A method for determining a relative angular position between two parts about an axis of rotation (A), implementing a magnetized body (10), in the shape of an angular curved sector about the axis of rotation (A), characterized in that the magnetization plane of the magnetized body (PM) is parallel to the axis of rotation (A), for a sensor system having such a magnetized body, and to a method for manufacturing such a magnetized body.

Disclosed herein are medical-device magnetizer systems and methods. In an example, a magnetizer system can be configured to impart one or more magnetic signatures to a medical device having ferrous elements for medical-device tracking. Such a magnetizer system can include, in some embodiments, a magnetizer. The magnetizer can have an elongate body with a single-dipole section, a multipole section, and a plurality of magnets configured to generate two or more magnetic fields. The single-dipole section can have a magnetizer body defining a cavity having a first magnetic field therein. The multipole section can have a second magnetic field therein. In another example, a method can include imparting a magnetic signature to a plurality of medical devices having ferrous elements using the magnetizer system.

An apparatus for manufacturing a rotor includes a magnetizer. The magnetizer is configured to magnetize a permanent magnet in a rotor from outside the rotor. The rotor includes a rotor core having a magnet insertion hole. The permanent magnet is provided in an embedded state in the magnet insertion hole and has a bent-back shape protruding radially inward. The magnetizer includes a first yoke portion, a second yoke portion, and a magnetization coil. The first yoke portion has an opposing portion facing an outer peripheral surface of the rotor. The second yoke portion forms a magnetic path together with the first yoke portion. The magnetization coil is disposed on the magnetic path of the first and second yoke portions. The magnetizer magnetizes the permanent magnet by energizing the magnetization coil to apply a magnetizing magnetic flux at least through the rotor between the first yoke portion and the second yoke portion, which are located opposed to each other in a radial direction of the rotor.

A method of manufacturing a polar anisotropic magnet includes manufacturing polar anisotropic magnets 1N, 1S having four surfaces SF1, SF2, SF3. The method includes: an in-field molding step S20 for performing molding in a magnetic field while applying a magnetic field in a first direction of one effective surface VSF (SF1) among the four surfaces and applying a magnetic field in a second direction to the remaining three surfaces (SF2, SF3, SF4); and a four-way magnetization step S40 for performing magnetization by applying a magnetic field in the first direction to the effective surface VSF (SF1) and by applying a magnetic field in the second direction to the remaining three surfaces (SF2, SF3, SF4). The present invention provides a method of manufacturing a polar anisotropic magnet and a method of manufacturing a magnet assembly that have a higher degree of freedom in designing and are more economical than other approaches.

A superconductor bulk magnet magnetizing method providing a more homogenous trapped magnetic field includes: placing the bulk magnet inside a charger bore of an electrical charger magnet; placing a field correction unit inside a superconductor bore of the bulk magnet; applying an electrical current (I.sub.0) to the charger magnet, to generate an externally applied magnetic field, wherein a temperature T.sub.bulk of the bulk magnet exceeds a bulk magnet critical temperature T.sub.c; applying an auxiliary electrical current (I.sub.1, . . . ) to the field correction unit, thus generating an auxiliary magnetic field applied to the bulk magnet from within the superconductor bore, wherein T.sub.bulk>T.sub.c; lowering T.sub.bulk below T.sub.c; turning off the electrical current at the charger magnet, wherein T.sub.bulk<T.sub.c, and turning off the auxiliary electrical current at the field correction unit, wherein T.sub.bulk<T.sub.c; and removing the bulk magnet from the charger bore while T.sub.bulk<T.sub.c.

The present disclosure discloses a method for the magnetism stabilizing treatment of a permanent magnet material. The method can include the following steps: providing a permanent magnet material having a positive temperature coefficient of coercivity; magnetizing the permanent magnet material at a temperature T.sub.3 with a range of −200 degree centigrades to 200 degree centigrades; and performing a magnetism stabilizing treatment towards the permanent magnet material with temperature decreased in a range of the temperature T.sub.3 to a temperature T.sub.4, or at the temperature T.sub.3.

An apparatus for magnetic annealing one or more workpieces, and a method of operating the apparatus, are described. The apparatus includes: a workpiece holder configured to support one or more workpieces, wherein the one or more workpieces having at least one substantially planar surface; an optional workpiece heating system configured to elevate the one or more workpieces to an anneal temperature; and a magnet assembly having a first magnet and a second magnet, the first and second magnets defining a gap between opposing poles of each magnet, wherein the magnet assembly is arranged to generate a magnetic field substantially perpendicular to the planar surface of the one or more workpieces.

Charging method for a superconductor magnet system with reduced stray field, weight and space includes: arranging the system within a charger magnet bore; with T.sub.main>T.sub.main.sup.crit and T.sub.shield>T.sub.shield.sup.crit, applying a current I.sub.charger to the charger magnet and increasing I.sub.charger to a first current I.sub.1>0; lowering a main superconductor bulk magnet temperature T.sub.main to an operation temperature T.sub.main.sup.op, with T.sub.main.sup.op<T.sub.main.sup.crit, while keeping T.sub.shield>T.sub.shield.sup.crit; lowering I.sub.charger to a second current I.sub.2<0, thereby inducing a persistent current IP.sub.main in the main magnet; lowering a shield magnet temperature T.sub.shield to an operation temperature T.sub.shield.sup.op, with T.sub.shield.sup.op<T.sub.shield.sup.crit; increasing I.sub.charger to zero, thereby inducing a persistent current IP.sub.shield in the shield magnet; removing the magnet system from the charger bore, and keeping T.sub.main≤T.sub.main.sup.op with T.sub.main.sup.op<T.sub.main.sup.crit and T.sub.shield≤T.sub.shield.sup.op with T.sub.shield.sup.op<T.sub.shield.sup.crit; where: T.sub.main.sup.crit: main magnet critical temperature and T.sub.shield.sup.crit: shield magnet critical temperature.

Embodiments herein are directed to a system and a method of selectively manipulating magnetically-barcoded materials from background magnetic materials. Magnetic barcodes include layers of magnetic anisotropy. These are then manipulated by a magnetic system that can drive spatio-temporal magnetic fields that can “match” a barcode to drive a specific interaction, thereby providing a “lock-key” interaction. This technique is able to selectively manipulate magnetically-barcoded materials, and can have applications across a variety of magnetic systems such as cell separation, drug delivery, valves, and motors.

The method for manufacturing the Halbach magnet array includes the steps of: (a) magnetizing at least two first magnetic material pieces in a direction parallel to a first direction, and (b) magnetizing at least one second magnetic material piece in a direction parallel to a second direction perpendicular to the first direction, in this order. In the step (a), the first magnetic material pieces and the second magnetic material piece are alternately arranged in the second direction with the first magnetic material pieces being each adhered to the adjacent second magnetic material piece, and the magnetization is performed under a condition in which a residual magnetization ratio r1 of the first magnetic material pieces is higher than a residual magnetization ratio r2 of the second magnetic material piece.