition has become a standard reference work in this area. Unprecedented developments in power electronic devices and their integration at all levels in the power system require a new look at the causes and effects of these problems, and the state of hardware and software available for harmonic assessment.

    pdf190p chipmoon 19-07-2012 76 38   Download

  • This book is mainly intended for designers and users of magnetic components in power electronics. It can also be used for didactical purposes. Magnetic components such as inductors and transformers constitute together with the control and the semiconductor components, the main parts in the design of power electronic converters. Some experience teaches that the design of the magnetic parts is still often done by trial and error. This can be explained by a (too) long working-in time for designing inductors and transformers.

    pdf456p nguyenthai_thinh 16-03-2013 75 34   Download

  • I have been undertaking the research and practical applications of power system optimization since the early 1980s. In the early stage of my career, I worked in universities such as Chongqing University (China), Brunel University (UK), National University of Singapore, and Howard University (USA). Since 2000 I have been working for AREVA T & D Inc (USA). When I was a full - time professor at Chongqing University, I wrote a tutorial on power system optimal operation, which I used to teach my senior undergraduate students and postgraduate students in power engineering until 1996.

    pdf623p nguyenthai_thinh 16-03-2013 51 22   Download

  • 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.

    pdf935p minhminhminh32 30-03-2014 178 22   Download

  • Tham khảo sách 'handbook of networks in power systems ii', kỹ thuật - công nghệ, điện - điện tử phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả

    pdf0p nguyenthai_thinh 16-03-2013 34 20   Download

  • The book presents several approaches in the key areas of practice for which the MATLAB software package was used. Topics covered include applications for: -Motors -Power systems -Robots -Vehicles The rapid development of technology impacts all areas. Authors of the book chapters, who are experts in their field, present interesting solutions of their work. The book will familiarize the readers with the solutions and enable the readers to enlarge them by their own research. It will be of great interest to control and electrical engineers and students in the fields of research the book covers....

    pdf0p cucdai_1 15-10-2012 34 15   Download

  • If each voltage is connected to a circuit with the same power factor and the three currents return along the same conductor, then the vector sum of the three return currents is zero. Thus instead of three full sized return cables, only one of smaller size is needed. If none of the load is single phase, then the neutral is not needed at all. High voltage supplies are nearly always three phase without a neutral conductor. There is a great economy in distribution costs if the electricity can be supplied in three phases. ...

    pdf0p namde01 11-04-2013 32 8   Download

  • These power ratings and currents are given for an ambient temperature of 50°C (122°F) at the factory-set switching frequency, used in continuous operation (factory-set switching frequency of 4 kHz for ATV71H 037M3 to D15M3X and 2.5 kHz for ATV71H D18M3X to D45M3X). Above this factory setting, the drive will reduce the switching frequency automatically in the event of excessive temperature rise. For continuous operation above the factory setting, derating must be applied to the nominal drive current in accordance with the curves on page 14.

    pdf49p ducthaobg83 25-09-2012 47 7   Download

  • One way to solve the single phase problem is to build a 2-phase motor, deriving 2-phase power from single phase. This requires a motor with two windings spaced apart 90o electrical, fed with two phases of current displaced 90o in time. This is called a permanent-split capacitor motor in Figure

    ppt22p viet82vp 16-08-2012 41 4   Download

  • In this chapter, we review power electronic converters used in ASDs with induction motors. Various types of rectifiers providing the dc supply voltage for inverters feeding the motors are presented, and we describe voltage source inverters, including three-level and soft-switching inverters, and current source inverters. Control methods for inverters, with a stress on the use of voltage space vectors, are illustrated. Finally, we outline undesirable side effects of the switching operation of power converters.

    pdf38p gaugau1905 09-12-2015 7 1   Download

  • Creation of the Converter, A Case Study DC Motor Drive, Verification of the Design, Improvements on PCB Version,... as the main contents of the document "Design of a Switch-Mode Power Electronic Converter for Teaching Laboratory". Invite you to refer to the lecture content more learning materials and research.

    pdf187p nguyenthai_thinh 13-01-2016 10 1   Download

  • Chapter 1: Industrial motors content presentation D.C. Motors, A.C. Induction motor, A.C. Synchronous motors, brushless servomotors, reluctance motors, A.C. Commutator motors, mechanical and environmental, effectsof semiconductor power converters.

    pdf49p gaugau1905 09-12-2015 4 0   Download

  • The age of electricity began with the work of Hans ChristianOersted (1777-1851), whodemonstratedin 1819 that a current-caving conductor could produce a magnetic field. This was the first time that a relationship between electricity and magnetism had been established. Oersted’s work started a chain of experiments across Europe that culminated in the discovery of electromagnetic induction by Michael Faraday (1791-1867) in 1831.

    pdf40p lyacau 30-12-2009 113 57   Download

  • Brushless DC (BLDC) motors are synchronous motors with permanent magnets on the rotor and armature windings on the stator. Hence, from a construction point of view, they are the inside-out version of DC motors, which have permanent magnets or field windings on the stator and armature windings on the rotor. A typical BLDC motor with 12 stator slots and four poles on the rotor is shown in Fig. 10.1. The most obvious advantage of the

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  • A transmission or gearbox provides speed and torque conversions from a rotating power source to another device using gear ratios, including for a motor vehicle partly because of the limitations of internal combustion engines.Usually found near motors of some sort, gearboxes are used to reduce the load on the motor by using the motor's own momentum to keep it turning.

    ppt71p thanhgiang094 10-05-2011 83 38   Download

  • 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 120 23   Download

  • The microcontroller is an exciting new device in the field of electronics control. It is a complete computer control system on a single chip. microcontrollers include EPROM program memory, user RAM for storing program data, timer circuits, an instruction set, special function registers, power on reset, interrupts, low power consumption and a security bit for software protection. Some microcontrollers like the 16F818/9 devices include on board A to D converters.

    pdf320p nguyenthai_thinh 16-03-2013 56 21   Download

  • Most research in robotics centers on the control and equations of motion for multiple link and multiple degree-of-freedom armed, legged, or propelled systems. A great amount of effort is expended to plot exacting paths for systems built from commercially available motors and motor controllers. Deficiencies in component and subsystem performance are often undetected until the device is well past the initial design stage.

    pdf92p thachcotran 08-02-2010 95 20   Download

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