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Encyclopedia > Traction motor

Traction motor typically refers to those motors that are used to power the driving wheels of a railroad locomotive, electrical multi-unit train (such as a subway or light rail vehicle train), or a tram. Great Western Railway No. ... This article describes subways as mass transit lines. ... This article is about light rail systems in general. ... A modern tram in the Töölö district of Helsinki, Finland a historic postcard showing electric trolley-powered streetcars in Richmond, Virginia, where Frank J. Sprague successfully demonstrated his new system on the hills in 1888 For modern innovations to make these systems higher-capacity and higher-speed, see light...


Traditionally, these are large DC series motors usually running on approximately 600 volts. Nowadays, the availability of high-powered semiconductors (such as thyristors and the IGBT transistor) has now made practical the use of much simpler, higher-reliability AC induction motors (see asynchonous traction motor). Synchronous ac motors are also occasionally used (as in the TGV). DC or dc may stand for: Dilip Chhabria, an exclusive Indian car designer Da capo, a musical term Democrazia Cristiana, a political party in Italy developed country (in the CIA World Factbook) Direct current (in electricity) Doctor of Chiropractic, a medical profession Axiom of dependent choice, in set theory (mathematics... The thyristor is a solid-state semiconductor device similar to a diode, with an extra terminal which is used to turn it on. ... The Insulated Gate Bipolar Transistor combines the simple gate drive characteristics of the MOSFET with the high current and low saturation voltage capability of bipolar transistors by combining an isolated gate FET for the control input, and a bipolar power transistor as a switch, in a single device. ... An alternating current (AC) is an electrical current, where the magnitude and direction of the current varies cyclically, as opposed to direct current, where the direction of the current stays constant. ... The TGV is Frances train à grande vitesse; literally high-speed train. Developed by Alstom and SNCF, and operated by SNCF, the French national railway company, it connects cities in France, especially Paris, and in some other neighbouring countries, such as Belgium, Germany and Switzerland. ...


Before large scale dieselization in the mid-20th century, a single large motor was often used to drive multiple driving wheels through connecting rods that were very similar to those used on steam locomotives. It is now standard practice to provide one traction motor driving each axle through a gear drive. Usually, the traction motor is simply suspended between the truck (bogie) frame and the driven axle; this is referred to as a "nose-suspended traction motor". The problem with such an arrangement is that a portion of the motor's weight is unsprung, increasing forces on the track. Occasionally, other mounting arrangements are made. In the case of the GG1, two truck-mounted motors drove each axle through a quill drive. In the case of the TGV power units, each axle is driven by a motor mounted to the power unit's frame; a "tripod" drive allows a small amount of flexibility in the drive train allowing the trucks (bogies) to pivot. By mounting the relatively-heavy traction motor directly to the power unit rather than to the truck (bogie), better dynamics are obtained allowing much-improved high-speed operation. (19th century - 20th century - 21st century - more centuries) Decades: 1900s 1910s 1920s 1930s 1940s 1950s 1960s 1970s 1980s 1990s As a means of recording the passage of time, the 20th century was that century which lasted from 1901–2000 in the sense of the Gregorian calendar (1900–1999 in the... On a steam locomotive, a driving wheel is a powered wheel which is driven by the locomotives pistons (or turbine, in the case of a steam turbine locomotive). ... piston + connecting rod In a reciprocal piston engine, the connecting rod connects the piston to the crankshaft. ... Great Western Railway No. ... US_style railroad truck. ... PRR GG1 number 4890 on display at the National Railroad Museum in Green Bay, WI. The Pennsylvania Railroads GG1 class of electric locomotives were built between 1934 to 1943, with a total of 139 units constructed. ... A quill drive is a mechanism that allows a driven shaft to shift its position (either axially, radially, or both) relative to its driving shaft. ... The TGV is Frances train à grande vitesse; literally high-speed train. Developed by Alstom and SNCF, and operated by SNCF, the French national railway company, it connects cities in France, especially Paris, and in some other neighbouring countries, such as Belgium, Germany and Switzerland. ... Bogies This game was started by BBCs Dick and Dom as part of their hit childrens TV show, Dick and Dom in da Bungalow. ... US_style railroad truck. ...


Because of the high power levels involved, traction motors are almost always cooled using forced air.


  Results from FactBites:
 
Traction motor - Wikipedia, the free encyclopedia (331 words)
Traction motor typically refers to those motors that are used to power the driving wheels of a railroad locomotive, electrical multi-unit train (such as a subway or light rail vehicle train), or a tram.
Usually, the traction motor is simply suspended between the truck (bogie) frame and the driven axle; this is referred to as a "nose-suspended traction motor".
By mounting the relatively-heavy traction motor directly to the power unit rather than to the truck (bogie), better dynamics are obtained allowing much-improved high-speed operation.
Electric motor - Wikipedia, the free encyclopedia (3896 words)
The modern DC motor was invented by accident in 1873, when ZĂ©nobe Gramme connected a spinning dynamo to a second similar unit, driving it as a motor.
The speed of the motor is proportional to the voltage, and the torque is proportional to the current.
Synchronous motors are occasionally used as traction motors; the TGV may be the best-known example of such use.
  More results at FactBites »

 
 

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