Stator (electric) - Factbites

Stator (electric) - Factbites
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Topic: Stator (electric)

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In the News (Thu 31 Dec 09)

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	HV Generators repaired / rewounded by Edison Electrical Works, India, Repairers rewinders of High voltage equipments.
		Repair of Stator Winding of Canadian General Electric (Canada) make, 11 KV, 130 MW, 375 RPM Hydro Generator of Idukki Power House, Moolamattom.
		Repair of Stator Winding of English Electric (UK) make, 11 KV, 8 MW, 600 RPM Hydro Generator of Poringal Kuthu Power House.
		Complete F class Rewinding of 144 slot Stator Winding and H class reinsulation of Rotor and Uprating from 8 MW to 9.6 MW of English Electric (UK) make, 11 KV, 8 MW, 600 RPM Hydro Generator of Unit 1 of Poringal Kuthu Power House.
	www.edison-india.com /generators.htm

	The ELECTRIC MOTOR: Here and Now
		In most cases, regardless of type, electric motors consist of a stator (stationary field) and a rotor (the rotating field or armature) and operate through the interaction of magnetic flux and electric current to produce rotational speed and torque.
		In this motor, when the stator magnetic field rotates and the rotor windings are shorted, the stator magnetic field motion induces a field into the wound-rotor, once again causing the rotor to turn at nearly the speed of the rotating stator magnetic field.
		A third type, the shunt-connected motor in which the armature and field windings have the same DC source, is not widely used because of the lack of speed control capabilities imposed by the winding connection.
	www.freescale.com /webapp/sps/site/overview.jsp?nodeId=02nQXG3MYxCKS2JjTF (1821 words)

	ELECTRIC MOTOR SERVICE CENTER Inc. Electric Motor Principles
		When the stator in an electric motor is energized with AC power, the poles of the stator reverse and change polarity (direction of north and south).
		Efficiency is the ratio of mechanical output to electrical input.
		This change of polarity develops a rotating magnetic field in the stator, called the synchronous speed.
	home.comcast.net /~sagnetworks/motors.htm (1821 words)

	Stator core fault detection, digital EL CID instrument - Adwel International
		It is an improved version of the original analog EL CID, the technique has been recognized since the 1970's as the leading method of detecting insulation breakdown between the stator core laminations in electric generators and large electric motors.
		Having the capability to follow automatically the edge of stator teeth, the RIV carries the sensing head of the EL CID, thereby significantly reducing operator fatigue.
		EL CID tests the core iron of stators safely, quickly and accurately using unnecessary low power and obtains a permanent record for analysis and trending.
	www.adwel.com /elcid.html (1821 words)

	Maintenacne World: Maintenance and Troubleshooting of Electric Motors
		Electrical unbalance usually indicates an electrical failure such as an open stator or rotor winding, an open bar or ring in squirrel cage motors or shorted field coils in synchronous motors.
		Electrical unbalance occurs when the magnetic attraction between stator and rotor is uneven around the periphery of the motor.
		Various electrical failures in the motor windings or connections manifest themselves in sparking and poor commutation.
	www.maintenanceworld.com /Articles/relianceelectric/maintenance-troubleshooting-electric-motors.htm (3393 words)

	Electric Traction Technology
		Some electric trains do have energy-storage capacity, for instance the class 74 had a built-in dynamo which was spun up in third-rail sections and then used to drive a generator when the train has to move through short non-electricified sections, such as when faced with complex junction layouts where electrification is impractical.
		Pass an electric current through a piece of wire in a magnetic field, it experiences a force which is at right angles to both the field and the current.
		Electricity flows from terminal A to terminal B half the time, and from terminal B back to terminal A the other half ~ i.e.
	www.lexcie.zetnet.co.uk /traction.htm (3393 words)

	Hysteresis motors (from electric motor) -- Encyclopædia Britannica
		power source that provides electric traction in a straight line, in contrast to rotary action of most motors; used in high-speed ground transportation, especially rail vehicles; stationary conductor (or third rail) fastened to road bed for power, which is carried to double stator fastened to vehicle to propel in linear direction.
		In one form designed for rail vehicles, a continuous stationary conductor is fastened to the roadbed and a double stator is suspended between the wheels in the centre of the vehicle, straddling...
		In special situations, the electric supply may come from a battery, as, for example, in an automobile.
	www.britannica.com /eb/article?tocId=45837 (3393 words)

	Innovations:
		The power and efficiency of electric motors can be increased if there are sources of magnetic flux both on the stator and on the rotor.
		Although the prototype electric motors incorporating copper-based HTS materials are not yet suitable for commercial applications, the performance benefits that can result from the use of these materials has been satisfactorily demonstrated.
		HTS materials are especially beneficial for this type of motor because they are intrinsically hysteretic, implying that the magnetic flux cannot move freely throughout the material causing the magnetization and stator fields to be misaligned and, thereby, resulting in a large alignment torque.
	www.copper.org /innovations/2000/06/electric-motors-cuprate-supercondutors.htm (3393 words)

	Electric motors & motor controls engineering - hysteresis motor
		The torque of the rotor acts in direction of positive theta, tending to align the magnetic axis of the distributed rotor flux density with the magnetomotive force axis of the stator.
		"The hysteresis motor is a permanent-magnet machine designed such that the stator magnetomotive force can produce and change the state of magnetization of the rotor material.
		Are the differences between hysteresis syncrounous motor and squirrel induction cage motor confined to the rotor?
	www.eng-tips.com /viewthread.cfm?qid=26261 (3393 words)

	Brushless DC electric motor - Wikipedia, the free encyclopedia
		Two subtypes exist: The three-phase AC synchronous motor has three electrical connections and the stepper motor has a lot of poles on to rotor and on the stator.
		In the 'outrunner' configuration, the radial-relationship between the coils and magnets are reversed; the stator coils form the center (core) of the motor, while the permanent magnets spin on an overhanging rotor which surrounds the core.
		A brushless DC motor (BLDC) is a DC electric motor that uses an electronically-controlled commutation system, instead of a mechanical commutation system.
	en.wikipedia.org /wiki/Brushless_motor (600 words)

	Brushless DC (BLDC) Motor
		A brushless DC (BLDC) motor is a rotating electric machine where the stator is a classic three-phase stator like that of an induction motor and the rotor has surface-mounted permanent magnets.
		In this respect, the BLDC motor is equivalent to a reversed DC commutator motor, in which the magnet rotates while the conductors remain stationary.
		Like a DC motor turned inside out, commutation done on windings
	freescale.com /webapp/sps/site/overview.jsp?nodeId=02nQXGrrlPY7r8hv0V (535 words)

	Brushless DC electric motor
		The motor has no brushes and no commutator in the traditional sense, but the role of the commutator is played by an electronic circuit, that switches the current to the different stator coils at the appropriate times.
		A brushless DC motor is an electric motor that operates like a DC motor, but with the roles of the rotor and stator reversed.
		Some brushless DC drive circuits use the back EMF in the undriven coils to sense the rotor position, so they do not need the Hall effect sensors.
	www.sciencedaily.com /encyclopedia/brushless_dc_electric_motor (288 words)

	Electric Motors for Vehicle Appilcations
		Stator coils which "see" a falling level of bias flux due to rotor poles passing the alignment point and going out of alignment are excited to subtract flux from the bias flux, thus weakening the reverse directed aligning force between that set of stator and rotor pole pairs.
		Stator coils which "see" a rising level of bias flux due to rotor poles coming into alignment are excited to add flux to the bias flux, thus increasing the aligning force between that stator and rotor pole pair set.
		But with the correct drive of the stator coil currents the aligning force is strengthened at the coming into alignment set of pole pairs and weakened at the going out of alignment set of pole pairs (negative of a negative effect).
	www.mccleerpower.com /emotors.html (288 words)

	The Adams Motor - Tim Harwood's Guide from The Encyclopedia of free energy,energy21.org,energy 21 org Geoff Egel
		According to a feature of the invention, the circuit connecting the electric current source and the stator magnetizing windings is designed to deliver current pulses which are of sufficient strength and duration to provide demagnetization of the stator poles as the stator and rotor poles separate from an in-register position.
		Stator wind depth can be set by placing a paper clip in front of a magnet pole face, and moving it closer until such time as frictional forces are overcome, and it flies into the face of the permanent magnet.
		The stator poles in the Jones machine are formed by the winding configuration in a slotted stator form, the many slots being uniformly distributed around the inner circumference of the stator and not constituting a pole system which lends itself to the magnetic flux actions to be described by reference to the E.B. Moullin experiment.
	www.icestuff.com /~energy21/adamsmotorguide.htm (288 words)

	Reliance Electric - Basic Motor Theory
		The stator is in the stationary electrical component.
		The S-pole of the rotor is attracted by the two N-poles of the stator and the N-pole of the rotor is attracted by the two south poles of the stator.
		Thus, as the magnetic field of the stator rotates, the rotor is forced to rotate with it.
	www.reliance.com /mtr/mtrthrmn.htm (288 words)

	Stator wedge tightness detector
		Loose stator wedges may lead to vibration and erosion of stator insulation in electric generators.
		Stator wedges are traditionally tested for tightness by tapping them with a hammer and listening to the sound produced.
		Electronic stator wedge tightness detection is faster, more accurate, provides more consistent results than traditional hand tapping methods, and the test procedure is repeatable.
	www.adwel.com /wtd.html (288 words)

	Armature, Stator, Field and Motor Testing Solutions Experts
		Since 1972, ESW has been committed to providing the electric motor industry with innovative state-of-the-art technology and professional motor testing and bonding solutions.
		Armature, Stator, Field and Motor Testing Solutions Experts
		If you are currently working on a project, or are considering improving your production line in the near future, give us a call and we will be happy to assist you in anyway possible.
	www.eswtesters.com (288 words)

	Commutator (electric) - Wikipedia, the free encyclopedia
		It typically consists of a set of copper contacts, fixed around the circumference of the rotating part of the machine (the rotor), and a set of spring-loaded carbon brushes fixed to the stationary part of the machine (the stator) that complete the electrical circuit from the rotor's windings to the outside of the machine.
		A commutator is an electrical switch that periodically reverses the current in an electric motor or electrical generator.
		Commutators enable motors to run on, and a generator to produce, usable energy.
	en.wikipedia.org /wiki/Commutator_(electric) (320 words)

	Glossary of Electric Motor Terms
		The AC induction motor is named because the electric current flowing in its secondary member (the rotor) is induced by the alternating current flowing in its primary member (stator).
		Commutator: The part of a DC motor armature that causes the electrical current to be switched to various armature windings.
		The commutator also provides the means to transmit the electrical current to the moving armature through the brushes that ride on the commutator.
	www.electricmotorwarehouse.com /Glossary.htm (2343 words)

	Reliance Electric - Basic Motor Theory
		The development of the electric motor has given us the most efficient and effective means to do work known to man. Because of the electric motor we have been able to greatly reduce the painstaking toil of man's survival and have been able to build a civilization which is now reaching to the stars.
		If electrical energy is supplied to a conductor lying normal to a magnetic field, resulting in current flow in the conductor, a mechanical force and thus mechanical energy will be produced.
		At time 2, the polarity of the stator poles is changed so that now C-2 and B-1 and N-poles and C-1 and B-2 are S-poles.
	www.reliance.com /mtr/mtrthrmn.htm (2343 words)

	Direct-current commutator motors (from electric motor) -- Britannica Concise Encyclopedia - The online encyclopedia you can trust!
		Large DC motors usually have four or more poles to reduce the thickness of the required iron in the stator yoke and to reduce the length of the end connections on the armature coils.
		Another form of commutator motor is the series motor in which the field coils, with relatively few turns, carry the same current as does the armature.
		Commutator motors with adjustable field current are known as shunt motors, or separately excited motors.
	www.britannica.com /ebc/article-45840 (1759 words)

	(WO 2005/018074) COMMUTATOR MOTOR AND ELECTRIC POWER DRILL
		(57) A commutator motor in which a field winding (1) wound around a stator (3) is connected with a rotor winding (4) wound around a rotor (6) through a commutator (7), and an AV power supply is connected with the field winding (1) and the rotor winding (4).
		A commutator motor in which the rotor can be sustained reliably in a stop state through a simple and inexpensive arrangement is thereby obtained.
		For information on time limits for entry into the national phase please click here
	www.wipo.int /ipdl/IPDL-CIMAGES/view/pct/getbykey5?KEY=05/18074.050224 (185 words)

	General Electric J79 - Wikipedia, the free encyclopedia
		It was a single-shaft turbojet with a 17-stage compressor, with a novel arrangement of variable stator blades that allowed the engine to develop pressure similar to a two-stage engine at a much lower weight.
		The J79 is about 17 feet (5.2 m) long, with a diameter of slightly over three feet (1 m) and a dry weight of 3,500 to 3,800 pounds (1,600 kg to 1,700 kg), depending on version.
		The J79 was lowered from the bomb bay and the four J47s were shut down leaving the B-45 flying on the single J79.
	en.wikipedia.org /wiki/General_Electric_J79 (185 words)

	Hydro
		Owing to the electro-mechanical installation of hydro electric power plants having traditionally been part of the very initial equipment to be insured, the standard of insurance for such installations has reached a level which hardly allows for any substantial revisions or improvements.
		During periods of peak electrical demand, water from the higher reservoir is released through turbines to the lower reservoir, and electricity is produced.
		Regular control of the windings in the stator reduces the possibility of occurrences that could cause a sever damage.
	www.imia.com /documents/hydro.htm (185 words)

	GE J79 Turbojet Engine
		General Electric Company's Flight propulsion Division, designer and manufacturer of the Super Starfighter's J-79 jet engine, is America's pioneer in the field.
		In 1941 General Electric produced the nation's first turbojet powerplant - designated the I-A. It weighed 780 pounds and had a thrust - or pushing power - measured at 1300 pounds.
		Pursuing its pioneering advantage, General Electric during World War II developed a new style engine built around an axial flow compressor.
	www.starfighters.nl /j79.html (185 words)

	Power Technology - Wood Group Gas Turbine Services - Maintenance Solutions for Gas Turbines and Other High-Speed Rotating Equipment
		For high voltage electrical generators, both turbo and hydro, used in the power generation and industrial markets, we offer the following services: repair and rewind of generators and HV motors; shop- and site-based emergency and scheduled services; rotor and stator rebuilds and maintenance; coil manufacture; and outage management.
		Wood Group Gas Turbine Services provides maintenance, outage, repair and overhaul services for light industrial, aero-derivative and heavy industrial gas turbines, steam turbines, generators, controls and other high-speed rotating equipment, including pumps, compressors, power turbines, gearboxes and HV motors, from dedicated service facilities around the world.
		We provide repair solutions for fuel nozzles and other accessories for most models of gas turbines used in the industrial, marine, power generation and oil and gas markets.
	www.power-technology.com /contractors/operations/wood_group (1293 words)

	single phase
		or between a single conduit and ground is single phase electric power.
		Single Phase and Three Phase General Construction Purpose Electrical Transformers, Acme and GE Transformers Sales.
		If we take a stator with a single winding, and apply a single phase voltage to it, we will have an alternating current...
	metadating.com /db/single+phase (689 words)

	88373.011122&ELEMENT_SET=DECL
		Generally, a reciprocating compressor is constructed such that a piston of the compressor is integrally combined with the armature (moving element) of a reciprocating electric motor, instead of using a crank shaft.
		The general operation of the reciprocating compressor having the stator supporting apparatus according to the present invention is similar to that of the conventional art.
		However, in the conventional reciprocating compressor as described above, only the front end of the inner stator is supported by the frame, and the rear end of the inner stator is left free as it is, and therefore the inner stator can not be fixed strongly.
	www.wipo.int /cgi-pct/guest/getbykey5?KEY=01/88373.011122&ELEMENT_SET=DECL (1383 words)

	Alternating current generator for vehicle - US Patent 6369474
		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.
		A copper wire having a high heat-resistant insulating film such as a polyamide-imide electric wire is used as the stator coil and the lead conductor is provided so that this copper wire (single core copper wire) extends from the stator coil.
		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 (1383 words)

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Topic: Stator (electric)

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In the News (Thu 31 Dec 09)