Misplaced Pages

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77-551: Wilderness areas do not allow motorized or mechanical equipment, including bicycles , hang-gliders, wagons, chainsaws, and game carts. Although camping and fishing are allowed with proper permits, no roads or buildings are constructed, and no logging or mining allowed, in compliance with the 1964 Wilderness Act . Wilderness areas within National Forests and Bureau of Land Management areas also allow hunting in season. There are 700 miles (1,100 km) of trails in

154-399: A ferromagnetic core. Electric current passing through the wire causes the magnetic field to exert a force ( Lorentz force ) on it, turning the rotor. Windings are coiled wires, wrapped around a laminated, soft, iron, ferromagnetic core so as to form magnetic poles when energized with current. Electric machines come in salient- and nonsalient-pole configurations. In a salient-pole motor

231-430: A magnetic field that passes through the rotor armature, exerting force on the rotor windings. The stator core is made up of many thin metal sheets that are insulated from each other, called laminations. These laminations are made of electrical steel , which has a specified magnetic permeability, hysteresis, and saturation. Laminations reduce losses that would result from induced circulating eddy currents that would flow if

308-404: A 100- horsepower induction motor currently has the same mounting dimensions as a 7.5-horsepower motor in 1897. In 2022, electric motor sales were estimated to be 800 million units, increasing by 10% annually. Electric motors consume ≈50% of the world's electricity. Since the 1980s, the market share of DC motors has declined in favor of AC motors. An electric motor has two mechanical parts:

385-431: A 20-hp squirrel cage and a 100-hp wound rotor with a starting rheostat. These were the first three-phase asynchronous motors suitable for practical operation. Since 1889, similar developments of three-phase machinery were started Wenström. At the 1891 Frankfurt International Electrotechnical Exhibition, the first long distance three-phase system was successfully presented. It was rated 15 kV and extended over 175 km from

462-464: A commutator-type direct-current electric motor was built by American inventors Thomas Davenport and Emily Davenport , which he patented in 1837. The motors ran at up to 600 revolutions per minute, and powered machine tools and a printing press. Due to the high cost of primary battery power , the motors were commercially unsuccessful and bankrupted the Davenports. Several inventors followed Sturgeon in

539-463: A comparatively small air gap. The St. Louis motor, long used in classrooms to illustrate motor principles, is inefficient for the same reason, as well as appearing nothing like a modern motor. Electric motors revolutionized industry. Industrial processes were no longer limited by power transmission using line shafts, belts, compressed air or hydraulic pressure. Instead, every machine could be equipped with its own power source, providing easy control at

616-507: A fleet of 1.1 million natural gas vehicles as of December 2011 . As of January 2011, the Australian motor vehicle fleet had 16.4 million registered vehicles, with an ownership rate of 730 motor vehicles per 1000 people, up from 696 vehicles per 1000 residents in 2006. The motor vehicle fleet grew 14.5% since 2006, for an annual rate of 2.7% during this five-year period. The following table compares vehicle ownership rates by region with

693-570: A fleet of 779,090 natural gas vehicles as of June 2012 , the largest NGV fleet in Europe. Sweden, with 225,000 flexible-fuel vehicles, has the largest flexifuel fleet in Europe by mid-2011. More than one million plug-in electric passenger cars and vans have been registered in Europe by June 2018, the world's second largest regional plug-in stock after China. Norway is the leading plug-in market in Europe with almost 500,000 units registered as of December 2020 . In October 2018, Norway became

770-456: A fleet of over 256 million in 2008, and passenger cars accounted for 87% of the union's fleet. The five largest markets, Germany (17.7%), Italy (15.4%), France (13.3%), the UK (12.5%), and Spain (9.5%), accounted for 68% of the region's total registered fleet in 2008. The EU-27 member countries had in 2009 an estimated ownership rate of 473 passenger cars per 1000 people. According to Ward's, Italy had

847-422: A generator and the other as motor. The drum rotor was introduced by Friedrich von Hefner-Alteneck of Siemens & Halske to replace Pacinotti's ring armature in 1872, thus improving the machine efficiency. The laminated rotor was introduced by Siemens & Halske the following year, achieving reduced iron losses and increased induced voltages. In 1880, Jonas Wenström provided the rotor with slots for housing

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924-437: A model electric vehicle that same year. A major turning point came in 1864, when Antonio Pacinotti first described the ring armature (although initially conceived in a DC generator, i.e. a dynamo). This featured symmetrically grouped coils closed upon themselves and connected to the bars of a commutator, the brushes of which delivered practically non-fluctuating current. The first commercially successful DC motors followed

1001-1037: A power grid, inverters or electrical generators. Electric motors may be classified by considerations such as power source type, construction, application and type of motion output. They can be brushed or brushless , single-phase , two-phase , or three-phase , axial or radial flux , and may be air-cooled or liquid-cooled. Standardized motors provide power for industrial use. The largest are used for ship propulsion, pipeline compression and pumped-storage applications, with output exceeding 100 megawatts . Applications include industrial fans, blowers and pumps, machine tools, household appliances, power tools, vehicles, and disk drives. Small motors may be found in electric watches. In certain applications, such as in regenerative braking with traction motors , electric motors can be used in reverse as generators to recover energy that might otherwise be lost as heat and friction. Electric motors produce linear or rotary force ( torque ) intended to propel some external mechanism. This makes them

1078-424: A rate of 1:6.63 vehicles to people. The global rate of motorization increased in 2013 to 174 vehicles per 1000 people. In developing countries vehicle ownership rates rarely exceed 200 cars per 1,000 population. The following table summarizes the evolution of motor vehicle registrations in the world from 1960 to 2019: Since the early 2000s, the number of alternative fuel vehicles has been increasing driven by

1155-425: A rotating bar winding rotor. Steadfast in his promotion of three-phase development, Mikhail Dolivo-Dobrovolsky invented the three-phase induction motor in 1889, of both types cage-rotor and wound rotor with a starting rheostat, and the three-limb transformer in 1890. After an agreement between AEG and Maschinenfabrik Oerlikon , Doliwo-Dobrowolski and Charles Eugene Lancelot Brown developed larger models, namely

1232-398: A solid core were used. Mains powered AC motors typically immobilize the wires within the windings by impregnating them with varnish in a vacuum. This prevents the wires in the winding from vibrating against each other which would abrade the wire insulation and cause premature failures. Resin-packed motors, used in deep well submersible pumps, washing machines, and air conditioners, encapsulate

1309-632: A total of 1.69 million natural gas vehicles. In addition, all the Brazilian gasoline-powered fleet is designed to operate with high ethanol blends, up to 25% ethanol fuel ( E25 ). The market share of flex fuel vehicles reached 88.6% of all light-duty vehicles registered in 2017. India's vehicle fleet had the second-largest growth rate after China in 2010, with 8.9%. The fleet went from 19.1 million in 2009 to 20.8 million units in 2010. India's vehicle fleet has increased to 210 million in March 2015. India has

1386-579: A type of actuator . They are generally designed for continuous rotation, or for linear movement over a significant distance compared to its size. Solenoids also convert electrical power to mechanical motion, but over only a limited distance. Before modern electromagnetic motors, experimental motors that worked by electrostatic force were investigated. The first electric motors were simple electrostatic devices described in experiments by Scottish monk Andrew Gordon and American experimenter Benjamin Franklin in

1463-488: A world record, which Jacobi improved four years later in September 1838. His second motor was powerful enough to drive a boat with 14 people across a wide river. It was also in 1839/40 that other developers managed to build motors with similar and then higher performance. In 1827–1828, Jedlik built a device using similar principles to those used in his electromagnetic self-rotors that was capable of useful work. He built

1540-592: A wound rotor forming a self-starting induction motor , and the third a true synchronous motor with separately excited DC supply to rotor winding. One of the patents Tesla filed in 1887, however, also described a shorted-winding-rotor induction motor. George Westinghouse , who had already acquired rights from Ferraris (US$ 1,000), promptly bought Tesla's patents (US$ 60,000 plus US$ 2.50 per sold hp, paid until 1897), employed Tesla to develop his motors, and assigned C.F. Scott to help Tesla; however, Tesla left for other pursuits in 1889. The constant speed AC induction motor

1617-584: Is a machine that converts electrical energy into mechanical energy . Most electric motors operate through the interaction between the motor's magnetic field and electric current in a wire winding to generate force in the form of torque applied on the motor's shaft. An electric generator is mechanically identical to an electric motor, but operates in reverse, converting mechanical energy into electrical energy. Electric motors can be powered by direct current (DC) sources, such as from batteries or rectifiers , or by alternating current (AC) sources, such as

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1694-434: Is a self-propelled land vehicle , commonly wheeled , that does not operate on rails (such as trains or trams ), does not fly (such as airplanes or helicopters ), does not float on water (such as boats or ships ), and is used for the transportation of people or cargo . The vehicle propulsion is provided by an engine or motor, usually an internal combustion engine or an electric motor , or some combination of

1771-605: Is composed of 944,000 acres (3,820 km). The elevation ranges from 0 to 11,000 feet (3,400 m); the maximum elevation is at the Beartooth Plateau, located high in the Beartooth Mountains. In a study of reaction of learning how large carnivores would react to the big-game hunting season in Yellowstone National Park , a group of scientists found out that grizzly bear (Ursus arctos) usually stay inside

1848-430: Is the second largest after China (2.21 million by September 2018). As of 2017 , the country's fleet also includes more than 160,000 natural gas vehicles , mainly transit buses and delivery fleets. Despite its relative small size, natural gas use accounted for about 52% of all alternative fuels consumed by alternative transportation fuel vehicles in the U.S. in 2009. The 27 European Union (EU-27) member countries had

1925-471: The South Side Elevated Railroad , where it became popularly known as the " L ". Sprague's motor and related inventions led to an explosion of interest and use in electric motors for industry. The development of electric motors of acceptable efficiency was delayed for several decades by failure to recognize the extreme importance of an air gap between the rotor and stator. Efficient designs have

2002-653: The United States , the country with one of the highest motorization rates in the world, and how it has evolved from 1999 to 2016. In 2017, a total of 97.3 million cars and commercial vehicles were built worldwide, led by China, with about 29 million motor vehicles manufactured, followed by the United States with 11.2 million, and Japan with 9.7 million. The following table shows the top 15 manufacturing countries for 2017 and their corresponding annual production between 2004 and 2017. Electric motor An electric motor

2079-439: The armature . Two or more electrical contacts called brushes made of a soft conductive material like carbon press against the commutator. The brushes make sliding contact with successive commutator segments as the rotator turns, supplying current to the rotor. The windings on the rotor are connected to the commutator segments. The commutator reverses the current direction in the rotor windings with each half turn (180°), so

2156-487: The electrified segment , the fleet of hybrid electric vehicles in the United States is the second largest in the world after Japan, with more than four million units sold through April 2016. Since the introduction of the Tesla Roadster electric car in 2008, cumulative sales of highway legal plug-in electric vehicles in the United States passed one million units in September 2018. The U.S. stock of plug-in vehicles

2233-416: The 1740s. The theoretical principle behind them, Coulomb's law , was discovered but not published, by Henry Cavendish in 1771. This law was discovered independently by Charles-Augustin de Coulomb in 1785, who published it so that it is now known by his name. Due to the difficulty of generating the high voltages they required, electrostatic motors were never used for practical purposes. The invention of

2310-460: The 500 million-unit mark in 1986, from 250 million motor vehicles in 1970. Between 1950 and 1970, the vehicle population doubled roughly every 10 years. Navigant Consulting forecasts that the global stock of light-duty motor vehicles will reach 2 billion units in 2035. Global vehicle ownership in 2010 was 148 vehicles in operation per 1,000 people, a ratio of 1:6.75 vehicles to people, slightly down from 150 vehicles per 1,000 people in 2009,

2387-573: The Lauffen waterfall on the Neckar river. The Lauffen power station included a 240 kW 86 V 40 Hz alternator and a step-up transformer while at the exhibition a step-down transformer fed a 100-hp three-phase induction motor that powered an artificial waterfall, representing the transfer of the original power source. The three-phase induction is now used for the vast majority of commercial applications. Mikhail Dolivo-Dobrovolsky claimed that Tesla's motor

Absaroka–Beartooth Wilderness - Misplaced Pages Continue

2464-405: The United States declined -11.5% in 2017 and -12.8% in 2018. As of 2016 , the stock of alternative fuel vehicles in the United States included over 20 million flex-fuel cars and light trucks , the world's second-largest flexible-fuel fleet in the world after Brazil . However, actual use of ethanol fuel is significantly limited due to the lack of E85 refueling infrastructure. Regarding

2541-657: The Yellowstone National Park and start moving north (into the Absaroka - Beartooth Wilderness) when the hunting starts. At the same region, cougars (Puma concolor) from outside of the Yellowstone National Park tends to go inside when the hunting starts. However, wolves (Canis lupus) don't change their position as they are already spreading in the Yellowstone Nation Park area. During the hunting season, all of them are found to be hunting elk (Cervus elaphus) on

2618-427: The adoption of plug-in electric vehicle . As of 2020 , the stock of light-duty plug-in vehicles in use totaled over 10 million units. As of 2019 , in addition, the medium and heavy commercial segments add another 700,000 units to the global stock of plug-in electric vehicles. In 2020 the global market share of plug-in passenger car sales was 4.2%, up from 2.5% in 2019. Nevertheless, despite government support and

2695-520: The development of DC motors, but all encountered the same battery cost issues. As no electricity distribution system was available at the time, no practical commercial market emerged for these motors. After many other more or less successful attempts with relatively weak rotating and reciprocating apparatus Prussian/Russian Moritz von Jacobi created the first real rotating electric motor in May 1834. It developed remarkable mechanical output power. His motor set

2772-478: The developments by Zénobe Gramme who, in 1871, reinvented Pacinotti's design and adopted some solutions by Werner Siemens . A benefit to DC machines came from the discovery of the reversibility of the electric machine, which was announced by Siemens in 1867 and observed by Pacinotti in 1869. Gramme accidentally demonstrated it on the occasion of the 1873 Vienna World's Fair , when he connected two such DC devices up to 2 km from each other, using one of them as

2849-505: The electric energy produced in the US. In 1824, French physicist François Arago formulated the existence of rotating magnetic fields , termed Arago's rotations , which, by manually turning switches on and off, Walter Baily demonstrated in 1879 as in effect the first primitive induction motor . In the 1880s many inventors were trying to develop workable AC motors because AC's advantages in long-distance high-voltage transmission were offset by

2926-566: The electric grid, provided for electric distribution to trolleys via overhead wires and the trolley pole, and provided control systems for electric operations. This allowed Sprague to use electric motors to invent the first electric trolley system in 1887–88 in Richmond, Virginia , the electric elevator and control system in 1892, and the electric subway with independently powered centrally-controlled cars. The latter were first installed in 1892 in Chicago by

3003-470: The electrochemical battery by Alessandro Volta in 1799 made possible the production of persistent electric currents. Hans Christian Ørsted discovered in 1820 that an electric current creates a magnetic field, which can exert a force on a magnet. It only took a few weeks for André-Marie Ampère to develop the first formulation of the electromagnetic interaction and present the Ampère's force law , that described

3080-518: The end 2016 Vehicle ownership per capita in the U.S. is also the highest in the world, the U.S. Department of Energy (USDoE) reports a motorization rate of 831.9 vehicles in operation per 1000 people in 2016, or a ratio of 1:1.2 vehicles to people. According to USDoE, the rate of motorization peaked in 2007 at 844.5 vehicles per 1,000 people. In terms of licensed drivers , as of 2009 the country had 1.0 vehicle for every licensed driver, and 1.87 vehicles per household. Passenger car registrations in

3157-486: The end of September 2018. The United States has the highest vehicle ownership per capita in the world, with 832 vehicles in operation per 1000 people in 2016. Also, China became the world's largest new car market in 2009. In 2022, a total of 85 million cars and commercial vehicles were built, led by China which built a total of 27 million motor vehicles. In 1968 the Vienna Convention on Road Traffic gave one of

Absaroka–Beartooth Wilderness - Misplaced Pages Continue

3234-453: The engine of a motor vehicle, the most popular options promoted by different governments are: natural gas vehicles , LPG powered vehicles , flex-fuel vehicles , use of biofuels , hybrid electric vehicles , plug-in hybrids , electric cars , and hydrogen fuel cell cars . Since the late 2000s, China, European countries, the United States, Canada, Japan and other developed countries have been providing strong financial incentives to promote

3311-472: The first device to contain the three main components of practical DC motors: the stator , rotor and commutator. The device employed no permanent magnets, as the magnetic fields of both the stationary and revolving components were produced solely by the currents flowing through their windings. The first commutator DC electric motor capable of turning machinery was invented by English scientist William Sturgeon in 1832. Following Sturgeon's work,

3388-499: The first international definitions of a motor vehicle: Other sources might provide other definitions, for instance in the year 1977, ISO 3833:1977 provide other definitions. The U.S. publisher Ward's estimates that as of 2010, there were 1.015 billion motor vehicles in use in the world. This figure represents the number of cars, trucks (light, medium and heavy duty), and buses, but does not include off-road vehicles or heavy construction equipment . The world vehicle population passed

3465-579: The inability to operate motors on AC. The first alternating-current commutatorless induction motor was invented by Galileo Ferraris in 1885. Ferraris was able to improve his first design by producing more advanced setups in 1886. In 1888, the Royal Academy of Science of Turin published Ferraris's research detailing the foundations of motor operation, while concluding at that time that "the apparatus based on that principle could not be of any commercial importance as motor." Possible industrial development

3542-431: The interest of several governments to promote their widespread adoption through public subsidies and other non-financial incentives. Governments have adopted these policies due to a combination of factors, such as environmental concerns , high oil prices, and less dependence on imported oil . Among the fuels other than traditional petroleum fuels ( gasoline or diesel fuel ), and alternative technologies for powering

3619-462: The largest hybrid electric vehicle fleet in the world. As of March 2018 , there were 7.51 million hybrids registered in the country, excluding kei cars , and representing 19.0% of all passenger cars on the road. The Brazilian vehicle fleet reached 64.8 million vehicles in 2010, up from 29.5 million units in 2000, representing a 119% growth in ten years, and reaching a motorization rate of 340 vehicles per 1000 people. In 2010 Brazil experienced

3696-644: The load are exerted beyond the outermost bearing, the load is said to be overhung. The rotor is supported by bearings , which allow the rotor to turn on its axis by transferring the force of axial and radial loads from the shaft to the motor housing. A DC motor is usually supplied through a split ring commutator as described above. AC motors' commutation can be achieved using either a slip ring commutator or external commutation. It can be fixed-speed or variable-speed control type, and can be synchronous or asynchronous. Universal motors can run on either AC or DC. DC motors can be operated at variable speeds by adjusting

3773-538: The magnet, showing that the current gave rise to a close circular magnetic field around the wire. Faraday published the results of his discovery in the Quarterly Journal of Science , and sent copies of his paper along with pocket-sized models of his device to colleagues around the world so they could also witness the phenomenon of electromagnetic rotations. This motor is often demonstrated in physics experiments, substituting brine for (toxic) mercury. Barlow's wheel

3850-480: The north of the Park, where Absaroka-Beartooth Wilderness is. According to the wilderness regulation, group size is limited for 15 people and 15 combined pack and saddle stock. The widespread detection of total coliforms, Bacteroides, and E coli in the water sources of the wilderness area is leading to the question of whether it's because of the increasing human visitation. Visitors of the wilderness are encouraged to purify

3927-485: The point of use, and improving power transmission efficiency. Electric motors applied in agriculture eliminated human and animal muscle power from such tasks as handling grain or pumping water. Household uses (like in washing machines, dishwashers, fans, air conditioners and refrigerators (replacing ice boxes ) of electric motors reduced heavy labor in the home and made higher standards of convenience, comfort and safety possible. Today, electric motors consume more than half of

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4004-477: The production of mechanical force by the interaction of an electric current and a magnetic field. Michael Faraday gave the first demonstration of the effect with a rotary motion on 3 September 1821 in the basement of the Royal Institution . A free-hanging wire was dipped into a pool of mercury, on which a permanent magnet (PM) was placed. When a current was passed through the wire, the wire rotated around

4081-654: The rapid growth experienced, the plug-in electric car segment represented just about 1 out of every 250 vehicles (0.4%) on the world's roads by the end of 2018. The People's Republic of China had 322 million motor vehicles in use at the end of September 2018, of which, 235 million were passenger cars in 2018, making China the country with largest motor vehicle fleet in the world. In 2016, the motor vehicle fleet consisted of 165.6 million cars and 28.4 million trucks and buses. About 13.6 million vehicles were sold in 2009, and motor vehicle registrations in 2010 increased to more than 16.8 million units, representing nearly half

4158-399: The rate of motorization of developed countries . The United States has the second-largest fleet of motor vehicles in the world after China. As of 2016 , had a motor vehicles stock of 259.14 million, of which, 246 million were light duty vehicles, consisting of 112.96 million passenger cars and 133 million light trucks (includes SUVs ). A total of 11.5 million heavy trucks were registered at

4235-428: The rotor and stator ferromagnetic cores have projections called poles that face each other. Wire is wound around each pole below the pole face, which become north or south poles when current flows through the wire. In a nonsalient-pole (distributed field or round-rotor) motor, the ferromagnetic core is a smooth cylinder, with the windings distributed evenly in slots around the circumference. Supplying alternating current in

4312-465: The rotor and the stator. The product between these two fields gives rise to a force and thus a torque on the motor shaft. One or both of these fields changes as the rotor turns. This is done by switching the poles on and off at the right time, or varying the strength of the pole. Motors can be designed to operate on DC current, on AC current, or some types can work on either. AC motors can be either asynchronous or synchronous. Synchronous motors require

4389-402: The rotor, which moves, and the stator, which does not. Electrically, the motor consists of two parts, the field magnets and the armature, one of which is attached to the rotor and the other to the stator. Together they form a magnetic circuit . The magnets create a magnetic field that passes through the armature. These can be electromagnets or permanent magnets . The field magnet is usually on

4466-507: The second highest (after the U.S.) vehicle ownership per capita in 2010, with 690 vehicles per 1000 people. Germany had a rate of motorization of 534 vehicles per 1000 people and the UK of 525 vehicles per 1000 people, both in 2008. France had a rate of 575 vehicles per 1000 people and Spain 608 vehicles per 1000 people in 2007. Portugal, between 1991 and 2002 grew up 220% on its motorization rate, having had in 2002, 560 cars per 1000 people. Italy also leads in alternative fuel vehicles , with

4543-571: The second largest fleet increase in the world after China, with 2.5 million vehicle registrations. As of 2018 , Brazil has the largest alternative fuel vehicle fleet in the world with about 40 million alternative fuel motor vehicles in the road. The clean vehicle stock includes 30.5 million flexible-fuel cars and light utility vehicles and over 6 million flex-fuel motorcycles by March 2018; between 2.4 and 3.0 million neat ethanol vehicles still in use, out of 5.7 million ethanol only light-vehicles produced since 1979; and, as of December 2012 ,

4620-454: The stator and the armature on the rotor, but these may be reversed. The rotor is the moving part that delivers the mechanical power. The rotor typically holds conductors that carry currents, on which the magnetic field of the stator exerts force to turn the shaft. The stator surrounds the rotor, and usually holds field magnets, which are either electromagnets (wire windings around a ferromagnetic iron core) or permanent magnets . These create

4697-435: The stator in plastic resin to prevent corrosion and/or reduce conducted noise. An air gap between the stator and rotor allows it to turn. The width of the gap has a significant effect on the motor's electrical characteristics. It is generally made as small as possible, as a large gap weakens performance. Conversely, gaps that are too small may create friction in addition to noise. The armature consists of wire windings on

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4774-406: The torque applied to the rotor is always in the same direction. Without this reversal, the direction of torque on each rotor winding would reverse with each half turn, stopping the rotor. Commutated motors have been mostly replaced by brushless motors , permanent magnet motors , and induction motors . The motor shaft extends outside of the motor, where it satisfies the load. Because the forces of

4851-500: The total stock. China is also the world's largest electric bus market, reaching about 385,000 units by the end of 2017. The number of cars and motorcycles in China increased 20 times between 2000 and 2010. This explosive growth has allowed China to become the world's largest new car market, overtaking the US in 2009. Nevertheless, ownership per capita is 58 vehicles per 1000 people, or a ratio of 1:17.2 vehicles to people, still well below

4928-732: The two, such as hybrid electric vehicles and plug-in hybrids . For legal purpose, motor vehicles are often identified within a number of vehicle classes including cars , buses , motorcycles , off-road vehicles , light trucks and regular trucks . These classifications vary according to the legal codes of each country. ISO 3833:1977 is the standard for road vehicle types, terms and definitions. Generally, to avoid requiring people with disabilities from having to possess an operator's license to use one, or requiring tags and insurance, powered wheelchairs will be specifically excluded by law from being considered motor vehicles. As of 2011 , there were more than one billion motor vehicles in use in

5005-663: The voltage applied to the terminals or by using pulse-width modulation (PWM). AC motors operated at a fixed speed are generally powered directly from the grid or through motor soft starters . AC motors operated at variable speeds are powered with various power inverter , variable-frequency drive or electronic commutator technologies. The term electronic commutator is usually associated with self-commutated brushless DC motor and switched reluctance motor applications. Electric motors operate on one of three physical principles: magnetism , electrostatics and piezoelectricity . In magnetic motors, magnetic fields are formed in both

5082-429: The water carefully before consumption. The wilderness has imposed some regulations to protect the water source, such as camping and burying human waste within 200 feet (61 m) of lake or stream is prohibited, and waste has to be buried 6 inches (15 cm)-8 inches (20 cm) deep. Motor vehicle A motor vehicle , also known as a motorized vehicle , automotive vehicle , automobile, or road vehicle ,

5159-570: The wilderness include bald eagles, Yellowstone cutthroat trout, threatened grizzly bears, lynx, and the gray wolf. Access to the wilderness is difficult but can be achieved via the Beartooth Highway US 212 from Red Lodge, Montana . There are also some forest access roads from the west off of US 89 south of Livingston, Montana . The wilderness spans the Montana-Wyoming border on Gallatin , Custer and Shoshone National Forests and

5236-436: The wilderness, hundreds of lakes , a few dozen streams, and a similar number of small glaciers can be found in the wilderness. The forests are dominated by various species of spruce , fir , and pine , while in the Beartooth Mountains, due to the altitude, tundra conditions often prevail. The Beartooth has the largest unbroken area of land over 10,000 feet (3,000 m) in altitude in the U.S. outside of Alaska. Animals found in

5313-406: The winding, further increasing the efficiency. In 1886, Frank Julian Sprague invented the first practical DC motor, a non-sparking device that maintained relatively constant speed under variable loads. Other Sprague electric inventions about this time greatly improved grid electric distribution (prior work done while employed by Thomas Edison ), allowed power from electric motors to be returned to

5390-431: The windings creates poles in the core that rotate continuously. A shaded-pole motor has a winding around part of the pole that delays the phase of the magnetic field for that pole. A commutator is a rotary electrical switch that supplies current to the rotor. It periodically reverses the flow of current in the rotor windings as the shaft rotates. It consists of a cylinder composed of multiple metal contact segments on

5467-586: The world's first country where 10% of all passenger cars on the road are plug-in electrics. Also, the Norwegian plug-in car segment market share has been the highest in the world for several years, achieving 39.2% in 2017, 49.1% in 2018, and 74.7% in 2020. Japan had 73.9 million vehicles by 2010, and had the world's second largest motor vehicle fleet until 2009. As of 2016 , the registered motor vehicle fleet totaled 75.81 million vehicles consisting of 61,40 million cars and 14,41 million trucks and buses. Japan has

5544-421: The world's fleet increase in 2010. Ownership per capita rose from 26.6 vehicles per 1000 people in 2006 to 141.2 in 2016. The stock of highway-legal plug-in electric or new energy vehicles in China totaled 2.21 million units by the end of September 2018, of which, 81% are all-electric vehicles . These figures include heavy-duty commercial vehicles such buses and sanitation trucks, which represent about 11% of

5621-404: The world, excluding off-road vehicles and heavy construction equipment . The US publisher Ward's estimates that as of 2019, there were 1.4 billion motor vehicles in use in the world. Global vehicle ownership per capita in 2010 was 148 vehicles in operation (VIO) per 1000 people. China has the largest motor vehicle fleet in the world, with 322 million motor vehicles registered at

5698-508: Was an early refinement to this Faraday demonstration, although these and similar homopolar motors remained unsuited to practical application until late in the century. In 1827, Hungarian physicist Ányos Jedlik started experimenting with electromagnetic coils . After Jedlik solved the technical problems of continuous rotation with the invention of the commutator , he called his early devices "electromagnetic self-rotors". Although they were used only for teaching, in 1828 Jedlik demonstrated

5775-445: Was envisioned by Nikola Tesla , who invented independently his induction motor in 1887 and obtained a patent in May 1888. In the same year, Tesla presented his paper A New System of Alternate Current Motors and Transformers to the AIEE that described three patented two-phase four-stator-pole motor types: one with a four-pole rotor forming a non-self-starting reluctance motor , another with

5852-453: Was found not to be suitable for street cars, but Westinghouse engineers successfully adapted it to power a mining operation in Telluride, Colorado in 1891. Westinghouse achieved its first practical induction motor in 1892 and developed a line of polyphase 60 hertz induction motors in 1893, but these early Westinghouse motors were two-phase motors with wound rotors. B.G. Lamme later developed

5929-438: Was not practical because of two-phase pulsations, which prompted him to persist in his three-phase work. The General Electric Company began developing three-phase induction motors in 1891. By 1896, General Electric and Westinghouse signed a cross-licensing agreement for the bar-winding-rotor design, later called the squirrel-cage rotor . Induction motor improvements flowing from these inventions and innovations were such that

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