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64-620: SM U-5 or U-V was the lead boat of the U-5 class of submarines or U-boats built for and operated by the Austro-Hungarian Navy ( German : Kaiserliche und Königliche Kriegsmarine, K.u.K. Kriegsmarine ) before and during the First World War . The submarine was built as part of a plan to evaluate foreign submarine designs, and was the first of three boats of the class built by Whitehead & Co. of Fiume after

128-399: 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

192-430: 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

256-432: A mine . The boat sank at a depth of 36 meters (118 ft) with a loss of 6 of the 19 men on board. From 20 to 24 May the submarine was raised, and through November underwent a refit. During this reconditioning, a new conning tower was added and the deck gun was upgraded again, this time to a 7.5 cm/30 (3.0 in) gun. Upon completion, U-5 was recommissioned, but had no more war successes. In her career, U-5 sank

320-510: A single-hull with a teardrop-shaped body that bore a strong resemblance to modern nuclear submarines. She was 105 feet 4 inches (32.11 m) long by 13 feet 9 inches (4.19 m) abeam and had a draft of 12 feet 10 inches (3.91 m). She displaced 240 metric tons (260 short tons) surfaced, and 273 metric tons (301 short tons) submerged. Her two 45-centimeter (17.7 in) bow torpedo tubes featured unique, cloverleaf-shaped design hatches that rotated on

384-466: A war reparation , and scrapped in 1920. In all, U-5 sank three ships totaling 7,929  gross register tons  (GRT) and 12,641 tons. U-5 was built as part of a plan by the Austro-Hungarian Navy to competitively evaluate foreign submarine designs from Simon Lake , Germaniawerft , and John Philip Holland . The Austro-Hungarian Navy authorized the construction of U-5 (and sister ship, U-6 ) in 1906 by Whitehead & Co. of Fiume . The boat

448-404: 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:

512-431: 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

576-558: A central axis, and the boat was designed to carry up to four torpedoes . For surface running, U-5 was outfitted with 2 gasoline engines , but suffered from inadequate ventilation, which resulted in frequent intoxication of the crew; her underwater propulsion was by two electric motors . The U-5 was christened by Agathe Whitehead on 10 February 1909. U-5 was commissioned into the Austro-Hungarian Navy on 1 April 1910, with Linienschiffsleutnant Urban Passerar in command. Over

640-470: 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

704-463: 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

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768-521: A design by Irishman John Philip Holland . U-5 was laid down in April 1907 and launched in February 1909. The double- hulled submarine was just over 105 feet (32 m) long and displaced between 240 and 273 metric tons (265 and 301 short tons), depending on whether surfaced or submerged. U-5 ' s design had inadequate ventilation and exhaust from her twin gasoline engines often intoxicated

832-422: 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

896-437: 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

960-1037: 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

1024-425: 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

1088-398: 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

1152-833: A theme by which vessels in the class are named, as in the Royal Navy 's Tribal-class frigates , named after tribes of the world, such as HMS  Mohawk . If a ship class is produced for another navy, the first active unit will become the lead ship for that navy; for example, the Oliver Hazard Perry -class frigates are known as the Adelaide class in Royal Australian Navy service. Electric motor Electric motors can be powered by direct current (DC) sources, such as from batteries or rectifiers , or by alternating current (AC) sources, such as

1216-415: A total of three ships totaling 7,929  GRT and 12,641 tons. After the war's end, U-5 was transferred to Venice where she was inspected by British military commissions. U-5 was later ceded to Italy as a war reparation in 1920 and was scrapped. Lead ship The lead ship , name ship , or class leader is the first of a series or class of ships that are all constructed according to

1280-584: 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

1344-493: 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

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1408-592: 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

1472-483: 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

1536-439: 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

1600-416: 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

1664-535: The Austro-Hungarian Navy fleet. She was initially stationed at the submarine base on Brioni , but was moved to Cattaro by late 1914. U-5 made an unsuccessful attack on a French battleship squadron off Punta Stilo on 3 November. In December, the ship's armament was augmented by a 3.7 cm/23 (1.5 in) quick-firing (QF) deck gun , and had her first radio receiver installed. In April 1915, Georg Ritter von Trapp assumed command of U-5 , and

1728-582: 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

1792-486: The crew. The boat was commissioned into the Austro-Hungarian Navy in April 1910, and served as a training boat—sometimes making as many as ten cruises a month—through the beginning of the First World War in 1914. The submarine scored most of her wartime successes during the first year of the war while under the command of Georg Ritter von Trapp . The French armoured cruiser Léon Gambetta , sunk in April 1915,

1856-523: 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

1920-478: 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

1984-508: 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

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2048-576: 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

2112-474: 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

2176-481: The end of August, U-5 captured the 1,034  GRT Greek steamer Cefalonia as a prize off Durazzo . In late November, Friedrich Schlosser succeeded von Trapp as U-5 ' s commanding officer. Schlosser and U-5 made an unsuccessful attack on an Italian Indomito -class destroyer on 7 June 1916, but the boat managed to torpedo the Italian armed merchant cruiser Principe Umberto off Cape Linguetta on

2240-581: The entire complement of officers, including Rear Admiral Victor Baptistin Sénès . Of the French ship's complement, 648 were killed in the attack; there were 137 survivors. Léon Gambetta was the largest ship of any kind sunk by U-5 . In June, U-5 helped search for the lost Austro-Hungarian seaplane L 41 , and in July, received an upgrade of her deck gun to a 4.7 cm (1.9 in) QF gun. In early August, U-5

2304-472: 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,

2368-465: The first one is completed, launched and tested. Nevertheless, building copies is still more efficient and cost effective than building prototypes , and the lead ship will usually be followed by copies with some improvements rather than radically different versions. The improvements will sometimes be retrofitted to the lead ship. Occasionally, the lead ship will be launched and commissioned for shakedown testing before following ships are completed, making

2432-521: The following month, led the boat in sinking the French armored cruiser Léon Gambetta off Santa Maria di Leuca . On the night of 26 April, Léon Gambetta was patrolling the Straits of Otranto at a leisurely 6.5 knots (12.0 km/h) without the benefit of a destroyer screen. U-5 launched two torpedoes at the French cruiser, hitting with both. The ship was rocked by the explosions of the two torpedoes and went down in ten minutes, taking down with her

2496-586: 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

2560-514: The lead ship a combination of template and prototype, rather than expending resources on a prototype that will never see actual use. Ship classes are typically named in one of two ways; echoing the name of the lead ship, such as the Pennsylvania -class battleships , whose lead ship was USS  Pennsylvania , and the Olympic class , whose lead ship was RMS  Olympic , or defining

2624-457: The lines and maneuvered to get a shot at von Trapp's boat. Nereide launched a single torpedo at U-5 that missed, after which del Greco ordered his boat submerged. U-5 lined up a shot and launched a single torpedo at the slowly submerging target, striking her, and sending her to the bottom with all hands. The Italian captain received the Medaglia d'Oro al Valore Militare for his actions. At

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2688-644: 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

2752-546: 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

2816-475: The next day. According to a contemporary account, Principe Umberto and two other ships were transporting troops and materiel under escort of two destroyers. After the torpedo hit, Principe Umberto went down quickly with the loss 1,750 men. Principe Umberto was the last ship hit by U-5 . On 16 May 1917, U-5 was conducting a training cruise in the Fasana Channel near Pula when her stern struck

2880-402: The next three years she served primarily as a training boat, making as many as ten training cruises per month. On 1 May 1911, she hosted a delegation of Peruvian Navy officers that inspected her. In June 1912, she towed a balloon as part of efforts to assess the underwater visibility of hull paint schemes. At the outbreak of World War I , U-5 was one of only four fully operational U-boats in

2944-485: 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

3008-485: 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

3072-428: 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

3136-465: 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

3200-402: 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

3264-440: The same general design . The term is applicable to naval ships and large civilian vessels. Large ships are very complex and may take five to ten years to build. Improvements based on experience with building and operating the lead ship are likely to be incorporated into the design or construction of later ships in the class, so it is rare to have vessels that are identical. The second and later ships are often started before

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3328-454: 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

3392-435: 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

3456-406: 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

3520-663: 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

3584-406: 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

3648-431: 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

3712-508: 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

3776-554: Was designed by American John Philip Holland and licensed by Holland and his company, Electric Boat . U-5 was laid down on 9 April 1907 in the United States, partially assembled, and shipped to Whitehead's for final assembly, a process which, author Edwin Sieche notes, "caused a lot of trouble". She was launched at Fiume on 10 February 1909 by Agathe Whitehead, and towed to Pola on 17 August. U-5 ' s design featured

3840-449: 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

3904-458: 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

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3968-438: 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

4032-467: Was sent out from Lissa when the Austro-Hungarian Navy received word from a reconnaissance aircraft that an Italian submarine had been sighted at Pelagosa . On the morning of 5 August, the Italian submarine  Nereide was on the surface, moored under a cliff in the island's harbor. When U-5 surfaced just offshore, Nereide ' s commanding officer, Capitano di Corvetta Carlo del Greco, cast off

4096-461: Was the largest ship sunk by U-5 . The sinking of Italian troop transport ship SS  Principe Umberto in June 1916 with the loss of 1,926 men, was the worst naval disaster of World War I in terms of human lives lost. In May 1917, U-5 hit a mine and sank with the loss of six men. She was raised, rebuilt, and recommissioned, but sank no more ships. At the end of the war, U-5 was ceded to Italy as

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