A77 a torque motor for locomotives ac77 ac torque motor terminal box cover removed weight. This paper provides an overview of the hybrid system, discusses the characteristics required of a traction drive motor, and. The motor torquespeed characteristics are usually provided by the supplier. The rotor will rotate via the magnetic field and create torque on the drive shaft of the motor. This system included the new development of a highspeed traction drive motor achieving a significant increase in power weight ratio. Study of excitation characteristics of traction machinedrive. Electric propulsion controls and accessories a 77 a torque. The no load speed, is the maximum output speed of the motor when no torque is applied to the output shaft.
Interaction between the magnetic field of these electromagnets generates twisting force, or torque. Traction motors in diesel locomotives ee publishers. The motor can be clearly seen behind the axle with the gear box with the writing on it in the center. A traction motor is operated at frequency f 0,slip s 0 and delivering torque. Motor control 117 introduction motor control design for industrial applications requires attention to both superior performance and ruggedness. The actual fullload motor slip as a percent of the motor synchronous speed varies in inverse proportion to the frequency, where a 3% slip motor 60 hz. Ranvar resins provide outstanding moisture and chemical resistance in small and large motor applications. Classification of electric motors electrical knowhow. The characteristics of the induction motors used for tabriz urban railway are.
Ideal output characteristics of traction motor drive b tractive effort and power. Characterization of electric motor drives for traction applications. Improved ac motor technology requires less maintenance and repair down me than dc motor. Pdf dynamic characteristics of motorgear system under. The nonlinear characteristics of a dc motor such as saturation and friction could degrade the performance of conventional controllers. In the design of the induction motor, operational characteristics can be determined through a series of calculations. Effects of motor skill intervention on developmental coordination disorder. Three phase induction motor as traction motor railelectrica. All rights, including rights created by patent grant or registration of a utility model or design, are reserved.
As a result, the motor rotates in the direction of the resultant. Alternative motor technologies for traction drives of hybrid and. Transverse movement is limited by the flanges of axle suspension bearing. Pdf morphological and motor characteristics of croatian. Speed torque characteristics of brushless dc motor in. Limits are set on the torque speed characteristics of series motor as t max and s max as per the design parameter. Traditionally each traction motor was custom made to fit a specific vehicle.
This application note discusses the basics of an ac induction motor. The rotor has salient poles and a cage so that it starts like an induction motor, and runs like a synchronous motor. 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. This is one of the most required characteristics of dc series motor. A metaanalysis mia pless and marianne carlsson uppsala university, sweden the purpose was to determine whether evidence exists in published research from 1970 to 1996 to support motor skill intervention for children with devel. Its one designed for moving things under their own propulsion. Dielectric characteristics of electric vehicle traction. The motors used are induction or asynchronous motors designed to have characteristics suitable for traction. This characteristic is represented as the ratio of its maximum speed to its base speed, that is the speed ratio x.
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 series motor is designed to move large loads with high torque in applications such as crane motor or lift hoist. The new motor cores, including the integrated controller, will fit in the existing housing with space to spare. You find them on land vehicles, could be an electric locomotive or a milk float though you dont see many of those any more. Traction motor should handle small disturbance in supply. Motor characteristics are frequently given as two points on this graph. Uses soft magnet rotor that is magnetized by the application of current in the stator coils 3.
The stall torque, represents the point on the graph at which the torque is a maximum, but the shaft is not rotating. At any other condition, the motor and load will be either accelerating or decelerating. Speedtorque characteristics of induction motor derives the tractive effort vs speed characteristics of three phase induction motor. The dieselgenerator and induction motor simulations have shown good results, and can adequately demonstrate the dynamics for testing and comparing the starting methods. A comparison of induction motor starting methods being. Mathematic model of threephase induction machine connected to advanced inverter for traction system for electric trolley liviu s. A traction motor is an electric motor used to drive a piece of machinery. Correct matching of a motor to a driven machine can only be confidently accomplished if both the motor and the load torquespeed characteristics are known. This paper presents the speed torque characteristics of bldc motor on load in forward and reverse direction. What is common to all the members of this family is that the basic physical process involved in their operation is the conversion of electromagnetic energy to mechanical energy, and vice versa. The magnet is spun by a 3 phase ac motor with no rotor voltage 4.
Induction motor structures in dc electrified railways with their dynamic performance are studied. Its advantage to the industrial user is its higher efficiency and low cost in large sizes. Other websites deconstructing a traction motor associated rewinds ireland limited image of a nose mounted traction motor on an r46 new york city subway car. Synchronous motors the most obvious characteristic of a synchronous motor is its strict synchronism with the power line frequency. 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. The speed torque characteristics of a motor is given by the relation. Motor selection criteria rev ii philadelphia university. Dynamic characteristics of motorgear system under load saltations and voltage transients article pdf available in mechanical systems and signal processing 100. Pdf operation analysis of ac traction motors in terms of. Home technical articles 4 types of dc motors and their characteristics dc motor characteristics as you already know, there are two electrical elements of a dc motor, the field windings and the armature.
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. Characteristics of the current, voltage, electrical and mechanical torque and active and reactive power in accelerating, normal and regenerative braking are investigated. The universal motor is a rotating electrical machine similar to dc series motor, designed to operate either from ad or dc source. The torquespeed characteristic of a repulsion motor. Speed torque characteristics of different kinds of load are divided into the following.
Traction motors components for traction applications siemens. An ac motor works by applying alternating current to stator windings, which produce a rotating magnetic field. Dielectric characteristics of electric vehicle traction motor winding insulation under thermal ageing in 2015 ieee 15th international conference on environment and electrical engineering, eeeic 2015 conference proceedings pp. The characteristics of variable speed electric motors are shown in the figure 3. Motors for a typical locomotive would be in the range 400 to 600 kw. In 15, the ev motor driven by an inverter has a large pwm carrier harmonic iron loss in the lowtorque region. Appliances, hvac industry, medical, electric traction, automotive, aircrafts, military equipment, hard disk. The characteristics of the induction motor are illustrated below.
Traction motor article about traction motor by the free. Public transportation, whether it be trains, trolleys, mass transit or high speed rail. 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. Permanent magnet dc traction motor with reconfigurable.
The reproduction, transmission or use of this document or its contents is not permitted without express written authority. An important issue that correlates these aspects is the electromagnetic torque developed by an electric traction motor. Abstractthis paper presents the characteristic of newly developed electrical steel and motor performance analysis for electric vehiclesev. In a split phase motor, the ratio of number of turns for starting winding to that for running winding is the efficiency of shaded pole motor is in the range the capacitance of a small single phase motor will be of the order of. My original aim was to bridge the gap between specialist textbooks which are pitched at a level too academic for the average user and the more prosaic handbooks, which are full of useful detail but provide. The traction motor is a four pole dc series motor in which field winding is connected in series with armature. Massachusetts institute of technology 1 introduction this is a concept paper in response to the foa entitled rare earth alternatives in critical technologies. Effects of motor skill intervention on developmental. And international journal of mechanical and production engineering, issn. It is a forced ventilated machine arranged for axle mounting on sleeve bearing. Toyota motor corporation developed in 2005 a new hybrid system for a large suv. Because the magnetic field rotates in this way, an ac motor does not need power or mechanical aid to be applied to the rotor. 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. The aim of this study was to determine the structure of morphological and motor characteristics of croatian first league female football players and their impact on the estimated quality of the.
Ideal torquespeed profile of traction motor drive for evhev. An887, ac induction motor fundamentals microchip technology. The armature windings are made up of current carrying conductors that terminate at a commutator. The speed and torque of the motor are controlled by varying the frequency, voltage and current applied to the stator coils. Page 2 of provide a motor that is best suited to a particular application. Small disturbances occur when train crosses the section insulators and cross over. Brushless dc motor design for electric traction system.
They arent any different in principle from other electr. It is defined as relationship between the speed at which it is operated and the load torque. More than 90,000 motors are in use in a variety of rail vehicles, from trams to highspeed trains to. 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.
Brushless dc motor design for electric traction system i. An induction motor can be treated as a rotating transformer i. Some of the technical discussion is based on work that has been reported in a conference publication1. Basic construction and operating principle like most motors, an ac induction motor has a fixed. Motor speed relationship the synchronous speed of an ac motor is the speed of the rotating magnetic field set up by the stator winding synchronous speed rpm 120 x frequency divided by the number of poles. This inevitably resulted in long lead times to accommodate the design, engineering, productspecific supply chain logistics, quality assurance and the cre. When called upon to brake, the frequency applied to the stator is lowered below the mechanical speed, and what happens is explained as follows. Maxims feature integration and superior specifications enhance motor controller equipment precision while improving robustness in harsh industrial environments. Performing these calculations can help the engineer.
The move to electric cars and public transportation has been a key aspect of the green initiative in many. Development of traction drive motors for the toyota hybrid. In lowspeed region, motor will operate at constant torque, whereas in highspeed region, motor will operate at constant power. 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. That is, the integrated controller also precludes the need for an external power. Motor torque and power university of california, irvine. Vehicle manufacturers and users are continuing to expect more value and flexibility in electric vehicle motor and control systems as they are applied today.