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Topic: Rotating magnetic field

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Electromagnetic field

Lorenz force

Magnetism

Dynamo theory

North Pole

Tesla patents

Electric motor

War of Currents

Nikola Tesla

Electricity generation

Polyphase system

Three phase

Egg of Columbus

Toroid

	MAGNETIC FIELD : Encyclopedia Entry
		Thus, according to Einstein's field transformation equations (that is, the Lorentz transformation of the field from a proper reference frame to a non-moving reference frame), part of it is manifested as an electric field component.
		The "north" and "south" poles of a magnet or a magnetic dipole are labelled similarly to north and south poles of a compass needle.
		It is a response of a medium to the presence of a magnetic field.
	www.bibleocean.com /OmniDefinition/Magnetic_field (3223 words)

	Magnetic field - Wikipedia, the free encyclopedia
		As seen from the definition, the unit of magnetic field is newton-second per coulomb-meter (or newton per ampere-meter) and is called the tesla.
		The direction of magnetic field lines is defined as the direction of orientation of magnetic dipole—say, a small magnet or a loop of current in the magnetic field.
		The "north" and "south" poles of a magnet or a magnetic dipole are labelled somewhat confusingly in comparison to the geographic north and south poles.
	en.wikipedia.org /wiki/Rotating_magnetic_field (1691 words)

	INDUCTION MOTOR (Site not responding. Last check: 2007-10-15)
		The north pole of the rotating magnetic field attracts the south pole of the magnet, and the south pole of the rotating magnetic field attracts the north pole of the magnet.
		If the rotor and the rotating magnetic field were turning at the same speed no relative motion would exist between the two, therefore no lines of flux would be cut, and no voltage would be induced in the rotor.
		The rotating magnetic field induces a voltage in the rotor windings.
	www.geocities.com /vijayakumar777/inductionmotor/inductionmotor.html (2738 words)

	[No title] (Site not responding. Last check: 2007-10-15)
		MAGNETIC FIELD GENERATION This invention relates to magnetic field generation and, in particular, is concerne with generating a rotating magnetic field.
		The magnetic field strength is such that each strip or wire only comes out of magnetic saturation for a small range of field angles, during which a subsidiary a.
		A device for generating a magnetic field characterised in that the device comprises a permanent magnet mounted for rotation and dispose within the windings of a coil.
	www.wipo.int /cgi-pct/guest/getbykey5?KEY=99/23741.990514&ELEMENT_SET=DECL (924 words)

	Rotating Magnetic Field
		In figures 4 and 5 the magnetic field of the underside of the coil is depicted.
		This indicates that the center of the coil is not a magnetic pole at all.
		The magnetic field pattern of the coil produced the opposing magnetic fields the experiment was intended to produce.
	www.tesla-coil-builder.com /rmfd_experiment.htm (985 words)

	Rotating Magnetic Field (rmfd) Constant
		The rmfd constant is also the quantum unit of rotating magnetic field.
		In addition to being the rotating magnetic field for each particle, it is also the unit of space-time involving Coulomb's constant.
		In rmfd, the geometry of Coulomb's constant is modified by the geometrical constant of 16
	www.16pi2.com /rmfd_constant.htm (497 words)

	[No title] (Site not responding. Last check: 2007-10-15)
		Background of the Invention The basic principal of nearly all electrical rotating machinery is that a current of electrical charge located within a magnetic field will experience a force perpendicular both to the flow of charge and the lines of force of the magnetic field.
		The rotating magnetic field is produced by coils of wire or windings, suitably placed in the stator.
		Rotation is about the axis of the cylinder, lines of magnetic flux pass through the cylinder normal to the cylinder, and current flow in both the stator conductors and the rotor conductors is parallel to the axis of the cylinder.
	www.wipo.int /cgi-pct/guest/getbykey5?KEY=03/73598.030904&ELEMENT_SET=DECL (7487 words)

	Glossary (Site not responding. Last check: 2007-10-15)
		Magnetic reconnection can occur when plasma flows through a neutral point or a neutral line at which the intensity of the magnetic field is zero and its direction is not defined.
		A magnetic storm is marked by the injection of an appreciable number of ions from the magnetotail into the ring current, a process accompanied by increased auroral displays.
		The magnetic field observed at any point in space is a vector; other examples are velocity, acceleration, force and the electric field, which maps the electric force acting on ions and electrons.
	www.phy6.org /Education/gloss.html (5877 words)

	TFCBooks -- Tesla Site Glossary
		In the far zone, field components (E and H) lie transverse to the direction of the propagation, and the shape of the field pattern is independent of the radius at which it is taken.
		In the near and intermediate zones, the field patterns are quite complicated, and the shape is, in general, a function of the radius and angular position (azimuth and elevation) in front of the antenna.
		Faraday rotation The orientation of the electric field vector of an electromagnetic wave propagating parallel to a magnetic field embedded in a plasma rotates as the wave propagates.
	www.tfcbooks.com /mainpage/glossary.htm (12269 words)

	Rotating Magnetic Fields (Site not responding. Last check: 2007-10-15)
		Rotating magnetic fields are capable of producing very strange effects.
		It is quite simple to construct a system that would have a rotational velocity of C within the uniform field area.
		Some really interesting paradoxes come about when the rotational frequency is high enough so that the rotational velocity exceeds C within the uniform field area of the arrays or within the hemholtz coils.
	www.pxarchive.de /home/tech/rotate.html (449 words)

	TIB0203 Bubble Memory
		A rotating magnetic field created by two mutually perpendicular coils causes the data in the form of magnetic bubbles to move serially through the magnetic field in a manner similar to data in a semiconductor shift register.
		The magnetic field of the serpentine domains tends to line up primarily along a single axis (the "easy" axis) that is perpendicular to the plane of the film.
		If an external magnetic field is applied, its energy tends to expand domains polarized in the direction of the field and to shrink those polarized opposite to the field until they become small cylinders embedded in a background of opposite magnetization.
	www.decodesystems.com /tib0203.html (2311 words)

	TYPESOFACMOTORS (Site not responding. Last check: 2007-10-15)
		Assume that poles A and B are being rotated clockwise by some mechanical means in order to produce a rotating magnetic field, they induce poles of opposite polarity in the soft iron rotor, and forces of attraction exist between corresponding north and south poles.
		The rotor may be a permanent magnet, as in small single phase synchronous motors used for clocks and other small precision equipment, or it may be an electromagnet, energized from a dc source of power and fed through slip rings into the rotor field coils, as in an alternator.
		The magnetic field of the rotor locks with the magnetic field of the stator and the motor operates at synchronous speed.
	avstop.com /AC/apgeneral/TYPESOFACMOTORS.html (3515 words)

	PowerPedia:Magnetic field - PESWiki
		A changing electric field can be caused by the movement of an electrically charged object, as in an electric current; or a combination of the orbit of an electron around an atom and the spin of electrons themselves, as in a permanent magnet.
		Magnetic field density, otherwise known as magnetic flux density, is essentially what the layman knows as a magnetic field —akin to a gravitational or electric field.
		Separating the electric field of moving charge into stationary electric and magnetic components (as measured by a stationary observer)—which are usually labeled as E and B—replaces complex Einstein relativistic field transformation equations by more compact and elegant mathematical statements known as Maxwell's equations.
	peswiki.com /index.php/PowerPedia:Magnetic_field (3059 words)

	Drive field for circular magnetic domain devices - Patent 4001792 (Site not responding. Last check: 2007-10-15)
		This is accomplished by means of a rotating magnetic field in the plane of the soft magnetic pattern which operates in addition to a steady bias magnetic field applied normally to the thin magnetic layer.
		The rotating magnetic field is generated by two pairs of coils arranged with their axes at right angles to each other but in the plane of the soft magnetic pattern and the thin magnetic layer.
		A steady bias magnetic field is applied to the layer 1 in known manner by bias magnets 6, the magnetic field produced by the magnets 6 being directed along the axis Z--Z. As stated in a preceding paragraph it is necessary, as is illustrated in FIG.
	www.freepatentsonline.com /4001792.html (2038 words)

	Rotating magnetic fields
		Another magnetic field in the rotor can be made to chase it by being attracted and repelled by the stator field.
		To establish a rotating magnetic field in a motor stator, the number of pole pairs must be the same as (or a multiple of) the number of phases in the applied voltage.
		Since the magnetic fields generated in the coils are in phase with their respective currents, the magnetic fields are also 90° out of phase with each other.
	www.tpub.com /neets/book5/18a.htm (692 words)

	MOLECULAR SPINNERETS FOR POLYMERIC FIBERS
		As the discotic molecular columns are made to rotate in a synchronized fashion, they will pull polymer molecules supplied at the top surface of the membrane, organize and orient them to develop the required structure, and release the fiber at the bottom surface (Figure).
		If the columnar mesophase undergoes rotation in a rotating magnetic field, then a nanofiber of poly(methacrylic acid) may be produced in a rotating magnetic field by hydrolyzing the polyester bonds.
		Since incorporation of metals can facilitate controlled rotation of discotics in a rotating magnetic field, columnar polymeric phthalocyanines which contain metals such as copper, zinc, cobalt, nickel and lead will be synthesized with required end groups to act as molecular hooks.
	www.p2pays.org /ref/04/03835.htm (1326 words)

	[No title] (Site not responding. Last check: 2007-10-15)
		The synchronous machine rotor is ' ' excited by dc current producing fixed magnetic poles which rotate ' ' in synchronism with the stator rotating field.
		The rotor ' ' currents in turn produce a rotating magnetic field with the same ' ' speed as that of the stator field, irrespective of the speed of the' ' rotor.
		The interaction of these fields produces a torque on the ' ' rotor, and this is the basis of the induction motor.
	people.msoe.edu /~saadat/Rotfield.m (267 words)

	Alternator Summary
		Faraday showed that voltage could be produced by magnetism provided three conditions existed: there had to be a conductor in which to induce the voltage, a magnetic field had to be close to the conductor, and a relative motion had to occur between the magnetic field and the conductor.
		The rotor magnetic field may be produced by induction (in a "brushless" generator), by permanent magnets (usually in very small machines), or by a rotor winding energized with direct current through slip rings and brushes.
		The result of adding the fields (eg., sum of three 120-degrees phased waves) of the three coils is a single magnetic field, of constant magitude, which rotates in space at the same frequency as the applied currents, or in a synchronous manner.
	www.bookrags.com /Alternator (3072 words)

	Single Phase Induction Motors
		The frequency of the current flowing is equal to the difference between the rotational speed of the stator field and the rotor.
		The rotor current causes a rotor magnetic field which is spinning relative to the rotor at the rotor current frequency and relative to the stator, at the same frequency as the stator field.
		In the case of the counter rotating field, the frequency of the induced current will be almost twice line frequency and so the inductance of the rotor will play a much greater role in limiting the rotor current.
	www.lmphotonics.com /single_phase_m.htm (1197 words)

	Magnetic Resonance (Site not responding. Last check: 2007-10-15)
		If a rotating magnetic field (in the x-y plane) is applied perpendicular to the static magnetic field (in the z-direction), then the magnetic moment will precess about an effective magnetic field in a rotating frame of reference with the same frequency as the rotating magnetic field.
		By turning on the rotating magnetic field for only a short time, it is possible to rotate the average magnetic moment from the z-direction to the x-y plane.
		This produces a time varying magnetic field in the x-y plane, which can be observed via an induced EMF in a pick-up coil.
	www.phys.ufl.edu /~selman/teaching/fall01/lecture20.html (139 words)

	Magnetic field Summary
		Outside the magnet, the direction of the field is represented by imaginary force lines called magnetic flux lines, which always flow in a closed loop from the north pole to the south pole.
		This law is commonly used to calculate the magnetic field resulting from an electric current distribution in straight wires or in the center or on the axis of a current loop.
		The magnetic field produced by the aligned magnetic moments of paramagnetic materials strengthens the external field, but at standard temperatures it averages no more than 10 times stronger than a diamagnetic field and is, therefore, still very weak.
	www.bookrags.com /Magnetic_field (6250 words)

	Basics of Motors and Drives
		Since this field is rotating and magnetically interlocked with the rotor, the rotor is dragged around with the stator field.
		The rotating magnetic field in the stator coils, in addition to inducing voltages in the rotor bars, also induces voltages in the stator and rotor cores.
		If the rotor rotated as fast as the stator magnetic field, the rotor conductor bars would appear to be standing still with respect to the rotating field.
	www.pacontrol.com /Motor1.html (2098 words)

	How Things Work - Electric Motors
		The magnetic interaction between the stator and the rotor is repulsive--the rotor is pushed around in a circle by the stator's magnetic field; it is not pulled.
		The nature of the magnetism in the rotor causes it to be dragged along with the rotating magnetic fields around it and it begins to turn with those fields.
		Both the rotor and the stationary structure (the stator) are magnetic and their magnetic poles are initially arranged so that the rotor must turn in a particular direction in order to bring its north poles closer to the stator's south poles and vice versa.
	howthingswork.virginia.edu /electric_motors.html (2559 words)

	Genesis of Free Power Generation
		Irrespective of the fact whether the blocks are lifted or not, the power to the magnet remains constant, and this shows that work is being done by the magnetic field of the magnet without the flow of the corresponding energy (in addition to the constant power for magnetic excitation) from any external source.
		The magnetic field is concluded to be the conversion of the spatial velocity field itself when electron is in motion relative to space.
		During super-position of electric fields, as noticed in the creation of neutral state of matter when positive and negative charges meet, or when oppositely directed magnetic fields occupy the same region of space, the original-field strengths are restored when the initial conditions prior to the superposition are re-established.
	depalma.pair.com /Tewari/Chap7.html (1654 words)

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