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Topic: Magnetic bearing

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Bearing (mechanical)

Magnetic levitation train

Bearing (mechanical)

	Magnetic Bearing
		Magnetic bearings support moving machinery without physical contact, for example, they can levitate a rotating shaft and permit relative motion without friction or wear.
		In this program, AVCON developed the basic hybrid magnetic bearing approach that characterizes its commercial products, an approach in which both permanent magnets and electromagnets are employed to suspend a shaft; the permanent magnets provide suspension, the electromagnets provide control.
		Analyses of AVCON bearing tests showed that a hybrid magnetic bearing was typically only one-third the weight, substantially smaller and dramatically less power-demanding than previous generations of magnetic bearings.
	www.sti.nasa.gov /tto/spinoff1996/62.html (489 words)

	Magnetic bearing - Wikipedia, the free encyclopedia
		Magnetic bearings are commonly used in watt-hour meters used by electric utilities to measure home power consumption.
		Magnetic bearings are also used in high-precision instruments and to support equipment in a vacuum, for example in flywheel energy storage systems.
		In addition, it is difficult to build a magnetic bearing using permanent magnets due to the limitations of Earnshaw's theorem, and techniques using diamagnetic materials are relatively undeveloped.
	en.wikipedia.org /wiki/Magnetic_bearing (373 words)

	U.S. Patent: 5111102 - Magnetic bearing structure - *
		A magnetic bearing structure is provided for supporting a rotatable member in a suspended position relative to a stationary member utilizing a constant flux axially polarized magnetic field and a variable flux radially polarized electromagnetic field.
		Magnetically permeable rotors which may be of a laminate construction, are fixed to the armature generally opposite each arcuately shaped ring to define the pair of air gaps through which substantially all of the magnetic flux generated by a permanent magnet and the electromagnets is directed.
		This permanent magnet is axially polarized, and generally cylindrical pole pieces 20 abut the north and south pole surfaces of the permanent magnet 18 and extend therefrom to opposite ends of the housing 12.
	www.everypatent.com /comp/pat5111102.html (0 words)

	Magnetic declination - Wikipedia, the free encyclopedia
		The magnetic declination at any point on the Earth is the angle between the local magnetic field -- the direction the north end of a compass points -- and true north.
		In navigation the terminology of geomagnetism is used differently and in particular magnetic declination is divided into two parts namely Magnetic Variation and Magnetic Deviation, there are also three types of bearings True, Magnetic and Compass which are related by the rules.
		Magnetic variation is the difference between True Bearings and Magnetic Bearings and is caused by the different locations of the Geographic North Pole and the Magnetic North Pole plus any local anomalies like iron deposits.
	en.wikipedia.org /wiki/Magnetic_declination (0 words)

	Motor having a magnetic bearing - Patent 6849978
		The fan assembly having a magnetic bearing as described in claim 1, wherein the rotor includes the plurality of fan blades and is limited to a balanced position in accordance with magnetic forces from the magnetic units and wind force generated by the fan blades during rotation.
		The fan assembly having a magnetic bearing as described in claim 6, wherein the rotor includes the plurality of fan blades and is limited to a balanced position in accordance with magnetically repulsive forces from the magnetic unit and wind force generated by the fan blades during rotation.
		To avoid friction between the rotor 14 and the bearing 50, the lower surface 520 of the second magnetic element 2 and the upper surface 530 of the third magnetic element 3 of the magnetic unit in the embodiment are magnetically repulsive.
	www.freepatentsonline.com /6849978.html (0 words)

	Magnetic bearing apparatus - Patent 5923559
		A magnetic bearing apparatus comprises a first magnetic bearing for levitating a rotary body by magnetic attraction forces in an axial direction thereof and a second magnetic bearing for levitating the rotary body by magnetic attraction forces in a radial direction thereof.
		A magnetic bearing apparatus according to claim 7; further comprising storage means for storing the first and second digital signals outputted by the second A/D conversion means; and wherein the calculating means calculates the control currents on the basis of the first digital signal and the second digital signals stored in the storage means.
		The control system of the magnetic bearing apparatus according to the present invention is provided with a microprocessor 13 for processing a predetermined calculation, to be described later, for controlling a magnetically floating position of a rotor 1 to a center or the like of magnetic bearings 2 and 3.
	www.freepatentsonline.com /5923559.html (0 words)

	eBearing - Bearing Industry Resources
		Bearing stiffness was found to be a strong function of bearing deflection, with higher deflection producing markedly higher stiffness.
		Bearings operating with radial clearances less than the optimum exhibit load capacity coefficients that are a strong function of radial clearance and are prone to a thermal runaway failure mechanism and bearing seizure.
		Bearings with a channeled inner ring were lubricated through the inner ring, while bearings with a channeled outer ring were lubricated with oil jets.
	www.ebearing.com /industrylinks.htm (0 words)

	Magnetic-Bearing Momentum Wheel, AMSAT Phase 3-D Satellite
		The permanent magnets produce the main part of the magnetic flux in the magnetic circuit and the electromagnetic coils modulate this static bias flux, allowing the control of restoring forces on the wheel to keep it centered.
		The permanent magnets are situated between the fluxplates in a sandwich arrangement with a non-magnetic mounting structure.
		The magnetic bearing coils were designed for high efficiency and thus their time constant is long compared to the characteristic frequency omega_o of the loop.
	www.amsat.org /amsat/sats/phase3d/wheels/index.html (3181 words)

	Magnetic bearing using displacement winding techniques patent invention
		Controllable axial bearing force is developed through the differential balance of the currents in the circuits, while required motor torque is generated by the sum of the individual currents in a given phase.
		Tooth type motors with permanent magnet rotors exhibit a strong pull to a preferred axial position due to the sharp decrease in magnetic circuit reluctance as rotor magnets and back iron become axially aligned.
		Due to the large magnetic gap and sufficiently thick radial band of back iron, toothless motors are quite immune to magnetic saturation, however; the removal of heat generated within the winding throughout such peak demands requires significant design consideration.
	www.freshpatents.com /Magnetic-bearing-using-displacement-winding-techniques-dt20051201ptan20050264119.php (0 words)

	Magnetic Bearing, Magnetic Bearings, Magnetic Couplings
		A magnetic bearing consists of two concentric ring shaped permanent magnets (rotor and stator).
		Magnetic coupling consists of two magnets, a drive magnet that is attached to the motor shaft and a driven magnet that is completely sealed within the pump head and is connected to the driving gear.
		The magnets can be recoupled by bringing the motor to a complete stop, then eliminating the cause of the decoupling and restarting.
	www.cy-magnetics.com /Mag_Bearings.htm (0 words)

	Real-Time Control of Magnetic Bearings Using RTLinux (Site not responding. Last check: )
		The major advantage is magnetic bearings eliminate physical contact between the shaft and the support, minimizing friction and eliminating the wear inherent to conventional roller bearings.
		In this case, the quantity is the gap between the rotating bearing and the magnetic poles of the bearing.
		In my magnetic bearing test setup, y is the voltage driving the power amplifier, and x is the signal from the gap sensor.
	www.linuxjournal.com /node/8029/print (0 words)

	Touchdown Ball-Bearing System for Magnetic Bearings
		The torque-limited touchdown bearing system (TLTBS) is a backup mechanical-bearing system for a high-speed rotary machine in which the rotor shaft is supported by magnetic bearings in steady-state normal operation.
		The clearance between drive cones is small enough that if the magnetic bearing fails or if an excessive side load occurs, the ball-bearing assembly can provide full support, preventing damage to the magnetic suspension and making it possible to continue (at least temporarily) operation of the machine.
		Because the stator drive cone does not rotate and the rotor drive cone rotates at high speed during normal operation of the magnetic bearing, it is necessary to accommodate, and prevent frictional damage by, the slip that occurs between the two drive cones at the time of initial contact.
	www.nasatech.com /Briefs/Apr03/LEW17282.html (0 words)

	MBC500 magnetic bearing experiment from Magnetic Moments
		The MBC500 magnetic bearing experiment from Magnetic Moments consists of two active radial magnetic bearings and a supported shaft mounted on top of an anodized aluminum case.
		The shaft of the device is actively positioned in the radial directions at the shaft ends (4 degrees of freedom), it is passively centered in the axial direction, and it freely rotates about its axis.
		bearing axis, and four internal lead-lag compensators that independently control the radial bearing axes.
	www.launchpnt.com /mag_bearing.htm (0 words)

	Magnetic Bearings
		Develop a controller using active magnetic bearing in the cutting process to achieve high metal removal rates free from chatter.
		The magnetic bearing control must be tuned for the particular parameters of the cutting condition as well as the delay.
		The objective of this research is to develop a high-performance method of rotor position estimation using the magnetic actuator itself, without the use of discrete position sensors.
	www.virginia.edu /romac/magnetic_bearings.htm (0 words)

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