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870results about "Bearing load relief" patented technology
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Wind turbine
InactiveUS7042109B2Improve efficiencyCost per unit power generationWindingsWind motor controlRotational energyAir core
A wind turbine for generating electrical power from wind energy includes a turbine rotor mounted for rotation in wind, and having multiple blades for converting energy in the wind into rotational energy. A generator is coupled with said turbine rotor such that said turbine rotor drives said generator. The generator has a stationary air core armature that is located in a magnetic airgap between two generator rotor portions. The generator rotor portions have circumferential arrays of multiple alternating polarity permanent magnets attached to ferromagnetic back irons such that the permanent magnets drive magnetic flux back and forth between each rotor portion and through the stationary air core armature. The stationary air core armature has multiple phase windings of multiple individually insulated strand conductor wire that is wound with two separate portions including an active length portion and an end turn portion. The end turn portion is located outside the magnetic airgap and traverses predominately circumferentially, and the active length portion is located in the magnetic airgap and traverses predominately non-circumferentially and perpendicular to the direction of the magnetic airgap. The end turn portion has a thickness that is greater than the thickness of said active length portion in the direction of said magnetic airgap. AC voltage is induced in the multiple phase windings as the turbine rotor rotates.
Owner:MARIAH POWER
Sealless rotary blood pump
InactiveUS7575423B2Minimize the possibilityShortening its residence timePump componentsMedical devicesImpellerThrust bearing
A rotary blood pump is provided which includes a pump housing and a rotor mounted for rotation with the housing. The rotor has an impeller. A rotor motor is provided including a plurality of permanent magnets carried by the impeller. A first motor stator is positioned on one side of the impeller and a second motor stator is positioned on an opposite side of the impeller. The motor stators each include a plurality of electrically conductive coils and pole pieces located within the housing. A plurality of wedge-shaped hydrodynamic thrust bearings are located outside of the axis of the rotor. During rotation of the impeller, the hydrodynamic bearings are separated from the housing by a fluid film and are not in direct mechanical contact with the housing.
Owner:THORATEC CORPORTION
Permanent magnetically excited electrical rotary drive
InactiveUS6278251B1Improve fault toleranceGuaranteed uptimeSynchronous motors startersAC motor controlPhase currentsElectricity
A permanent magnetically excited electrical rotary drive for a blood pump is proposed, comprising a permanent magnetic rotor and a stator, said stator comprising a drive winding having at least two loops for the production of a magnetic drive field which produces a torque on the rotor, with each loop belonging to a different electrical phase, furthermore comprising a setting device which supplies each loop in each case with a phase current or in each case with a phase voltage as a setting parameter, with the setting device comprising a separate power amplifier for each loop so that the setting parameter for each loop can be regulated independently of the setting parameter for the other loops.
Owner:THORATEC CORPORTION
Exposure apparatus, movable body apparatus, flat-panel display manufacturing method, and device manufacturing method
In a substrate stage, when a Y coarse movement stage moves in the Y-axis direction, an X coarse movement stage, a weight cancellation device, and an X guide move integrally in the Y-axis direction with the Y coarse movement stage, and when the X coarse movement stage moves in the X-axis direction on the Y coarse movement stage, the weight cancellation device moves on the X guide in the X-axis direction integrally with the X coarse movement stage. Because the X guide is provided extending in the X-axis direction while covering the movement range of the weight cancellation device in the X-axis direction, the weight cancellation device is constantly supported by the X guide, regardless of its position. Accordingly, a substrate can be guided along the XY plane with good accuracy, even if a member (for example, a surface plate and the like) that has a guide surface large enough to cover the total movement range of the weight cancellation device is not provided.
Owner:NIKON CORP
Method and apparatus for providing three axis magnetic bearing having permanent magnets mounted on radial pole stack
InactiveUS6727617B2Effective and inexpensive techniqueHighly linear magnetic biasMechanical energy handlingBearingsAxial displacementAudio power amplifier
An improved magnetic bearing that uses permanent magnets to provide the bias flux. The magnetic circuits generating the control flux and bias fluxes are substantially non-coincident but share the same path over some portions that include radial and axial airgaps allowing for a low reluctance and an efficient path for the electromagnetic flux. The flux paths of the permanent magnets are completely defined with minimized airgaps for achieving higher forces and efficiency and very low control currents that produce extremely large forces. A single coil and amplifier for the axial force control and two coils with one associated amplifier for each radial axis of control provides simplicity and cost effectiveness. A single thrust disk is provided that is reacted against for both radial and the axial displacement. The permanent magnets used in the present invention are first fabricated and axially magnetized as segments or as continuous rings prior to being mounted on the sides of the rotor pole, providing an effective and inexpensive technique of manufacturing magnetic bearings.
Owner:CALNETIX TECH +1
Magnetic levitation sliding structure
InactiveUS20080139261A1Facilitate movement of firstEasy to moveElectromagnets without armaturesLinear bearingsElectronic equipmentMagnetic levitation
A magnetic levitation sliding structure is provided. The sliding structure includes a first slider member including a guide portion with a first magnet, a second slider member including a receiving portion with a channel-shaped second magnet, the receiving portion being configured to receive the guide portion so as to slide on the first slider member. The first and second magnets are configured so that a repelling force can act there between for facilitating the sliding operation. In some embodiments the sliding structure includes at least one attraction member configured at an initial and / or final position of one of the first and second slider members. A portable electronic device including the magnetic levitation sliding structure is also provided.
Owner:SAMSUNG TECHWIN CO LTD
Integrated magnetic bearing
Owner:AIREX CORP
Pump with an electrodynamically supported impeller and a hydrodynamic bearing between the impeller and the stator
A pump includes an impeller, a stator, and a plurality of magnets forming bearing poles coupled to a selected one of the stator or the impeller. The pump further includes a plurality of shorted coils coupled to the other of the stator and the impeller. The plurality of bearing poles and shorted coils co-operate to form an electrodynamic bearing during rotation of the impeller. The electrodynamic bearing supports the impeller either axially or radially during operation of the pump. Hydrodynamic bearing surfaces are provided for generating a hydrodynamic bearing between the impeller and stator. The plurality of magnets may comprise a plurality of distinct magnetic elements or a single element comprising a plurality of distinct magnetic domains. The plurality of distinct magnetic elements or domains may be arranged to form a Halbach array.
Owner:DAVIS WILLIAM D +1
Stator field providing torque and levitation
InactiveUS6879074B2Easy constructionSimple electrical controlShaftsMechanical energy handlingMagnetomotive forceLevitation
The invention relates to an economical, non-wearing, electrical permanent magnet drive for actively controlling the rotor position in three degree of freedom. The stator windings produce superimposed fields with different pole numbers in the pole pitches by unsymmetrical magnetomotive force distributions.
Owner:LEVITRONIX TECH +1
Magnetic bearing
There is disclosed a magnetic bearing which is an improvement over conventional radial magnetic bearings, and has a very small bearing loss. At least three U-shaped laminates 10 of electromagnetic steel sheets are circumferentially arranged around a rotation shaft 1, and are fixedly mounted on a housing 100. Exciting coils 31 and 32 are wound on each electromagnetic steel sheet laminate 10, and permanent magnets 20 and 21 are provided in the laminate 10. Rotor cores 2, each comprising a laminate of I-shaped electromagnetic steel sheets stacked together in the circumferential direction, are mounted on the rotation shaft 1 in such a manner that each rotor core 2 is opposed to magnetic pole surfaces of the electromagnetic steel sheet laminates 10. In accordance with a signal from position sensors 5 which detect the radial position of the rotation shaft 1, control current is caused to flow through the exciting coils 31 and 32 to thereby control the position of the rotation shaft 1. Thus, merely by causing the control current to flow through the exciting coils 31 and 32 when this is required, the control of the rotation shaft 1 can be achieved, and with this method, the energy consumption can be much reduced.
Owner:NSK LTD
System and method to control a rotary-linear actuator
A system and method are disclosed for controlling an integrated rotary-linear actuator system that may be coupled to a network via a network interface. The integrated rotary-linear actuator system includes a control system and a rotary-linear actuator having a moveable plunger and associated coils. The coils may be energized to interact with associated magnets to effect corresponding movement of the plunger, which may include rotation and / or linear movement. The network interface facilitates receipt of control information at the control system of the integrated rotary-linear actuator system from the network. The control system may control an amplifier to energize the coils based on the control information.
Owner:ANORAD
System using a levitating, rotating pumping or mixing element and related methods
InactiveUS7086778B2Eliminate deleterious thermal transferPrecise positioningShaking/oscillating/vibrating mixersFlow mixersLevitationEngineering
A system for pumping or mixing a fluid using a levitating, rotating pumping or mixing element and various other components for use in a pumping or mixing system are disclosed. The pumping or mixing element is placed in a fluid-containing vessel in close proximity to a superconducting element. A cooling source thermally linked to the superconducting element provides the necessary cooling to induce levitation in the pumping or mixing element. The superconducting element may be thermally isolated, such that the pumping or mixing element, the vessel, and any fluid contained therein are not exposed to the cold temperatures required to produce the desired superconductive effects and the resulting levitation. By using means external to the vessel to rotate and / or stabilize the pumping or mixing element levitating in the fluid, including possibly rotating the superconducting element itself or moving it relative to the vessel, the desired effective pumping or mixing action may be provided.
Owner:PALL TECH UK
Method and apparatus for providing three axis magnetic bearing having permanent magnets mounted on radial pole stack
InactiveUS20030155829A1Effective and inexpensive techniqueHighly linear magnetic biasMechanical energy handlingBearingsAxial displacementMagnetic bearing
An improved magnetic bearing that uses permanent magnets to provide the bias flux. The magnetic circuits generating the control flux and bias fluxes are substantially non-coincident but share the same path over some portions that include radial and axial airgaps allowing for a low reluctance and an efficient path for the electromagnetic flux. The flux paths of the permanent magnets are completely defined with minimized airgaps for achieving higher forces and efficiency and very low control currents that produce extremely large forces. A single coil and amplifier for the axial force control and two coils with one associated amplifier for each radial axis of control provides simplicity and cost effectiveness. A single thrust disk is provided that is reacted against for both radial and the axial displacement. The permanent magnets used in the present invention are first fabricated and axially magnetized as segments or as continuous rings prior to being mounted on the sides of the rotor pole, providing an effective and inexpensive technique of manufacturing magnetic bearings.
Owner:CALNETIX TECH +1
Energy conversion systems and methods
An energy conversion system may include a stationary structure, a rotatable structure configured to rotate relative to the stationary structure, wherein the rotatable structure defines an axis of rotation. The system may further include at least one blade member mounted to and extending radially outward from the rotatable structure, the at least one blade member being configured to interact with fluid currents flowing in a direction substantially parallel to the axis of rotation to cause the rotatable structure to rotate about the axis of rotation, and at least one bearing mechanism disposed to provide at least one of a radial and axial bearing between the rotatable structure and the stationary structure as the rotatable structure rotates about the stationary structure. The system may be configured to convert rotation of the rotatable structure to at least one of electricity and hydrogen production.
Owner:OCEANA ENERGY
Method for controlling the position of a permanent magnetically supported rotating component
InactiveUS7229474B2Reduce dissipationProduced heat energyPump componentsHeart stimulatorsPulsatile flowHigh voltage
Since disruptive forces can be continuously exerted upon a rotor during a pulsatile flow through a pump with a magnetically mounted rotor (permanent magnets and addition control current coils), it is necessary to adjust position i.e. modify axial rotor position very quickly. The control current should only result in small amounts of losses. According to the invention, the current is pulse-width modulated by the control current coils by means of a set value predetermined by a controller which is arranged downstream from a position sensing system. If the set value is high, it is switched to a higher voltage level and the real value of the position sensing system is stored for a defined period of time, respectively beginning with the switching flank of the control current, and the position sensing system is disconnected during said period of time.
Owner:BERLIN HEART GMBH
Flywheel energy storage systems
InactiveUS20050040776A1Load minimizationProlong lifeElectrical storage systemDC motor speed/torque controlFlywheel energy storageThermal energy storage
Owner:KINETECH POWER CO LLC
System for actively reducing radial vibrations in a rotating shaft, and method of operating the system to achieve this
InactiveUS6138629AReduce vibrationReduce unevennessRotating vibration suppressionBraking element arrangementsDrive shaftEngineering
PCT No. PCT / DE96 / 01665 Sec. 371 Date Jul. 23, 1998 Sec. 102(e) Date Jul. 23, 1998 PCT Filed Aug. 31, 1996 PCT Pub. No. WO97 / 08477 PCT Pub. Date Mar. 6, 1997The invention concerns a system for active reduction of radial vibrations of a rotating shaft (4), especially the drive shaft of an internal combustion engine (1), with at least one active electromagnetic device (7; 10; 15, 16), which is configured and controlled such that it applies radial forces to the shaft (4), which counteract the radial vibrations of the shaft (4).
Owner:CONTINENTAL ISAD ELECTRONICS SYST GMBH & CO KG
Lithographic apparatus, device manufacturing method and device manufactured thereby
InactiveUS20050002008A1Low stiffnessMinimal effortBearing assemblyInvestigating moving sheetsMagnetic bearingEngineering
A lithographic projection apparatus includes a passive magnetic bearing configured to provide support between a first and second part of the lithographic apparatus and allow both parts to be displaced relative to each other in a direction perpendicular to the support direction. The passive magnetic bearing includes first and second magnetic assemblies. Each magnetic assembly includes at least one permanent magnet.
Owner:ASML NETHERLANDS BV
Low-Cost Minimal-Loss Flywheel Battery
InactiveUS20100283340A1Low-cost minimal-lossMinimize ball bearing radial thrustRolling contact bearingsControllers with pulse-train output signalBall bearingDc current
A low-cost minimal-loss zero-maintenance flywheel battery, to store electric power from a DC power source by conversion to kinetic energy, and regenerate electric power as needed. Its vertical spin-axis rotor assembly is supported axially by repelling annular permanent magnets, and is centered by ceramic ball bearings which have axial preload that prevents vibration and augments axial rotor support. A regenerative multi-pole permanent-magnet motor, controlled by its 2-phase stator current, and connected by power and signal conductors to power interface electronics, is integrated within the flywheel assembly, in a vacuum enclosure supported by a self-leveling structure. Sinusoidal 2-phase stator currents are controlled by high-frequency pulse-width-modulated H-bridge power electronics that draw and regenerate controlled DC current with minimal ripple, responsive to respective 2-phase rotation angle sensors, the DC power voltage, and other settings. The electronics includes logic and over-voltage protection to prevent otherwise possible damaging current and voltage.
Owner:FRADELLA RICHARD B
Spindle device and machine tool utilizing the same
A spindle device equipped with a combined externally pressurized gas-magnetic bearing assembly, and a machining apparatus utilizing the spindle device. The spindle device is capable of accomplishing a high speed rotation with high rotational precision and includes a main shaft (4) rotatably supported by the combined bearing assembly (6 to 9), an electric current detecting device (15 to 18) disposed in a spindle controller (3) for detecting a current supplied to electromagnets of the combined bearing assembly (6 to 9). Also provided is a machining status determining device (19) for determining the machining status in reference to the current detected by the current detecting device (15 to 18). The machining status may be an indication of the extent to which a machining tool is impaired.
Owner:NTN CORP
Magnetic levitation weight reduction structure for a vertical wind turbine generator
Owner:HU SUEY YUEH
Spindle motor including magnetic element for pre-loading a ball bearing set
A spindle motor for use in a disk drive includes a spindle motor base and a motor shaft. The motor shaft has a central axis. The spindle motor includes a spindle motor hub rotatably coupled to the spindle motor base, the spindle motor hub including a central magnetic metal portion disposed adjacent a distal end of the motor shaft. The spindle motor includes a ball bearing set disposed between and in mechanical communication with the spindle motor hub and the motor shaft for rotatably coupling the spindle motor hub to the spindle motor base. The spindle motor includes a shaft magnetic element attached to the motor shaft at the distal end adjacent the central magnetic metal portion, the shaft magnetic element being sized and configured to apply an attractive magnetic force to the central magnetic metal portion in a direction along the central axis for pre-loading the ball bearing set.
Owner:WESTERN DIGITAL TECH INC
Flywheel energy storage systems
InactiveUS6995529B2Load minimizationProlong lifeElectrical storage systemDC motor speed/torque controlFlywheel energy storageThermal energy storage
Owner:KINETECH POWER CO LLC
Homopolar machine with shaft axial thrust compensation for reduced thrust bearing wear and noise
InactiveUS6856062B2Reduce induced magnetic forceConstant contact pressureRotary current collectorMagnetic bodiesFiberContact pressure
A homopolar machine produces an axial counter force on the rotating shaft to compensate for the load on the shaft's thrust bearing to reduce wear and noise and prolong bearing life. The counter force is produced through magnetic interaction between the shaft and the machine's field coils and is created by changing the current excitation of the field coils, which results in a magnetic flux asymmetry in an inner flux return coupled to the shaft. The homopolar machine may also have a configuration that uses current collectors that maintain substantially constant contact pressure in the presence of high magnetic fields to improve current collector performance. The current collectors are flexible and may be made from either electrically conductive fibers or stacked strips such that they bear up against the armature so that the pressure is maintained by the spring constant of the current collector material. The homopolar machine may also have a configuration where the brushes are oriented so that the current is aligned as much as is practical with the local magnetic field lines so as to reduce the lateral electromagnetic forces on the brushes.
Owner:GENERAL ATOMICS
Foil bearing assembly
InactiveUS20150362012A1Reduce stiffnessConstant elastic member stiffnessRotary combination bearingsMagnetic bearingsEngineeringMechanical engineering
The bearing assembly comprises a radial foil bearing and an axial foil bearing, a control bearing preload device for controlling stiffness of the bearing under normal operating conditions, an electromagnetic unloading device for decreasing amplitude of rotor oscillations and an unloading means for increasing the ultimate bearing load without damaging bump foils. The radial foil bearing comprises a bushing 6 providing accommodating bearing misalignment with respect to the journal, an elastic member in the form of an elastic damping unit for increasing damping, which consists of a bump foil 20 and two smooth foils 16 and 22. The bump foils in the bearing have different heights and alternate in the axial direction to decrease wear under start / stop. A top foil 4 of the bearing is weldlessly retained within slots of mounting bars 70 and 80. The axial bearing has the bump foil with ridges circumferentially extended in order for the bearing to work in sealing mode. The top foils of the bearing are provided with circumferential slits in order to decrease thermal stress.
Owner:ERMILOV YURY IVANOVICH
Electric supercharger, assembling method of the same, and internal combustion engine
ActiveUS20140090626A1Reduce vibrationSuppress reduction in output of rotationPump componentsBall bearingsBall bearingExternal combustion engine
It is intended to implement an electric supercharger that has a simplified architecture, is easy to assemble, produces reduced vibration and noise, and has a motor inverter, making it possible to minimize losses in motor output and rotary-shaft output. The electric supercharger is provided with the following: an integrated housing with a built-in electric motor and motor inverter; and a ball bearing and damper-sleeve structure arranged on both sides of the electric motor. The damper-sleeve structure comprises a large-diameter sleeve, a spring guide, a coil spring, and a ball bearing. A gap is formed between the ball bearings and a sleeve and the large-diameter sleeve. The inner ring or outer ring of the ball bearings are supported by various support members disposed on both sides. An elastic O-ring that elastically supports the sleeve and large-diameter sleeve is provided on the outside of the sleeves.
Owner:MITSUBISHI HEAVY IND ENGINE & TURBOCHARGER LTD
Flywheel energy system
An energy storage system comprises a housing and a flywheel having a drive shaft portion attached to a cylindrical ferromagnetic rotor portion. The drive shaft portion defines a substantially vertical axis about which the rotor portion is mounted for rotation. A magnetic bearing assembly comprised of an annular permanent magnet having no electromagnetic components is mounted on the housing in stationary centered relation about the vertical axis above the rotor portion so as to attract the rotor portion axially upwardly towards a lower face of permanent magnet, thereby supporting a significantly high portion of the weight of the flywheel. At least one low friction mechanical bearing assembly is mounted within the housing about the drive shaft portion to provide radial positioning of the rotor portion and to limit at least upward axial movement of the rotor portion in relation to the lower face. The annular permanent magnet overlies a portion of the end face of the rotor with the balance providing a return path for magnetic flux.
Owner:BC NEW ENERGY (TIANJIN) CO LTD
Rotary pump with hydrodynamically suspended impeller
InactiveUS7156802B2Increase thrustReduce thrustPump componentsRotary piston pumpsImpellerRotary pump
This invention relates to rotary pumps adapted, but not exclusively, for use as artificial hearts or ventricular assist devices and, in particular, discloses in preferred forms a seal-less shaft-less pump featuring open or closed (shrouded) impeller blades with the edges of the blades used as hydrodynamic thrust bearings and with electromagnetic torque provided by the interaction between magnets embedded in the blades and a rotating current pattern generated in coils fixed relative to the pump housing.
Owner:TECH SYDNEY UNIV OF +2
Magnetic Levitation Weight Reduction Structure for a Vertical Wind Turbine Generator
InactiveUS20080174119A1Noise minimizationSimple structureMachines/enginesWind energy generationTurbineMagnetic levitation
A magnetic levitation weight reduction structure for a vertical wind turbine generator includes a frame, a fixed permanent magnet, an axle, a revolving permanent magnet, a blade hub, and a generator. The fixed permanent magnet fixed to the frame has a first repulsive surface. The axle is connected to the frame. The revolving permanent magnet fixed to the axle has a second repulsive surface in relation to the first repulsive surface of the fixed permanent magnet. Both the first and the second repulsive surfaces repel with each other. The blade hub and the generator are connected to the axle. When the revolving permanent magnet is rotated, the axle functions as a balance center.
Owner:HU SUEY YUEH
Drive apparatus
InactiveUS7024963B2Minimal heat lossIncrease its rotational inertiaMagnetic circuitGearingElectricityDrive shaft
An apparatus for inducing drive is shown that includes a primary drive shaft and four secondary drive shafts. The primary shaft and secondary shafts are fitted with magnets that are oriented such that when the primary shaft is rotated the secondary shafts are caused to rotate due to attractive or repulsive forces. The primary shaft is connected to and rotated by a rotational energy source such as a motor powered by electricity or a battery, although any source of energy to cause rotation of the primary shaft may be used. Each secondary shaft is fitted with two annular magnetic discs that are oriented to vertically support the weight of the shaft (and any attachments / fittings thereto) above the alternating or generating device. The discs can be arranged to provide either an attractive or repulsive magnetic force between them.
Owner:THE GABRIELLE BAKEY FAMILY TRUST
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