Canrigs engineers set out to create a top drive with two core design criteria. Permanent magnet dc traction motor with reconfigurable winding. Toshibas innovative permanent magnet synchronous motor technology relies on reluctance torque and realizes an exceptional efficiency rate of 97%. Pdf directdrive induction motor for railway traction applications.
Users and operations manual ez floorkeeper 20 and 24 traction drive e download pdf. On one side of the traction motor housing is a traction gear case 14 which includes a drive pinion 16 secured to the armature shaft 18 of the traction motor 10. A specific embodiment of the novel ac traction motor with drive end. 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. Oct 30, 2016 now, the normal practice is to use one traction motor to drive each axle through a gear drive. There are two basic principles which governs the working of dc machine. Alternative motor technologies for traction drives of.
It is an applicationoriented book for the design and development of traction systems accompanied by a description of the core technology. The most vital factor against electric traction is the initial high cost of laying out overhead electric supply system. Nre can provide both new and rebuilt traction motors for your locomotive fleet. A traction motor is an electric motor used to drive a piece of machinery. Apr 23, 2020 a traction motor is an electric motor used to drive a piece of machinery. Traction drive system and its characteristics as power.
Motors can be mounted in a number of different configurations. It is a forced ventilated machine arranged for axle mounting on sleeve bearing. A traction motor is an electric motor the bipolar electric locomotives built by general electric for the milwaukee the railwaymans diesel manual ge 752 traction motor manual mining books. It also can be viewed as a device that transfers energy from an electrical source to a mechanical load. 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. 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. Traction motor other products toshiba international. The dc motor was the mainstay of electric traction drives on electric and dieselelectric locomotives, streetcarstrams and diesel electric. Our traction motor remanufacturing process is second to none because nre uses todays manufacturing technology to remanufacture your motor. Transverse movement is limited by the flanges of axle suspension bearing. We match our traction motors and drives perfectly to one another and to the projectspecific requirements. Referring to figure 1, a traction motor is mounted in a conventional manner on an axle 12 of a locomotive truck. A current carrying conductor placed in a magnetic field experiences a force demonstrated by lorentz law.
A single motor drives all the wheels on the truck or bogie, typically four wheels per motor. Products for railway applications schaeffler group. The existence of a potential locked axle condition is determined based on the comparing of estimated axle speed to measured vehicle. Ideal output characteristics of traction motor drive b tractive effort and power versus vehicle speed with different speed ratio. The drive which uses the electric power for moving forward, such type of drive is called an electric traction drive. Electric traction 1701 however, the steam locomotive suffers from the following disadvantages. 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. Due to its totallyenclosed design, the motor remains clean throughout extended operation.
Pinion side cylindrical roller bearing nu fan side deep groove ball bearing or cylindrical roller bearing nj with. Hitachi vector control motor drive system hivectol series 01 02 over 80 years of experience in variable speed drives hitachi, ltd. Ac induction motors known as asynchronous traction motors. Traction motor an electric motor used to drive vehicles such as electric locomotives and trains, dieselelectric locomotives and ships, and streetcars, trolleys, and other.
Power failure for few minutes can cause traffic dislocation for hours. Traction motor article about traction motor by the free. 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. Pdf the preliminary choice of electric traction motors for. 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 method includes conducting a speed test by estimating axle speed and comparing estimated axle speed to measured vehicle speed. 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. Mar 31, 2020 the ac electric traction motor segment is expected to be the largest market for electric traction motors during the forecast period.
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. Us6532405b1 method for detecting a locked axle on a. Equilibrium speed of motorload system can be obtained when motor torque equals the load torque. Zytek have developed a high power, compact, electric drive package comprising. Directdrive induction motor for railway traction applications. The model can be used to evaluate the load torque value for a particular speed of traction motor drive. A 2200v,50 hz, three phase,6 pole,yb connected squirrel cage induction motor has following parameters. Keywords filtered output of rectifier becomes the input to the inverter. In a permanent magnet motor based ev traction drive, the ripple is typically higher because the motor inductance is inherently lower.
At nre, locomotive components are repaired, upgraded or completely remanufactured to the original manufacturers specifications. Matlabsimulink based model for 25 kv ac electric traction. Now, the normal practice is to use one traction motor to drive each axle through a gear drive. 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. Field is varied by resistance insertion in parallel to field though shunting contactor in 3 to 4 steps in wag7 and wap4 locos respectively. Alternative motor technologies for traction drives of hybrid and. Nidecshimpo has a few different series of traction drive utilizing different differential design traditional conecam mechanism, planetary roller system, etc. The traction motor is a four pole dc series motor in which field winding is connected in series with armature. Pdf the preliminary choice of electric traction motors for a. Some of the technical discussion is based on work that has been reported in a conference publication1. 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. 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. Power electronics and motor drive systems sciencedirect. 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.
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. 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. Calculate ithe time taken and energy dissipated in the motor during starting. 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. Comparison of ac77 ac torque motor to d77 dc motor 62. The direct drive traction motor which eliminates gear s and hence noise and transmission losses. When called upon to brake, the frequency applied to the stator is lowered below the mechanical speed, and what happens is explained as follows. Our drives and traction motors operate all over the world. As explain by aniruddha, traction motors work like any other electric motor. Multiple drive systems per vehicle can be supported due to the safety case and levels of torque integrity employed. 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. 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. In traction motor, high performance and high efficiency are required in a wide speed range and specific tools and.
The traction drive mechanism produces smooth rotation and eliminates speed irregularity due to the high frequency vibration inherent in gear transmission. A traction motor is operated at frequency f 0,slip s 0 and delivering torque. 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. 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 determination of the asynchronous traction motor. An electric motor is a device that converts electrical energy to mechanical energy. 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. Frequency drive featuring fully controllable automatic regenerative braking and advanced wheel slipspin control. 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. Direct drive induction motor for railway traction applications.
A traction motor is an electric motor used for propulsion of a vehicle, such as locomotives. 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. How do traction motors work in electric locomotives. Matlabsimulink based model for 25 kv ac electric traction drive. Three phase induction motor as traction motor railelectrica. Author stefanos manias supplies a detailed discussion of the theory of power electronics circuits and electronic power conversion technology. Pdf the preliminary choice of electric traction motors.
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. It is an applicationoriented book for the design and development of traction systems accompanied by a description of the core. The ringcone mechanical variable speed drive was one of the first technologies developed during nidecshimpos storied past. Traction motor simple english wikipedia, the free encyclopedia. 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. One of the major application of an electric drive is to transport men and materials from one place to another. Electric motor drives play the most important role in evhevs. The system in which the motor is located and makes it spin is called the. Before the mid20th century, a single large motor was often used to drive multiple wheels through connecting rods. The electric motor applies resistance to the drivetrain causing the wheels to slow down. A lowinductance dc bus capacitor for high power traction. 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.
More than 90,000 motors are in use in a variety of rail vehicles, from trams to highspeed trains to powerful locomotives. The most popular type is the 3phase, squirrelcage ac induction motor. 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. With that in mind, toshiba developed the totallyenclosed traction motor with an efficiency rating of 94%. This was the same way that steam locomotives would turn their drive wheels. 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. Ac traction motor with drive end bearing assembly for.
Power electronics and electric drives for traction applications. A rectifier, inverter, matlab, simulink, traction, induction motor. Direction of the force is given by flemings lh rule. Best in class 1hp200 rpm brush drive motor 3 stage vacuum motor. These attributes are evident in our new one thousand ton top drive. Getting ge 752 traction motor manual is easy and simple. Expected to be the leading market for electric traction motors during the forecast period. 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. 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.
An exemplary embodiment of the invention is a method for detecting a potentially locked axle on a vehicle propelled by an ac motor. Asia pacific is expected to dominate the global electric traction motor market from 2020 to 2025. 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. Ideal torquespeed profile of traction motor drive for evhev. Traction motors in diesel locomotives ee publishers. Electric drive system will operate in steady state at this speed.
Unless the traffic to be handled is heavy, electric traction becomes uneconomical. Pdf directdrive induction motor for railway traction. The case is worse at low speeds, where the motor back emf is also low. Each traction motor is testrun before installation or shipping to insure they meet your needs. An induction motor works as a generator if mechanical speed is more than the synchronous speed. 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. 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. Adding further to your knowledge, there are two types of motor with used in electric traction in india i. 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 traction motor is suitable for a range of vehicle applications, from medium size passenger cars to light duty commercial vehicles.
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