A pump device (10) includes a housing (30) including a blood inflow port (38) through which blood flows in, and having a fixed-side repulsive magnet (44) disposed in an annular manner; and an impeller (14) that is rotatably housed inside the housing (30), and having a movable-side repulsive magnet (56) disposed in an annular manner. The fixed-side repulsive magnet (44) is disposed in a position offset toward the blood inflow port (38) side relative to the movable-side repulsive magnet (56). In the fixed-side repulsive magnet (44) and the movable-side repulsive magnet (56), a fixed-side repulsive surface (44a) and a movable-side repulsive surface (56a) adjacent to each other have the same polarity.

A magnetic clutch assembly comprises circumferentially spaced coil units, a rotor, and an electrical control unit to controllably supply energizing current for inducing electromagnetic fields at each coil unit, to initiate rotation of the rotor. The rotor comprises a driving ring receivable within an interior of the coil units, a driven ring concentric to the driving ring and connectable with a mechanical load, pairs of permanent magnets consisting of a driving ring magnet and a driven ring magnet which is magnetically coupled to the driving ring magnet, and circumferentially spaced offset magnets provided with the driven ring whose magnetization direction is angularly offset to the magnetization direction of an adjacent driven ring magnet. Curving magnetic field lines of each offset magnet are superposed with the magnetic field lines of an adjacent driven ring magnet that are curving in a different direction to suppress generation of a parasitic back electromotive force.

A magnetic coupling rotor includes permanent magnets arranged at equal angular spacings about its axis of rotation, wherein they respectively face radially inwardly and radially outwardly with their pole faces, of which a respective one bears against a backiron body of ferromagnetic material. The backiron body is a cylindrical ring with smooth peripheral surfaces. Provided for the permanent magnets is a holding device comprising a not or only weakly magnetizable injection-moldable material in the form of a rotary-symmetrical body having recesses for receiving the permanent magnets. The diameters of the holding means and the backiron body are such that they can be fitted together coaxially such that the backiron body at least partially covers the recesses in a radial direction. Thus, formed between it and the holding means is an even number of insertion compartments into which permanent magnets may be inserted.

A double-stator rotating electric machine includes a rotor, an outer stator disposed radially outside the rotor with an outer gap formed therebetween, and an inner stator disposed radially inside the rotor with an inner gap formed therebetween. The outer stator has an outer multi-phase coil wound thereon, and the inner stator has an inner multi-phase coil wound thereon. Moreover, the inner gap formed between the inner stator and the rotor is set to be larger than the outer gap formed between the outer stator and the rotor.

A retarder includes a rotor, a plurality of fins, a plurality of permanent magnets, a switching mechanism, a first cover, a second cover, and a cover-switching mechanism. The fins are provided on an outer peripheral surface of the rotor and inclined with respect to a rotation direction of the rotor. The magnets are arranged inside the rotor. The first cover faces an end face of the rotor and includes a plurality of holes. The second cover protrudes from an outer circumferential edge of the first cover toward a rotor side. The cover-switching mechanism opens the holes in the braking state and closes the holes in the non-braking state. The first cover is disposed on a side on which a leading end portion of each fin is present. The retarder achieves suppressing windage and ensuring a heat dissipation performance.

The present disclosure relates to coupling assemblies for drive shaft assemblies. The coupling assembly comprises a first portion and a second portion which are configured to couple to one another such that the second portion is capable of rotationally driving the first portion about an axis of rotation. The first portion is provided with a first magnet and the second portion is provided with a second magnet. The first and second magnets are arranged to repel each other such that the first and second portions are biased away from each other in an axial direction that is parallel to the axis of rotation.

A wheel, a magnet-wheel system and a method including a wheel for a transport vehicle movable along a guideway in a transportation system. The transportation system includes a conductive surface arranged substantially parallel to the guideway. The wheel includes at least one magnet is affixed to at least one of an exterior of the wheel or an interior of the wheel. The wheel is rotatably drivable by drag forces created in the conductive surface, which is spatially separate from the wheel in transport.

A drive unit for an endless conveyor, comprising a magnetic transmission and an electric motor connected to an input shaft of the magnetic transmission, where the magnetic transmission comprises a rotatable outer cylinder comprising a plurality of permanent magnets arranged as magnetic poles at the inner side of the outer cylinder, an intermediate cylindrical element comprising a plurality of ferromagnetic pole pieces, an inner cylinder comprising a plurality of permanent magnets arranged as magnetic poles at the outer side of the inner cylinder, where the outer side of the outer cylinder is configured with a drive surface adapted to interact with a conveyor belt or conveyor chain. The advantage of the invention is that a compact and efficient drive unit for a conveyor system is provided, which is provided with a contactless predefined slip.

A centrifugal fluid pump with a fully magnetically suspended rotor to improve blood compatibility when pumping blood is disclosed. The pump stabilizes radial displacements of a disc-like rotor with active control through separate electric motor and magnetic bearings to improve the pump's critical performances including device packaging size, system simplicity and reliability, stiffness and other dynamic performances of suspension, power efficiency, and others.

A magnetic coupling device includes a magnetic flywheel unit including a flywheel and multiple first magnets equiangularly spaced around the periphery of the flywheel to form a first annular magnetic series with the same pole facing toward the radial outer side of the flywheel, and a magnetic coupling unit including a plate body rotatably mounted to the periphery of the flywheel, a rotating shaft mounted to the center of axis of the plate body, multiple second magnets and third magnets alternatively mounted on the plate body around the rotating shaft to create a second annular magnetic series that is magnetically coupled to the first annular magnetic series. Further, a magnetoresistive ring frame is mounted to the periphery of the flywheel for movement along the axial direction of the flywheel to create a magnetic coupling control device.