Abstract:
A magnetic drive has a prime mover, having a first magnet array on a first surface thereof, and a rotor, having a second magnet array on an outer surface thereof. The outer surface of the rotor is located adjacent to the first surface of the prime mover such that movement of the prime mover causes rotation of the rotor about an axis of rotation. A support member has a shaft for defining the axis of rotation of the rotor, and having a third magnet array, and the third magnet array cooperates with a fourth magnet array on the rotor to form a magnetic bearing to resist forces on the rotor acting along the axis of rotation thereof.
Abstract:
The invention relates to a bearing arrangement for a touch-free magnetic axial bearing (1), comprising a rotor/stator pair (2, 3) which can be rotated relative to each other on a common rotational axis (6), wherein magnets are provided both on the rotor side and on the stator side, which create a magnetic field bearing acting towards the axial direction, and a definite gap is present between the rotor (2) and stator (3), so that the rotor (2) and stator (3) do not touch each other, wherein on the side of the rotor (2) and on the side of the stator (3) permanent magnets (4) which are opposite to each other are arranged, the stator-side polarity is directed contrary to the rotor-side polarity, and on the side of the stator (3) at least one control and/or adjustable electromagnet having a coil (5) is arranged, which is opposite to a metal surface on the side of the rotor (2), which serves as a magnet yolk. Further, the invention relates to an X-ray tube (8) having a vacuum housing (9) and a rotary anode localized in the vacuum housing (9), which has at least one magnetic axial bearing (1) of the above-mentioned embodiment for the rotary anode.
Abstract:
A pseudo-Ievitation permanent magnet repulsive bearing and drive system arrangement for a large diameter, hollow centre composite flywheel for multi megawatt hours energy storage. The magnets are positioned in a frustrated cone to assist in centralising the running axis. The levitation system functions utilising multiple concentric rings of prime numbers of repulsive permanent magnets. Diaphragms, which deflect vertically and radially in concert with the flywheel as it speeds up, transmit torque between the flywheel and its drive system via a central drive shaft which rotates within active magnetic bearings or other bearing types. The lower fixed magnet arrays are elongated such that the cylindrical rotating magnets do not overhang at either end of the fixed magnet as the flywheel expands due to centrifugal force.
Abstract:
A device (2) for stirring a liquid or a granular material comprising a stirring agitator (4), a rotating drive shaft (12) for rotating the stirring agitator (4), a stationary axle (20) extending in an essentially vertical direction about which the stirring agitator (4) is adapted to rotate, and a transfer arrangement (16) for contactless transfer of rotation of the drive shaft (12) to the stirring agitator (4). The device (2) has a centre axis (19) around which the stirring agitator (4) and the drive shaft (12) are adapted to rotate, and means (24) for generating a magnetic force exerting an upwardly directed force component on the stirring agitator (4). The means (24) for generating a magnetic force comprises a first element (26) arranged in the stirring agitator (4) and a second element (28) associated with the stationary axle (20). At least one of the first element (26) and the second element (28) comprises a permanent magnet. At least one of the first element (26) and the second element (28) is arranged such that the centre axis (19) extends through the first element (26) and/or the second element (28).
Abstract:
The present invention relates to a rim driven propeller unit for a vessel, where a number of permanent magnets (4) are arranged round the propeller unit's rotatable rotor housing (1), comprising a number of propeller blades (3), and a number of permanent magnets round the propeller unit's external, stationary casing (2) housing the rotatable rotor housing, where the permanent magnets round parts of the rotatable rotor housing and the external, stationary casing's circumference are provided located above one another with like polarity, while other parts of the rotatable rotor housing and the external, stationary casing are provided located facing one another with opposite polarity, whereby the rotor housing and the stationary casing are repelled by and attracted to one another respectively, thereby being prevented from coming into contact with one another.
Abstract:
Der Erfindung liegt die Aufgabe zugrunde, eine Lageranordnung sowie ein Verfahren vorzuschlagen, welche einen gleichmäßigen Lauf bei der Lagerung von Lagerpartnern gewährleisten. Hierzu wird eine Lageranordnung (1) mit zwei Lagerpartnern (2, 3), mit einem Wälzlagerabschnitt (6) und mit einem Magnetlagerabschnitt (7) vorgeschlagen, wobei der Magnetlagerabschnitt (7) einen ersten und einen zweiten Magnetbereich (8, 9) aufweist, die durch einen Zwischenspalt (10) voneinander getrennt sind, wobei der Wälzlagerabschnitt (6) und der Magnetlagerabschnitt (7) gemeinsam die zwei Lagerpartner (2, 3) bewegbar zueinander lagern, und mit einem Aktor (12), der zur Steuerung und/oder Regelung des Zwischenspalts (10) ausgebildet ist.
Abstract:
A thrust-stabilised magnetic levitation ultracentrifuge comprises a magnetic levitation homopolar motor formed by a lower cylindrical magnet (1) that carries two parallel bismuth or graphite cylinders (2) with a rotor (3) located in a vacuum therebetween and comprising a lower electrically insulating disk (4) and two parallel cylindrical magnets (5 and 6) made of NbFeB (neodymium, iron and boron) or AlNiCo (aluminium, nickel and cobalt) interconnected by a hollow steel cylinder (7), the inside of which is in communication with the outside through a central vertical channel (8) located inside the upper magnet, and through which the sample to be centrifuged is injected and withdrawn, rotation being caused by the influence of the magnetic field on the electric current (9) that flows through the mercury or gallium (10) that fills the inside of the upper metal recipient (11) up to the positive pole (12) attached to the metal frame (13). The present invention is applicable in the fields of centrifuges and ultracentrifuges for industrial or domestic use.
Abstract:
Upon operation, flywheel assemblies sand other such rotational mechanisms are released by mechanical backup bearings, which then normally remain disengaged until shutdown as the flywheel assembly is levitated by the axial magnetic field. However, either due to over heating of bearings, power failure or other stimuli, flywheels often suffer a phenomenon deemed as touchdown down from the levitation state. During this touchdown event, flywheels inherently lose rotational momentum, thus ceasing to generate and release power and often cause damage to components as well as casing. Enhancements developed herein, through the introduction of the instant secondary hybrid touchdown bearing system, allow flywheels and other such systems to retain rotational momentum and continue generation of energy. Further, the instant system negates damage to system components, as well as bearing wear.
Abstract:
A wind driven generator using magnetic suspension is disclosed. It includes a frame, a mechanical bearing (3), a shaft (2) and a windmill (1), the shaft is horizontal, the windmill is placed at the front of the shaft, the shaft connects with the frame by the mechanical bearing, a magnetic suspension mechanism is set between the windmill and the mechanical bearing, the magnetic suspension mechanism includes magnets positioned at the shaft and the frame around an axial, and position offset between the corresponding magnets can produce magnetic force upwards for counteracting the weight. The wind driven generator has the advantages of simple structure, lower wind speed and high power.