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Steinmetz Equivalent Circuit
An induction motor or asynchronous motor is an AC electric motor in which the electric current in the rotor that produces torque 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 a variable load. History In 1824 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Garbage Disposals
A garbage disposal unit (also known as a waste disposal unit, food waste disposer (FWD), in-sink macerator, garbage disposer, or garburator) is a device, usually electrically powered, installed under a kitchen sink between the sink's drain and the trap. The device shreds food waste into pieces small enough—generally less than in diameter—to pass through plumbing. History The garbage disposal unit was invented in 1927 by John W. Hammes, an architect working in Racine, Wisconsin. He applied for a patent in 1933 that was issued in 1935. His InSinkErator company put his disposer on the market in 1940. Hammes' claim is disputed, as General Electric introduced a garbage disposal unit in 1935, known as the Disposall. In many cities in the United States in the 1930s and the 1940s, the municipal sewage system had regulations prohibiting placing food waste (garbage) into the system. InSinkErator spent considerable effort, and was highly successful in convincing many localit ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Electricity Meter
file:Hydro quebec meter.JPG, North American domestic analog signal, analog (Galileo Ferraris, Ferraris disk) electricity meter. file:Transparent Electricity Meter found in Israel.JPG, Electricity meter with transparent plastic case (Israel) file:West Bengal State Electricity Distribution Company Limited electricity meter – Purulia, West Bengal, India.jpg, Electricity meter in West Bengal, IndiaAn electricity meter, electric meter, electrical meter, energy meter, or kilowatt-hour meter is a device that measures the amount of electric energy consumed by a House, residence, a business, or an electrically powered device over a time interval. Electric utility, Electric utilities use electric meters installed at customers' premises for electricity pricing, billing and monitoring purposes. They are typically calibrated in billing units, the most common one being the kilowatt hour (''kWh''). They are usually read once each billing period. When energy savings during certain periods ar ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ottó Bláthy
Ottó Titusz Bláthy (11 August 1860 – 26 September 1939) was a Hungarian electrical engineer. During his career he became the co-inventor of the modern electric transformer, the voltage regulator, the AC watt-hour meter, the turbo generator, the high-efficiency turbo generator and the motor capacitor for the single-phase (AC) electric motor. Bláthy's career as an inventor began during his time at the Ganz Works in 1883. There, he conducted experiments for creating a transformer. The name "transformer" was created by Bláthy. In 1885 the ''ZBD'' model alternating-current transformer was invented by three Hungarian engineers: Ottó Bláthy, Miksa Déri and Károly Zipernowsky. (''ZBD'' comes from the initials of their names). In the autumn of 1889 he patented the AC watt-meter. Student paper read on 24 January 1896 at the Students' Meeting. Early life He attended schools in Tata and Vienna, where he obtained diploma of machinery in 1882. Between 1881 and 1883 he ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hungary
Hungary is a landlocked country in Central Europe. Spanning much of the Pannonian Basin, Carpathian Basin, it is bordered by Slovakia to the north, Ukraine to the northeast, Romania to the east and southeast, Serbia to the south, Croatia and Slovenia to the southwest, and Austria to the west. Hungary lies within the drainage basin of the Danube, Danube River and is dominated by great lowland plains. It has a population of 9.6 million, consisting mostly of ethnic Hungarians, Hungarians (Magyars) and a significant Romani people in Hungary, Romani minority. Hungarian language, Hungarian is the Languages of Hungary, official language, and among Languages of Europe, the few in Europe outside the Indo-European languages, Indo-European family. Budapest is the country's capital and List of cities and towns of Hungary, largest city, and the dominant cultural and economic centre. Prior to the foundation of the Hungarian state, various peoples settled in the territory of present-day Hun ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Commutator (electric)
A commutator is a rotary switch, electrical switch in certain types of electric motors and electrical generators that periodically reverses the Current (electricity), current direction between the rotor and the external circuit. It consists of a cylinder composed of multiple metal contact segments on the rotating armature (electrical engineering), armature of the machine. Two or more electrical contacts called "brush (electric), brushes" made of a soft conductive material like carbon press against the commutator, making sliding contact with successive segments of the commutator as it rotates. The windings (coils of wire) on the armature (electrical engineering), armature are connected to the commutator segments. Commutators are used in direct current (DC) machines: dynamos (DC generators) and many DC motors as well as universal motors. In a motor the commutator applies electric current to the windings. By reversing the current direction in the rotating windings each half turn, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Silvanus Phillips Thompson
Silvanus Phillips Thompson (19 June 1851 – 12 June 1916) was an English professor of physics at the City and Guilds Technical College in Finsbury, England. He was elected to the Royal Society in 1891 and was known for his work as an electrical engineer and as an author. Thompson's most enduring publication is his 1910 text '' Calculus Made Easy'', which teaches the fundamentals of infinitesimal calculus, and is still in print. Thompson also wrote a popular physics text, ''Elementary Lessons in Electricity and Magnetism,'' as well as biographies of Lord Kelvin and Michael Faraday. Biography Thompson was born on 19 June 1851 to a Quaker family in York, England. His father served as a master at the Quaker Bootham School in York and he also studied there. In 1873 Silvanus Thompson was made the science master at the school. He graduated and sat for Bachelor of Arts University of London external degree in 1869. After a teaching apprenticeship he was awarded a scholarship to the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Walter Baily's Motor
Walter Bailys Polyphase motor (1879) marks the beginning of the development of modern polyphase motor, polyphase motors. Mr. Bailey exhibited his invention on the Physical Society of London on June 28, 1879, on the occasion of his reading a paper entitled, "A Mode of Producing Arago's Rotations." Description Before Baily's invention, the only mode of producing the Arago's rotations, Arago-rotations of a copper disk had been by rotating beneath it a steel magnet. Baily, instead of rotating any material magnet below the disk used a fixed electromagnet, but caused its magnetism to shift progressively between four successive poles, thus producing in the copper disk pivoted above the Eddy current, eddy-currents, which by their reaction gave the disk a mechanical motion in the direction of the progression of the poles. The disk in this primitive model is about inches in diameter; the four magnet cores are about 4 inches high, joined to a common yoke; and each is wound with about 150 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rotating Magnetic Field
A rotating magnetic field (RMF) is the resultant magnetic field produced by a system of Electromagnetic coil, coils symmetrically placed and supplied with Polyphase system, polyphase currents. A rotating magnetic field can be produced by a poly-phase (two or more phases) current or by a single phase current provided that, in the latter case, two field windings are supplied and are so designed that the two resulting magnetic fields generated thereby are out of phase. Rotating magnetic fields are often utilized for Electromechanics, electromechanical applications, such as induction motors, electric generators and induction regulators. History In 1824, the French physicist François Arago formulated the existence of rotating magnetic fields using a rotating copper disk and a needle, termed “Arago's rotations.” English experimenters Charles Babbage and John Herschel found they could induce rotation in Arago's copper disk by spinning a horseshoe magnet under it, with English scienti ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
François Arago
Dominique François Jean Arago (), known simply as François Arago (; Catalan: , ; 26 February 17862 October 1853), was a French mathematician, physicist, astronomer, freemason, supporter of the Carbonari revolutionaries and politician. Early life and work Arago was born at Estagel, a small village of 3,000 near Perpignan, in the ' of Pyrénées-Orientales, France, where his father held the position of Treasurer of the Mint. His parents were François Bonaventure Arago (1754–1814) and Marie Arago (1755–1845). Arago was the eldest of four brothers. Jean (1788–1836) emigrated to North America and became a general in the Mexican army. Jacques Arago, Jacques Étienne Victor (1799–1855) took part in Louis de Freycinet's exploring voyage in the ''Uranie'' from 1817 to 1821, and on his return to France devoted himself to his journalism and the drama. The fourth brother, Étienne Arago, Étienne Vincent (1802–1892), is said to have collaborated with Honoré de Balzac in ''The ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Squirrel Cage
Squirrel-cage may refer to: *a squirrel-cage rotor *a squirrel-cage fan, another name for a centrifugal fan *a hamster wheel A hamster wheel or running wheel is an exercise device used primarily by hamsters and other rodents, but also by other Cursorial, cursorial animals when given the opportunity. Most of these devices consist of a runged or ridged wheel held on a ... *"Squirrel Cage", a short story by Robert Sheckley *"The Squirrel Cage", a short story by Thomas M. Disch {{disambig ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
