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Topic: Polyphase coil


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In the News (Sun 21 Apr 19)

  
  Polyphase Motor/Generator Page
Polyphase brushless permanent magnet motors are becoming more popular for use in modern electric and hybrid/electric vehicles than the magnetless and single-phase varieties because they are easier to start, easier to control, easier to drive, and tend to have greater power densities.
The coil leads are passed through their adjacent feed through holes in the armature frame and connected to the phase lead screw connector platforms by soldering them to tabs on the underside of the screw platforms.
Whether a coil is being energized by the north pole or the south pole of a magnet determines the polarity of the current produced in the coil.
www.stanford.edu /~hydrobay/lookat/pmg.html   (16676 words)

  
 Polyphase coil - Wikipedia, the free encyclopedia
Polyphase coils are electrical coils (phases) connected together in a polyphase system such as a generator or motor.
Compared to single-phase motors and generators, polyphase coils are simpler, because they do not require external circuitry (using capacitors and inductors) to produce a starting torque.
Like all coils used in electrical machinery, polyphase coils (made from insulated conducting wire) are wound around ferromagnetic armatures with radial projections and maximum core-surface exposure to the magnetic field.
en.wikipedia.org /wiki/Polyphase_coil   (211 words)

  
 Polyphase system - Wikipedia, the free encyclopedia
Polyphase electrical systems supply alternating current electrical power in overlapping phases.
The voltage on each phase is a sine wave, with a fixed time offset, or phase shift, between the phases.
Polyphase power is particularly useful in AC motors, such as the induction motor, where it generates a rotating magnetic field.
en.wikipedia.org /wiki/Polyphase_system   (520 words)

  
 Polyphase coil -- Facts, Info, and Encyclopedia article   (Site not responding. Last check: 2007-11-05)
Polyphase coils are electrical coils (phases) connected together in a (Click link for more info and facts about polyphase system) polyphase system such as a (Engine that converts mechanical energy into electrical energy by electromagnetic induction) generator or (Machine that converts other forms of energy into mechanical energy and so imparts motion) motor.
Like all coils used in electrical machinery, polyphase coils (made from insulated conducting (Ligament made of metal and used to fasten things or make cages or fences etc) wire) are wound around (Click link for more info and facts about ferromagnetic) ferromagnetic armatures with radial projections and maximum core-surface exposure to the magnetic field.
The use of polyphase coils in electrical power systems was pioneered by the engineer (United States electrical engineer and inventor (born in Croatia but of Serbian descent) who discovered the principles of alternating currents and developed the first alternating-current induction motor and the Tesla coil and several forms of oscillators () Nikola Tesla.
www.absoluteastronomy.com /encyclopedia/P/Po/Polyphase_coil.htm   (345 words)

  
 Polyphase coil   (Site not responding. Last check: 2007-11-05)
Polyphase coils are made up of three phases of energy (induction, neutralization, and capacitance).
Poly phase coil element s can be arranged to form LCR circuit s with the ability of induction, neutralization, and capacitance simultaneously.
Coils (or insulated conducting wire) may be wound or formed to have polar projections and maximum core-surface exposure to the field magnetic.
www.serebella.com /encyclopedia/article-Polyphase_coil.html   (398 words)

  
 polyphase system   (Site not responding. Last check: 2007-11-05)
Polyphase power is particularly useful in AC motors, where it can be used to generate a rotating magnetic field.
In a polyphase system several such supplies are overlapped out of phase to smooth out the total voltage.
Polyphase electrical systems operate on the principle of a alternate-current circuits' rotating magnetic field lead-lag effect.
www.yourencyclopedia.net /Polyphase_system.html   (318 words)

  
 Learn more about Nikola Tesla in the online encyclopedia.   (Site not responding. Last check: 2007-11-05)
Tesla's most famous contribution was the theory of polyphase alternating current electricity, which he used to build the first induction motor, invented in 1882, as well as developing the designs of numerous other electrical machines and related technology.
Tesla is also noted for inventing the Tesla coil and a bladeless turbine (which functions on the principles of fluid viscosity and the boundary layer effect).
The exhibits included a switchboard, polyphase generators, step-up and step-down transformers, transmission line, commercial size induction motors, commercial size synchronous motors, and rotary direct current converters (one of which was operating a railway motor).
www.onlineencyclopedia.org /n/ni/nikola_tesla.html   (5775 words)

  
 Stator for rotary machine and method of manufacturing the stator - US Patent 6664703   (Site not responding. Last check: 2007-11-05)
The rotor 7 comprises a rotor coil 13 for producing a magnetic flux by passing a current, and a pair of pole cores 20, 21, provided to cover the rotor coil 13, for forming the magnetic poles due to the magnetic flux produced by the rotor coil 13.
And since the insulation between the stator iron core 15 and the stator coil 16 is made by the insulating paper 19, when the teeth 15c is deformed, the insulating paper 19 is ruptured, resulting in a problem of causing a short-circuit with the stator coil 16.
Thereby, the stator coil 16 is less damaged near the opening edge of the slot 15a, and the insulating resin 100 is less exfoliated, to prevent the insulating film from being damaged, and improve the insulating ability.
www.patentstorm.us /patents/6664703.html   (5368 words)

  
 Patent 5455885: Method and apparatus for starting a sensorless polyphase DC motor in dual-coil mode and switching to ...
Additionally, a predetermined first delay may be established between a zero crossing of a bemf signal of a floating coil and a commutation of driving signals to the coils in the dual-coil mode and a second predetermined delay established in uni-coil mode.
The currents that flow in the coil 11 are designated by the legends i.sub.A- and i.sub.+, referring to current flowing respectively from the center tap connection 15 to the terminal A, and from the terminal A to the center tap connection 15 through the coil 11.
The state of the "pnslope" signal represents the anticipated slope of the bemf signal of the floating coil to be detected for commutation of the sequencer 81.
www.freepatentsonline.com /5455885.html   (7639 words)

  
 Patent 5481167: Amplifier and method for detecting the bemf of a coil of a polyphase sensorless DC motor
The circuit of claim 6 wherein said motor coil is one of a plurality of motor field coils connected in a "Y" configuration, and said reference potential connected to said current control element of said second current path is produced at a center tap connection of said plurality of motor field coils.
The motor coil may be one of a plurality of motor field coils connected in a "Y" configuration, and the reference potential is produced at a center tap connection of the plurality of motor field coils.
In accordance with the method, a voltage proportional to a voltage on the motor coil with response to a reference potential, and a voltage proportional to the reference potential, of same proportional ratio as the voltage proportional to a voltage on the motor coil are generated.
www.freepatentsonline.com /5481167.html   (6128 words)

  
 Polyphase coil   (Site not responding. Last check: 2007-11-05)
Polyphase coils are made up of three phases of energy (induction, neutralization, and capacitance).Each phase consists of 90 degrees in phase, and three, 30 degrees out of phase.
Poly phase coil elements can be arranged to form LCR circuits with the ability of induction, neutralization, and capacitance simultaneously.
Coils (or insulated conducting wire) may be wound or formed tohave polar projections and maximum core-surface exposure to the field magnetic.
www.therfcc.org /polyphase-coil-272656.html   (130 words)

  
 Alternating current generator for vehicle - US Patent 6369474   (Site not responding. Last check: 2007-11-05)
2, numeral 1 is a front bracket, and numeral 2 is a rear bracket, and numeral 3 is a stator sandwiched between the front bracket 1 and the rear bracket 2 and the stator comprises a stator core 4 and a stator coil 5.
During use of the generator, bending stress is repeatedly applied to the lead conductor 19 of the stator coil 5 due to vibration transmitted from an engine, and a portion to which the strongest bending stress is applied is the boundary where the lead conductor 19 is bonded and fixed to the metal terminal 20.
The case of a stator coil 5 with star connection is shown in the first and second embodiments, but in this embodiment, an example of delta connection is shown and two lead conductors 19a and 19d are connected to a metal terminal 20.
www.patentstorm.us /patents/6369474.html   (2132 words)

  
 Polyphase system   (Site not responding. Last check: 2007-11-05)
Alternate current sine wave voltage points the field is graphed and analyzed show result of a magnetic field that is (thus producing the alternating polarity).
In a polyphase several such supplies are overlapped out of to smooth out the total voltage.
Polyphase electrical operate on the principle of a alternate-current rotating magnetic field lead-lag effect.
www.freeglossary.com /Polyphase_system   (465 words)

  
 Low-power, gaussian, polyphase filter for mobile transceivers
A polyphase filter is an example of a selective filter without the need of using high Q bandpass sections.
Polyphase filters can discriminate between positive and negative frequencies and therefore, using this property, selectivity can be achieved [15].
The polyphase bandpass filter ensures the rejection of the mirror frequency and provides the antialiasing necessary in the digital signal processor (DSP) which does the final downconversion to baseband and demodulation of the signal.
www.edacafe.com /books/phdThesis/Chapter-4.5.php   (2110 words)

  
 Nikola Tesla   (Site not responding. Last check: 2007-11-05)
Tesla's most famous contribution was the theory of polyphase alternating current electricity, which he used to build the first induction motor in 1882, as well as developing the designs of numerous other electrical machines and related technology.
A wireless transmitter, as described in the technical patent US1119732 (the Tesla coil), projected electrical energy (not necessarily destructive) in any amount to any distance and could be applied for innumerable purposes, both in peace and war.
A system for "Projecting Concentrated Non-Dispersive Energy Through Natural Media" known as teleforce was reportedly developed later in his life [commonly known as a "death ray" or "peace ray"] (primarily a defensive weapon, with characteristics of a weapon of offense).
www.sciencedaily.com /encyclopedia/nikola_tesla   (6506 words)

  
 Polyphase system   (Site not responding. Last check: 2007-11-05)
Polyphase electrical systems supply alternating current electrical power inoverlapping phases.
Polyphase power is particularly useful in AC motors, whereit can be used to generate a rotating magnetic field.
Polyphase electrical systems operate on the principle of a alternate-current circuits' rotating magneticfield lead-lag effect.
www.therfcc.org /polyphase-system-70349.html   (259 words)

  
 Encyclopedia: Polyphase system
Two-phase electrical power was used in some early 20th century factories and the distribution systems that served them.
Visualization of the rotating magnetic field led Nikola Tesla to invent the first practical induction motors - previously all commercial motors were DC, with expensive commutators, high-maintenance brushes, and characteristics unsuitable for operation on an alternating current network.
An alternating current (AC) is an electrical current where the magnitude and direction of the current varies cyclically, as opposed to direct current, where the direction of the current stays constant.
www.nationmaster.com /encyclopedia/Polyphase-system   (1006 words)

  
 Evaporator Coil   (Site not responding. Last check: 2007-11-05)
1) " Evaporator" -- In re: Evaporator Coil
2) " Coil" -- In re: Evaporator Coil
In electrical engineering, a coil is formedwhen a metal wire is coiled around a core to create an electronic inductor or electromagnet.
www.witchware.com /File/5764-Evaporator.Coil.Html   (463 words)

  
 Encyclopedia: Polyphase coil
Various types of capacitors A capacitor is a device that stores energy in the electric field created between a pair of conductors on which equal but opposite electric charges have been placed.
An inductor is a passive electrical device that stores energy in a magnetic field, typically by combining the effects of many loops of electric current.
Ferromagnetism is a phenomenon by which a material can exhibit a spontaneous magnetization, and is one of the strongest forms of magnetism.
www.nationmaster.com /encyclopedia/Polyphase-coil   (471 words)

  
 Altair - Nikola Tesla and How to Make a Tesla Coil
The Tesla Coil was delightfully awe inspiring, with its shattering roar and streamers of purple fire writhing in the air.
In high power Tesla coils, the RF energy in the primary may cause the gap to continue conducting RF after the capacitor is discharged, which depletes the energy from the primary-secondary system.
Primary coils spirally wound in the shape of an inverted cone allow the coupling to be adjusted by raising or lowering the secondary.
www.altair.org /tesla.html   (2261 words)

  
 Dictionary of Meaning www.mauspfeil.net
'''Polyphase coils''' are electrical coils (phases) connected together in a polyphase system such as a electrical generator generator or electric motor motor.
Like all coils used in electrical machinery, polyphase coils (made from insulated conducting wire) are wound around ferromagnetism ferromagnetic armatures with radial projections and maximum core-surface exposure to the magnetic field.
There you find a list of all editors and the possibility to edit the original text of the article Polyphase coil.
www.mauspfeil.net /Polyphase_coil.html   (249 words)

  
 An Experimental Polyphase Receiver by Bozidar Pasaric 9A2HL, Croatia
The electric diagram of that polyphase network is shown in fig.
Since IC2 binary counter (74ACT163) does not have an up/down pin, the USB/LSB switching must be done at the polyphase network by switching the input wires between pins 2 and 3 of the PPN - with a DPDT switch S-1.
The coil is a small no-name toroid with 20 turns of insulated wire in the primary (or as many turns as necessary), and 2 turns in the secondary.
www.hanssummers.com /electronics/gallery/4   (1790 words)

  
 Polyphase coil.html - Wikipedia, the free encyclopedia
Look for Polyphase coil.html in Wiktionary, our sister dictionary project.
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www.wikipedia.org /wiki/Polyphase_coil.html   (103 words)

  
 Tesla's 'Egg Of Columbus'   (Site not responding. Last check: 2007-11-05)
I've attached a photograph of the famed "Egg of Columbus" -- a rotating field experiment that was on exhibit at the World's Fair in 1893.
The Egg was created by Nikola Telsa and consisted of a complex polyphase field-coil located directly under a plate with a copper-plated egg positioned on top of it.
When power was applied in sequence to the coils, the complex magnetic field arrangement not only inductively created a high-spin on the egg, it also made it stand up on end -- appearing to resist gravity.
www.rense.com /general26/tes.htm   (89 words)

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