110-615: The TGV Duplex is a French high-speed train of the TGV family, manufactured by Alstom , and operated by the French national railway company SNCF . They were the first TGV trainsets to use bi-level passenger carriages with a seating capacity of 508 passengers, increasing capacity on busy high-speed lines. While the TGV Duplex started as a small component of the TGV fleet, it has become one of
220-421: A n i c a l P o w e r ÷ I n p u t E l e c t r i c a l P o w e r {\displaystyle \eta =OutputMechanicalPower\div InputElectricalPower} Regulatory authorities in many countries have implemented legislation to encourage the manufacture and use of higher efficiency electric motors. Some legislation mandates
330-572: A bi-level arrangement, and later that year another TGV Sud-Est was modified to study the dynamic behavior of a train with a higher center of gravity. Discussions with GEC-Alstom began soon after, and in July 1990 the company won the contract to build the "TGV-2N", as it was then known. The contract was finalized in early 1991, at which point the official order was made. The first tests of a bi-level trainset were in November 1994. Soon after their first run,
440-405: A capacitor is used to generate a second power phase 90° from the single-phase supply and feeds it to the second motor winding. Single-phase motors require some mechanism to produce a rotating field on startup. Induction motors using a squirrel-cage rotor winding may have the rotor bars skewed slightly to smooth out torque in each revolution. Standardized NEMA & IEC motor frame sizes throughout
550-408: A carbody design that would reduce wind resistance at high speeds. A long series of tests was carried. In 1905, St. Louis Car Company built a railcar for the traction magnate Henry E. Huntington , capable of speeds approaching 160 km/h (100 mph). Once it ran 32 km (20 mi) between Los Angeles and Long Beach in 15 minutes, an average speed of 130 km/h (80 mph). However, it
660-439: A cross-licensing agreement for the bar-winding-rotor design, later called the squirrel-cage rotor. Arthur E. Kennelly was the first to bring out the full significance of complex numbers (using j to represent the square root of minus one) to designate the 90º rotation operator in analysis of AC problems. GE's Charles Proteus Steinmetz improved the application of AC complex quantities and developed an analytical model called
770-739: A fixed rotation unless a second set of shading windings is provided. The power factor of induction motors varies with load, typically from about 0.85 or 0.90 at full load to as low as about 0.20 at no-load, due to stator and rotor leakage and magnetizing reactances. Power factor can be improved by connecting capacitors either on an individual motor basis or, by preference, on a common bus covering several motors. For economic and other considerations, power systems are rarely power factor corrected to unity power factor. Power capacitor application with harmonic currents requires power system analysis to avoid harmonic resonance between capacitors and transformer and circuit reactances. Common bus power factor correction
880-578: A high-speed railway network in Russian gauge . There are no narrow gauge high-speed railways. Countries whose legacy network is entirely or mostly of a different gauge than 1435mm – including Japan and Spain – have however often opted to build their high speed lines to standard gauge instead of the legacy railway gauge. High-speed rail is the fastest and most efficient ground-based method of commercial transportation. However, due to requirements for large track curves, gentle gradients and grade separated track
990-577: A legal battle ending in damage payments for Eurotrain in 2004. High-speed rail High-speed rail ( HSR ) is a type of rail transport network utilizing trains that run significantly faster than those of traditional rail, using an integrated system of specialized rolling stock and dedicated tracks . While there is no single standard that applies worldwide, lines built to handle speeds above 250 km/h (155 mph) or upgraded lines in excess of 200 km/h (125 mph) are widely considered to be high-speed. The first high-speed rail system,
1100-546: A new top speed for a regular service, with a top speed of 160 km/h (99 mph). This train was a streamlined multi-powered unit, albeit diesel, and used Jakobs bogies . Following the success of the Hamburg line, the steam-powered Henschel-Wegmann Train was developed and introduced in June 1936 for service from Berlin to Dresden , with a regular top speed of 160 km/h (99 mph). Incidentally no train service since
1210-413: A non-self-starting reluctance motor , another with a wound rotor forming a self-starting induction motor, and the third a true synchronous motor with a separately excited DC supply to the rotor winding. George Westinghouse , who was developing an alternating current power system at that time, licensed Tesla's patents in 1888 and purchased a US patent option on Ferraris' induction motor concept. Tesla
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#17327806631211320-403: A rotating field to the motor. The normal running windings within such a single-phase motor can cause the rotor to turn in either direction, so the starting circuit determines the operating direction. In certain smaller single-phase motors, starting is done by means of a copper wire turn around part of a pole; such a pole is referred to as a shaded pole. The current induced in this turn lags behind
1430-460: A second stator winding fed with out-of-phase current; such currents may be created by feeding the winding through a capacitor or having it receive different values of inductance and resistance from the main winding. In capacitor-start designs, the second winding is disconnected once the motor is up to speed, usually either by a centrifugal switch acting on weights on the motor shaft or a thermistor which heats up and increases its resistance, reducing
1540-409: A single deck Réseau set or another Duplex set. The Duplex feasibility study was completed in 1987. In 1988, a full-scale mockup was built to gauge customer reactions to the bi-level concept, traditionally associated with commuter and regional rail rather than with high-speed intercity trains. A TGV Sud-Est trailer was tested in revenue service with the inside furnished to simulate the lower floor of
1650-555: A some other interurban rail cars reached about 145 km/h (90 mph) in commercial traffic. The Red Devils weighed only 22 tons though they could seat 44 passengers. Extensive wind tunnel research – the first in the railway industry – was done before J. G. Brill in 1931 built the Bullet cars for Philadelphia and Western Railroad (P&W). They were capable of running at 148 km/h (92 mph). Some of them were almost 60 years in service. P&W's Norristown High Speed Line
1760-410: A variable load. In 1824, the French physicist François Arago formulated the existence of rotating magnetic fields , termed Arago's rotations . By manually turning switches on and off, Walter Baily demonstrated this in 1879, effectively the first primitive induction motor. The first commutator -free single-phase AC induction motor was invented by Hungarian engineer Ottó Bláthy ; he used
1870-569: A world record for narrow gauge trains at 145 km/h (90 mph), giving the Odakyu engineers confidence they could safely and reliably build even faster trains at standard gauge. Conventional Japanese railways up until that point had largely been built in the 1,067 mm ( 3 ft 6 in ) Cape gauge , however widening the tracks to standard gauge ( 1,435 mm ( 4 ft 8 + 1 ⁄ 2 in )) would make very high-speed rail much simpler due to improved stability of
1980-401: Is a major cost disadvantage, especially for constant loads. Large slip ring motor drives, termed slip energy recovery systems, some still in use, recover energy from the rotor circuit, rectify it, and return it to the power system using a VFD. The speed of a pair of slip-ring motors can be controlled by a cascade connection, or concatenation. The rotor of one motor is connected to the stator of
2090-476: Is a set of unique features, not merely a train travelling above a particular speed. Many conventionally hauled trains are able to reach 200 km/h (124 mph) in commercial service but are not considered to be high-speed trains. These include the French SNCF Intercités and German DB IC . The criterion of 200 km/h (124 mph) is selected for several reasons; above this speed,
2200-420: Is defined as the difference between synchronous speed and operating speed, at the same frequency, expressed in rpm, or in percentage or ratio of synchronous speed. Thus where n s {\displaystyle n_{s}} is stator electrical speed, n r {\displaystyle n_{r}} is rotor mechanical speed. Slip, which varies from zero at synchronous speed and 1 when
2310-406: Is generally not practicable due to loading gauge restrictions. Running two trainsets coupled together in multiple-unit (MU) configuration provides extra capacity, but required very long station platforms . Given length and width restrictions, the remaining option is to adopt a bi-level configuration, with seating on two levels, adding 45% more passenger capacity. TGV Duplex sets are often run with
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#17327806631212420-846: Is obtained by electromagnetic induction from the magnetic field of the stator winding. An induction motor therefore needs no electrical connections to the rotor. An induction motor's rotor can be either wound type or squirrel-cage type. Three-phase squirrel-cage induction motors are widely used as industrial drives because they are self-starting, reliable, and economical. Single-phase induction motors are used extensively for smaller loads, such as garbage disposals and stationary power tools. Although traditionally used for constant-speed service, single- and three-phase induction motors are increasingly being installed in variable-speed applications using variable-frequency drives (VFD). VFD offers energy savings opportunities for induction motors in applications like fans, pumps, and compressors that have
2530-483: Is recommended to minimize resonant risk and to simplify power system analysis. Full-load motor efficiency ranges from 85–97%, with losses as follows: For an electric motor, the efficiency, represented by the Greek letter Eta, is defined as the quotient of the mechanical output power and the electric input power, calculated using this formula: η = O u t p u t M e c h
2640-435: Is separated by an air gap between the stator winding and the moving rotor winding. The equivalent circuit can accordingly be shown either with equivalent circuit components of respective windings separated by an ideal transformer or with rotor components referred to the stator side as shown in the following circuit and associated equation and parameter definition tables. The following rule-of-thumb approximations apply to
2750-539: Is still in use, almost 110 years after P&W in 1907 opened their double-track Upper Darby–Strafford line without a single grade crossing with roads or other railways. The entire line was governed by an absolute block signal system. On 15 May 1933, the Deutsche Reichsbahn-Gesellschaft company introduced the diesel-powered " Fliegender Hamburger " in regular service between Hamburg and Berlin (286 km or 178 mi), thereby achieving
2860-442: Is that torque is created solely by induction instead of the rotor being separately excited as in synchronous or DC machines or being self-magnetized as in permanent magnet motors . For rotor currents to be induced, the speed of the physical rotor must be lower than that of the stator's rotating magnetic field ( n s {\displaystyle n_{s}} ); otherwise the magnetic field would not be moving relative to
2970-462: Is the busiest high-speed line in France. After its opening in 1981 it rapidly reached capacity. Several options were available to increase capacity. The separation between trains was reduced to three minutes on some TGV lines, but the increasingly complex signalling systems, and high-performance brakes (to reduce braking distance ) required, limited this option. Another option is to widen the train but
3080-451: Is the number of north and south poles per phase. For example; a single-phase motor with 3 north and 3 south poles, having 6 poles per phase, is a 6-pole motor. A three-phase motor with 18 north and 18 south poles, having 6 poles per phase, is also a 6-pole motor. This industry standard method of counting poles results in the same synchronous speed for a given frequency regardless of polarity. Slip, s {\displaystyle s} ,
3190-594: Is the rotating stator magnetic field, so to oppose the change in rotor-winding currents the rotor turns in the direction of the stator magnetic field. The rotor accelerates until the magnitude of induced rotor current and torque balances the load on the rotor. Since rotation at synchronous speed does not induce rotor current, an induction motor always operates slightly slower than synchronous speed. The difference, or "slip," between actual and synchronous speed varies from about 0.5% to 5.0% for standard Design B torque curve induction motors. The induction motor's essential character
3300-535: Is the rotation rate of the stator's magnetic field, where f {\displaystyle f} is the frequency of the power supply, p {\displaystyle p} is the number of magnetic poles, and f s {\displaystyle f_{s}} is the synchronous speed of the machine. For f {\displaystyle f} in hertz and n s {\displaystyle n_{s}} synchronous speed in RPM ,
3410-469: Is transformed into useful mechanical energy output. The equivalent circuit is a single-phase representation of a multiphase induction motor that is valid in steady-state balanced-load conditions. The Steinmetz equivalent circuit is expressed simply in terms of the following components: Paraphrasing from Alger in Knowlton, an induction motor is simply an electrical transformer the magnetic circuit of which
TGV Duplex - Misplaced Pages Continue
3520-407: Is with VFDs. Barriers to adoption of VFDs due to cost and reliability considerations have been reduced considerably over the past three decades such that it is estimated that drive technology is adopted in as many as 30–40% of all newly installed motors. Variable frequency drives implement the scalar or vector control of an induction motor. With scalar control , only the magnitude and frequency of
3630-619: The Chicago-New York Electric Air Line Railroad project to reduce the running time between the two big cities to ten hours by using electric 160 km/h (99 mph) locomotives. After seven years of effort, however, less than 50 km (31 mi) of arrow-straight track was finished. A part of the line is still used as one of the last interurbans in the US. In the US, some of the interurbans (i.e. trams or streetcars which run from city to city) of
3740-553: The 0 Series Shinkansen , built by Kawasaki Heavy Industries – in English often called "Bullet Trains", after the original Japanese name Dangan Ressha ( 弾丸列車 ) – outclassed the earlier fast trains in commercial service. They traversed the 515 km (320 mi) distance in 3 hours 10 minutes, reaching a top speed of 210 km/h (130 mph) and sustaining an average speed of 162.8 km/h (101.2 mph) with stops at Nagoya and Kyoto. Speed
3850-681: The Aérotrain , a French hovercraft monorail train prototype, reached 200 km/h (120 mph) within days of operation. After the successful introduction of the Japanese Shinkansen in 1964, at 210 km/h (130 mph), the German demonstrations up to 200 km/h (120 mph) in 1965, and the proof-of-concept jet-powered Aérotrain , SNCF ran its fastest trains at 160 km/h (99 mph). In 1966, French Infrastructure Minister Edgard Pisani consulted engineers and gave
3960-590: The Marienfelde – Zossen line during 1902 and 1903 (see Experimental three-phase railcar ). On 23 October 1903, the S&;H-equipped railcar achieved a speed of 206.7 km/h (128.4 mph) and on 27 October the AEG-equipped railcar achieved 210.2 km/h (130.6 mph). These trains demonstrated the feasibility of electric high-speed rail; however, regularly scheduled electric high-speed rail travel
4070-647: The Morning Hiawatha service, hauled at 160 km/h (99 mph) by steam locomotives. In 1939, the largest railroad of the world, the Pennsylvania Railroad introduced a duplex steam engine Class S1 , which was designed to be capable of hauling 1200 tons passenger trains at 161 km/h (100 mph). The S1 engine was assigned to power the popular all-coach overnight premier train the Trail Blazer between New York and Chicago since
4180-545: The Prussian state railway joined with ten electrical and engineering firms and electrified 72 km (45 mi) of military owned railway between Marienfelde and Zossen . The line used three-phase current at 10 kilovolts and 45 Hz . The Van der Zypen & Charlier company of Deutz, Cologne built two railcars, one fitted with electrical equipment from Siemens-Halske , the second with equipment from Allgemeine Elektrizitäts-Gesellschaft (AEG), that were tested on
4290-532: The Royal Academy of Science of Turin published Ferraris's research on his AC polyphase motor detailing the foundations of motor operation. In May 1888 Tesla presented the technical paper A New System for Alternating Current Motors and Transformers to the American Institute of Electrical Engineers (AIEE) describing three four-stator-pole motor types: one having a four-pole rotor forming
4400-729: The Tōkaidō Shinkansen , began operations in Honshu , Japan, in 1964. Due to the streamlined spitzer -shaped nose cone of the trains , the system also became known by its English nickname bullet train . Japan's example was followed by several European countries, initially in Italy with the Direttissima line, followed shortly thereafter by France , Germany , and Spain . Today, much of Europe has an extensive network with numerous international connections. More recent construction since
4510-532: The United Kingdom , the United States , and Uzbekistan . Only in continental Europe and Asia does high-speed rail cross international borders. High-speed trains mostly operate on standard gauge tracks of continuously welded rail on grade-separated rights of way with large radii . However, certain regions with wider legacy railways , including Russia and Uzbekistan, have sought to develop
TGV Duplex - Misplaced Pages Continue
4620-474: The World Bank , whilst supporting the project, considered the design of the equipment as unproven for that speed, and set the maximum speed to 210 km/h (130 mph). After initial feasibility tests, the plan was fast-tracked and construction of the first section of the line started on 20 April 1959. In 1963, on the new track, test runs hit a top speed of 256 km/h (159 mph). Five years after
4730-630: The asynchronous motors , first used on the Eurostar e300 trainsets, which allow an individual motor in a bogie to be isolated (disconnected) in case of failure, allowing the train to continue to operate. Second was the addition of the European Rail Traffic Management System (ERTMS). A total of 50 Dasye trainsets were ordered, with a prototype power car first delivered in late 2006 for testing, before entering service on 14 February 2008. Starting in 2013, many of
4840-563: The 19 Réseau Duplex trainsets. The tri-current function was necessary for the LGV Est , which ends at the German border, where the electrification switches to the 15 kV 16.7 Hz AC system. Meanwhile, the heavily congested lines where the Réseau trainsets were used needed the additional passenger capacity provided by the Duplex passenger carriages. The project allowed SNCF to receive
4950-573: The 21st century has led to China taking a leading role in high-speed rail. As of 2023 , China's HSR network accounted for over two-thirds of the world's total. In addition to these, many other countries have developed high-speed rail infrastructure to connect major cities, including: Austria , Belgium , Denmark , Finland , Greece , Indonesia , Morocco , the Netherlands , Norway , Poland , Portugal , Russia , Saudi Arabia , Serbia , South Korea , Sweden , Switzerland , Taiwan , Turkey ,
5060-472: The AC oscillations. Whereas a synchronous motor's rotor turns at the same rate as the stator field, an induction motor's rotor rotates at a somewhat slower speed than the stator field. The induction motor stator's magnetic field is therefore changing or rotating relative to the rotor. This induces an opposing current in the rotor, in effect the motor's secondary winding. The rotating magnetic flux induces currents in
5170-524: The Dasye trainsets have been reconfigured for use on SNCF's low-cost Ouigo service. These trains use a high-density layout, which can carry 20% more passengers (644 passengers, compared to 510 on a standard trainset). The extra seating is enabled by the elimination of the bar car and first-class cars, and the use of slimline seats. By 2021, 38 Dasye trainsets have been converted for Ouigo service, with all 50 trainsets expected to be converted by 2025. Eurotrain
5280-642: The French National Railway started to receive their new powerful CC 7100 electric locomotives, and began to study and evaluate running at higher speeds. In 1954, the CC 7121 hauling a full train achieved a record 243 km/h (151 mph) during a test on standard track. The next year, two specially tuned electric locomotives, the CC 7107 and the prototype BB 9004, broke previous speed records, reaching respectively 320 km/h (200 mph) and 331 km/h (206 mph), again on standard track. For
5390-565: The French National Railways twelve months to raise speeds to 200 km/h (120 mph). The classic line Paris– Toulouse was chosen, and fitted, to support 200 km/h (120 mph) rather than 140 km/h (87 mph). Some improvements were set, notably the signals system, development of on board "in-cab" signalling system, and curve revision. The next year, in May 1967, a regular service at 200 km/h (120 mph)
5500-457: The TGV Duplex order. For the POS project, Alstom delivered to SNCF 38 new tri-current power cars and 19 sets of double-deck Duplex passenger carriages in 2006. The new tri-current power cars were paired with the 19 sets of older single-level passenger carriages from TGV Réseau trainsets, while the new double-deck Duplex passenger carriages were paired with the 38 older dual-current power cars, creating
5610-606: The US, 160 km/h (99 mph) in Germany and 125 mph (201 km/h) in Britain. Above those speeds positive train control or the European Train Control System becomes necessary or legally mandatory. National domestic standards may vary from the international ones. Railways were the first form of rapid land transportation and had an effective monopoly on long-distance passenger traffic until
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#17327806631215720-579: The beginning of the construction work, in October 1964, just in time for the Olympic Games , the first modern high-speed rail, the Tōkaidō Shinkansen , was opened between the two cities; a 510 km (320 mi) line between Tokyo and Ōsaka. As a result of its speeds, the Shinkansen earned international publicity and praise, and it was dubbed the "bullet train." The first Shinkansen trains,
5830-409: The best solution. The typical speed-torque relationship of a standard NEMA Design B polyphase induction motor is as shown in the curve at right. Suitable for most low performance loads such as centrifugal pumps and fans, Design B motors are constrained by the following typical torque ranges: Over a motor's normal load range, the torque's slope is approximately linear or proportional to slip because
5940-443: The cancelation of this express train in 1939 has traveled between the two cities in a faster time as of 2018 . In August 2019, the travel time between Dresden-Neustadt and Berlin-Südkreuz was 102 minutes. See Berlin–Dresden railway . Further development allowed the usage of these "Fliegenden Züge" (flying trains) on a rail network across Germany. The "Diesel-Schnelltriebwagen-Netz" (diesel high-speed-vehicle network) had been in
6050-562: The construction of high-speed rail is more costly than conventional rail and therefore does not always present an economical advantage over conventional speed rail. Multiple definitions for high-speed rail are in use worldwide. The European Union Directive 96/48/EC, Annex 1 (see also Trans-European high-speed rail network ) defines high-speed rail in terms of: The International Union of Railways (UIC) identifies three categories of high-speed rail: A third definition of high-speed and very high-speed rail requires simultaneous fulfilment of
6160-727: The current through the second winding to an insignificant level. The capacitor-run designs keep the second winding on when running, improving torque. A resistance start design uses a starter inserted in series with the startup winding, creating reactance. Self-starting polyphase induction motors produce torque even at standstill. Available squirrel-cage induction motor starting methods include direct-on-line starting, reduced-voltage reactor or auto-transformer starting, star-delta starting or, increasingly, new solid-state soft assemblies and, of course, variable frequency drives (VFDs). Polyphase motors have rotor bars shaped to give different speed-torque characteristics. The current distribution within
6270-464: The curve radius should be quadrupled; the same was true for the acceleration and braking distances. In 1891 engineer Károly Zipernowsky proposed a high-speed line from Vienna to Budapest for electric railcars at 250 km/h (160 mph). In 1893 Wellington Adams proposed an air-line from Chicago to St. Louis of 252 miles (406 km), at a speed of only 160 km/h (99 mph). Alexander C. Miller had greater ambitions. In 1906, he launched
6380-603: The deputy director Marcel Tessier at the DETE ( SNCF Electric traction study department). JNR engineers returned to Japan with a number of ideas and technologies they would use on their future trains, including alternating current for rail traction, and international standard gauge. In 1957, the engineers at the private Odakyu Electric Railway in Greater Tokyo Area launched the Odakyu 3000 series SE EMU. This EMU set
6490-450: The development of semiconductor power electronics , it was difficult to vary the frequency, and cage induction motors were mainly used in fixed speed applications. Applications such as electric overhead cranes used DC drives or wound rotor motors (WRIM) with slip rings for rotor circuit connection to variable external resistance allowing considerable range of speed control. However, resistor losses associated with low speed operation of WRIMs
6600-508: The development of the motor car and airliners in the early-mid 20th century. Speed had always been an important factor for railroads and they constantly tried to achieve higher speeds and decrease journey times. Rail transportation in the late 19th century was not much slower than non-high-speed trains today, and many railroads regularly operated relatively fast express trains which averaged speeds of around 100 km/h (62 mph). High-speed rail development began in Germany in 1899 when
6710-431: The direction of rotation of an induction motor depends on whether it is a three-phase or single-phase machine. A three-phase motor can be reversed by swapping any two of its phase connections. Motors required to change direction regularly (such as hoists) will have extra switching contacts in their controller to reverse rotation as needed. A variable frequency drive nearly always permits reversal by electronically changing
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#17327806631216820-471: The double-decker design has improvements in both power-to-weight ratio and weight-per-seat overhead: In this comparison, "power" refers to installed power, not all of which is used when operating. Also unique compared to single-level equipment, the lower level of the bar car is used for equipment, moving them out of passenger spaces. The Réseau Duplex was part of the TGV POS project, a unique extension of
6930-595: The early 20th century were very high-speed for their time (also Europe had and still does have some interurbans). Several high-speed rail technologies have their origin in the interurban field. In 1903 – 30 years before the conventional railways started to streamline their trains – the officials of the Louisiana Purchase Exposition organised the Electric Railway Test Commission to conduct a series of tests to develop
7040-481: The first rake of eight trailers was tested at 290 km/h (180 mph) on the Sud-Est line. The trainset was powered by TGV Réseau power cars at the time, as the Duplex power cars were not ready. The first Duplex power car was mated to the bi-level trailers on 21 June 1995. Perhaps the most important innovation is the efficiency of the Duplex design. Comparing an original TGV Sud-Est and a Duplex trainset shows that
7150-438: The first time, 300 km/h (185 mph) was surpassed, allowing the idea of higher-speed services to be developed and further engineering studies commenced. Especially, during the 1955 records, a dangerous hunting oscillation , the swaying of the bogies which leads to dynamic instability and potential derailment was discovered. This problem was solved by yaw dampers which enabled safe running at high speeds today. Research
7260-575: The following two conditions: The UIC prefers to use "definitions" (plural) because they consider that there is no single standard definition of high-speed rail, nor even standard usage of the terms ("high speed", or "very high speed"). They make use of the European EC Directive 96/48, stating that high speed is a combination of all the elements which constitute the system: infrastructure, rolling stock and operating conditions. The International Union of Railways states that high-speed rail
7370-501: The formula becomes: For example, for a four-pole, three-phase motor, p {\displaystyle p} = 4 and n s = 120 f 4 {\displaystyle n_{s}={120f \over 4}} = 1,500 RPM (for f {\displaystyle f} = 50 Hz) and 1,800 RPM (for f {\displaystyle f} = 60 Hz) synchronous speed. The number of magnetic poles, p {\displaystyle p} ,
7480-504: The future use of premium-efficiency induction motors in certain equipment. For more information, see: Premium efficiency . Many useful motor relationships between time, current, voltage, speed, power factor, and torque can be obtained from analysis of the Steinmetz equivalent circuit (also termed T-equivalent circuit or IEEE recommended equivalent circuit), a mathematical model used to describe how an induction motor's electrical input
7590-414: The impacts of geometric defects are intensified, track adhesion is decreased, aerodynamic resistance is greatly increased, pressure fluctuations within tunnels cause passenger discomfort, and it becomes difficult for drivers to identify trackside signalling. Standard signaling equipment is often limited to speeds below 200 km/h (124 mph), with the traditional limits of 127 km/h (79 mph) in
7700-410: The induction motor Steinmetz equivalent circuit . Induction motor improvements flowing from these inventions and innovations were such that a modern 100- horsepower induction motor has the same mounting dimensions as a 7.5-horsepower motor in 1897. In both induction and synchronous motors , the AC power supplied to the motor's stator creates a magnetic field that rotates in synchronism with
7810-487: The induction motor in parallel with a synchronous motor serving as a power factor compensator. A feature in the generator mode in parallel to the grid is that the rotor speed is higher than in the driving mode. Then active energy is being given to the grid. Another disadvantage of the induction motor generator is that it consumes a significant magnetizing current I 0 = (20–35)%. An AC motor's synchronous speed, f s {\displaystyle f_{s}} ,
7920-423: The industry result in interchangeable dimensions for shaft, foot mounting, general aspects as well as certain motor flange aspect. Since an open, drip proof (ODP) motor design allows a free air exchange from outside to the inner stator windings, this style of motor tends to be slightly more efficient because the windings are cooler. At a given power rating, lower speed requires a larger frame. The method of changing
8030-461: The initial ones despite greater speeds). After decades of research and successful testing on a 43 km (27 mi) test track, in 2014 JR Central began constructing a Maglev Shinkansen line, which is known as the Chūō Shinkansen . These Maglev trains still have the traditional underlying tracks and the cars have wheels. This serves a practical purpose at stations and a safety purpose out on
8140-555: The intermediate cars of TGV Duplex trainset #224 was joined with German Railways ICE 2 powerheads 402 042 and 402 046 at the two ends. On 4 May 1998, the Eurotrain demonstration train made a presentation run on the Hanover–Würzburg high-speed railway in Germany, achieving a maximum speed of 316 km/h (196 mph). In December 2000, THSRC awarded the contract to the rival Taiwan Shinkansen Consortium, leading to
8250-542: The late 1940s and it consistently reached 161 km/h (100 mph) in its service life. These were the last "high-speed" trains to use steam power. In 1936, the Twin Cities Zephyr entered service, from Chicago to Minneapolis, with an average speed of 101 km/h (63 mph). Many of these streamliners posted travel times comparable to or even better than their modern Amtrak successors, which are limited to 127 km/h (79 mph) top speed on most of
8360-432: The lines in the event of a power failure. However, in normal operation, the wheels are raised up into the car as the train reaches certain speeds where the magnetic levitation effect takes over. It will link Tokyo and Osaka by 2037, with the section from Tokyo to Nagoya expected to be operational by 2027. Maximum speed is anticipated at 505 km/h (314 mph). The first generation train can be ridden by tourists visiting
8470-450: The load torque increases beyond breakdown torque the motor stalls. There are three basic types of small induction motors: split-phase single-phase, shaded-pole single-phase, and polyphase. In two-pole single-phase motors, the torque goes to zero at 100% slip (zero speed), so these require alterations to the stator such as shaded-poles to provide starting torque. A single phase induction motor requires separate starting circuitry to provide
8580-409: The need to excite the rotor, which begins with only residual magnetization. In some cases, that residual magnetization is enough to self-excite the motor under load. Therefore, it is necessary to either snap the motor and connect it momentarily to a live grid or to add capacitors charged initially by residual magnetism and providing the required reactive power during operation. Similar is the operation of
8690-505: The network. The German high-speed service was followed in Italy in 1938 with an electric-multiple-unit ETR 200 , designed for 200 km/h (120 mph), between Bologna and Naples. It too reached 160 km/h (99 mph) in commercial service, and achieved a world mean speed record of 203 km/h (126 mph) between Florence and Milan in 1938. In Great Britain in the same year, the streamlined steam locomotive Mallard achieved
8800-469: The official world speed record for steam locomotives at 202.58 km/h (125.88 mph). The external combustion engines and boilers on steam locomotives were large, heavy and time and labor-intensive to maintain, and the days of steam for high speed were numbered. In 1945, a Spanish engineer, Alejandro Goicoechea , developed a streamlined, articulated train that was able to run on existing tracks at higher speeds than contemporary passenger trains. This
8910-575: The other. If the two motors are also mechanically connected, they will run at half speed. This system was once widely used in three-phase AC railway locomotives, such as FS Class E.333 . By the turn of this century, however, such cascade-based electromechanical systems became much more efficiently and economically solved using power semiconductor elements solutions. In many industrial variable-speed applications, DC and WRIM drives are being displaced by VFD-fed cage induction motors. The most common efficient way to control asynchronous motor speed of many loads
9020-428: The phase sequence of voltage applied to the motor. In a single-phase split-phase motor, reversal is achieved by reversing the connections of the starting winding. Some motors bring out the start winding connections to allow selection of rotation direction at installation. If the start winding is permanently connected within the motor, it is impractical to reverse the sense of rotation. Single-phase shaded-pole motors have
9130-608: The planning since 1934 but it never reached its envisaged size. All high-speed service stopped in August 1939 shortly before the outbreak of World War II . On 26 May 1934, one year after Fliegender Hamburger introduction, the Burlington Railroad set an average speed record on long distance with their new streamlined train, the Zephyr , at 124 km/h (77 mph) with peaks at 185 km/h (115 mph). The Zephyr
9240-607: The requirement for a more powerful controller. The stator of an induction motor consists of poles carrying supply current to induce a magnetic field that penetrates the rotor. To optimize the distribution of the magnetic field, windings are distributed in slots around the stator, with the magnetic field having the same number of north and south poles. Induction motors are most commonly run on single-phase or three-phase power, but two-phase motors exist; in theory, induction motors can have any number of phases. Many single-phase motors having two windings can be viewed as two-phase motors, since
9350-741: The rotor bars varies depending on the frequency of the induced current. At standstill, the rotor current is the same frequency as the stator current, and tends to travel at the outermost parts of the cage rotor bars (by skin effect ). The different bar shapes can give usefully different speed-torque characteristics as well as some control over the inrush current at startup. Although polyphase motors are inherently self-starting, their starting and pull-up torque design limits must be high enough to overcome actual load conditions. In wound rotor motors, rotor circuit connection through slip rings to external resistances allows change of speed-torque characteristics for acceleration control and speed control purposes. Before
9460-401: The rotor conductors and no currents would be induced. As the speed of the rotor drops below synchronous speed, the rotation rate of the magnetic field in the rotor increases, inducing more current in the windings and creating more torque. The ratio between the rotation rate of the magnetic field induced in the rotor and the rotation rate of the stator's rotating field is called "slip". Under load,
9570-506: The rotor is stalled, determines the motor's torque. Since the short-circuited rotor windings have small resistance, even a small slip induces a large current in the rotor and produces significant torque. At full rated load, slip varies from more than 5% for small or special purpose motors to less than 1% for large motors. These speed variations can cause load-sharing problems when differently sized motors are mechanically connected. Various methods are available to reduce slip, VFDs often offering
9680-404: The rotor windings, in a manner similar to currents induced in a transformer 's secondary winding(s). The induced currents in the rotor windings in turn create magnetic fields in the rotor that react against the stator field. The direction of the rotor magnetic field opposes the change in current through the rotor windings, following Lenz's Law . The cause of induced current in the rotor windings
9790-424: The single-phase motor to propel his invention, the electricity meter . The first AC commutator-free polyphase induction motors were independently invented by Galileo Ferraris and Nikola Tesla , a working motor model having been demonstrated by the former in 1885 and by the latter in 1887. Tesla applied for US patents in October and November 1887 and was granted some of these patents in May 1888. In April 1888,
9900-399: The speed drops and the slip increases enough to create sufficient torque to turn the load. For this reason, induction motors are sometimes referred to as "asynchronous motors". An induction motor can be used as an induction generator , or it can be unrolled to form a linear induction motor which can directly generate linear motion. The generating mode for induction motors is complicated by
10010-485: The supply current, creating a delayed magnetic field around the shaded part of the pole face. This imparts sufficient rotational field energy to start the motor. These motors are typically used in applications such as desk fans and record players, as the required starting torque is low, and the low efficiency is tolerable relative to the reduced cost of the motor and starting method compared to other AC motor designs. Larger single phase motors are split-phase motors and have
10120-416: The supply voltage are controlled without phase control (absent feedback by rotor position). Scalar control is suitable for application where the load is constant. Vector control allows independent control of the speed and torque of the motor, making it possible to maintain a constant rotation speed at varying load torque. But vector control is more expensive because of the cost of the sensor (not always) and
10230-466: The system's workhorses. A total of 160 Duplex trainsets were built: the original order of 89 first constructed in 1995, an additional 19 Réseau Duplex trainsets created as an extension of the TGV POS project in 2006, and 52 second-generation Dasye trainsets were first delivered in 2007 with revised traction motors and safety systems. The Duplex design was further refined into the third generation Euroduplex . The LGV Sud-Est from Paris to Lyon
10340-535: The test track. China is developing two separate high-speed maglev systems. In Europe, high-speed rail began during the International Transport Fair in Munich in June 1965, when Dr Öpfering, the director of Deutsche Bundesbahn (German Federal Railways), performed 347 demonstrations at 200 km/h (120 mph) between Munich and Augsburg by DB Class 103 hauled trains. The same year
10450-472: The tri-current power cars needed ahead of the opening of the LGV Est, without slowing the production of the Duplex trainsets. Dasye is a contraction of Duplex Asynchronous ERTMS and are the second generation of Duplex trains. In exterior design and passenger cabin experience, they are nearly identical to the first-generation Duplex trains, however, two major changes were made inside the power cars. First were
10560-460: The value of rotor resistance divided by slip, R r ′ / s {\displaystyle R_{r}'/s} , dominates torque in a linear manner. As load increases above rated load, stator and rotor leakage reactance factors gradually become more significant in relation to R r ′ / s {\displaystyle R_{r}'/s} such that torque gradually curves towards breakdown torque. As
10670-540: The wider rail gauge, and thus standard gauge was adopted for high-speed service. With the sole exceptions of Russia, Finland, and Uzbekistan all high-speed rail lines in the world are still standard gauge, even in countries where the preferred gauge for legacy lines is different. The new service, named Shinkansen (meaning new main line ) would provide a new alignment, 25% wider standard gauge utilising continuously welded rails between Tokyo and Osaka with new rolling stock, designed for 250 km/h (160 mph). However,
10780-629: The world's population, without a single train passenger fatality. (Suicides, passengers falling off the platforms, and industrial accidents have resulted in fatalities.) Since their introduction, Japan's Shinkansen systems have been undergoing constant improvement, not only increasing line speeds. Over a dozen train models have been produced, addressing diverse issues such as tunnel boom noise, vibration, aerodynamic drag , lines with lower patronage ("Mini shinkansen"), earthquake and typhoon safety, braking distance , problems due to snow, and energy consumption (newer trains are twice as energy-efficient as
10890-482: Was a consortium formed by Siemens and GEC-Alsthom (today Alstom ) in 1996 to market high-speed rail technology in Asia. In 1997, it was one of two competitors to supply the core system of Taiwan High Speed Rail (THSR), and was awarded the status of preferred bidder by concessionaire THSRC. In early 1998, the consortium created a demonstration train by combining cars of three existing French and German high-speed trains:
11000-470: Was achieved by providing the locomotive and cars with a unique axle system that used one axle set per car end, connected by a Y-bar coupler. Amongst other advantages, the centre of mass was only half as high as usual. This system became famous under the name of Talgo ( Tren Articulado Ligero Goicoechea Oriol ), and for half a century was the main Spanish provider of high-speed trains. In the early 1950s,
11110-405: Was also employed for one year as a consultant. Westinghouse employee C. F. Scott was assigned to assist Tesla and later took over development of the induction motor at Westinghouse. Steadfast in his promotion of three-phase development, Mikhail Dolivo-Dobrovolsky invented the cage-rotor induction motor in 1889 and the three-limb transformer in 1890. Furthermore, he claimed that Tesla's motor
11220-530: Was also made about "current harnessing" at high-speed by the pantographs, which was solved 20 years later by the Zébulon TGV 's prototype. With some 45 million people living in the densely populated Tokyo– Osaka corridor, congestion on road and rail became a serious problem after World War II , and the Japanese government began thinking about ways to transport people in and between cities. Because Japan
11330-403: Was extended a further 161 km (100 mi), and further construction has resulted in the network expanding to 2,951 km (1,834 mi) of high speed lines as of 2024, with a further 211 km (131 mi) of extensions currently under construction and due to open in 2031. The cumulative patronage on the entire system since 1964 is over 10 billion, the equivalent of approximately 140% of
11440-488: Was inaugurated by the TEE Le Capitole between Paris and Toulouse , with specially adapted SNCF Class BB 9200 locomotives hauling classic UIC cars, and a full red livery. It averaged 119 km/h (74 mph) over the 713 km (443 mi). Induction motors An induction motor or asynchronous motor is an AC electric motor in which the electric current in the rotor that produces torque
11550-543: Was made of stainless steel and, like the Fliegender Hamburger, was diesel powered, articulated with Jacobs bogies , and could reach 160 km/h (99 mph) as commercial speed. The new service was inaugurated 11 November 1934, traveling between Kansas City and Lincoln , but at a lower speed than the record, on average speed 74 km/h (46 mph). In 1935, the Milwaukee Road introduced
11660-407: Was not only a part of the Shinkansen revolution: the Shinkansen offered high-speed rail travel to the masses. The first Bullet trains had 12 cars and later versions had up to 16, and double-deck trains further increased the capacity. After three years, more than 100 million passengers had used the trains, and the milestone of the first one billion passengers was reached in 1976. In 1972, the line
11770-531: Was not practical because of two-phase pulsations, which prompted him to persist in his three-phase work. Although Westinghouse achieved its first practical induction motor in 1892 and developed a line of polyphase 60 hertz induction motors in 1893, these early Westinghouse motors were two-phase motors with wound rotors until B. G. Lamme developed a rotating bar winding rotor. The General Electric Company (GE) began developing three-phase induction motors in 1891. By 1896, General Electric and Westinghouse signed
11880-472: Was resource limited and did not want to import petroleum for security reasons, energy-efficient high-speed rail was an attractive potential solution. Japanese National Railways (JNR) engineers began to study the development of a high-speed regular mass transit service. In 1955, they were present at the Lille 's Electrotechnology Congress in France, and during a 6-month visit, the head engineer of JNR accompanied
11990-402: Was still more than 30 years away. After the breakthrough of electric railroads, it was clearly the infrastructure – especially the cost of it – which hampered the introduction of high-speed rail. Several disasters happened – derailments, head-on collisions on single-track lines, collisions with road traffic at grade crossings, etc. The physical laws were well-known, i.e. if the speed was doubled,
12100-477: Was too heavy for much of the tracks, so Cincinnati Car Company , J. G. Brill and others pioneered lightweight constructions, use of aluminium alloys, and low-level bogies which could operate smoothly at extremely high speeds on rough interurban tracks. Westinghouse and General Electric designed motors compact enough to be mounted on the bogies. From 1930 on, the Red Devils from Cincinnati Car Company and
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