A rotating magnetic field generation device of the present invention includes: a magnetic field generating unit including disks in which a plurality of magnets are arranged circumferentially, a magnetic field working space formed by stacking the disks at intervals to make the plurality of magnets face each other, and a shaft to which the stacked disks are fixed, the shaft being installed at a central axis of the disks; an adiabatic vacuum vessel in which the magnetic field generating unit is installed; and a drive mechanism that is installed in a room temperature region and rotates the shaft.

Various implementations include a magnetic heat exchange device including a magnetocaloric chamber, a magnet, a heating loop, and a cooling loop. The magnetocaloric chamber contains a magnetocaloric material and is configured to transfer heat between the magnetocaloric material and a fluid. The magnet is movable between a first position and a second position. The magnetic field from the magnet interacts with the magnetocaloric material in the first position, and the magnetic field from the magnet does not interact with the magnetocaloric material in the second position. In the heating mode, the magnet is in the first position and the fluid flows through the heating loop and the magnetocaloric chamber. In the cooling mode, the magnet is in the second position and the fluid flows through the cooling loop and the magnetocaloric chamber.

A magneto-caloric thermal diode assembly includes a first magneto-caloric cylinder and a second magneto-caloric cylinder. First and second pluralities of thermal stages are stacked along an axial direction between a cold side and a hot side. The second magneto-caloric cylinder and the second plurality of thermal stages are nested concentrically within the first magneto-caloric cylinder and the first plurality of thermal stages. Each thermal stage of the first and second pluralities of thermal stages includes a plurality of magnets and a non-magnetic ring. The plurality of magnets is distributed along a circumferential direction within the non-magnetic ring in each thermal stage of the first and second pluralities of thermal stages.

A magneto-caloric thermal diode assembly includes a magneto-caloric regenerator with a plurality of magneto-caloric stages. Each of the plurality of magneto-caloric stages has a respective Curie temperature. Each of the plurality of magneto-caloric stages also has a stack of magneto-caloric material blocks and metal foil layers distributed sequentially along an axial direction in the order of magneto-caloric material block then metal foil layer.

A magneto-caloric thermal diode assembly includes a magneto-caloric cylinder with a plurality of magneto-caloric stages. A length of one of the plurality of magneto-caloric stages is different than a length of another of the plurality of magneto-caloric stages. Each of a plurality of thermal stages includes a plurality of magnets and a non-magnetic ring. The plurality of magnets is distributed along a circumferential direction within the non-magnetic ring in each of the plurality of thermal stages. The length of each of the plurality of thermal stages corresponds to a respective one of the plurality of magneto-caloric stages.

A magneto-caloric thermal diode assembly includes a magneto-caloric cylinder. Each of a plurality of thermal stages includes a plurality of magnets and a non-magnetic ring. The plurality of magnets is distributed along a circumferential direction within the non-magnetic ring in each of the plurality of thermal stages. A variable speed motor is coupled to one of the magneto-caloric cylinder and the plurality of thermal stages. The variable speed motor is operable to rotate the one of the magneto-caloric cylinder and the plurality of thermal stages relative to the other of the magneto-caloric cylinder and the plurality of thermal stages.

A magneto-caloric thermal diode assembly includes a magneto-caloric cylinder with a plurality of magneto-caloric stages. Each of the plurality of magneto-caloric stages has a respective Currie temperature. The magneto-caloric cylinder has a length along an axial direction. The plurality of magneto-caloric stages is distributed along the length of the magneto-caloric cylinder. A plurality of thermal stages also has a length along the axial direction. The length of the plurality of thermal stages is less than the length of the magneto-caloric cylinder. The magneto-caloric cylinder is received within the plurality of thermal stages such that the magneto-caloric cylinder is movable along the axial direction relative to the plurality of thermal stages.

A magneto-caloric thermal diode assembly includes a magneto-caloric cylinder with a plurality of magneto-caloric stages. Each of the plurality of magneto-caloric stages has a respective Curie temperature. The magneto-caloric cylinder also includes a plurality of insulation blocks and a plurality of pins. The plurality of magneto-caloric stages and the plurality of insulation blocks are distributed sequentially along an axial direction in the order of magneto-caloric stage then insulation block. One or more the plurality of pins extends along the axial direction between each magneto-caloric stage and a respective insulation block within the magneto-caloric cylinder.

A magneto-caloric thermal diode assembly includes a plurality of thermal stages stacked along an axial direction between a cold side and a hot side. A plurality of magnets is distributed along a circumferential direction within a non-magnetic ring in each of the plurality of thermal stages. Each of the plurality of thermal stages between a cold side thermal stage and a hot side thermal stage is positioned between a respective pair of the plurality of thermal stages along the axial direction. The plurality of magnets of each of the plurality of thermal stages between the cold side thermal stage and the hot side thermal stage is spaced from the non-magnetic ring of one of the respective pair of the plurality of thermal stages along the axial direction and is in conductive thermal contact with the non-magnetic ring of the other of the respective pair of the plurality of thermal stages.

A magneto-caloric thermal diode assembly includes a plurality of elongated magneto-caloric members. Each of a plurality of thermal stages includes a plurality of magnets and a plurality of non-magnetic blocks distributed in a sequence of magnet then non-magnetic block along a transverse direction. The plurality of thermal stages and the plurality of elongated magneto-caloric members are configured for relative motion along the transverse direction. The plurality of magnets and the plurality of non-magnetic blocks are spaced along the transverse direction within each of the plurality of thermal stages. Each of the plurality of magnets in the plurality of thermal stages is spaced from a respective non-magnetic block in an adjacent thermal stage towards a cold side thermal stage along the lateral direction and is in conductive thermal contact with a respective non-magnetic block in an adjacent thermal stage towards a hot side thermal stage along the lateral direction.