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Topic: Magnetomotive force

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	U.S. Patent: 6129073 - Electromagnetic fuel injector and control method thereof - October 10, 2000
		Magnetomotive force is expressed by the value U (=NI) obtained by multiplying the number of coil turns N (T) by the current I (A) flowing in a coil, and it can be used to evaluate the electromagnetic attraction force which can be attained for the short time At.
		Further, during valve closing operations, the magnetomotive force generated during the valve open hold period decays in response to interruption of the voltage to the hold coil 12, that is, the electromagnetic force decays.
		A magnetic attraction force attracting the plunger 15 is generated by the magnetic flux passing through a magnetic path in a magnetic circuit composed of the core 23, the yoke 24, and the plunger 15.
	www.everypatent.com /comp/pat6129073.html (11418 words)

	Magnetics
		The symbol for magnetomotive force is "F" and it is measured in Gilberts.
		The magnitude of the force depends on the speed of the electron, the flux density, and the angle of motion relative to the orientation of the field.
		The magnitude of the force is greatest when the vectors are at ninety degrees to one another and diminishes as the angle between the two vectors closes.
	ken-gilbert.com /techstuff/magnetics.html (4094 words)

	A Boyce's Electrical Webpage
		The unknown force that causes the field is referred to as the Magnetomotive force (mmf) of the magnet.
		Because a given number of lines of force may be spread over a large field or compressed into a relatively small field, it is necessary to know both the number of lines that make up the flux and the size of the area through which the lines of force pass.
		The ampere-turn is the unit for measuring the magnetomotive force of a current-carrying coil.
	ourworld.compuserve.com /homepages/boyce_smith/magnets.htm (2626 words)

	Glossary of Magnet Terminology
		This is the point at which the hysteresis loop crosses the B axis at zero magnetizing force, and represents the maximum flux output from the given magnet material.
		It is equal to the demagnetizing force which reduces the intrinsic induction, Bi, in the material to zero after magnetizing to saturation; measured in oersteds.
		Pull Force - The force required to pull a magnet free from a flat steel plate using force perpendicular to the surface.
	www.kjmagnetics.com /glossary.asp (2435 words)

	Magwerks Corporation
		The direction of the whorls of force can be determined by the "right-hand rule." When the wire is grasped by the right hand, the fingers encircling the wire, and the thumb pointing along the wire in the direction of the current, the fingers encircle the wire in the direction of the lines of force.
		This rule is used to determine in which direction the north pole would lie in a helix or solenoid of wire, for, instead of having a straight wire encircled by magnetic whorls, the wire itself is bent into a circular form by being wound in a solenoid or helix.
		When a substance having magnetic properties is placed in a magnetic field, the field intensity gives rise to a magnetizing force H within the body, and the substance acquires a certain magnetization I depending on H and upon the susceptibility of I/H of the substance.
	www.magwerks.com /Magnetic-Terms.htm (2525 words)

	Basic Electronics (Site not responding. Last check: 2007-11-03)
		Of course electromotive force is measured in volts; magnetomotive force is measured in the ampere-turn (At).
		The force that produces the magnetic field is called the magnetomotive force and its unit is the "ampere-turn".
		It is the reciprocal of permeance and is equal to the magnetomotive force divided by the magnetic flux.
	web.axs.net /jhutton/webstu15.htm (3301 words)

	Henry Wallace: Kinemassic Force Field
		It is the average density of all the zones that determines the magnitude of the anti-parallel field force vector in its opposition to the ambient gravitational field force vector.
		The absence of precessional forces permits a close tolerance to be established between the cooperating faces of the wheel structure 21, the pole pieces 23 and the mass circuit 44.
		However, establishing the necessary criteria for such a force field effects a polarization of the spin components of adjacent nuclei in a preferred direction thereby resulting in a force field which may be represented in terms of kinemassic field flux lines to the direction of spin.
	www.rexresearch.com /wallace/wallace.htm (16222 words)

	Glossary
		Coercive force, Hc The demagnetizing force, measured in Oersteds necessary to reduce the induction, B to zero after a magnet has been previously saturated.
		The condition existing in a material subjected to magnetizing force.
		The magnetomotive force per unit length at any point in the magnetic circuit.
	www.rare-earth-magnets.com /magnet_university/glossary.htm (227 words)

	Welcome to IRINFO - An Infrared View of Inductive Heating
		Magnetomotive force and magnetic flux (f) are related to each other by a property of magnetic materials known as reluctance.
		Magnetomotive force generated by an electromagnet coil is equal to the amount of current through that coil (in amps) multiplied by the number of turns of that coil around the core (the SI unit for mmf is the amp-turn).
		This skin effect forces the alternating current to flow in a thin layer close to and towards the surface of the object.
	www.irinfo.org /Articles/article_1_2007_sharlon.html (1617 words)

	Electomagnetism.
		F is the force in Newtons, N. B is the magnetic flux density in Teslas, T. I is the current in Amperes, A. l is the length of the conductor in metres, m.
		The magnetic field strength, H, is the magnetomotive force per unit length in a magnetic circuit.
		The ratio of the flux density B to the magnetic field strength H in vacuum is called the permeability of free space.
	www.hills2.u-net.com /electron/elecmag.htm (590 words)

	ipedia.com: Electromotive force Article (Site not responding. Last check: 2007-11-03)
		An electromotive force is the "force", measured in volts, that is produced by interaction between a current and a magnetic field, at least one of which is changing.
		An electromotive force (emf) is the "force", measured in volts, that is produced by interaction between a current and a magnetic field, at least one of which is changing.
		Since the word "force" now has a very specific meaning in physics, and an emf is not a force in this sense, the expansion of the acronym is considered obsolete; or at best, an embarrassing historical artifact.
	www.ipedia.com /electromotive_force.html (319 words)

	::ESSEN Magnetics:: (Site not responding. Last check: 2007-11-03)
		Magnetizing Force, H: The magnetomotive force per unit length at any point in a magnetic circuits.
		Magnetomotive Force, F: Analogous to voltage in electrical circuits, this is the magnetic potential difference between any two points.
		This is the point at which the hysteresis loop crosses the B axis at zero magnetizing force, and represents the maximumflux output from the given magnet material.
	www.magnetictool.com /service2.htm (627 words)

	CIPO - Canadian Patent Database - Claims - 2410806
		The magnetomotive stirring apparatus of claim 15 further including a mixing vessel positioned in the substantially cylindrical region for substantially containing the resultant magnetomotive force.
		The magnetomotive stirring apparatus of claim 16 wherein the mixing vessel is substantially electrically insulating and is substantially resistant to attack from molten metals.
		The magnetomotive stirring apparatus of claim 28 wherein the mixing vessel is substantially electrically insulating and is substantially resistant to attack from molten metals.
	patents1.ic.gc.ca /claims?patent_number=2410806&language= (629 words)

	Terme (Site not responding. Last check: 2007-11-03)
		The electromagnetic force that causes a magnetic flux to flow in a magnetic circuit.
		It is the total magnetizing force acting around a complete closed magnetic circuit, and corresponds to voltage ; electromotive force ; in an electric circuit.
		The cgs unit of magnetomotive force is the Gilbert, equal to about 0.8 ampere-turn.
	doc-telecom.enst-bretagne.fr /doc-telecom/terme.jsp?9641 (148 words)

	Electric Drives - Electrical Machine Fundamentals - Description and Applications
		In the case of a lateral displacement, the force diminishes as the distance increases, but in the case of a rotation, the force will increase reaching a maximum when the bar is at right angles to the external field.
		Forced cooling is not normally required for fractional horsepower machines but larger integral horsepower motors usually incorporate a built in cooling fan to force air through the machine.
		Forced air cooling can be effective in machines up to 50 megawatts but larger machines with multi megawatt power ratings, as used in the electricity generating industry, must resort to liquid cooling with the coolant being circulated through hollow conductors.
	www.mpoweruk.com /machines.htm (3494 words)

	Multiple motors controllers - Patent 5420486
		the sixth means to control electrical currents; to control the force and torque generated by the first motor and the second motor and the third motor and the fourth motor and the fifth motor and the sixth motor at the armature-common mechanical member with respect to the stator-common mechanical member.
		the seventh means to control electrical currents; to control the force and torque generated by the first motor and the second motor and the third motor and the fourth motor and the fifth motor and the sixth motor and the seventh motor at the armature-common mechanical member with respect to the stator-common mechanical member.
		As described and claimed in the reference patent, the various levels of force or torque in a respective multiple two-node windings electrical motor are obtained by operating electrical switches which energize various numbers of force or torque generating winding sets within the motor and by positioning a brush holder in the motor.
	www.freepatentsonline.com /5420486.html (10326 words)

	Chapter 1: Magnetism
		Thus magnetomotive force is similar to voltage, and magnetic flux is similar to current.
		The magnetomotive force is produced by the coil.
		The magnetic field strength is the magnetomotive force divided by the length of the magnetic circuit, which in our example is 16 centimeters.
	sci-toys.com /scitoys/scitoys/magnets/calculating/calculating.html (1239 words)

	Arnold - Glossary of Terms - (M)
		The CGS unit of magnetizing force is the oersted.
		The cgs unit of magnetomotive force is called a Gilbert and is defined by the equation:
		Magnetomotive force may also result from a magnetized body.
	www.arnoldmagnetics.com /mtc/glossary/glossary_m.htm (807 words)

	metre.info - Table of obsolete and unofficial units
		To differentiate whether an ampere is used to measure electric current or magnetomotive force, the name ampere-turn is sometimes used for magnetomotive force.
		Force that is exerted by one kilogram in the earth’s gravity field at sea level.
		Equals the gravitational force of one gram of mass on earth at sea level.
	web8.ehost-services.com /cdkaese/metre/obsoleteunits.htm (1627 words)

	Magnetics for Morons
		magnetomotive force and the reluctance of the loop.
		The symbol for magnetomotive force is "F" and it is measured in
		magnetizing force cause the permeability to the core to decline).
	www.jt30.com /jt30page/micKqanda/Magnetics-for-Morons.html (3212 words)

	Body
		The magnetomotive force acting over a length is defined as the integral of H (i.e., the component of H which is parallel to the path increment d
		That is, the force on a pole of permeable material is equal to the integral of a constant times B squared (times a directional vector) times area, over its surface.
		A net force is possible only if the field varies over the length of the part in such a way that the flux at one face is different from that at the face opposite to it.
	www.consult-g2.com /course/chapter1/chapter.html (4117 words)

	Definitions & Glossary of Terms - Neodymium magnets, Samarium cobalt magnets, Magnet assemblies, Magnetic components
		(or flux density), is the magnetic induction corresponding to zero magnetizing force in a magnetic material after saturation in a closed circuit; measured in gauss, shown in data as "Br".
		Magnetizing or demagnetizing force, is the measure of the vector magnetic quantity that determines the ability of an electric current, or a magnetic body, to induce a magnetic field at a given point; measured in oersteds.
		One oersted equals a magnetomotive force of one gilbert per centimeter of flux path.
	www.mceproducts.com /knowledge-base/glossary/index.asp (1717 words)

	[No title] (Site not responding. Last check: 2007-11-03)
		Magnetomotive force, also known as magnetic potential, is the property of certain substances or phenomena that gives rise to magnetic fields.
		Magnetomotive force is analogous to electromotive force or voltage in electricity.
		The Sun also generates magnetomotive forces, particularly in the vicinity of sunspots.
	searchwebservices.techtarget.com /termParser/1,290913,sid9_gci759327,00.html (173 words)

	Magwerks Corporation
		This characteristic is produced during manufacture of the material by orienting its crystalline structure and/or aligning its magnetic domains with a magnetic field during cooling after the material is cast.
		The demagnetizing force that is required to reduce to zero the residual magnetism (Br) in a previously saturated magnet.
		Reference points on this curve are designated by the symbols Bd and Hd which indicates the value of magnetic induction remaining in the material (B) while a given demagnetizing force (H) is applied.
	www.magwerks.com /glossary.htm (1626 words)

	Britannica Concise Encyclopedia - The online encyclopedia you can trust!
		In the magnetic circuit a magnetomotive force F, or Fm, is defined as the ampere-turns of the coil that generates the magnetic field to produce the magnetic flux in the circuit.
		Thus, if a coil of n turns per metre carries a current i amperes, the field inside the coil is ni amperes per metre and the magnetomotive force that it generates is nil ampere-turns, where l is the length of the coil.
		In an electric circuit the electromotive force (E) is related to the current, i, in the circuit by E = Ri, where R is the resistance of the circuit.
	www.britannica.com /ebc/print_toc?tocId=9032309 (631 words)

	Mutual inductance and basic operation : TRANSFORMERS
		Magnetomotive force (mmf) and magnetic flux (Φ) are related to each other by a property of magnetic materials known as reluctance (the latter quantity symbolized by a strange-looking letter “R”):
		Because mmf is proportional to current through the magnetizing coil (mmf = NI, where “N” is the number of turns of wire in the coil and “I” is the current through it), the large increases of mmf required to supply the needed increases in flux results in large increases in coil current.
		Magnetomotive force is produced any time electrons move through a wire.
	www.allaboutcircuits.com /vol_2/chpt_9/1.html (3718 words)

	FEEE - Fundamentals of Electrical Engineering and Electronics: Electromagnetism
		The amount of magnetic field force generated by a coiled wire is proportional to the current through the wire multiplied by the number of "turns" or "wraps" of wire in the coil.
		This field force is called magnetomotive force (mmf), and is very much analogous to electromotive force (E) in an electric circuit.
		The magnetic field force produced by an electromagnet (called the magnetomotive force, or mmf), is proportional to the product (multiplication) of the current through the electromagnet and the number of complete coil "turns" formed by the wire.
	www.vias.org /feee/magnet_03.html (701 words)

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