Magnet array structure includes a first linear magnet array having a plurality of consecutively arranged first Halbach arrays and a second linear magnet array having a plurality of consecutively arranged second Halbach arrays. The first linear magnet array, from a first end of the magnet array structure to a second end of the magnet array structure, having magnetic flux orientations rotating in a first direction, and the second linear magnet array, from the first end of the magnet array structure to the second end of the magnet array structure, having magnetic flux orientations rotating in a second direction that is opposite the first direction. The first linear magnet array is arranged parallel to the second linear magnet array so that, between the first and second ends of the magnet array structure, the first Halbach magnetic arrays are linearly offset from the second Halbach magnetic arrays.

A permanent magnet having excellent magnetic properties, and a device including such a permanent magnet are provided. A permanent magnet consists of a sintered compact having a composition consisting of, in a mass percentage composition, R: 23 to 27% (R is a rare-earth element including at least Sm); Fe: 22 to 27%; Mn: 0.01 to 2.5%; and a remainder consisting of Co and unavoidable impurities, in which the sintered compact contains a plurality of crystal grains and grain boundaries, an average crystal grain size (A. G.) of the crystal grains is equal to or larger than 100 μm, and a coefficient of variation (C. V.) of crystal grain sizes is equal to or smaller than 0.60.

Disclosed is a segmented magnet which may adjust the application direction of a heavy rare earth element for grain boundary diffusion depending on the magnetization direction of the segmented magnet so as to simplify the manufacturing process of the segmented magnet while reducing eddy current loss, and a method for manufacturing the same. The method includes preparing a plurality of permanent magnet parent bodies having a constant magnetization direction, diffusing a diffusion material into the prepared permanent magnet parent bodies via a pair of planes thereof opposite each other and parallel to the magnetization direction along grain boundaries so as to form a pair of diffusing surfaces, preparing a permanent magnet assembly by stacking the permanent magnet parent bodies in a line such that the diffusing surfaces thereof face each other, and segmenting the permanent magnet assembly into a plurality of pieces along planes perpendicular to the magnetization direction.

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.

Electromechanical lock and method are disclosed. The lock includes: a movable permanent magnet to move between a first position and a second position; a stationary permanent semi-hard magnet; and an electrically powered magnetization coil positioned adjacent to the stationary permanent semi-hard magnet to switch a polarity of the stationary permanent semi-hard magnet between a first magnetization configuration and a second magnetization configuration. The first magnetization configuration of the stationary permanent semi-hard magnet moves the movable permanent magnet to the first position. The second magnetization configuration of the stationary permanent semi-hard magnet moves the movable permanent magnet to the second position. A magnetic axis of the movable permanent magnet is side by side with a magnetic axis of the stationary permanent semi-hard magnet.

A magnetizer including a housing, a passage arranged inside the housing, and a permanent magnet assembly arranged outside the passage to provide a magnetic field passing through the passage. The housing defines an inlet to the passage and an outlet from the passage such that an object to be magnetised can be inserted into the passage via the inlet in the housing and removed via the outlet in the housing. The passage includes a uniform portion where opposing surfaces of the permanent magnet assembly are arranged a uniform distance apart along the length of the uniform portion and a diverging portion arranged between one end of the uniform portion of the passage and the outlet of the housing.

A hybrid permanent magnet-electromagnet flux device including a plurality of electromagnets and permanent magnets cooperatively arranged to provide a first magnetic array such that when the electromagnets are activated in a first state the first magnetic array of magnets implements a Halbach array generating an augmented magnetic field on a first side of the first magnetic array and a cancelling magnetic field on opposite facing second side of the first magnetic array, and when the electromagnets are activated in a second state a respective magnetic field orientation of each of the electromagnets is reversed from that of the first state.

A permanent magnet for a motor, a rotor assembly having the permanent magnet, a motor, and a compressor are disclosed. The permanent magnet has a Nd—Fe—B-based main phase. The main phase has a grain size of smaller than or equal to 4 micrometers. The mass ratio of dysprosium and/or terbium in the permanent magnet is less than or equal to 0.5%. The intrinsic coercivity Hcj of the permanent magnet at 25° C. satisfies Hcj≥1500 kA/m. The permanent magnet according to embodiments of the present disclosure can have fewer or no heavy rare-earth elements, and meanwhile exhibit excellent performance, which improves the cost performance.

A switchable magnetic apparatus has a front layer, a rear layer, and a manipulating mechanism for changing the relative arrangement of the magnets to change the apparatus between ON and OFF states. The front layer has one or more front-layer magnets and a plurality of interleaved ferromagnetic components. The rear layer has one or more rear-layer magnets. When the magnetic apparatus is OFF, some or all of the rear-layer magnets overlap some or all of the ferromagnetic components, wherein the ferromagnetic components experience opposite poles between the adjacent front-layer magnets compared to the adjacent rear-layer magnet. When the magnetic apparatus is ON, some or all the rear-layer magnets overlap some or all the ferromagnetic components, wherein the ferromagnetic components experience the same magnetic pole from the adjacent front-layer magnets and the adjacent rear-layer magnet.

A method for continuous manufacture of permanent magnets. A material sheet is formed into an open tube, having a lengthwise opening. Magnetic powder may be poured into the lengthwise opening on a continuous basis. The tube opening is then formed closed and sealed. The magnetic powder is magnetically pre-aligned by subjecting it to a first magnetic field. The tube containing the powder may be compressed into a desired shape, forming an elongated permanent magnet. After compression, the elongated magnet is magnetized by a second magnetic field in two-step process, wherein the elongated permanent magnet is subjected to a magnetic field from first magnetizing coil that is pulsed with a first electric current in a first direction, followed by a second magnetizing coil being pulsed with a second magnetizing electric current in a second direction. The elongated magnet may be formed into any arbitrary shape, such as a ring or coil.