An electronic device or electronic device assembly may comprise a first portion and a second portion, a first magnet disposed inside the first portion and rotatable about a pivot axis with respect to the first portion, and a second magnet disposed inside the second portion and rotatable about a pivot axis with respect to the second portion. The first and second magnet may be configured to rotate so that the first and second magnets magnetically engage each other when the distance between the first and second magnet is equal to or smaller than a first distance.

An apparatus for assembling a repelling magnet combination, comprising a first and second magnet, a first and second holding magnet, a first holding base with a first holding base first end, and a second holding base with a second holding base first end. The first and second holding magnets are positioned at the first and second holding base first ends, and the first and second magnets are magnetically attached to the first and second holding magnets respectively, with outward faces exhibiting like magnetic polarities. The first and second magnets are brought into contact by moving the first and second holding base first ends into close proximity, whereby the first and second holding magnets exert holding forces on the first and second magnets which overcome a repelling force generated therebetween, allowing a repelling force countering means, such as an adhesive, to bond the magnets together into a repelling magnet combination.

Connector element includes an enclosure made of a generally non-magnetic material having an open face; an insulating plate with a plate aperture; a permanent magnet placed inside the enclosure, the magnet dimensions preventing egress from the enclosure through the plate aperture; a washer made of a conductive soft ferromagnetic material with a washer aperture being larger than dimensions of said permanent magnet, placed inside the enclosure. Also disclosed are transformable electronic devices, optionally including displays, toys and educational kits built using the self-actuating connector elements.

A magnetic assembly includes magnets arranged in a Halbach array. The magnets include a first magnet and a second magnet positioned adjacent the first magnet. The first magnet and the second magnet have adjacent surfaces. A cavity is formed in the each of the adjacent surfaces and is aligned with the cavity formed in the adjacent surface of the adjacent magnet. The magnetic assembly also includes a ferromagnetic pin positioned within the aligning cavities to connect the first magnet and the second magnet. The ferromagnetic pin has a size, a shape, and a magnetic permeability that facilitate a magnetic force between the first surface and the second surface inducing a magnetic flux path through the ferromagnetic pin such that an apparent magnetic force between the first surface and the second surface is one of i) a repelling force less than 5 newtons (N) and ii) an attracting force.

A pipeline demagnetization device based on a permanent magnet structure includes a central piece and permanent magnets distributed on the central piece. A magnetic field with alternating directions is formed in a wall of a pipeline in an axial direction from front to back, and strength of the magnetic field gradually decreases. The pipeline demagnetization device can be applied to the pipeline demagnetization using a built-in structure or an externally-built structure. The pipeline demagnetization device spatially constructs a set of stable alternately-decayed magnetic fields, so that the wall of the pipeline experiences the set of alternately-decayed magnetic fields when the pipeline that is magnetized spatially displaces relative to the set of alternately-decayed magnetic fields, thereby realizing demagnetization.

A magnetic assembly structure has a main body and an inserting component. A first receiving slot of the main body receives a first magnetic component, and a second receiving slot of the main body penetrates a main body surface to form a main body opening on the main body surface. An engagement slot of the main body is disposed between the first receiving slot and the second receiving slot, communicated with the second receiving slot, and has a contacting surface being away from the main body surface with a distance. The receiving slot of the inserting component receives a second magnetic component. The inserting component is inserted into the second receiving slot via the main body opening, and the second magnetic component moves into the engagement slot. The magnetic assembly is assembled with a less force, has higher safety, and is hard to be disassembled without allowance or explanations.

Improved manufacturing processes and resulting anisotropic permanent magnets, such as for example alnico permanent magnets, having highly controlled and aligned microstructure in the solid state are provided. A certain process embodiment involves applying a particular orientation and strength of magnetic field to loose, binder-coated magnet alloy powder particles in a compact-forming device as they are being formed into a compact in order to preferentially align the magnet alloy powder particles in the compact. The preferential alignment of the magnet alloy powder particle is locked in place in the compact by the binder after compact forming is complete. After removal from the device, the compact can be subjected to a subsequent sintering or other heat treating operation.

The present disclosure provides a stellarator magnet based on cubic permanent magnet blocks and an arrangement optimization method thereof. For the characteristic that a three-dimensional magnet coil of a stellarator is complex in structure, the present disclosure provides the stellarator magnet based on the cubic permanent magnet blocks with uniform magnetization, same magnetization and same size; the magnetization directions of the cubic permanent magnet blocks are defined in a limited number of fixed alternative directions; the magnetic field configuration of the stellarator is generated by dipole magnetic fields provided by the permanent magnet blocks and planar coils, so that the device complexity of the stellarator is reduced, and the difficulty and cost of the machining and installation of the magnet are reduced. The shape of the permanent magnet blocks can be replaced by other regular shapes, and the permanent magnet is still formed by the permanent magnet blocks with same shape, same size, uniform magnetization and same magnetization. For the magnet, the present disclosure provides a magnet arrangement optimization method of ‘local compensation’ and related optimization strategies of ‘threshold truncation,’ ‘global fine tuning,’ etc., for meeting different optimization requirements on accuracy of the magnetic fields, usage qualities of magnets, etc., and a magnetic field meeting designing requirements can be obtained.

A magnet module includes at least one magnet unit. The magnet unit includes a first magnet member and a second magnet member surrounding the first magnet member in a plan view. The first magnet member extends along a first direction and includes a middle portion and an end portion. The first magnet member includes a first portion, which is disposed in the middle portion and extends along the first direction, and a second portion, which is disposed in the end portion and has a width greater than a width of the first portion.

A neodymium-iron-boron (NdFeB) magnet is represented by a chemical formula R1-R2-Fe-M-B, and has a composite structure of a high-coercivity region and a high-remanence region. In the formula R1 is a rare earth element comprising at least Nd, R2 is a heavy rare earth element comprising at least Dy and/or Tb, and M is a transition metal element comprising at least Co. The neodymium-iron-boron magnet can greatly improve resistance to high-temperature demagnetization and inhibit reduction of magnetic flux of a magnet by adopting a small amount of Dy/Tb. The magnet can be used in an embedded high-speed motor. The preparing method for the magnet improves the material utilization and the production efficiency, and is feasible for a large-scale production.