Abstract: A cylindrical permanent magnet device that induces in a central area of interest a homogeneous magnetic field of predetermined orientation relative to a longitudinal axis (z) of the device comprises first and second annular magnetized structures (111, 121) disposed symmetrically relative to a plane (P) that is perpendicular to the longitudinal axis (z) and contains the central area of interest, and a third annular magnetized structure (112, 122) disposed between the first and second structures (111, 121) and also disposed symmetrically relative to the plane (P) of symmetry. The first, second, and third annular magnetized structures (111, 121, 112, 122) are divided into components in the form of sectors.

Abstract: A method of manufacturing an apparatus 200 comprising forming an integrated magnetometer package 202. Forming an integrated magnetometer package 202 includes forming a movable part 215 from a MEM magnetometer substrate 210, and attaching an integrated circuit 910 to one side 212 of the MEM magnetometer substrate. A spacer structure 410 is formed on an opposite side of the MEM magnetometer substrate such that the moveable part is exposed through an opening 420 in the spacer structure. But the moveable part cannot escape through said opening. A permanent magnet 1010 is mounted through the opening to the movable part.

Abstract: The present invention provides a method for mounting at least one magnetic pole of a rotor of a motor of a synchronous electrical rotating machine from elementary elements, the rotor including a hub. The method includes the following successive steps: forming the set of elementary elements of rectangular parallelepipedal shape by fixing at least two elementary elements to each other with an electrical insulator being interposed therebetween; the set of elementary elements being magnetizable; machining a main face of the set of elementary elements in order to form a cylindrical face having a radius substantially equal to the predefined radius of the hub; magnetizing the set of elementary elements; and fixing the set of elementary elements to the hub, the set of elementary elements forming at least a portion of the magnetic pole.

Abstract: A pole tube of a solenoid actuator including a non-magnetic intermediate piece having a first intermediate end face and a second intermediate end face, a pole piece having a pole end face configured to join the first intermediate end face at a first joining region, and a tube piece having a tube end face configured to join the second intermediate end face at a second joining region. At least two of the intermediate piece, the pole piece and the tube piece are configured to be connectable to each other using electric fusion. At least two of the intermediate piece, the pole piece and the tube piece have a different conductivity. A respective part of the pole and tube pieces disposed in corresponding first and second joining regions are configured to each have an electrical resistance substantially equal to an electrical resistance of a part of the intermediate piece.

Abstract: A nanomagnetic flip-flop, or register. The nanomagnetic register receives a signal from an input signal nanomagnet on a first clock cycle, and provides the input to an output signal nanomagnet on a second clock cycle. The input signal nanomagnet and the output signal nanomagnet are arranged on a substrate. Each of the signal nanomagnets has an easy axis and a hard axis that are substantially in a signal plane. A register nanomagnet is arranged on the substrate between the input signal nanomagnet and the output signal nanomagnet. The register nanomagnet has an easy axis and a hard axis that are substantially in a register plane. The register plane is not coplanar with the signal plane.

Abstract: A rotor core of a rotating electrical machine formed by stacking a plurality of blanks blanked from a steel sheet, the blank having a yoke, a magnetic pole portion confronting the yoke, and a magnet insertion hole positioned between the yoke and the magnetic pole portion, the magnetic pole portion having a projection projecting circumferentially at two circumferential sides thereof.

Abstract: A method of producing a laminated variant-shaped core 10, includes punching out core sheets 12-14 from a strip 11 to form the outlines of the core sheets 12-14, and push back the punched out core sheets 12-14 into the strip 11; forming cutouts 28, 30 and 32 reaching outer peripheries of outer plates 27, 29 and 31, the outer plates 27, 29 and 31 being the same in outer shape and respectively containing thereinside the core sheets 12-14, the cutouts 28, 30 and 32 having inner edges respectively in contact with the core sheets 12-14; forming caulking portions 21 in each of the core sheets 12-14 and caulking portions 33 in each of the outer plates 27, 29 and 31; punching out the outer plates 27, 29 and 31 from the strip 11 to form the outlines of the outer plates 27, 29 and 31, and laminating and interlocking the core sheets 12-14 to form the variant-shaped laminated core 10 and laminating and interlocking the outer plates 27, 29 and 31; and removing the outer plates 27, 29 and 31 located outside the laminated an

Abstract: A method and system for propagating signals along a line of nanomagnets. Nanomagnets having an easy axis and a hard axis are provided a biaxial anisotropy term, which increases metastability along the hard axis. The nanomagnets are forced into hard-axis alignment. A magnetization direction of a first nanomagnet is caused to cant upward. Dipole coupling interactions between the first nanomagnet and an adjacent nanomagnet cause a magnetization direction of the adjacent nanomagnet to cant downward in an anti-parallel alignment. This cascade continues reliably along the line of nanomagnets. The biaxial anisotropy term provides additional stability along the hard axis to ensure the nanomagnets do not prematurely align along the easy axis. Various logic gates using nanomagnets, stabilizer nanomagnets, destabilizer nanomagnets, and magnetic diodes are also disclosed.

Abstract: A unilateral NMR sensor comprising a ferromagnetic yoke; a permanent magnet arranged on the yoke; a pole piece on the magnet; the pole piece including an air-pole piece interface surface whose shape corresponds to an equipotential contour of magnetic scalar potential. An approach for designing single-sided magnets suitable for unilateral magnetic resonance (UMR) measurements is presented. The method uses metal pole pieces to shape the field from permanent magnets in a target region. The pole pieces are shaped according to solutions to Laplace's equation, and can be designed using a combination of analytical methods and numerical optimization. The design leads to analytical expressions for the pole piece shape and magnetic field. The method is developed in Cartesian, polar, and spherical coordinates, and the merits of each system are discussed. The effects of finite magnet size on the field quality are explored through simulation, and are found to have a substantial effect in many cases.

Abstract: A method of manufacturing a magnetic resonance imaging (MRI) device is provided including providing at least one magnet positioned between a keeper device and a yoke, the keeper device being positioned at a pole region of the at least one magnet, positioning at least one pole device at the pole region of the at least one magnet, and removing the keeper device from the pole region to allow the at least one pole device to be positioned at the pole region of the at least one magnet.

Abstract: A method of producing a laminated armature for a fuel injector provides providing a plurality of laminations (10) in plate-shaped strip stock material (12). Each lamination has a base (11) and a plurality of tabs (20, 22) extending from the base. The base and tabs are coplanar. The laminations are cut from the strip material, with the tabs having free ends (25). The tabs are bent so as to be generally transverse with respect to the base. The laminations are then stacked on top of each other and joined together. The free ends of the tabs are cut to define a generally planar impact surface.

Abstract: A gapped core leg for a shunt reactor, comprising magnetic core elements separated by spacers cast directly between the core elements. Accordingly, a rigid core leg construction is achieved.

Abstract: A method of manufacturing a rotor magnet for a micro rotary electric machine is provided which includes steps of: a process in which a plurality of thick films, each of which is made of nanocomposite texture composed of ?Fe and R-TM-B where R is either 10 to 20 atomic % Nd or 10 to 20 atomic % Pr, B is 5 to 20 atomic % and TM is either Fe or partly Co-substituted Fe with 0 to 16 atomic %, are formed into a laminated magnet including isotropic nano-crystalline texture which contains ?Fe and R2TM14B and which has a remanence, Mr, of 0.95 T or more; and a process where the laminated magnet is multi-polar magnetized in-plane of the thick films.

Abstract: An instrument transformer for measuring properties of electricity in a power line is provided. The instrument transformer includes a cover section releasably secured to a base section. The cover section includes a first core segment encapsulated in a first encasement formed from a polymer resin. The base section includes a second core segment with a low voltage winding mounted thereto and a voltage transformer, all of which are encapsulated in a second encasement formed from a polymer resin. When the cover section and the base section are secured together, the first core segment adjoins the second core segment, thereby forming a current transformer having a core formed from the first and second core segments. A method for making the instrument transformer further comprises the connection of the cover section to the base section to form a passage through which a high voltage conductor may extend.

Abstract: The claimed invention pertains to methods of forming one or more inductors on a semiconductor substrate. In one embodiment, a method of forming an array of inductor core elements on a semiconductor substrate that includes integrated circuits is disclosed. A first set of spaced apart metallic core elements are formed over the substrate. Isolation sidewalls are then formed on side surfaces of the core elements. Afterward, a second set of metallic core elements are formed over the substrate. The first and second sets of core elements are substantially co-planar and interleaved such that only the isolation sidewalls separate adjacent core elements. Particular embodiments involve other processing operations, such as the selective electroplating of different types of metal to form core elements and/or the deposition and etching away of an isolation layer to form isolation sidewalls on the core elements.

Abstract: Various embodiments includes a stacked open pattern inductor fabricated above a semiconductor substrate. The stacked open pattern inductor includes a plurality of parallel open conducting patterns embedded in a magnetic oxide or in an insulator and a magnetic material. Embedding the stacked open pattern inductor in a magnetic oxide or in an insulator and a magnetic material increases the inductance of the inductor and allows the magnetic flux to be confined to the area of the inductor. A layer of magnetic material may be located above the inductor and below the inductor to confine electronic noise generated in the stacked open pattern inductor to the area occupied by the inductor. The stacked open pattern inductor may be fabricated using conventional integrated circuit manufacturing processes, and the inductor may be used in connection with computer systems.

Abstract: Electromechanical relays and semiconductor structures and microelectromechanical systems including at least part of an electromechanical relay are presented. For example, an electromechanical relay includes an electrically conductive terminal within a printed circuit board, one or more electrically conductive contacts, and one or more magnetic actuators. The one or more magnetic actuators are respectively associated with the one or more electrically conductive contacts and each magnetic actuator includes (i) a magnetic core within at least one via extending through one or more layers of the printed circuit board, and (ii) an electrical coil around at least a portion of the magnetic core and within one or more layers of the printed circuit board. Activation of the one or more actuators causes electrical contact between the terminal and an associated one of the one or more electrically conductive contacts.

Abstract: A method comprising: a first process of placing a laminated rotor core in a preheating device to preheat the laminated core; a second process of removing the preheated laminated core from the preheating device and disposing the laminated core between upper and lower dies of a resin sealing apparatus; a third process of pressing the laminated core by the upper and lower dies and liquefying resin material in resin reservoir pots by heating; and a fourth process of ejecting the liquefied resin material from the pots into the magnet insertion holes by plungers inserted and moving vertically in the pots and thermally curing the resin material. The method improves efficiency of resin sealing the permanent magnets in the laminated core.

Abstract: In a method for magnetizing a permanent magnet for a motor, the permanent magnet has a thickness t in a radial direction of the permanent magnet satisfying the relation of t??D/(NM??), where D represents an inner diameter of the permanent magnet having a value of 20 mm or less, N represents the number of the magnetic domains of the permanent magnet, and M represents the number of alternating current phases for driving the motor. In a first magnetizing step, the permanent magnet is magnetized in one direction corresponding to the radial direction. In a second magnetizing step, the permanent magnet magnetized in the first magnetizing step is magnetized to form inverse magnetic domains that are arranged at regular intervals in the radial direction and that reverse the magnetizing direction of the permanent magnet.

Abstract: A method of forming an actuating mechanism for a probe storage system includes providing a scanner chip having a main body including first and second outer surfaces and first and second coil mounting cavities. First and second coils are positioned in respective ones of the first and second coil mounting cavities. First and second magnet receiving pockets are formed in a first plate with first and second magnets being positioned in corresponding ones of the first and second magnet receiving pockets. The first plate is arranged relative to one of the first and second outer surfaces of the scanner chip with the first and second magnets registering with respective ones of the first and second coils. The first plate is spaced from the one of the first and second outer surfaces by a gap of less than about 10 microns.

Abstract: A group of magnetic strands are configured into a minimal number of solid magnetized toroidal rings with a conical magnetization direction and then aligned, stacked and assembled into a magic sphere magnetic structure. Each magnetized toroidal ring has predetermined dimensions to form the inner and outer surfaces of a spherical shell. The present invention also encompasses a magic sphere magnetic device with unsegmented solid magnetized toroidal rings and methods for assembling a magic sphere by stacking magnetized toroidal rings with a conical magnetic direction.

Abstract: A method of applying at least one magnet to a surface of a component made of a magnetic material includes placing the at least one magnet in a holding apparatus, and positioning the holding apparatus in the immediate vicinity of the component. A holding element applies a holding force to the at least one magnet to hold it in the holding apparatus. The holding element is deactivated such that the holding force is reduced, and the at least one magnet is transferred to the surface of the component. A holding apparatus for applying at least one magnet to a surface of a component made of a magnetic material includes a surface region for supporting the at least one magnet and at least one deactivatable holding element for applying a force on the at least one magnet.

Abstract: A current transformer core has a ratio of the core outside diameter Da to the core inside diameter Di of <1.5, a saturation magnetostriction ?s of =|4| ppm, a circular hysteresis loop with 0.50=Br/Bs=0.85 and an Hcmax=20 mA/cm. The current transformer core is made of a soft magnetic iron alloy in which at least 50% of the alloy structure is occupied by fine-crystalline particles with an average particle size of 100 nm or less, and the iron-based alloy comprises, in essence, one combination.

Abstract: A patterned inductor includes a conductive path and a nanostructured magnetic composition deposited on the conductive path. The magnetic composition can be screen printed, inkjetted, electrodeposited, spin coated, physical vapor deposited, or chemical vapor deposited onto the conductive path.

Abstract: A planar transformer or balun device, having small trace spacing and high mutual coupling coefficient, and a method of fabricating the same is disclosed. The method may comprise providing a first and a second inductor on a primary and a second substrate respectively, interleaving at least partially the first inductor with the second inductor, coupling the primary and the secondary substrates to form a unitary structure, and providing electrical contacts to couple the first and second inductors with another device or circuit.

Abstract: A method of fabricating a coil-embedded inductor provides steps for obtaining uniform density of coil-embedded inductor. The cavity of a first die is filled with dust before being flipped, and then filled with dust a second time. The dust in the cavity is pressed only once for improving the density.

Abstract: A magnet core (1) that is suitable for use in a fault current circuit breaker and that is made of a helically wound, magnetically soft band has a top (4) and a bottom (5), the top (4) and the bottom (5) being formed by side surfaces (16) of the magnetically soft band. The magnet core (1) is fixed in a protective housing (6), and there is a contact cement (11) between the bottom (5) of the magnet core (1) and an inside wall (10) of the housing for fixing the magnet core (1).

Abstract: A magnet covering member made of a soft steel plate covers an outer surface of a magnetized permanent magnet placed in a rotor core of a rotor. The magnet covering member is detached from the permanent magnet when the rotor is incorporated into a stator of an alternator during an alternator assembling process. Because of a soft magnetic characteristic of the magnet covering member, an outer magnetic field generated by the permanent magnet placed between adjacent claw poles of the rotor core makes a magnetic short-circuit, and a magnetic attracting phenomenon caused by such a magnetic field is thereby reduced. The soft magnetic characteristic of the magnet covering member also serves to support the rotor.

Abstract: In a method for manufacturing a powder magnetic core, magnetic layer green sheets is formed by using magnetic metal particles having an insulating oxide layer on a surface thereof, and insulating layer green sheets are formed by using insulating particles. The magnetic layer green sheet and the insulating layer green sheet are alternately laminated, and the layers are press molded.

Abstract: Provided is a U-shaped iron core transfer/assembling method, by which a first leg iron core, a second-leg iron core and a lower-yoke iron core are housed in a first leg iron core tank, a second leg iron core tank and a lower-yoke iron core tank, respectively, and those iron cores are individually transported in sideways attitude. Next, the lower-yoke iron core is transferred into a lower-yoke iron core assembling tank. While the first leg iron core, the second leg iron core and the lower-yoke iron core being kept in the tilted postures, the first leg iron core tank, the second leg iron core tank and the lower-yoke iron core assembling tank are individually opened at their openings and are jointed to each other.

Abstract: Methods are provided for forming/inserting a magnet in a rotor. One method includes coating a plurality of magnetizable particles with a non-metallic material, inserting the coated particles in a rotor, and magnetizing the coated particles. Another method includes inserting a plurality of magnetizable particles into a rotor, submersing the rotor in motor varnish to coat the particles with motor varnish, and magnetizing the particles. Yet another method includes inserting a plurality of magnetizable particles in a rotor, inserting a non-metallic material into the rotor, mixing the particles and non-metallic material to form a mixture, curing the mixture to coat each particle with non-metallic material, and magnetizing the particles. Still another method includes mixing a plurality of magnetizable particles with a non-metallic material, curing the non-metallic material to coat each particle with non-metallic material, inserting the coated particles in a rotor, and magnetizing the coated particles.

Abstract: A magnet valve is installed by a method in which the fully machined valve member is locked in a receptacle of a fixed installation device. A magnet plate and a spacer plate are mounted on a receiving mandrel. The magnet plate, spacer plate and valve member are pressed against the receptacle, then the magnet plate and the spacer plate are displaced relative to the valve member, and the armature is secured to the receiving mandrel of the valve member in such a way that the armature then rests on the magnet plate.

Abstract: The invention relates to swinging inductors of a stepped-gap construction. We describe an inductor core structure having first and second core segments, constructed and arranged such that distal ends of legs of the first core segment are paired with distal ends of legs of the second core segment in an opposing relation. The at least one distal ends of the first core segment has a ridge projecting therefrom and is paired with the at least one distal ends of the second core segment which has a ridge projecting therefrom in an opposing relation, such that opposingly paired projecting ridges form a cross arrangement.

Abstract: A magnet rotor includes a drive arm with a rotary shaft and a hollow cylindrical-shaped permanent magnet bonded by a light curable resin. The drive arm is composed of a light transmitting resin, and the permanent magnet is an anisotropic magnet with an axis of easy magnetization. During fabrication, the light curable resin is applied to the rotary shaft, and a hollow portion of the magnet is fitted to the rotary shaft. While holding the magnet in a position where a direction of the axis of easy magnetization corresponds to a magnetic field direction, the drive arm is irradiated with light to cure the resin and bond the drive arm and the permanent magnet.

Abstract: A method to fabricate a molding inductor structure and a molding inductor structure are provided. The method comprises the steps of: performing a high pressure process on a first magnetic material to form a baseboard, wherein a central area of the baseboard comprises a pillar; providing a metal coil, wherein the metal coil comprises an open coil center; connecting the metal coil and the baseboard such that the pillar lodges in the open coil center; placing the connected metal coil and the baseboard into a mold; and forming a covering structure by stuffing a second magnetic material with a high pressure process to cover the connected metal coil and the baseboard to form the molding inductor structure.

Abstract: A manufacturing method of a magnetic element includes the steps of providing a first magnetic material, a second magnetic material, and at least one coil; disposing the coil in a mold; applying the first magnetic material in the coil to form a winding magnetic core; and applying the second magnetic material in the mold to form a magnetic body for covering the winding magnetic core.

Abstract: A magnetization apparatus for magnetizing a magnetic material provided inside a yoke housing of a motor, which has a connector portion radially outward of the yoke housing, includes at least one pair of magnetization cores and a plurality of magnetization coils. The at least one pair of magnetization cores are provided to oppose to each other, wherein the at least one pair of magnetization cores have corresponding magnetization surfaces, which oppose to each other. The plurality of magnetization coils generate a magnetic field at the at least one pair of magnetization cores, wherein the plurality of magnetization coils magnetize the magnetic material in a state, where the yoke housing is provided between the magnetization surfaces. The at least one pair of magnetization cores defines a receiving recess therein for receiving the connector portion of the motor in the state, where the yoke housing is provided between the magnetization surfaces.

Abstract: This invention utilizes silicon through via technology, to build a Toroid into the chip with the addition of a layer of magnetic material such as Nickel above and below the T-coil stacked multi-ring structure. This allows the connection between the inner via and an array of outer vias. This material is added on a BEOL metal layer or as an external coating on the finished silicon. Depending on the configuration and material used for the via, the inductance will increase approximately two orders of magnitude (e.g., by utilizing a nickel via core). Moreover, a ferrite material with proper thermal conduction properties is used in one embodiment.

Abstract: A manufacturing assembly is disclosed for manufacturing a disk drive. The manufacturing assembly comprises a pre-merge arm having a contact surface for contacting an actuator arm of the disk drive, and an actuator operable to actuate the pre-merge arm. When installing the actuator arm into the base of the disk drive, the actuator is operable to actuate the pre-merge arm in a first direction so that the contact surface biases the actuator arm rotationally about a pivot to bias the lift tab away from the ramp. After installing the actuator arm into the base of the disk drive, the actuator is operable to actuate the pre-merge arm in a second direction opposite the first direction so that the lift tab moves towards and contacts a ramp near an outer periphery of a disk.

Abstract: A method comprising: a first process of placing a laminated rotor core (13) in a preheating device (18) to preheat the laminated core (13); a second process of removing the preheated laminated core (13) from the preheating device (18) and disposing the laminated core (13) between upper and lower dies (14, 15) of a resin sealing apparatus (29); a third process of pressing the laminated core (13) by the upper and lower dies (14, 15) and liquefying resin material (17) in resin reservoir pots (16) by heating; and a fourth process of ejecting the liquefied resin material (17) from the pots (16) into the magnet insertion holes (12) by plungers (32) inserted and moving vertically in the pots (16) and thermally curing the resin material (17). The method improves efficiency of resin sealing the permanent magnets (11) in the laminated core (13).

Abstract: Presented herein is a shunted MTJ sensor formed of a plurality of electrically connected MTJ cells for measuring magnetic fields and currents and its method of fabrication. To provide stable single domain magnetic moments of the MTJ cells and to ensure that the magnetic moments return to a fixed bias point in the absence of external magnetic fields, the cells are formed of sufficiently small size and with elliptical cross-section of aspect ratio greater than 1.2. To eliminate the possibility of ESD damage to the cells, they are protected by a parallel shunt, formed as a trace of sufficiently high resistance that directs accumulated charges harmlessly to ground while bypassing the cells.

Abstract: A magnetic field effect sensor system having giant magneto-impedance elements. The elements may be elongated strips, and in proximity to and parallel with one another, and connected in series with connections or electrodes. The elements may have a regular shape without turns. They may have a single- or multi-layer structure. Some of the layers in the elements may contain a soft magnetic material, for instance, which form a closed loop for magnetic flux around a non-magnetic conductor.

Abstract: A passive nanomagnet alignment method is described to self-align a membrane to another surface. The membrane and the surface each have a plurality of nanomagnets patterned on it, wherein the nanomagnets are magnetized based on an applied external magnetic field. The membrane is brought into close proximity and coarse alignment to the surface by a positioning mechanism (e.g., an actuation force), such that the nanomagnets on the membrane attract to and self-align with the nanomagnets on said surface based on the nanomagnet magnetizations.

Abstract: Methods of fabricating a magnetic flux channel for a transverse wound electric motor by forming a ring of plural adjacent molded magnetic flux channel pole pieces and a second ring of opposite pole pieces. The two rings are mated such that each pole piece mates with an opposite pole piece to form magnetic flux channels and a c-shaped recess forms a winding channel for a transverse phase winding. After mating, the rings are bonded together to form a stator assembly of the transversely wound electric motor. The two rings may be approximately identical, or the two rings may be different as long as they mate to form the plural molded magnetic flux channels and the transverse phase winding channel. The molds may be designed to form the outer surface of a stator assembly. Molds of adjacent phases may be combined back-to-back to reduce part count and increase mechanical strength.

Abstract: In a continuous flux path transformer core, at least part of the core is implemented in non-grain oriented steel.

Abstract: There is provided a magnetic field generator (10) and a method of manufacturing it, capable of reducing decline in the magnetic field intensity and deterioration of magnetic field uniformity during transportation. The magnetic field generator (10) includes a pair of plate yokes (12a), (12b). The plate yokes (12a), (12b) are opposed to each other, with their opposing faces provided with permanent magnet assemblies (14a), (14b) respectively. The permanent magnet assemblies (14a), (14b) have faces opposing to each other, to which pole pieces (16a), (16b) are fixed respectively. The permanent magnet assemblies (14a), (14b) include permanent magnets (18). The pole pieces (16a), (16b) include annular projection (24) and permanent magnets (28) for prevention of magnetic flux leakage provided on an outer side surface of the annular projection (24). The permanent magnets (18), (28) include R—Fe—B magnets magnetized to a magnetization rate not smaller than 80% and not greater than 99.9%.

Abstract: A reference point locator comprises a reference member and a receiver. The reference member includes an attachment element and a magnet. The attachment element is configured to releasably secure the reference member to one side of a structure. The receiver includes a sensor and an indicator. The indicator is configured to emit a signal in response to the sensor detecting from another side of the structure a magnetic field generated by the magnet.

Abstract: To realize an anisotropic bonded magnet that reduces cogging torque without lowering output torque. The present invention provides a hollow cylindrically shaped anisotropic bonded magnet for use in a 4-pole motor, formed by molding anisotropic rare-earth magnet powder with resin. The alignment distribution of the anisotropic rare-earth magnet powder in a cross section perpendicular to the axis of the anisotropic bonded magnet is in the normalized direction of the cylindrical side of the hollow cylindrical shape in the main region of a polar period, and in a transition region in which the direction of the magnetic pole changes, steadily points towards a direction tangential to the periphery of the cylindrical side at points closer to the neutral point of the magnetic pole, and becomes a direction tangential to the periphery of the cylindrical side at that neutral point, and steadily points toward the normalized direction of the cylindrical side at points farther away from the neutral point.

Abstract: A method for manufacturing a rotor assembly. The method includes providing a stub shaft having a first part and a second part, providing a magnet between the first part and the second part, and compressing the magnet between the first part and the second part using a connecting device. The method also includes drilling a hole through the first part and the magnet, cooling an inner shaft, and inserting the inner shaft into the hole.

Abstract: A magnetic field generating member with high stiffness and small size, an image development device, a process cartridge and an image forming apparatus including the magnetic field generating member as well as a manufacturing method of the magnetic field generating member are provided where the magnetic field generating member includes a main body, a groove provided in the main body, an interposition member configured to be fitted in the groove of the main body and including a concave portion and a magnetic member as a long magnetic compact fixed into the concave portion of the interposition member.