7248 results about "Magnetic levitation" patented technology

The invention provides a simple method, devices and several machines for simultaneously stirring and aerating thousands of vessels or wells of microplates in a robust manner and with economy. This method uses the simple principle of magnetic stirrers being levitated vertically when passed laterally or vertically through a strong horizontal dipole magnetic field. The dipole magnetic fields may be produced by using permanent magnets, electromagnets or a modulating/reversing electro-magnetic field. Each vessel contains a magnetic ball, disc, bar, dowel or other shape (stirrers) which in their magnetic attraction to the dipole magnetic field will cause the stirrers to levitate up in the vessel as the stirrer's magnetic poles attempt to align with the center of the dipole's magnetic field. The stirrers will fall to the bottom of the vessel by gravity or by changing the relative position of the levitating magnetic field to pull them down, or by passing the vessel laterally over another magnetic field. The up and down movement of the stirrers provides a vigorous mixing of the contents of many vessels at same time. If the level of the vessel's meniscus is situated so the stirrers pass through it on their way up and down, the air/liquid interface is significantly increased thereby significantly increasing aeration of the liquid.

An apparatus and method for a centrifugal fluid pump for pumping sensitive biological fluids, which includes (i) an integral impeller and rotor which is entirely supported by an integral combination of permanent magnets and electromagnetic bearings and rotated by an integral motor, (ii) a pump housing and arcuate passages for fluid flow and containment, (iii) a brushless driving motor embedded and integral with the pump housing, (iv) a power supply, and (v) specific electronic sensing of impeller position, velocity or acceleration using a self-sensing method and physiological control algorithm for motor speed and pump performance based upon input from the electromagnetic bearing currents and motor back emf-all fitly joined together to provide efficient, durable and low maintenance pump operation. A specially designed impeller and pump housing provide the mechanism for transport and delivery of fluid through the pump to a pump output port with reduced fluid turbulence.

Magnetic levitation methods and apparatus use arrays of vehicle magnets to provide three forces: suspension, guidance and propulsion. The magnets, which can be permanent magnets or superconducting magnets operating in the persistent current mode, have associated control coils that allow the magnets to provide a controllable attractive force to a laminated steel rail. The control coils adjust the gap between the magnets and the rails so as to be in stable equilibrium without requiring significant power dissipation in the control coils. These same magnets and steel rails also provide lateral guidance to keep the vehicle on the track and steer the vehicle on turns. The suspension control coils can provide lateral damping by means of offset magnets in the suspension arrays. Windings in transverse slots in the steel rails are excited with currents that react against the field produced by the vehicle magnets to create vehicle propulsion. The magnet size is adjusted to provide negligible cogging force even when there are as few as three winding slots per wavelength along the rail. Means are used to mitigate end effects so that a multiplicity of magnet pods can be used to support the vehicle.

A method and apparatus for rapid thermal annealing comprising a plurality of lamps affixed to a lid of the chamber that provide at least one wavelength of light, a laser source extending into the chamber, a substrate support positioned within a base of the chamber, an edge ring affixed to the substrate support, and a gas distribution assembly in communication with the lid and the base of the chamber. A method and apparatus for rapid thermal annealing comprising a plurality of lamps comprising regional control of the lamps and a cooling gas distribution system affixed to a lid of the chamber, a heated substrate support with magnetic levitation extending through a base of the chamber, an edge ring affixed to the substrate support, and a gas distribution assembly in communication with the lid and the base of the chamber.

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.

Magnetic levitation technology is incorporated in a toothbrush to supply power useable to power movable cleaning elements, emit light or sound and other functions. Power is generated by merely shaking the toothbrush.

A low friction and stable sliding structure for an electronic device. The sliding structure includes a first sliding member comprising at least one guide portion, a second sliding member including a receiving portion receiving the guide portion so as to slide along the first sliding member, a first magnet portion disposed in the guide portion, such that magnetic poles of the first magnet portion are arranged across a sliding direction, and a second magnet portion disposed in the receiving portion so that a repulsive force can act between the first magnet portion and the second magnet portion.

A magnetic levitation motor including a stator having magnetic bearing units and a motor unit, and a rotor provided to the stator. And the occurrence of an eddy current at a magnetic bearing is suppressed and the rotation loss of the rotor can be reduced, and also to provide a pump using such the magnetic levitation motor.

The invention belongs to the field of rail traffic and relates to a U-shaped rail double-safety running and levitation driving energy-saving mechanism which is suitable for low-medium-speed maglev train double-safety running and levitation driving energy saving. The mechanism is composed of a U-shaped rail 1, a self-locking hydraulic traveling wheel mechanism 2, a connecting frame 3, a train body 4, an air spring 5, a bogie arm 6, a spindle 7, an aluminum sensing plate 8 and levitation magnets 9. By designing a U-shaped rail structure, production efficiency of the U-shaped rail is improved, roller consumption in hot rolling production is reduced, and production cost is lowered. By combining the U-shaped rail structure with the self-locking hydraulic traveling wheel mechanism, a maglev train is enabled to have a magnetic levitation and rubber wheel double-safety running mechanism, levitation-starting energy consumption of the maglev train is reduced remarkably, traction levitation energy consumption is reduced by 10-15%, and energy-saving effect is obvious. Running safety and accident emergency response capability are improved remarkably, and when a full-levitation system is in a failure, driven by a linear motor, a rubber wheel supporting train still can safely get to a target station.

This invention discloses a haptic interface system that uses Lorentz forces to provide magnetic levitation for a handle which can be manipulated by a person, typically a computer user.

The invention provides a low-speed high-precision control system of a magnetically levitated flywheel motor based on n Hall transducers, which is used in the high-precision stance control executing mechanism of the new-generation high-stability satellite, namely, the drive control of the magnetically levitated reaction flywheel motor. The invention mainly comprises a controller taking the field programmable gate array (FPGA) as a core, a Hall transducer, a three-phase bridge power amplifier, a drive circuit of the power amplifier, a three-phase permanent magnet brushless DC motor, a voltage reducing chopper, an energy dissipation unit, a detecting unit of a winding current, a detecting unit of chopping voltage, and a DC constant power supply. By arranging n Hall transducers evenly on one side of the motor stator and detecting the Hall signals produced by the Hall transducers, precise rotation speed feedback can be obtained after the Hall signals are compensated, and the low-speed high-precision control of the magnetically levitated reaction flywheel used permanent magnet brushless DC motor can be implemented by using the controller taking the FPGA as the core.

An unbalance identification and vibration suppression control system for a magnetic suspension rotating machinery comprises an unbalance identification module, an unbalanced force compensation module, a magnetic bearing power amplifier, an electromagnet rotor and a displacement sensor. Based on stable control of a magnetic suspension rotor, the unbalance of a magnetic bearing is identified in an online manner by a novel wave trap based on coordinate transformation, on one hand, the identification amount is used for compensating common-frequency current stiffness force, on the other hand, proper common-frequency current stiffness force is generated according to the identification amount to compensate common-frequency displacement stiffness force, and the influence of the low-pass characteristic of the power amplifier on compensation precision of the common-frequency displacement stiffness force is eliminated by leading a simplified inverse model of the magnetic bearing power amplifier into a feed-forward channel. When the magnetic suspension rotor rotates at a high speed, common-frequency bearing force is greatly reduced, and unbalanced vibration of the magnetic suspension rotor is remarkably suppressed. The unbalance identification and vibration suppression control system is simple, convenient, easy and particularly suitable for an actual high-speed magnetic suspension rotor system.

The present invention relates to a magnetic suspension reaction flywheel open-loop high-accuracy unbalanced vibration control system. It includes the following several portions: displacement sensor, displacement signal interface circuit, rotating speed detection device, magnetic bearing controller, magnetic bearing power amplification drive circuit and flywheel position identification device. The magnetic bearing controller includes axial bearing controller and radial bearing controller, the radial bearing controller is formed from two portions of stabilization controller and unbalanced vibration controller, in which the unbalanced vibration controller can be used for making compensation for displacement feedback of stabilization controller.

A High Temperature Superconductor Maglev (HTSM) for Evacuated Tube Transport (ETT) with a magnetic levitation structure for ETT capsule vehicles traveling in an evacuated tube. At least one ETT capsule travels within an evacuated tube, an upper and a lower cryostat respectively mount at the top and bottom of said ETT capsule along the length thereof, at least a plurality of superconductor levitation force elements divided between said upper and lower cryostats. The levitation force being spread over the length of capsule, however substantially concentrated in a compact cross-sectional area. At least a pair of permanent magnetic elements mounted at the top and bottom of the evacuated tube to levitate the capsule. At least a pair of capsule based switchable diverge force elements cooperate with at least a pair of tube based diverge force elements to steer the capsule while in an interchange.

The invention provides a mask aligner mask platform adopting the magnetic suspension technology. The mask aligner mask platform mainly comprises a precision slideway, a base, a suspension and the like, wherein the inside of the suspension is provided with an electromagnet which combines with a vortex displacement sensor to realize that the suspension is suspended above the slideway stably; the stator of a linear electric motor is fixed on the base, the rotor of the linear electric motor is fixed on the suspension; and the slideway surface is provided with a linear scale which combines with a linear scale reading-head arranged on the suspension to realize the precise and linear positioning motion of the suspension. The magnetic suspension mask aligner mask platform provided by the invention utilizes electromagnetic attraction and electromagnetic linear drive to ensure that the mask aligner mask platform can perform precise and fast reciprocating linear positioning motion, realize the functions of ultra-clean, high-speed, long-distance and precise positioning motion and the like which can not be realized by using the traditional scheme using a rotary servo motor for drive, a precision ball lead screw for transmission and a slideguide for support, and have higher suspension stiffness and better load-bearing characteristic than the gas phase suspension mask aligner mask platform.

A magnetic levitation flywheel high-precision active vibration control system comprises a displacement sensor, a current sensor, a magnetic bearing controller and a PWM modulation and a power amplifier, wherein, the magnetic bearing controller comprises stabilization of the controller, eccentric estimation, magnetic force compensation and action of a switch. The magnetic levitation flywheel high-precision active vibration control system introduces the eccentric estimation and the magnetic force compensation on the basis of the stable control and utilizes the unbalance vibration parameters of a flywheel to carry out the compensation of the unbalance amount and the displacement negative stiffness of the flywheel within the entire rotation speed range, thus realizing the control of the unbalance vibration of the flywheel within the entire rotation speed range and allowing the flywheel to be operated around a principal axis of inertia with high precision during the whole process of speed increasing and speed reducing.

A substrate holding and rotating device includes: a turntable rotatable; a rotative drive unit which rotates the turntable; a holding member which is provided on the turntable and horizontally holds a substrate in upwardly spaced relation to the turntable; a vertically movable protection disk disposed between the turntable and a substrate holding position; and a magnetic levitation mechanism including a first magnet attached to the protection disk, an annular second magnet which generates a repulsive force with respect to the first magnet, a support member which non-rotatably supports the second magnet, and a relative movement mechanism which moves the support member and the turntable relative to each other.

Provided is a bearingless motor capable of stably performing magnetic levitation and rotation even when a thrust disk is not provided and gap length is wide.

A unit 101 of a first bearingless motor is formed of a stator 41 and a core 61, while a unit 103 of a second bearingless motor is formed of a stator 43 and a core 63. A thrust magnetic bearing unit 102 formed of a core 62 and a stator 42 while having the functions of a thrust magnetic bearing is newly arranged between the unit 101 and the unit 103. A stator-side annular thrust permanent magnet 73 and a rotor-side annular thrust permanent magnet 81 are arranged between the unit 101 and the unit 103, while a stator-side annular thrust permanent magnet 75 and a rotor-side annular thrust permanent magnet 83 are arranged between the unit 102 and the unit 103.

Disclosed a high speed magnetic levitation flywheel stability control system, comprises a displacement sensor, a displacement signal interface circuit, a rotary speed detect circuit, a magnetic bearing controller, and a magnetic bearing power amplifying drive circuit. Wherein, the magnetic bearing controller comprises a axial magnetic bearing controller and a radial magnetic bearing controller, while the radial one is formed by decentralized PID control module and a cross feedback control module whose outputs are connected by the feedback method in cross and parallel. Said invention utilizes the cross feedback control formed by forward whirling motion filter and backward whirling motion filter based on the decentralized PID control; it reaches the phase lead compensation to the forward and backward whirling motion by using the difference of their frequency and whirling motion directions, their variation rule of rotary speed, and the signal of rotary speed of flywheel. So the breakdown speed of flywheel is improved while the stable operation of magnetic levitation flywheel in whole rising and falling process is confirmed too.

The present invention relates to a novel magnetic suspension and propulsion technologies, which are named as Magnetostatic Suspension (MSS) and Magnetostatic Propulsion (MSP) respectively because of their magnetostatic nature of forces generated. A spring-like magnetic force is produced through interactions between magnets and ferrous materials such as steel. To apply the technologies, four key embodiments of the invention have been invented and described: a MSS and MSP maglev vehicle system in which a vehicle body is lifted up and stabilized by magnetostatic forces above a steel rail both horizontally and vertically; a MSP long-stator linear motor system in which a rotor can be driven up along a magnet-free steel rail or long steel stator; a MSS Permanent Magnet Magnetic Bearing System (PMMB) system in which a steel shaft is levitated standstill by a fully permanent magnets assembly for frictionless rotating; a MSS maglev wind turbine system in which a magnet-free turbine body can hover standstill over a permanent magnet base assembly spinning frictionlessly with low inertia and low cut-in wind speed threshold.

This structure and method for minimizing EME (Electromagnetic Emission) and the crosstalk between the signal lines which are used to write and read the tracks of magnetic disk drives. These signal lines are located on magnetic trace suspension assemblies which move above the magnetic disk drives. The structure and method utilize well-placed single and multiple crossovers on either or both of the lines used to read and write the tracks on magnetic disks. In addition, the structure and method utilize the parasitic capacitances between the write and read lines to couple beneficial voltages which cancel the unwanted crosstalk noise.