A lowinductance dc bus capacitor for high power traction. Jul 17, 2017 set the dc motor on an insulated pad or piece of wood so the frame is not in contact with any metal surface. May 12, 20 speed torque equation of dc series motorlimits are set on the torque speed characteristics of series motor as t max and s max as per the design parameter. T max is fixed on the basis of short term thermal rating of the motor and adhesion available where s max depends on the mechanical design and the services the locomotive has to perform. Conventional designs have been using a set of electrolytic bulk capacitors to. The traction motor is suitable for a range of vehicle applications, from medium size passenger cars to light duty commercial vehicles.
Dec 20, 2016 now if we talk about a dc motor which also works on the same principle since it is also a rotational machine. With a dc series motor, the current and torque produced at standstill may be reduced by strengthening the. Two motor, twoaxle traction system for full electric. This section also presents an analytical method for defining the vehicle performance. The track electrification refers to the type of source supply system that is used while powering the electric locomotive systems.
Other members of the family are the directcurrent dc motor or generator, the induction motor or generator, and a number of derivatives of all these three. Maintenance and troubleshooting of electric motors reliance electric posted 11005 motor maintenance scheduled routine care introduction the key to minimizing motor problems is scheduled routine inspection and service. Frames d188 and d223 utilize strap wound field coils, providing high current carrying capability to insure longer field coil insulation life. The overhaul and maintenance of directcurrent traction motors. Traction motor is one of the most important equipment of ac emumemu which provides driving power to the wheel. If the motor is operated with the thermal protective devices tripped indicating an over temperature condition, the motor insulation could be damaged and complete failure of the motor insulation is possible.
Pdf operation analysis of ac traction motors in terms of. Then the operation of the principal types of traction machine. Massachusetts institute of technology 1 introduction this is a concept paper in response to the foa entitled rare earth alternatives in critical technologies. Reconditioned dc hitorque drilling motor continuous rating for mud pump and. Efficiency is as important in drive systems for hybrid electric vehicle drive motors as it is for industrial motors in manufacturing facilities and commercial buildings.
Weve seen the pitfalls and the hurdles, and know the strategies to keep an electrified rail system moving even while the power system is under replacement. Brushless dc motor design for electric traction system. Its operation is based on the principle that when a current carrying conductor is placed in a. Traction motors in diesel locomotives ee publishers. A traction motor is an electric motor used for propulsion of a vehicle, such as locomotives or electric roadway vehicle 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 electrical transmission systems diesel. Serieswound dc motors have the disadvantage that, if wheelslip occurs in a standard dc drive, there is the tendency for the traction motor to speed up and run away, even to the point of mechanical failure if the power is not reduced quickly. Nov 30, 2015 the dc supply is then applied to the dc motor via suitable contact system and additional circuitry. Bidirectional dc dc converter, traction motor, nine switch inverter, fuel cell. Understanding of the torque of dc motor is a very important in order to understand its operational parameters and its speed control etc. Traction drive battery charger necessary for plugin hybrids and electric vehicles bi directional boost converter steps up the battery voltage when the traction system requires a higher operating voltage than the battery can supply inverter converts direct current dc to alternating current ac for the electric motor. The dc bus capacitor is the most important passive component in a traction motor drive. Electric propulsion controls and accessories a 77 a torque. The dc motors are offered to perform traction, lifting and steering operations for any type of batterypowered vehicle with a voltage range from 24 up to 96v thanks to our expertise we can design and create windings of any type permanent magnets, series excitation, compounds, sepex etc and we can also offer a wide and varied range of mechanical configurations more than thousand of. Pdf on may 3, 2019, ahmed m t ibraheem alnaib and others published dc motors find, read and cite all the research you need on researchgate.
The locomotives had an hourly rating of 780 kw and 1,200 kw respectively and a top speed of 75 kmh. Basics of dc motors for electrical engineers beginners. In deep and trustful partnerships with vehicle builders, refurbishers, and rail operators, we supply stateoftheart traction. The electric motor applies resistance to the drivetrain causing the wheels to slow down. The traction motor tao659 has the following main parts. Dc motor principle a machine that converts dc power into mechanical energy is known as dc motor.
Ac77 ac torque motor features mechanically compatible with the d77 motor, the a77 fits in same pedestal position in the locomotive truck bogie. The motor now works as a generator, producing the braking torque. How to start and control the speed of traction motors. These range in output from 150 hp to the industrys only 5 horsepower. The advantages of this system include in case of heavy trains that require frequent and rapid accelerations, dc traction motors are better choice as compared ac motors. Brushless dc motor design for electric traction system md. Ac dc traction motor remanufacturing to oem specifications. Motor and generator capabilites new ac dc motor and generator manufacturing ac dc traction motor remanufacturing onsite vpi capabilities onsite testing equipment over 30 years experience any quantity 1 to 1,000s worldwide customer base references available. In return, the energy from the wheels turns the motor, which functions as a generator, converting energy normally wasted during coasting and braking into electricity, which is stored in a battery until needed by the electric motor.
For the braking operation in dynamic braking, the motor is connected in two ways. Introduction this project is mainly concentrates on a simulation of locomotive control of traction motor using a new bidirectional dc dc ac converter. Swiger coil systems ac dc traction motor remanufacturing to oem specifications. It is a forced ventilated machine arranged for axle mounting on sleeve bearing. In case of ac traction the communication lines running along the track experience considerable interference from the power lines. The frequency of routine service varies widely between applications. Basics of dc motors for electrical engineers beginners on photo. New ac dc motor and generator manufacturing ac dc traction motor remanufacturing onsite vpi capabilities onsite testing equipment over 30 years experience any quantity 1 to 1,000s worldwide customer base references available swiger coil systems, llc is americas leading supplier of traction. Traction motor selection this section reports the procedure adopted for front and rear motor selection. What is common to all the members of this family is that the basic. Pdf theoretical and practical perspectives of diesel.
Hp duty cycle shunt wound volts dc 750 750 arm amps 1185 1435. In case of dc series motor regeneration is not simple process. Brushcommutated dc motors, direct current motors, with a power up to 400w. If there is a short in the motor wiring and the frame of the motor is in contact with a conductive surface, the escaping voltage can travel to the nearest ground path. Ruggedness, dependability and ease of use are the reasons that baldor pmdc motors are specified by more customers than any other. With 30 years of dc traction power substation rehabilitation, replacement, and new installation, theres no design challenge we havent faced. Dc motors although ac motors are used in most of the cases, dc motors have many applications and used for multipurpose applications. Gw dc traction motor is high efficient and energy saving the dc traction motor is low noise and little vibration the protective class. Dc motors, installation, operation and maintenance manual. Massachusetts institute of technology 1 introduction this is a concept paper in response to the foa.
Traction motor is the most important part of a locomotive. Baldor permanent magnet dc motor at the heart of our dc motor lineup are the many sizes of our versatile permanent magnet dc motors. Examine product characteristics and technical specifications for major brands view pdf. Dynamic braking or rheostatic braking of dc motor in dynamic braking, a braking resistor rb is connected across the armature as soon as the dc motor is disconnected from the supply mains. Abb is the expert for traction converters, motors, transformers, and complete traction chain solutions. An electric locomotive is a locomotive powered by electricity from overhead lines, a third rail or onboard energy storage such as a battery or a supercapacitor electric locomotives with onboard fueled prime movers, such as diesel engines or gas turbines, are classed as dieselelectric or gas turbineelectric and not as electric locomotives, because the electric generator motor combination. It aims to find the frontrear motor combination yielding to the best vehicle performance in the whole operating speed range of the vehicle. The use of low voltage level yields to reduced the insulation level for active components and to lower the electromagnetic emissions than higher voltage systems. The rotor and stator are each connected from a different power supply, this gives another degree of freedom for controlling the motor over the shunt. Series commutator motor, therefore it requires regular maintenance. This is the case with the vast majority of dc traction motors operating on railways in southern africa. Its proper upkeep and maintenance is necessary to ensure good reliability and availability of ac emumemu. Permanent magnet dc traction motor with reconfigurable winding. Dc, synchronous and induction asynchronous motors is described, and their steadystate torque.
Typical dc motor drawbacks such as armature commutator damage, carbon tracking, frequent brush replacement and commutator repair, are nonexistent with the ac induc on motor. The contractor shall provide serviceproven overhauled direct current traction motors by using components that have functioned successful in revenue service since delivery. Transverse movement is limited by the flanges of axle suspension bearing. Theoretical and practical perspectives of diesel locomotive with dc traction motors wheelsets slipping and sliding control article pdf available in transport 264. A ge dc motor with a model number which has the format, 5cdnnnllnnnlnnn, 5cdnnnlllnnlnnn or 5bynnnllnnnlnnn where nnumber and lletter will be replaced with an exact electricalmechanical replacement of the original motor. In this article we will discuss about how to start and control the speed of traction motors. This interactive publication is created with flippingbook, a service for streaming pdfs online. Only series and compound dc motors are suitable for traction work. Brushless motors, bldc motor, sensorless motor, motor. Traction motors used to drive trains are series motors that provide the required torque and horsepower to get massive amounts of weight moving. Permanent magnet dc traction motor with reconfigurable winding control idea program final report for the period june, 2003 through september, 2006 contract number hsr44 prepared for the idea program transportation research board national research council nicholas n. A traction motor is an electric motor used for propulsion of a vehicle, such as locomotives or.
On the commutator side, opening has been provided for upper air inlets from mvmt and lower inspection cover. On the coldest days of winter the series motor that starts your car overcomes the extreme cold temperatures and thick lubricant to get your car going. Dc motors enable accurate torque regulation, when operating as a motor or as a generator, and rotation speed, independent of the line supply frequency. The traction motor is a four pole dc series motor in which field winding is connected in series with armature. Permanent magnet dc traction motor with reconfigurable. Twomotor, twoaxle traction system for full electric vehicle. Multiple drive systems per vehicle can be supported due to the safety case and levels of torque integrity employed. We are leading manufacturer of generalpurpose brushless dc bldc motors with power range from 200w to 20kw, and the voltage range from 24v to 120v dc.
Ac traction motors, electrification systems, and railway signalling and control. For these adhesion forces to appear, tractive or braking effort needs to be applied to the wheels. Installation dc motors have characteristics which can cause serious or fatal injury unless they are selected, installed, maintained and operated by quali. 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. In deep and trustful partnerships with vehicle builders, refurbishers, and rail operators, we supply stateoftheart traction systems. A wide variety of dc traction motor options are available to you, such as ccc, ce, and rohs. This torque must be generated in a motor or braking system that. The dc traction motor in particular is invariably a tight design in order to achieve maximum output within the space limitations between the rails and both mechanical and electrical clearances tend to be at a premium. Directcurrent motors with series field windings are the oldest type of traction motors. The rotor and stator windings are connected in parallel. Gw dc traction motor is high efficient and energy saving the dc traction motor is low noise and little vibration the. Simulation of locomotive of traction motor using a new. General aspects of railway traction what really causes the train to accelerate or br ake are the adhesion forces that appear in the wheelrail contact. Peerless electric traction motors are low voltage series wound dc motors of multipolar design and normally rated for one hour varying duty to provide maximum efficiency for maximum battery life.
Hightorque dc drilling motor performance ratings the 752 hightorque dc drilling motor with 2800 scfm airflow and temperature rise of 155 oc at 40c ambient. 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. What is dynamic braking or rheostatic braking of dc motor. The motors include a range with supply voltages between 236v and can, depending on the type, be supplied with or without gear, encoder and brake. Houghton internationals, risasapproved, rail division specialises in the repair, maintenance and life extension of electro mechanical assets into the uk and global markets, including ac and dc traction motors, alternators, generators and motor alternator sets. For the fuel cell based traction motor both bidirectional dc dc converter and inverter are. These provide a speedtorque characteristic useful for propulsion, providing high torque at lower speeds for acceleration of the vehicle, and declining torque as speed increases. Electric traction system is tied up to only electrified routes. Traction systems for locomotives and high speed applications. Dc traction motors amre design and production since 1954. Speed torque equation of dc series motorlimits are set on the torque speed characteristics of series motor as t max and s max as per the design parameter.
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