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Topic: Magnetic circuit

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	Magnetic circuit - PatentStorm (Site not responding. Last check: 2007-10-19)
		A brake for a hoist, includes a brake disk and a magnetic filed which is aligned transversely to the brake disk and generates a reactive force which inhibits a movement of the brake disk and is dependent on the rotation speed of the brake disk as well as a radial distance from the rotation axis....
		The present invention relates to a magnetic adjustable loading wheel for an exercise apparatus, comprising a flywheel having a metal conductor fixed at the inner rim thereof; a stator disk disposed at the inner side rim of the flywheel; and a pair of resilient pieces mounted on the stator disk, a...
		Disclosed is a magnetic brake system for a vehicle, comprising: a plurality of brake disk solenoids for generating the magnetic force; a plurality of brake pad solenoids for generating the magnetic force; a braking sensor for detecting whether a brake pedal is applied; a wheel speed sensor for...
	www.patentstorm.us /class/188/164-Magnetic_circuit.html (3423 words)

	Tengam Engineering, Inc. ::: Magnetic Glossary
		Magnetic induction is the flux per unit area normal to the direction of the magnetic path.
		The average value of magnetic induction over the area of the air gap, Ag; or it is the magnetic induction measured at a specific point within the air gap; measured in Gauss.
		The north pole of a magnet, or compass, is attracted toward the north geographic pole of the earth (which is actually, by definition, a magnetic south pole), and the south pole of a magnet is attracted toward the south geographic pole of the earth.
	www.tengam.com /html/magnetic.html (1783 words)

	Untitled Document
		A piece of soft iron that is placed on or between the poles of a magnet, decreasing the reluctance of the air gap and thereby reducing the flux leakage from the magnet.
		That portion of the magnetic flux that is lost through leakage in the magnetic circuit due to saturation or air-gaps, and is therefore unable to be used.
		Reluctance, R: Analogous to resistance in an electrical circuit, reluctance is related to the magnetomotive force, F, and the magnetic flux by the equation R = F/(Magnetic Flux), paralleling Ohm's Law where F is the magnetomotive force (in cgs units).
	www.magnetsales.com /Design/Glossary_frames/frame_gbod.htm (1508 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.
		Magnetic Circuit - Consists of all elements, including air gaps and non-magnetic materials that the magnetic flux from a magnet travels on, starting from the north pole of the magnet to the south pole.
		Magnetic Field Strength (H) - 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.
	www.kjmagnetics.com /glossary.asp (2440 words)

	Glossary of Terms
		Unchanging magnetic or electric phenomena can often be handled by just considering the magnetic or the electric field alone; however wave phenomena such as radio and light involve a tight interplay of time-varying electric and magnetic fields, viewed as manifestations of their electromagnetic fields.
		Magnetic poles are just an observed consequence of the way magnetic field lines are channeled by the bar: actually, the bar's magnetization is evenly spread inside it and is not concentrated at its ends.
		However, the magnetic field near the surface of the Earth (and at any other location where electric currents are absent) is of a relatively simple kind, describable by a single varying quantity--an ordinary number or "scalar", as distinct from a vector.
	www.drpawluk.com /glossary.htm (4597 words)

	Magnetic circuit - Wikipedia, the free encyclopedia
		If Φ is the magnetic flux in the circuit, in webers; F is the magnetomotive force applied to the circuit, in ampere-turns; and R is the reluctance of the circuit, in ampere-turns per weber, then it follows from Ampere's law that:
		This is analogous to Ohm's law in electrical circuits, where the current is equal to the voltage (sometimes called electromotive force) divided by the resistance of the circuit.
		Magnetic circuits can be solved for the flux in each branch by application of the magnetic equivalent of Kirchhoff's Voltage Law (KVL) for pure source/resistance circuits.
	en.wikipedia.org /wiki/Magnetic_circuit (465 words)

	Magnetic sensor - Patent 6587048
		The portion of magnetic flux 50 that bypasses the magnetic circuit 38 increases the load upon the coil driver 68, which increase is sensed by the sense/test circuit 56 from the voltage across and the current through the at least one coil 42.
		The fore and aft ends of the door 14 are magnetically connected in series with the remainder of the magnetic circuit 38 by the hinges 18 and the coupling of the latch/lock mechanism 20 to the striker 22.
		The magnetic flux 50 sensed by the coils 42.1, 42.2 or 42.3 changes responsive to the movement of the door, thereby enabling the lateral position and velocity of the door 14 to be measured from that change.
	www.freepatentsonline.com /6587048.html (5783 words)

	Circuit Protection Primer
		Circuit protection systems limit overloads to a single circuit, and minimize the danger of fire in both the equipment, and the circuit leading to and from it.
		Thermal mechanical circuit breakers are dependent on a rise in temperature of the thermal sensing element to cause the breaker to trip.
		Magnetic breakers operate on the solenoid principle where a movable core held with a spring in a tube and damped with fluid is tripped by changes in the magnetic field of a series coil.
	www.rainshadowinc.com /primer.html (1051 words)

	CBI -- Technology: Hydraulic Magnetic
		Hydraulic Magnetic Circuit Breakers operate on the magnetic force produced by the load current flowing through a series connected solenoid coil which is wound around a hermetically sealed tube containing an iron core, a spring and a dampening fluid.
		At currents below the circuit breaker rating, the magnetic flux in the solenoid is insufficient to attract the core towards the pole piece due to the spring pressure.
		With high values of overloads or short circuit, the magnetic flux produced by the coil is sufficient to attract the armature to the pole face and trip the breaker even though the core has not moved.
	www.cbibreakers.com /magnetic.asp?menu=sixth (344 words)

	Heat transfer testing of thermal-magnetic circuit breakers
		It is sometimes assumed by investigators that a tripped circuit breaker is the result of an overcurrent condition either before or during the fire.
		Since thermal-magnetic circuit breakers employ thermal sensors, it should be possible for the heat from a fire to be transferred by convection, conduction, and radiation into a circuit breaker and cause it to trip in the absence of an overcurrent condition.
		This paper reviews the operating principle of thermal-magnetic circuit breakers, describes a series of heat transfer tests conducted on nine circuit breakers of various ratings and from various manufacturers, presents the results of the tests in graphical form, and discusses the potential impact of conduction and convection heat transfer on circuit breaker performance during fires.
	www.astm.org /JOURNALS/FORENSIC/PAGES/3129.htm (350 words)

	Magnetic Design
		Using the Biot-Savart law, which determines the magnetic field contribution of a current carrying element, it is possible to calculate the flux density along the axis of a permanent magnet of simple shapes.
		For a cylindrical magnet magnetized axially, with radius (r) and length (l), the flux density at a distance (d) from the surface, along its axis, is given by:
		Beginning with an ideal circuit where there is no flux leakage and no reluctance in the steel, this approach then makes use of empirically determined relationships to accurately model a magnetic circuit.
	labcontrol.pqui.utfsm.cl /~wally/Manuals/General/Magnetic/magnetic.htm (1972 words)

	Magnetic core Information
		A magnetic core is the core of an electromagnet or inductor.
		In radio circuits, a dob of wax or resin is used once the inductor has been tuned to prevent the core from moving.
		Using this technique, the magnetic core is equivalent to many individual magnetic circuits, each one receiving only a small fraction of the magnetic flux (because their section is a fraction of the whole core section).
	www.bookrags.com /wiki/Magnetic_core (1214 words)

	Electric and Magnetic Fields
		Magnetic fields determine the properties of quasars and neutron stars, as well as erupting as magnetic storms during solar flares.
		The earth's mild magnetic field has been known since antiquity, and magnetic fields manifest in more subtle forms as permanent magnets, in electric motors and electric power generators, in permanent magnetic information storage devices, and down to the quantized magnetic fields that are trapped in superconducting material.
		Magnetic fields are most commonly experienced in the form of permanent magnets, which have a south (S) and a north (N) pole.
	srikant.org /core/node8.html (5742 words)

	Electric circuit board current sensor - Patent 4893073
		A magnetic sensor is retained in the opening; and a flux member retained by the notch and opening forms a magnetic circuit around the current trace to concentrate current induced flux through the magnetic sensor.
		A magnetic sensor 30, such as a Hall effect device, is retained in opening 17 between free ends 23 and 27 of flux member 20, with a flat portion extending over the circuit board and leads projecting downward through some of openings 12 for soldering into the circuit.
		The sensor output of magnetic sensor 30 is provided to a digital sampler for application to a digital control, the sampler having a sampling rate, such as 70-1,000 Hz, which is low compared to the switching noise in the current to be measured.
	www.freepatentsonline.com /4893073.html (1889 words)

	Industrial Magnetics, Inc. - Transfer Conveyors
		The release circuit is only energized for the amount of time required to release the part, which significantly reduces the cost of operation over a purely Electromagnetic Rail system.
		Using a powerful electro-magnetic circuit to move and hold steel objects during conveying, electromagnets have the benefit of on/off capability and allow the user to control drop points throughout the system.
		Magnetic Skate Rail is typically positioned on the outside edge of a steel blank and parallel to the magnetic transfer conveyor.
	www.magnetics.com /ag/conveyorstran.asp (328 words)

	Hirst Magnetic Instruments Ltd/character/char_p2.shtml
		In a closed magnetic circuit, the magnetic flux of the sample being measured, is conducted through a ferrous path, often supplied by an elector magnet, that can also apply the magnetic field used in the measurement.
		In an open magnetic circuit the sample is magnetically in free air.
		As this measurement is dependent upon the shape of the sample, it is neccesary to convert an Open Magnetic Circuit measurement to a Closed Magnetic Circuit measurement.
	www.hirst-magnetics.com /character/char_p2.shtml (243 words)

	Magnetic reactance - Wikipedia, the free encyclopedia
		Magnetic reactance [1-3] is the component of complex magnetic impedance of the alternating current circuit, which produces the phase shift between a magnetic current and magnetic tension in the circuit.
		The angle of the phase shift in a magnetic circuit
		On a complex plane the magnetic reactance appears as the side of the resistance triangle for circuit of an alternating current.
	en.wikipedia.org /wiki/Magnetic_reactance (188 words)

	BWCM - E&M - DC Electric and Magnetic Circuits
		Since an electric or magnetic field can create a force of attraction or repulsion, it is possible to build up potential energy by moving an object which experiences the force against the force direction, similar to lifting a weight against gravity.
		When magnetic fields interact with magnetic materials (like iron or nickel), one can consider the magnetic field vectors to be like a flow of "magnetic current" through the material.
		An externally applied magnetic field (say, by a bar magnet) causes a magnetic field in the material which changes according to the permeability, cross-sectional area, and length of the material.
	www.rocket-roar.com /BWCM/em/circuits.html (1526 words)

	How Circuit Breakers Work
		These breakers operate on a magnetic field caused by electrical current passing through the coil of an electro-magnet.
		Thermal-magnetic circuit breakers Thermal and thermal-magnetic breakers are best suited for general purpose applications such as protecting wiring systems from overload and short-circuit damage.
		The magnetic part of "thermal-magnetic" refers to the magnetic trip element that comes into play at short-circuit currents.
	www.geeco.com /works.htm (335 words)

	Lessons In Electric Circuits -- Volume VI (Experiments) - Chapter 4
		Detectors are intended to be used for balancing bridge measurement circuits, potentiometric (null-balance) voltmeter circuits, and detect extremely low-amplitude AC ("alternating current") signals in the audio frequency range.
		Using the audio detector circuit explained earlier to detect AC voltage in the audio frequencies, a coil of wire may serve as sensor of AC magnetic fields.
		This rotor magnet coil (called the field coil, or simply field) is energized by battery power, so that it takes a small amount of electrical power input to the alternator to get it to generate a lot of output power.
	www.ibiblio.org /obp/electricCircuits/Exper/EXP_4.html (8428 words)

	Electromagnetism and Inductance
		The complete path from N pole to the S pole, external to the magnet, then returning to the N pole internal to the magnet is called a magnetic circuit.
		This magnetic circuit can be compared to an electrical circuit --- the magnetizing force can be compared to voltage and the lines of force can be compared to current.
		When two magnets are brought together, the attractive (or repelling) force between them is inversely proportional to the square of the distance between them.
	www.hcc.hawaii.edu /~sdunan/cent112/notes/06BElectromagnetism (2192 words)

	Arnold - Glossary of Terms - (M)
		Unlike electric current where there is an actual flow of electrons, a magnetic field is the result of the energy state of a series of magnetic domains.
		An applied magnetic field used to drive another material to a condition of being magnetized.
		It may be applied by current through a coil of wire or by using permanent magnets to generate the applied field.
	www.arnoldmagnetics.com /mtc/glossary/glossary_m.htm (807 words)

	Fluxtrol Inc.- Induction Heating Magnetic Flux Concentrators
		It is a parameter of the component of the electric circuit or of the whole circuit.
		Magnetic flux may be compared to a flow rate of liquid.
		In a magnetic circuit, ampere-turns of the coil (driving force for magnetic flux) push magnetic flux through the reluctance of a certain area.
	www.fluxtrol.com /index.asp?pgid=46 (1901 words)

	PHOENIX CONTACT \| Products \| (IEC) Terminal Blocks \| Compact Thermal-Magnetic Circuit Breaker
		Thermal-magnetic circuit breakers have a thermal circuit interruption function and a magnetic interruption function.
		The magnetic function responds to very high current overloads such as those that might occur during short-circuit conditions.
		Thermal circuit breakers use heat-sensitive bimetallic elements that respond to overload electrical currents.
	www.phoenixcon.com /products/terminalblocks/circuitbreakers/indexmain.asp (241 words)

	Circuit Analysis in the Presence of Time-Varying Magnetic Fields - Maxim/Dallas
		With no magnetic field present, one commonly uses KVL and Ohm's law to perform a circuit analysis based on the mesh technique.
		To illustrate the effect of a time-varying magnetic field, consider the response of a simple closed-loop circuit (formed by a battery and two resistors) with and without the field.
		Magnetic interference from an electric motor in Figure 4b causes a peak at 300Hz, about 78.5dBc down from the audio test tone—an improvement of 16.5dB over the circuit of Figure 5a.
	www.maxim-ic.com /appnotes.cfm/appnote_number/3651 (2145 words)

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