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Topic: Traction motor

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	Traction motor - Wikipedia, the free encyclopedia
		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.
	en.wikipedia.org /wiki/Traction_motor (331 words)

	Electric motor - Wikipedia, the free encyclopedia
		The modern DC motor was invented by accident in 1873, when Zénobe 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.
	en.wikipedia.org /wiki/Induction_motor (3896 words)

	[No title]
		The traction motor is the sturdy insulated metal frame along with the armature and the commutator which turns in reaction to the electrical field supplied by the armature.
		As stated previously a traction motor with wheels weighs in at 10,400 lbs which is why 25 ton and 50 ton heavy duty suspended electrical cranes are a necessity for the tear down operation.
		Once the wheel set and traction motor become a single unit grease is applied to the gears in the form of 14 1lb bags of "Texaco TM Gear Lube- Heavy" which are dropped onto the gear as the traction motor is hooked up to cables and turned.
	www.trainnet.org /Libraries/Lib002/TRACTI.TXT (3360 words)

	Adaptive demagnetization compensation for a motor in an electric or partially electric motor vehicle - US Patent 6591925 (Site not responding. Last check: 2007-10-22)
		In particular, a voltage sensor incorporated in generator motor 30 and a voltage sensor in traction motor 38 determine a voltage that is proportional to the magnetization of permanent magnets in generator motor 30 and traction motor 38, as described below.
		The permanent magnet induced voltages from traction motor 38 and generator motor 30 are used by controller 100 to determine a state of the permanent magnets contained within traction motor 38 and generator motor 30.
		Based on the state of the permanent magnets in traction motor 38 and generator motor 30, controller 100 determines a current provided by inverters 106, 108; determines whether the traction motor 38 or generator motor 30 are operable; and initiates warnings to a user.
	www.patentstorm.us /patents/6591925.html (4646 words)

	Metal and Nonmetal Mine Safety and Health Fatal Accident Report, Machinery, July 24, 1997
		Each traction motor had a axle with wheels that were identified as L (left) and R (right) and whose position under the locomotive was identified by numbering from the front (1) to the rear (4) of the locomotive.
		A flat bed truck carrying the new traction motor was placed by the truck assembly and the replacement motor with axle and wheels was moved from the truck to the rail tracks.
		The frame was lowered onto the traction motor and the crane was connected to the traction motor lifting eyes to lift the motor and rear of the frame as a unit.
	www.msha.gov /FATALS/1997/FTL97M40.HTM (2823 words)

	Traction Motors (Site not responding. Last check: 2007-10-22)
		Motors are driven by a DC power provided by a generator output power (DC) or other suitable supply.
		By replacing the old motor with the Hi-Torque motor, confirming that the power source has adequate current capacity and resetting the current limits to the higher values, more power is available for drilling, circulating and hoisting.
		Motor is provided with a alternating current space heater as protection against condensation during shutdown.
	www.joliet-equipment.com /traction_motors.htm (753 words)

	Interurbans
		The direct-current traction motor proved to be as well-adapted to railway traction as the steam locomotive, giving high torque at low speeds and not requiring elaborate transmission mechanisms.
		The traction circuit was completed from the contact wire through the trolley pole and the motorman's platform controller to the traction motors beneath the car, and then through the wheels to the rails.
		The motors were series motors, meaning that the current passed through the stationary field windings to produce the magnetic field, then through the moving armature windings where the magnetic field produced the torque.
	www.du.edu /~jcalvert/railway/trolley.htm (13488 words)

	Diesel-Electric Engine Operation - NE Rails (Site not responding. Last check: 2007-10-22)
		The electrical power is routed from the DC generator on the older units to traction motors, usually 1 per axle, which are wired in series, parallel, or series-parallel depending on the throttle notch.
		When a motor is turned by the momentum of the train, it will produce power which is then dissipated by heating grids on the top of the locomotive similar to those in an electric toaster.
		On all locomotives with AC traction motors, whatever their power source: be it from a AC catenary system on an electric locomotive; or the AC alternator on modern Diesel-electric locomotives; they all rectified and regulated this power to a DC buss refered to as the DC Link.
	www.northeast.railfan.net /diesel_faq.html (1974 words)

	Electric Traction Drives (Site not responding. Last check: 2007-10-22)
		In railway traction terms, a quill drive is where a hollow shaft is placed round the driving axle and the motor drives the quill rather than driving the axle as it does with a nose suspended drive.
		The motor is fully suspended in the bogie frame and drives both axles through the gear train, which is contained in a single, large, oil filled gearcase (not shown).
		The efficiency of the linear motor is about 60% of the conventional motor but it has the advantage of less moving parts and it does not have the reliance on adhesion of the conventional motor.
	www.railway-technical.com /drives.html (1388 words)

	Class Definition for Class 290 - PRIME-MOVER DYNAMO PLANTS
		Electric-control traction prime-mover dynamo plants including a dynamo electric machine which acts as a motor for starting the prime mover and as a generator and has a field and armature, both of which rotate, and a prime mover provided with means for controlling the same.
		Electric-control traction prime-mover dynamo plants including a dynamo electric machine which acts as a motor to start the prime mover and as a generator and a prime mover which is provided with means for controlling the same.
		Electric-control traction prime-mover dynamo plants including a dynamo electric machine which acts as a motor for starting the prime mover and as a generator and an internal-combustion engine which is provided with special igniting means.
	www.uspto.gov /web/patents/classification/uspc290/defs290.htm (2289 words)

	TGVweb - "Under the Hood" of a TGV
		Between the pantograph and the traction motors of a TGV there is a whole set of power electronics with the task of "processing" a fixed voltage at the (single-phase AC or DC) catenary to produce a variable force at the wheel treads.
		The traction motors are still located where one would expect them: in between the truck (bogie) frames, level with the axles, but just suspended differently.
		Mechanical transmission: the output shaft of the motor is connected to the axle gearbox by a tripod transmission, using sliding cardan (universal-joint) shafts.
	www.trainweb.org /tgvpages/motrice.html (1738 words)

	Direct Current Traction Motor Systems (Site not responding. Last check: 2007-10-22)
		The DC motor was the mainstay of electric traction drives on both electric and diesel-electric for many years.
		The motor works because, simply put, when a current is passed through the motor circuit, there is a reaction between the current in the field and the current in the armature which causes the armature to turn.
		Since the DC motor and a DC generator are virtually the same machine mechanically, it was immediately realised that a train could use its motors to act as generators and that this would provide some braking effect if a suitable way could be found to dispose of the energy.
	www.railway-technical.com /tract-01.html (1699 words)

	SKF Evolution Online - Development of traction motor bearings
		Although improvement to traction motor bearings has been a continuing process over many years, there are a number of developments that are particularly relevant to modern bearing designs for traction motor applications.
		AC motors allow the development of traction motors with higher rotor speeds, greater compactness or increased power for a given size.
		Developing new generations of traction motor bearing units is a continuous process based on the ever-changing needs of operators and manufacturers.
	evolution.skf.com /zino.aspx?articleID=27&lan=en-gb (1165 words)

	The Other Side of The Tracks Message Board (Site not responding. Last check: 2007-10-22)
		As the motor turns, the commutator on the shaft turns and the brushes apply power to the "segmented commutator" so current flows in such a way for an angular rotation of the motor so that the magnetic field in the rotor is constantly "pushing" against the magnetic field in the stator coil(s)...
		A DC motor has two 'electromagnets.' One is fixed and doesn't move (the field.) The other rotates on an axle inside (the armature.) At the end of the armature is a set of contacts called the commutator.
		When DC power is applied to the traction motor, the field is a fixed magnet and the armature is repelled.
	www.nycrail.com /amb/board1/1955.html (661 words)

	Motor Age: Traction control: limited slip differential (Site not responding. Last check: 2007-10-22)
		As long as the wheels have the same traction, side thrust is zero and torque split is even.
		But when a wheel (sun gear) slows for a turn or loses traction, torque is reduced on that sun gear but multiplied by the side thrust of the planet gears and applied to the other wheel.
		Tiffs type of differential is commonly used in vehicles that use ABS for electronic traction control and also as the center differential in full-time four-wheel drive.
	www.findarticles.com /p/articles/mi_m3102/is_9_123/ai_n6221223 (1095 words)

	Proceco \| Integrated Cleaning Solutions \| Colossal Cleaning \| Traction Motor Washer
		The traction motor pre-cleaning system incorporates a transfer line to move pallets.
		Traction motors are mounted on a pallet with rotor 90° to direction of conveyor travel.
		A U-shaped spray hoop covers the traction motor frame and pinion end.
	www.proceco.com /colossal_cleaning/TractionMotorWasher.asp (39 words)

	Battery state of charge evaluator - Patent 4558281 (Site not responding. Last check: 2007-10-22)
		A system as claimed in claim 6, in which the current supply to the traction motor is restricted to a predetermined percentage of the current demanded by the driver, said predetermined percentage being progressively reduced as the state of charge falls from said predetermined value to zero.
		A method as claimed in claim 8, in which the current supply to the traction motor is restricted to a predetermined percentage of the current demanded by the driver, said predetermined percentage being progressively reduced as the state of charge falls from said predetermined value to zero.
		A combined motor control and battery state of charge evaluator system as claimed in claim 6 in which said predetermined value lower than the nominal maximum charge storage capacity of the battery when new is equal to 85% of said nominal maximum charge storage capacity.
	www.freepatentsonline.com /4558281.html (8114 words)

	Traction motor controller for forklift vehicles (US5070283)
		A field voltage amplifier is also provided for determining the direction of motor rotation and varying the voltage applied to the field winding.
		Apparatus for decoupling speed and torque of a dc motor having separately excited armature and field windings, said apparatus controlling motor speed of said dc motor independently of torque and torque independently of dc motor speed to the limit of the dc motor commutation curve, in combination, comprising:
		f) decoupling control means being operatively connected to said motor speed sensing means, to said armature voltage amplifying means and to said field voltage amplifying means for independently controlling the motor speed independently of torque and torque independently of said motor speed to the limit of the commutation curve of said dc motor.
	www.delphion.com /details?&pn=US05070283__ (438 words)

	Traction Electric Motor Drive
		The electric motors will play a fundamental role as the electrical to mechanical power conversion devices in the future vehicles.
		While the fuel cell based vehicles are likely to take many more years to mature, electric motor based energy conversion has the promise of improving the power conversion efficiency, hence improve the fuel efficiency of gasoline based vehicles.
		Furthermore, with electric motor based power delivery, it is possible to recover the regenerative energy during deceleration phases of motion (i.e.
	www.uic.edu /labs/mechatronics/traction.html (477 words)

	Rotomac History: A Constant Evolution (Site not responding. Last check: 2007-10-22)
		Rotomac was selected by the Indian Railways to become the exclusive repair house in the private sector to repair traction motors and generators of diesel electric locomotives.
		Rotomac becomes the second company in India to be able to carry out successfully, the type tests on Rotomac traction motors for main line electric locomotives as per IEC 349 both under DC and PC.
		Rotomac receives a contract for the repair of traction motors and generators from Bangladesh Railways and training of Bangladesh Railway workshop engineers and workers in the art and science of traction motor repairs.
	www.rotomacinternational.com /history.htm (864 words)

	Royal Purple China Star Bullet Train on Track Machinery Lubrication Magazine (Site not responding. Last check: 2007-10-22)
		The motors require the use of special insulated, resin-coated roller bearings, supplied by NSK Bearing Co. of Japan.
		The lubricants for the traction motor were selected based on tests previously conducted at NSK’s Tokyo research facility in its dedicated traction motor test equipment.
		Various adjustments to the motor itself were tried but the technical team was unsuccessful in finding a mechanical solution.
	www.royalpurple.com /machlub2/ml2p1.html (919 words)

	CEDRIC LYNCH DC PANCAKE ELECTRIC TRACTION MOTOR \| SOLAR NAVIGATOR CATAMARAN WORLD ELECTRIC NAVIGATION CHALLENGE - ...
		The motor produced was mated to an outboard motor shaft and his boat covered many more laps than any other boat that day.
		Of course such a revolutionary motor is not for every application - it is not as cheap as wound field motors, but for many applications it is a far superior motor.
		The Lynch motor is an important development which spurred other motor designers to improve their products to remain competitive, such as synchronus permanent magnet machines.
	www.solarnavigator.net /lynch_motor.htm (567 words)

	e-Traction® Direct Drive Technology (TheWheel™)
		The genius of TheWheel™ lies in the complete absence of power transfer through gearing of any kind and the use of an electromotor in the opposite manner in which it is customarily used.
		The exterior of the motor, the rotor - affixed with permanent magnets on the inside, spins around and the stator, which contains the electromagnets and remains stationary.
		The greater the diameter of the motor within the wheel, the greater the torque.
	www.e-traction.com /TheWheel.htm (827 words)

	Visteon Corporation: Power Electronics Unit and Traction Motor for Hybrid Electric Applications (Site not responding. Last check: 2007-10-22)
		Visteon has designed, developed and manufactured custom hybrid electric traction motors and power electronic units specifically for vehicle manufacturers.
		The traction motor is electrically-based and can be calibrated to provide supplemental drive torque for stop/start and torque boost strategies.
		Additionally, the electric traction motor can be used for regenerative braking.
	www.visteon.com /products/automotive/powerunit_tractionmotor.shtml (111 words)

	W&H MAIN YARDS: Traction Motors
		DC traction motors run on AC -- since early AC systems were low frequency, it was quite practical to run DC motors on AC power.
		There were several traction systems that used 3-phase and two trolley poles plus the track to carry the three lines.
		I also recall something about the Virginian using AC motors with multiple pole fields to give 2-speed operation on AC, but have forgotten what configuration the AC motors were to give starting torque.
	www.spikesys.com /Trains/traction.html (857 words)

	Down The Line
		Before acquiring the MCE system, the primary tools for traction motor testing were meghometers and DC high pots, which can be very dangerous because of the exposure to DC voltage.
		Now the MCE is Norfolk Southern’s primary testing device for traction motors, and, according to Gardner, since the MCE was introduced, short-time failures have decreased by 40 percent.
		The MCE Motor Tester collects and trends data such as resistance to ground, capacitance to ground, phase resistance and phase inductance.
	www.pdma.com /conrail.html (964 words)

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