During 19891993 he was as a researcher with the power electronics and electric drives laboratory of helsinki university of technology. Jun 26, 2018 dm vasudevan textbook of biochemistry for medical students, 6th edition free ebook download as pdf file. There is a double connection between the engine and the drive axle. Each chapter of the book is saturated with much needed text supported by neat and selfexplanatory diagrams to. Salient features of the programme 1 name of the programme. We have in mind the possession of certain traits that. Jun 27, 20 electric traction will continue to play a dominant role in the railway since it is an environmentally clean technology compared to diesel traction and also its running cost is low. Some of the technical discussion is based on work that has been reported in a conference publication1. Special features of traction motor, methods of electric brakingplugging rheostatic braking and regenerative braking. Us20080066980a1 direct drive electric traction motor. A traction motor is an electric motor used for propulsion of a vehicle, such as locomotives, electric or hydrogen vehicles, elevators or electric multiple unit traction motors are used in electrically powered rail vehicles electric multiple units and other electric vehicles including electric milk floats, elevators, roller coasters, conveyors, and trolleybuses, as well as vehicles. Although the demand for mechanical variable speed drives has decreased over time, nidecshimpo has been able to leverage the internal traction drive power train into more modern highprecision motion control applications for oems. Technical, market, and team risks are easier to address with traction.
In the past, when conventional thyristors were the only choice, designers opted for current source. The commonly used conventional dc and ac traction drives are. Diploma programme in electronics engineering s pecialization in power electronics 2 duration of the programme. Remote, vvf drives, independent moving pendent, electro hydraulic thruster brake etc. The traction drive required large torque during start and acceleration to accelerate the heavy mass. Department of electrical engineering syllabus for m. Matriculation or equivalent as prescribed by state board of technical education, haryana 4 intake. In these transmissions, power is transmitted in a variety of ways that depend on the rolling friction of bodies in the form of cylinders, cones, balls, rollers, and disks. In a round rotor machine, armature current in phase with field induced emf e f or in quadrature at 90 to e f produces the same flux linkages per ampere as the air gap is uniform so that the armature reaction reactance offered to inphase or.
Drives employing electric motors are known as electric drives. Experimental results show that the proposed method achieves a stateoftheart accuracy with a running speed of 28fps. Massachusetts institute of technology 1 introduction this is a concept paper in response to the foa entitled rare earth alternatives in critical technologies for energy react. Smooth rollers in driving contact avoid the meshlng errors and torque discontinuities of gear mechanisms as the load is passed between mesh ing teeth. If you continue browsing the site, you agree to the use of cookies on this website. Conventional dc and ac traction drives on load transformer. Dm vasudevan textbook of biochemistry for medical students, 6th edition free ebook download as pdf file. The electric traction motor drives the wheels of the vehicle. Traction drives are particularly well suited to satisfy these requirements. The main features of the proposed drive system are the capability to generate high. Traction systems broadly speaking, all traction systems may be classified into two categories. To evaluate the proposed method, we construct a new dataset of 2,019 nature images with cosaliency in each image. Parameter details 1 gauge nominal 1435mm 2 traction system 2.
Although the demand for mechanical variable speed drives has decreased over time, nidecshimpo has been able to leverage the internal traction drive power train into more modern highprecision. Fundraising, hiring, press, partnerships and ac quisitions are all easier with traction. Unlike a traditional vehicle, where the engine must ramp up before full torque can be provided, an electric motor provides full torque at low speeds. The salient features of stator voltage control method are. The dc motor suffers also from a construction limit, commutator and brushed. Trv resistors are high power, forced air cooled resistors, suitable to be used in harsh environments. Sustained growth driven by strong pet food performance. Since 1993 he has worked with abb in various research positions dealing with torsional vibration damping, converter control, simulations and wind. Comparative study for machine candidates for high speed.
These direct techniques are known to be friendly to keep. Speed time curves for different services trapezoidal and quadrilateral speed time curves. A direct drive traction vehicle motor system for a wheeled vehicle includes an electric motor rotor for mechanically attachment to a vehicle wheel for rotational movement with the vehicle wheel. A drive based on a wound rotor synchronous machine wrsm is proposed as traction system of electric vehicle.
Jun 30, 2014 explanation of our traction drive and current application. Solid state controlled electric driveconcept, elements and salient features, power converter motor system, closed loop control of electric drives, sensing of speed and current, performance. Traction drives can be broadly classified into variablespeed ratio drives and fixedspeed ratio drives. Experimental results show that the proposed method achieves a state of theart accuracy with a running speed of 28fps.
State the main requirements for an ideal traction system. The dc traction drives employing resistance control are. An attachment structure is concentrically mounting the rotor to the vehicle wheel. This ppt helps to understand the concept of electric traction slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. The results of a test program to evaluate a compact, high performance, fixedratio traction drive are presented. The slip power recovery scheme also plays a proactive role as there can be substantial savings of energy in case of a wound rotor induction motor as the slip power recovered can be used to drive. Review of existing electric traction systems in india. When we think about the moral what comes to mind are certain dispositions to do the right thing at the right time for the right reason. Rajput this book on utilisation of electrical power including electrical drives and electric traction has been written for students preparing for b. Sep 29, 2009 this ppt helps to understand the concept of electric traction slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. Mar 02, 2020 7 headlines results for the six months ended december 2019 december 2019 underlying ebitda margin per business unit underlying ebitda margin summary dec 2019 2018 2017 7. Traction drive system and its characteristics as power.
Developed powers are converted directly into thrust without losing a fraction in the conversion from rotational into translational energy. Salient pole synchronous generator power angle curve. Evaluation of a higft performance fixed ratio traction drive. Pyramid feature attention network for saliency detection. The dc traction drives employing resistance control. Introduction to basic notions on electric power 5 electric current conductor lines of force fig. The book provides accessible, studentfriendly coverage of dc machines, transformers, threephase induction motor, singlephase induction motor, fractional horsepower motors, and synchronous machines. This split power path allows interconnecting mechanical and electrical power, at some cost in complexity. Electric traction services, duty cycle of traction drives, calculations of drive rating and energy. This transmission, the nasvytis multiroller traction drive, is a fixedratio, singlestage planetary with two rows of stepped planetrollers. Solid state controlled electric driveconcept, elements and salient features, power converter motor system, closed loop control of electric drives, sensing of speed and current, performance parameters. Electrical machines download ebook pdf, epub, tuebl, mobi.
Electric traction has many advantages as compared to other nonelectrical systems of traction including steam traction. Loss associated large filters had to be carried on locomotives. Click download or read online button to get electrical machines book now. The presentation of the subject matter is very systematic and the language of text is lucid, direct and easy to understand. Jan 14, 2019 conventional dc and ac traction drives. Because of economic reason single phase supply is used in ac traction. Regeneration of oxaloacetate finally malate is oxidized to biochemistry 8th edition pdf download textbook of biochemistry for medical students dm vasudevan, sreekumari s. Salient pole synchronous generator analysis is made through the tworeaction theory outlined below. This site is like a library, use search box in the widget to get ebook that you want. The having, doing and being of moral personality the language of moral virtue comes easily to most of us. Review of characteristics of different types of dc and ac motors used traction and their suitability moduleiv 10 hours rating and heating of electric drives, power loss, heating and cooling of motors, classes and duty and selection of motors, drives for specific application like steel, paper, textile mills. A traction motor is an electric motor used for propulsion of a vehicle, such as locomotives, electric or hydrogen vehicles, elevators or electric multiple unit traction motors are used in electrically powered rail vehicles electric multiple units and other electric vehicles including electric milk floats, elevators, roller coasters, conveyors, and trolleybuses, as well as vehicles with. The phasor is made of a vector with magnitude proportional to the magnitude of e, rotating at a.
Choice of traction motor in hst applications is a key issue 1,2,69. In vehicle drives, induction machines properly designed for the application can have efficiencies substantially higher than those of permanent magnet machines, even if the single point efficiency of the. The important features of the electric traction drives are explained below. Electric traction 1701 however, the steam locomotive suffers from the following disadvantages. Nov, 2016 salient pole synchronous generator analysis is made through the tworeaction theory outlined below. Generating adequate normal load at the frictional contact is essential for traction drives. Electric motors and drives in torsional vibration analysis.
Chapters on electrical drives and electric traction form the significant portion of the book. It consists of nine chapters in all, covering the various topics systematically and exhaustively. Nowadays, in electric power stations generating large amounts of electric energy for agriculture, industry, domestic needs, and electrified traction facilities and in driving all kinds of working machines, electric motor is essential, which is the predominant type of drive so the. Pdf design and analysis of drive system with slip ring. Linear topologies allow the adoption of magnetic levitation framework, which reduces friction forces allowing extremely high speed to be achieved. Powersplit devices are incorporated in the powertrain. Electric traction will continue to play a dominant role in the railway since it is an environmentally clean technology compared to diesel traction and also its running cost is low. The direction of the lines of force is given by the law of the screwdriver. An electric motor stator is mounted in a concentric relationship with the rotor. Other characteristics include excellent off the line acceleration, good. Combined hybrid systems have features of both series and parallel hybrids. Rating and heating of electric drives, power loss, heating and cooling of motors, classes and duty and selection of motors, drives for specific application like steel, paper, textile mills control of electric drives microprocessor hardware and software for drive system.
An endtoend network for cosaliency detection in one single. Similarly, traction drive rollers are always in driving contact regardless of direction of tangential loading. Innovation of traction drives univerzita pardubice. Drives employing voltage source inverters, current source inverters, and induction and synchronous motors have been discussed. An endtoend network for cosaliency detection in one. The laboratory tests, present the characteristics of the drive permanent magnet synchronous motor which shows that the discussed drive is. Trv units are fitted with 2 or with 4 strong ventilators to cool the resistor elements. There are many advantages of electric traction over other forms of locomotion. Tee802dpc48331 2 tee802dpc48331 3 700 i uniform acceleration of 6 kmhs for 25 s. The ringcone mechanical variable speed drive was one of the first technologies developed during nidecshimpos storied past. The emphasis is on the performance, though the book also introduces the salient features of electrical machine design. Dc motor drives have cumbersome construction, low efficiency, low reliability and need of maintenance. Analysis of the traction drive work with permanent magnet.
Wound rotor salient pole synchronous machine drive for. Traction drives the ringcone mechanical variable speed drive was one of the first technologies developed during nidecshimpos storied past. The driving force behind powerful ideas acac traction system igbt based traction converter and locomotive computer mas 696 traction converter with 6 independent inverters electrical control cubicle with locomotive control computer tm medha servo drives pvt. Development of selfadaptive loading for planetary roller. The unit can be as a single resistor group or with multiple groups, in various. The traction circuits are conceptually solved in such a way that alternatingcurrent generators sg feed the directcurrent intermediate circuits, which is formed by capacitors and switched brake resistors bs. Those approaches detect salient objects with humanlike intuitive feelings and heuristic priors, such as color contrast5, boundary background38, 39 and center prior17.
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