As explain by aniruddha, traction motors work like any other electric motor. The traction drive mechanism produces smooth rotation and eliminates speed irregularity due to the high frequency vibration inherent in gear transmission. 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. May 12, 20 this achieved by varying the single phase 25kv ac voltage through on load tap changer, rectification, smoothing and applied to traction motor. Comparison of ac77 ac torque motor to d77 dc motor 62. The determination of the asynchronous traction motor. Rising investments in electric vehicles and the growing metro rail network in the region are likely to drive the demand for electric traction motors in asia pacific. The model can be used to evaluate the load torque value for a particular speed of traction motor drive. Power electronics and electric drives for traction. Traction drive vs gearbox technology low rolling friction, minimal moving parts allows for maximum energy transfer efficiency optional overrunning clutch available prevents regeneration of power in certain applications not torque loss between 10 and 3,000 rpm traditional gearboxes lose over 50% of their torque at the same speed ranges.
Pdf the preliminary choice of electric traction motors for a. Traction motor currentinsulated bearings 6 bearing arrangements for drive units traction motor bearing arrangements traction motor bearing arrangements in most cases, traction motors have the following bearing arrangement. Adding further to your knowledge, there are two types of motor with used in electric traction in india i. A source of pressurized air is connected to the entrance aperture in the drive end of the motor for providing a flow of air into the drive end of the motor frame, the air flowing within the frame and exiting the frame through the exit aperture.
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. Best in class 1hp200 rpm brush drive motor 3 stage vacuum motor. Pdf the preliminary choice of electric traction motors. Some of the technical discussion is based on work that has been reported in a conference publication1. Zytek have developed a high power, compact, electric drive package comprising. Electric motors and drives fundamentals, types and applications third edition austin hughes senior fellow, school of electronic and electrical engineering, university of leeds amsterdam boston heidelberg london new york oxford paris san diego san francisco singapore sydney tokyo newnes is an imprint of.
Before the mid20th century, a single large motor was often used to drive multiple wheels through connecting rods. How do traction motors work in electric locomotives. These attributes are evident in our new one thousand ton top drive. Multiple drive systems per vehicle can be supported due to the safety case and levels of torque integrity employed. An induction motor works as a generator if mechanical speed is more than the synchronous speed.
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. A traction motor is an electric motor used for propulsion of a vehicle, such as locomotives. The system in which the motor is located and makes it spin is called the. Simulation of the traction induction drive the considered traction ac drive consists of the traction induction motor with squirrelcage rotor, threephase power inverter and control system. Expected to be the leading market for electric traction motors during the forecast period. Ideal output characteristics of traction motor drive b tractive effort and power versus vehicle speed with different speed ratio.
Getting ge 752 traction motor manual is easy and simple. The ringcone mechanical variable speed drive was one of the first technologies developed during nidecshimpos storied past. Our drives and traction motors operate all over the world. The most popular type is the 3phase, squirrelcage ac induction motor. Power electronics and electric drives for traction applications offers a practical approach to understanding power electronics applications in transportation systems ranging from railways to electric vehicles and ships. Traction motors may use alternating or direct current, and they may have individual or group electric drive to transmit the torque from the engine shaft to the. Traction drive ac servomotor for traction frame capacity w type wheel diameter mm drive outer dia mm reduction ratio rated output torque nm peak output torque nm a200 200 output from gear holder 100 117 9. The preliminary choice of electric traction motors for a helicopter traction drive technical report pdf available march 2015 with 1,537 reads how we measure reads. The traction motor is suitable for a range of vehicle applications, from medium size passenger cars to light duty commercial vehicles. Pdf directdrive induction motor for railway traction applications.
A traction motor is operated at frequency f 0,slip s 0 and delivering torque. Matlabsimulink based model for 25 kv ac electric traction. Three phase induction motor as traction motor railelectrica. Now, the normal practice is to use one traction motor to drive each axle through a gear drive. Ac traction motor with drive end bearing assembly for. A traction motor is an electric motor used to drive a piece of machinery. Consisting of heavy wire wound inside of the motor s case known as the field windings and wire wound around the motor s inner shaft called the armature, the electric power is transported between the two elements through brushes. Top drive systems as one of the worlds leading suppliers of top drive systems in the oil and gas industry, canrig strives to set the standard for safety, reliability and efficiency. Unless the traffic to be handled is heavy, electric traction becomes uneconomical. Traction motor an electric motor used to drive vehicles such as electric locomotives and trains, dieselelectric locomotives and ships, and streetcars, trolleys, and other.
Alternative motor technologies for traction drives of hybrid and. Traction motor article about traction motor by the free. The traction motor is a four pole dc series motor in which field winding is connected in series with armature. In a permanent magnet motor based ev traction drive, the ripple is typically higher because the motor inductance is inherently lower. 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. Equilibrium speed of motorload system can be obtained when motor torque equals the load torque.
Direct drive induction motor for railway traction applications. In traction motor, high performance and high efficiency are required in a wide speed range and specific tools and. Mar 31, 2020 the ac electric traction motor segment is expected to be the largest market for electric traction motors during the forecast period. A rectifier, inverter, matlab, simulink, traction, induction motor. Apr 23, 2020 a traction motor is an electric motor used to drive a piece of machinery. Traction motors in diesel locomotives ee publishers. A current carrying conductor placed in a magnetic field experiences a force demonstrated by lorentz law. Traction motor other products toshiba international. The case is worse at low speeds, where the motor back emf is also low. The market is witnessing the replacement of dc electric traction motors with ac electric traction motors as a result of advantages such as higher reliability and efficiency and are expected to drive the ac. Directdrive induction motor for railway traction applications. Download fulltext pdf the preliminary choice of electric traction motors for a helicopter traction drive technical report pdf available march 2015 with 1,537 reads. A specific embodiment of the novel ac traction motor with drive end.
Keywords filtered output of rectifier becomes the input to the inverter. Products for railway applications schaeffler group. A 2200v,50 hz, three phase,6 pole,yb connected squirrel cage induction motor has following parameters. Calculate ithe time taken and energy dissipated in the motor during starting. Power electronics and motor drive systems is designed to aid electrical engineers, researchers, and students to analyze and address common problems in stateoftheart power electronics technologies. One of the major application of an electric drive is to transport men and materials from one place to another.
Electric drive system will operate in steady state at this speed. Hitachi vector control motor drive system hivectol series 01 02 over 80 years of experience in variable speed drives hitachi, ltd. Frequency drive featuring fully controllable automatic regenerative braking and advanced wheel slipspin control. Pdf directdrive induction motor for railway traction. Oct 30, 2016 now, the normal practice is to use one traction motor to drive each axle through a gear drive. Author stefanos manias supplies a detailed discussion of the theory of power electronics circuits and electronic power conversion technology. Work under this section shall include all materials and installation for traction elevators including gearless pedestrian elevators, gearless patient elevators, and geared service elevators, as shown and detailed on the drawings and specified herein, including. When called upon to brake, the frequency applied to the stator is lowered below the mechanical speed, and what happens is explained as follows. An exemplary embodiment of the invention is a method for detecting a potentially locked axle on a vehicle propelled by an ac motor.
In an induction motor based ev traction drive, this ripple is around 25 to 65% of the rated load current. Usually, the traction motor is mounted between the wheel frame and the driven axle. The dc motor was the mainstay of electric traction drives on electric and dieselelectric locomotives, streetcarstrams and diesel electric. The electric motor applies resistance to the drivetrain causing the wheels to slow down. Electric motor drives play the most important role in evhevs. Developed computer simulation of the traction ac drive is based on the module principle and represents the set of individual caspoc models, which interact with. Traction motors components for traction applications. Alternative motor technologies for traction drives of. Direction of the force is given by flemings lh rule. An electric motor is a device that converts electrical energy to mechanical energy.
At nre, locomotive components are repaired, upgraded or completely remanufactured to the original manufacturers specifications. It is a forced ventilated machine arranged for axle mounting on sleeve bearing. Alternative traction motor technology for the past several years, the interior permanent magnet ipm motor has been considered the popalur choice for electric traction drive systems. Sep 17, 2016 power electronics and electric drives for traction applications offers a practical approach to understanding power electronics applications in transportation systems ranging from railways to electric vehicles and ships. The drive which uses the electric power for moving forward, such type of drive is called an electric traction drive. The main traction inverter, a critical component in the electrified drivetrain, has a direct influence on the driving experience, the battery range and the overall safety of the vehicle. Each traction motor is testrun before installation or shipping to insure they meet your needs. The design of these new traction motors requires accurate sizing procedures 8,9 that differ from the process of a traditional industrial machine, where it is designed to mostly operate at a nominal speed and torque. Power electronics and electric drives for traction applications. The direct drive traction motor which eliminates gear s and hence noise and transmission losses. Power failure for few minutes can cause traffic dislocation for hours. The purpose of the traction inverter is to convert the dc current from the electric vehicles battery to ac current to be used in the electric motor to. Nre can provide both new and rebuilt traction motors for your locomotive fleet. Electric traction 1701 however, the steam locomotive suffers from the following disadvantages.
Consisting of heavy wire wound inside of the motors case known as the field windings and wire wound around the motors inner shaft called the armature, the electric power is transported between the two elements through brushes. The most vital factor against electric traction is the initial high cost of laying out overhead electric supply system. Due to its totallyenclosed design, the motor remains clean throughout extended operation. We match our traction motors and drives perfectly to one another and to the projectspecific requirements. Field is varied by resistance insertion in parallel to field though shunting contactor in 3 to 4 steps in wag7 and wap4 locos respectively. The method includes conducting a speed test by estimating axle speed and comparing estimated axle speed to measured vehicle speed. Asia pacific is expected to dominate the global electric traction motor market from 2020 to 2025. Nidecshimpo has a few different series of traction drive utilizing different differential design traditional conecam mechanism, planetary roller system, etc. More than 90,000 motors are in use in a variety of rail vehicles, from trams to highspeed trains to powerful locomotives. A lowinductance dc bus capacitor for high power traction. Our traction motor remanufacturing process is second to none because nre uses todays manufacturing technology to remanufacture your motor. Feb 07, 1995 a drive end bearing assembly for a traction motor, the motor having a pinion end plate and a pinion end chamber forward of the pinion end plate to receive pressurized cooling air for the motor, the motor also including a rotatable shaft which extends rearward through an aperture formed in the end plate, the assembly comprising. Toshibas innovative permanent magnet synchronous motor technology relies on reluctance torque and realizes an exceptional efficiency rate of 97%. Traction drive system and its characteristics as power.
Pinion side cylindrical roller bearing nu fan side deep groove ball bearing or cylindrical roller bearing nj with. Permanent magnet dc traction motor with reconfigurable winding. Chicago, march 31, 2020 prnewswire according to the new market research report electric traction motor market by type ac and dc, power rating below 200 kw, 200400 kw, and above 400 kw. Ac induction motors known as asynchronous traction motors. 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. A single motor drives all the wheels on the truck or bogie, typically four wheels per motor. Referring to figure 1, a traction motor is mounted in a conventional manner on an axle 12 of a locomotive truck. Traction motor an electric motor used to drive vehicles such as electric locomotives and trains, dieselelectric locomotives and ships, and streetcars, trolleys, and other electric vehicles.
Motors can be mounted in a number of different configurations. Power electronics and motor drive systems sciencedirect. It also can be viewed as a device that transfers energy from an electrical source to a mechanical load. Transverse movement is limited by the flanges of axle suspension bearing. Pdf the preliminary choice of electric traction motors for. 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. Matlabsimulink based model for 25 kv ac electric traction drive. Ideal torquespeed profile of traction motor drive for evhev. With that in mind, toshiba developed the totallyenclosed traction motor with an efficiency rating of 94%. Users and operations manual ez floorkeeper 20 and 24 traction drive e download pdf. It is an applicationoriented book for the design and development of traction systems accompanied by a description of the core technology. Traction motor simple english wikipedia, the free encyclopedia.
410 1490 1108 893 779 1016 1374 787 1258 1083 656 117 933 204 840 322 581 880 1449 245 1402 1258 1313 650 249 614 889 107 32 473 1147 245 184 1010 1168 1499 999 267 32 281 1101 1424 70