WO2004077647A1 - リング型磁石及びその製造方法 - Google Patents
リング型磁石及びその製造方法 Download PDFInfo
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- WO2004077647A1 WO2004077647A1 PCT/JP2003/013817 JP0313817W WO2004077647A1 WO 2004077647 A1 WO2004077647 A1 WO 2004077647A1 JP 0313817 W JP0313817 W JP 0313817W WO 2004077647 A1 WO2004077647 A1 WO 2004077647A1
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- WIPO (PCT)
- Prior art keywords
- ring
- shaped
- preform
- magnet according
- shaped preform
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
- H01F41/0253—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing permanent magnets
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K15/00—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
- H02K15/02—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies
- H02K15/03—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies having permanent magnets
Definitions
- the present invention relates to a ring magnet used for a rotor of a motor, etc.
- a ring-shaped permanent magnet molding method involves filling a mold cavity with powder for magnet material molding, and applying a magnetic field to the powder for magnet material molding using a pair of coils arranged around the mold. Press processing is performed while performing orientation.
- a cavity is formed in a lower mold composed of a core, a lower punch, and a die into which the core and the lower punch are inserted, and an upper punch disposed opposite to the die and the lower punch removes the magnetic powder in the cavity. Apply pressure.
- the magnetic flux passing through the core of the mold that forms the magnetic powder into a ring shape is generally equal to the magnetic flux passing through the inner diameter of the die.
- Dia) is D i
- the outer diameter of the ring magnet (die inner diameter) is D o
- the height of the ring magnet (die height) is H
- the magnetic flux density passing through the core of the die is B c
- Pass through the inner diameter of the die Assuming that the magnetic flux density is Bd, the following equation (1) holds.
- the axial length of the ring-shaped magnet is
- a method has been proposed in which a preformed body is formed by magnetic field forming, and a plurality of preformed bodies are integrated by pressing with a pressing force larger than the pressing force at the time of the preforming.
- Conventional radial anisotropic ring magnets are manufactured by shaping magnets with a short axial length oriented in the radial direction as described above, joining them with an adhesive, etc., and stacking them to produce a ring magnet with the required axial length.
- the productivity is poor, and the outer diameter accuracy is deteriorated due to the deviation of the center axis of each stacked magnet, etc., and the air gap when combined with the stay is uneven.
- the shape accuracy was deteriorated due to the assembling, and the magnetic characteristics were deteriorated.
- the first molded magnet is repeatedly subjected to pressurization, and the number of pressurizations differs between the first molded magnet and the last molded magnet. This causes the problem of deformation during sintering.
- a larger forming equipment for re-pressing is required in the method of forming a pre-formed body and pressing and integrating a plurality of pre-formed bodies with a pressing force larger than the pressing force at the time of the pre-forming. There is a problem if it becomes necessary and the preformed body is easily damaged during re-pressing. .
- the present invention has been made in order to solve the above-mentioned problems, and there is little decrease in magnetic properties due to orientation disorder near a lamination interface of a stacked ring-shaped preform, and the productivity is good and the shape accuracy is good. It is an object of the present invention to provide a ring-shaped magnet that can be manufactured and a method for manufacturing the same. Disclosure of the invention
- a first ring-shaped magnet according to the present invention is obtained by stacking a plurality of radially oriented ring-shaped preformed bodies in an axial direction to form a ring-shaped formed body, and sintering the ring-shaped formed body.
- a concave portion is formed on one end surface of the both ends in the axial direction of the ring-shaped preform, and a convex portion is formed on the other end surface. The concave portion and the convex portion of the ring-shaped preform adjacent to each other in the axial direction are fitted.
- the center axis of each ring-shaped preform can be easily adjusted, a product having good shape accuracy can be obtained, and displacement during transport can be prevented.
- the concave portions and the convex portions have the end faces formed in an arc shape.
- each ring-shaped preform can be easily adjusted by fitting the concave portion and the convex portion formed in the V-shape, and a product having good shape accuracy can be obtained. It is possible to prevent deviation during transport.
- the concave portion and the convex portion are formed by providing a step between the inner periphery and the outer periphery of the end face.
- the center axis of each ring-shaped preform can be easily adjusted, and a product having good shape accuracy can be obtained.
- the preforms can be stacked Preforms can be stacked accurately without damaging the preforms.
- the concave portion and the convex portion are formed by providing an inclination between the inner periphery and the outer periphery of the end face.
- each ring-shaped preform can be easily adjusted by fitting the inclination between the inner circumference and the outer circumference of the end face, and a product having good shape accuracy can be obtained. In addition, it is possible to prevent deviation during transport.
- the concave and convex portions are a plurality of spherical objects formed at predetermined intervals in a circumferential direction.
- each ring-shaped preform can be easily adjusted by fitting the convex spherical shape object and the concave spherical shape object, and a product having good shape accuracy can be obtained. In addition, it is possible to prevent deviation during transport.
- the cross section of the concave portion and the convex portion has an arc shape, a V shape, a U shape, or a trapezoid.
- each ring-shaped preform is formed by fitting a convex arc, V-shape, U-shape or trapezoid with a concave arc, V-shape, U-shape or trapezoid.
- the center axis of can be easily adjusted, and a product with good shape accuracy can be obtained, and the displacement at the time of conveyance can be prevented.
- the concave portion and the convex portion are formed in a ring shape along the end face.
- the central axis of each of the ring-shaped preforms can be easily adjusted by fitting the convex ring-shaped formation portion and the concave ring-shaped formation portion, so that the shape accuracy is good. And the displacement during transportation can be prevented.
- a plurality of the concave portions and the convex portions are formed in a radial direction of the ring-shaped preform. According to this, by fitting a plurality of convex portions and concave portions formed in the radial direction, the center axes of the respective ring-shaped preforms can be easily aligned, and a product having good shape accuracy can be obtained. In addition to this, it is possible to prevent displacement during transport.
- the one end face on which the recess is formed is further provided with the protrusion, and the other end face on which the protrusion is formed is further provided with the recess. It has been formed.
- each ring-shaped preform can be easily adjusted by fitting a plurality of formed convex portions and concave portions in the radial direction, and a product having good shape accuracy can be obtained. In addition, it is possible to prevent deviation during transport.
- the uppermost upper end surface and the lowermost lower end surface of the ring-shaped preform are flat surfaces on which the concave portions and convex portions are not formed.
- the ring-shaped molded body can be kept in a stable state during mounting and transport, and the shaft length can be shortened.
- a first method for manufacturing a ring-shaped magnet according to the present invention includes a step of forming a plurality of radially oriented ring-shaped preforms, and stacking the ring-shaped preforms in the axial direction. And a step of sintering the ring-shaped molded body.
- pressure is applied at a pressure of 50 MPa or less in a direction in which the ring-shaped molded bodies are stacked. According to this, the close contact between the ring-shaped preforms can be ensured.
- the step of forming a ring-shaped molded body includes:
- a die a core inserted into the die to form a ring-shaped space between the die, and a lower punch for closing a lower portion of the space to form a cavity in which magnetic powder is supplied and filled,
- An upper punch for pressurizing the magnetic powder supplied into the cavity is provided, and a plurality of transportable dies are sequentially placed in the cavity.
- the tact time can be shortened, and a ring-shaped magnet with small deterioration of magnetic properties at the boundary between the ring-shaped preforms can be manufactured with high productivity.
- a fourth method of manufacturing a ring-type magnet according to the present invention includes a step of measuring a fixed amount of magnetic powder to be supplied to the cavity.
- the height of the ring-shaped preform becomes constant, and it is possible to prevent an unnecessary force or an impact force from being applied to the ring-shaped preform during stacking. it can.
- a fifth method of manufacturing a ring-type magnet according to the present invention includes a step of moving the upper punch onto the cavity and inserting the upper punch. According to this, after supplying and filling the magnetic powder into the cavity, the mold can be set in a state where the magnetic powder in the cavity can be pressurized by the upper punch.
- a fifth method of manufacturing a ring-shaped magnet according to the present invention in the step of extracting the ring-shaped preform from the transfer mold, the ring-shaped preformed body is extracted from the die while pressing.
- a sixth method for manufacturing a ring-shaped magnet according to the present invention is a method for removing the magnetic powder adhered to the ring-shaped preformed body during the step of extracting the ring-shaped preformed body from the transfer mold. is there.
- a seventh method of manufacturing a ring-shaped magnet according to the present invention in the step of laminating the ring-shaped preform extracted from the transfer mold in a plurality of stages in the axial direction, They are stacked around a central axis.
- the ring-shaped preform has a bias in the magnetic properties in the circumferential direction
- the bias of the magnetic characteristics can be canceled.
- An eighth method of manufacturing a ring-shaped magnet according to the present invention is characterized in that, in the step of laminating the ring-shaped preform extracted from the transfer die in a plurality of stages in the axial direction, the end face in the axial direction at the time of molding is inverted. Then, the ring-shaped preform is laminated.
- FIG. 1 is a perspective view showing an example of a ring magnet obtained by molding and sintering with the permanent magnet molding apparatus of the present invention.
- FIG. 2 is a plan view showing a configuration of the permanent magnet forming apparatus according to Embodiment 1 of the present invention.
- FIG. 3 shows the configuration of the transfer mold in FIG. 2, wherein (a) is a plan view and (b) is a cross-sectional view along AA.
- FIG. 4 is a cross-sectional view illustrating the powder feeding / filling unit and its operation.
- FIG. 5 is a cross-sectional view illustrating the configuration and operation of the punch set unit.
- FIG. 6 is a cross-sectional view illustrating the configuration and operation of a magnetic field forming unit.
- FIG. 7 is a cross-sectional view illustrating the structure of a pressurizer.
- FIG. 8 is a plan view (a), (c), an AA sectional view (b), and a BB sectional view (d) showing the configuration of the back core.
- FIG. 9 is a cross-sectional view showing a state of magnetic flux in radial orientation.
- FIG. 10 is a plan view (a) and a cross-sectional view taken along line AA (b) showing the configuration of the detachable unit.
- FIG. 11 is a cross-sectional view for explaining the operation of the demolding unit.
- FIG. 12 is a cross-sectional view for explaining the configuration and operation of the molded body dedusting unit.
- FIG. 13 is a cross-sectional view for explaining the configuration and operation of the compact dedusting unit.
- FIG. 14 is a cross-sectional view for explaining the configuration and operation of the stacking unit.
- FIG. 15 is a cross-sectional view for explaining the configuration and operation of the stacking unit.
- FIG. 16 is a cross-sectional view for explaining the configuration and operation of the stacking unit.
- FIG. 17 is a view showing a step of stacking the formed bodies 13 of each stage in a state of being rotated by an arbitrary angle.
- FIG. 18 is a cross-sectional view showing a state in which the axial end faces of the ring-shaped preform are vertically inverted and stacked.
- FIG. 19 is a perspective view (a) and a cross-sectional view (b) showing a ring-shaped molded body according to Embodiment 2 of the present invention.
- FIG. 20 is a plan view and an AA cross-sectional view (b) showing the ring-shaped preform in FIG.
- FIG. 21 is a cross-sectional view for explaining a magnetic field forming method of a ring-shaped preform.
- FIG. 22 is a plan view (a), an AA cross-sectional view (b), and a ring-shaped preformed body showing a ring-shaped formed body of another shape according to Embodiment 2 of the present invention.
- the sectional views (c), (d) and (e) are shown.
- FIG. 23 is a plan view (a) showing a ring-shaped preform in Embodiment 3 of the present invention and a cross-sectional view A-A (b) of the preform, and a cross-sectional view (c) showing the ring-shaped preform. is there.
- FIG. 24 is a cross-sectional view showing another shaped ring-shaped molded product according to Embodiment 3 of the present invention.
- FIG. 25 is a plan view (a) and an A-A cross-sectional view (b) showing a ring-shaped preform in Embodiment 4 of the present invention, and a cross-sectional view (c) showing the ring-shaped preform. is there.
- FIG. 26 is a cross-sectional view showing another shaped ring-shaped molded product according to Embodiment 4 of the present invention.
- FIG. 27 is a plan view (a) showing a ring-shaped preform according to Embodiment 5 of the present invention, and a cross-sectional view A-A (b) showing the ring-shaped preform, and a cross-sectional view (c) showing the ring-shaped formed body. is there.
- FIG. 28 is a cross-sectional view showing another shaped ring-shaped molded product according to Embodiment 5 of the present invention.
- FIG. 29 is a plan view (a) and an A-A cross-sectional view (b) showing a ring-shaped preform according to Embodiment 6 of the present invention, and a cross-sectional view (c) showing the ring-shaped preform. is there.
- FIG. 30 ′ is a cross-sectional view showing another shaped ring-shaped molded product according to Embodiment 6 of the present invention.
- FIG. 31 is a plan view (a) and an AA cross-sectional view (b) showing a ring-shaped preform according to Embodiment 7 of the present invention, and a cross-sectional view (c) showing the ring-shaped preform. is there.
- FIG. 32 is a cross-sectional view showing another shaped ring-shaped molded product according to Embodiment 7 of the present invention.
- FIG. 33 is a plan view (a) and a side view (b) showing a ring-shaped preformed body according to Embodiment 8 of the present invention, and a side view (c) showing a ring-shaped formed body. .
- FIG. 34 is a cross-sectional view showing another shaped ring-shaped molded product according to Embodiment 8 of the present invention.
- FIG. 35 is a plan view (a) and a side view (b) showing the ring-shaped preform in Embodiment 9 of the present invention, and a side view (c) showing the ring-shaped preform.
- FIG. 36 is a cross-sectional view showing a ring-shaped formed body of another shape according to Embodiment 9 of the present invention.
- FIG. 37 is a plan view (a) and a side view (b) showing a ring-shaped preform according to Embodiment 10 of the present invention, and a side view (c) showing the ring-shaped preform.
- FIG. 38 is a cross-sectional view showing a ring-shaped formed body of another shape according to Embodiment 10 of the present invention.
- FIG. 39 is a plan view (a) and a side view (b) showing a ring-shaped preform according to Embodiment 11 of the present invention, and a side view (c) showing the ring-shaped preform.
- FIG. 40 is a cross-sectional view showing a ring-shaped molded body of another shape according to Embodiment 11 of the present invention.
- FIG. 1 is a perspective view showing an example of a ring-shaped magnet obtained by molding and sintering by the method for manufacturing a ring-shaped magnet of the present invention
- FIG. FIG. 3 is a plan view showing the configuration of a magnet forming apparatus used in the method of manufacturing the ring-shaped magnet in state 1
- FIG. 3 shows the configuration of the transfer mold in FIG. 2
- (a) is a plan view
- (b) is It is A-A sectional drawing.
- a ring-shaped magnet 1 formed and manufactured by the magnet forming apparatus of the present invention is a ring preformed body 1a formed into a cylindrical shape as shown in FIG. 1 (a). Rings obtained by laminating and sintering, or having irregularities on the peripheral surface as shown in Fig. 1 (b) (including those with irregularities on the outer peripheral surface but concave and convex on the inner peripheral surface in the figure) Ring It is obtained by laminating and sintering the preform 1a.
- the ring-shaped magnet 1 obtained by laminating the short-axis ring-shaped preforms 1a and sintering the magnetic preforms at the boundary between the ring-shaped preforms 1a has a small deterioration.
- a ring magnet 1 having a large amount of magnetic flux is better.
- the magnet forming apparatus measures magnetic powder in a belt conveyor 2 that conveys a transfer mold 10 and a ring-shaped cavity of the transfer mold 10.
- Punch set to set the magnetic powder in the cavity of the transfer mold 10 filled with magnetic powder in a state where the upper punch can be press-molded for pressurizing
- a unit 4 a magnetic forming unit 5 for performing magnetic field pressing of the magnetic powder of the transfer mold 10 in which the upper punch is set and can be pressed, and a ring-shaped preforming formed by magnetic pressing
- a demold unit 6 for removing the body from the transfer mold 10
- demolding unit 7 for removing excess magnetic powder adhering to the extracted ring-shaped preform, and a magnetic field application.
- the transfer mold 10 includes a pallet 10 a that moves on the belt conveyor 2 and a holder (a first holder 1) 10 b, 10 that holds a lower mold part. c, a columnar core 10d, a lower punch 10e, and a core 10d at the center, and the lower punch 10e and the core 10d provide a cavity 10h to which the magnetic powder is supplied.
- the holder 10b is a ferromagnetic member
- the holder 10c is a non-magnetic member.
- the position and direction of the pallet 10a and holders 10b and 10j, holder 10b and lower punch 10e, and lower punch 10e and die 10f are determined by positioning mechanisms using positioning pins. Is regulated.
- the transfer mold 10 is transferred to the powder feeding and filling unit 3 by the belt conveyor 2.
- FIG. 4 is a cross-sectional view illustrating a powder feeding / filling unit and its operation.
- FIG. 4 (a) shows a step of measuring the magnetic powder
- FIGS. 4 (b) and (c) show a step of supplying powder to the transfer mold 10.
- the filling unit 3 is a feeding mechanism that measures the magnetic powder 3d and transports the magnetic powder 11 that has been weighed and collected in the container 3c. And a transport mechanism 3e for transporting the sheet to a predetermined position.
- the powdering and filling unit includes a rotating mechanism 3f for rotating and tilting the container 3c, and a magnetic powder 11 in the container 3c in the cavity 10h.
- a powder feeding jig 3a for guiding
- a vibration mechanism 3b including a vibrator or the like for vibrating the powder feeding jig 3a.
- the height of the ring-shaped molded product to be molded can be made constant as described later, thereby preventing breakage in the laminating step. Can be.
- the magnetic powder 11 was supplied to the powder supply jig 3a and the cap 10h on the funnel that led to the cavity 10h of the transfer mold 10.
- a feather jig (not shown) for stirring magnetic powder is set on the die 10 f of the transport jig 10, and then the container 3 c containing the magnetic powder 11 is placed in a rotatable feeding jig. Move to the position of 3a, rotate and tilt the container 3c, and transfer the magnetic powder 11 in the container 3c to the funnel-shaped feeding jig 3a.
- a shock is applied to the container 3c with a knocker, and the magnetic powder 11 in the container 3c is completely transferred to the funnel-shaped powder supply jig 3a.
- vibration is applied to the funnel-shaped powder supply jig 3a by the vibration mechanism 3b to transfer all the magnetic powder on the powder supply jig 3a into the cavity 10h, and Rotate the wings, stir the magnetic powder 11 in the cavity 10 h, raise the wings, and uniformly fill the cavity with the magnetic powder 11.
- the magnetic powder 11 in the cavity is in the magnetic powder.
- the cavity or the bridge of magnetic powder is broken, and the magnetic powder is uniformly filled in the capity.
- FIG. 5 is a cross-sectional view illustrating the configuration and operation of the punch set unit.
- the punch set unit is provided with a hand 4a for catching the upper punch 10g, and a moving mechanism for moving the hand 4a up and down and moving the catched upper punch 10g. I have.
- the transfer mold can be set so that the magnetic powder in the cavity can be pressurized with the upper punch 10 g.
- each part of the transfer mold 10 is used in the pressurized magnetic field molding in the next step. There is no need for a mechanism to position the robot with high accuracy.
- the pallet 10a is transported to the stage of the punch set unit 4, and when the pallet 10a is positioned at the specified position, the hand 4a is lowered as shown in FIG. 5 (b).
- the hand 4a lifts the upper punch 10g and moves it toward the lower die as shown in Fig. 5 (d), catching the upper punch 10g as shown in Fig. 5 (c). Then, it descends, inserts the upper punch 10 g into the core 10 d, releases the upper punch 10 g, and the upper punch 10 g fits into the cavity.
- the diameter of the upper end of the core 10d is 0.2 mm smaller than the diameter in the cavity, and a taper of 3 ° is provided. Even if there is a deviation of less than mm, there will be no defect that the punch 10 g cannot be inserted into the core 10 d.
- the hand 4a releases the upper punch 10g, and then moves up to the original position.
- the transfer mold 10 on which the upper punch 10 g is set is transferred to a predetermined position of the magnetic field forming unit 5 by the belt conveyor 2.
- FIG. 6 is a cross-sectional view illustrating the configuration and operation of the magnetic field forming unit
- FIG. 7 is a cross-sectional view illustrating the structure of the pressurizer
- FIG. 8 is a configuration of the back core It is a top view (a), (c) and AA sectional drawing (b), (d).
- the magnetic field forming unit 5 transfers the mold portion of the transfer mold 10 on which the upper punch 10 g is set from the pallet 10 a on the belt conveyor 2 to the magnetic field forming unit 5. It has a transfer mechanism 5h for transferring and returning to the pallet 10a on the belt conveyor 2 after magnetic field forming.
- FIG. 2 is a cross-sectional view illustrating the configuration and operation of the magnetic field forming unit
- FIG. 7 is a cross-sectional view illustrating the structure of the pressurizer
- FIG. 8 is a configuration of the back core It is a top view (a), (c) and AA sectional drawing (b), (d).
- the magnetic field forming unit 5 transfers
- the magnetic field forming unit 5 includes an electromagnetic coil 5a (fixed to a frame) for generating an orientation magnetic field for orienting the magnetic powder, an upper electromagnetic coil 5a and an upper punch.
- a compression molding mechanism 5b that raises and lowers a pressurizer 5c that pressurizes 10 g, a ring-shaped elastic member 5j, and a back yoke 5d that is driven by an air cylinder (not shown) and contacts the die 10f.
- the pressurizing element 5c includes a punch pressurizing section 5e that presses the upper punch, a movable rod 5f that is movable to be recessed inside the punch pressurizing section 5e, and a movable rod 5c.
- a spring 5 g is provided between the back surface of f and the inner surface of the punch pressurizing section 5 e and presses the movable rod 5 f against the core 10 d.
- the back yoke 5d is one ferromagnetic material having a semicircular concave portion that fits the outer diameter of the die 10f.
- the back yoke 5d is installed so that the center of its thickness coincides with the center position of the thickness of the die 10f, and moves in the direction of the die 10f to abut.
- the transfer mold 10 When the transfer mold 10 is transferred from the punch set unit 4 to the magnetic field forming unit 5 by the belt conveyor 2, the mold section is transferred together with the holder 10b as shown in FIG. 6 (a). It is transferred from the pallet 10a to the forming part of the magnetic field forming unit 5 by the mechanism 5h (see Fig. 2).
- the compression molding mechanism 5b operates, the electromagnetic coil 5a and the pressurizer descend, and the upper and lower frames are fixed by the chucking function.
- the die 10f is fixed by the ring-shaped elastic member 5j attached to the lower part of the upper frame.
- the back yoke 5d moves from both sides of the die 10f and comes into close contact with the outer periphery of the die 10f.
- a current is passed through the electromagnetic coil 5a to generate a radially oriented magnetic field, and at the same time, the pressurizer 5c is lowered, and the upper punch 5g is pressed, as shown in FIG. 6 (c).
- a 5 g punch press-molds the magnetic powder in the cavity to obtain a radially oriented compact.
- the compression molding pressure is 10 to 100 MPa, preferably 40 MPa, and the orientation magnetic field is 1 T or more.
- FIG. 9 is a cross-sectional view showing the state of magnetic flux in radial orientation.
- the magnetic field generated by the upper coil 5a turns into a magnetic flux, passes through a ferromagnetic pressurizer 5c, enters a movable rod 5f, which is also a ferromagnetic material, and forms a lower coil 5a.
- the magnetic field generated in step 1 enters core 10d through holder 11 Ob, which is a ferromagnetic material (see FIG. 6).
- the lower punch 10e and the upper punch 10g are non-magnetic materials.
- the magnetic flux indicated by the dashed arrow passes through the movable rod 5f, which is a ferromagnetic material, and the core 10d, and passes through the cavity 10h of the die 10, which is a ferromagnetic material.
- a radially oriented magnetic field is formed in the cavity 10 h along the diameter direction.
- the radially oriented ring-shaped preform is returned to the pallet 10a together with the mold part and the holder 10b by the transfer mechanism 5h.
- the transfer mold including the ring-shaped preform is transferred to a predetermined position of the demold unit 6 by the belt conveyor 2.
- FIG. 10 is a plan view (a) and an A-A cross-sectional view (b) showing the configuration of the detachable unit.
- the demolding unit comprises a molded body pressing mechanism constituted by an air cylinder 6a for pressing the ring-shaped preformed body 13 and an upper punch abutting portion 6d; It has a die lifting mechanism consisting of a table 6c that pushes f upward and an air cylinder 6b. -] 9-Yes.
- FIG. 11 is a cross-sectional view for explaining the operation in the removal unit.
- the air cylinder 6a lifts the pallet 10a, the upper punch 10g hits the upper punch butting portion 6d, and the ring-shaped preform 13 is applied. Pressed. The applied pressure is 0.1 to 1 MPa.
- the air cylinder 6b operates, the table 6c lifts the die 10f, and the ring-shaped spare The molded body 13 is extracted from the die 10 f.
- the air cylinder 6a descends, and the pallet 10a rides on the belt conveyor 2.
- the knurls 10 & are moved to separate holders 10 on the pallets 10a when the dies 10f supported by the tables 6c are lowered.
- the table press cylinder 6b operates, the table 6c descends, and the die 10f is placed on the holder 10j as shown in Fig. 11 (d). Is placed.
- the transfer mold 10 is transferred to a predetermined position of the compact dedusting unit 7 by the belt conveyor 2.
- the compact body dedusting unit consists of a lifting mechanism consisting of a table 7a and an air cylinder 7b for raising and lowering the table 7a, a nozzle 7c for injecting nitrogen gas, and a magnetic powder suction It is provided with a dust suction duct 7d for collection in a dust collector.
- the pallet 10a stops at a predetermined position, the air cylinder 7b operates and the table 7a rises, and as shown in FIG. 12 (b).
- the lower core 10e rises while being supported by the table 7a, and the ring-shaped preform 13 is extracted from the core 10d.
- the upper punch 10 g is also extracted at the same time and placed on another holder 10 j (see FIG. 3).
- the ring-shaped preform 13 is transferred to the stacking unit 8 by the transfer mechanism 12 together with the holder 10b, the core 10d, and the lower punch.
- FIG. 14, FIG. 15 and FIG. 16 are cross-sectional views for explaining the configuration and operation of the stacked units.
- the stacking unit includes a hand 8 as a mechanism for chucking the ring-shaped preform 13. a, a table 8 b for laminating the ring-shaped preform 13, and a mechanism for positioning, elevating and moving the hand 8 a, and a rotation of a motor or the like for rotating the table 8 b although not shown.
- Mechanism is a hand 8 as a mechanism for chucking the ring-shaped preform 13. a, a table 8 b for laminating the ring-shaped preform 13, and a mechanism for positioning, elevating and moving the hand 8 a, and a rotation of a motor or the like for rotating the table 8 b although not shown.
- the hand 8a was moved to a position directly above the ring-shaped preform 13 extracted from the core 10d, and as shown in FIG. 14 (b). Then, the hand 8a is lowered and the ring-shaped preform 13 is chucked by the hand 8a.
- the chucking force shall be 0.1 to 4 N.
- the hand 8a is raised, and as shown in FIG. 15 (a), the hand 8a is moved so that the center thereof is directly above the rotation center of the table 8b. As shown in Fig. (B), the hand 8a is lowered to place the ring-shaped preform 13 on the table 8b. At this time, the center of the ring-shaped preform 13 coincides with the rotation center of the table 8b.
- the second-stage and third-stage ring-shaped preforms are placed on the first-stage ring-shaped preform 13. 13 are laminated, and this laminating step is repeated to laminate the ring-shaped preforms 13 by the required number of stages.
- the height of the ring-shaped preform 13 varies, and when the height increases, unnecessary pressure is applied to the ring-shaped preform 13 during stacking, and the ring-shaped preform 13 is crushed.
- the hand 8a releases the ring-shaped preformed body 13 in the air, and when the hand 8a is broken by the impact of dropping, a sudden occurrence occurs, but in this embodiment, the ring-shaped preformed body is formed once. Since the weight of the preform 13 is measured to a constant amount in the step of measuring the magnetic powder of the powder feeding and filling unit 3 shown in FIG. 2, the height of the ring-shaped preform 13 is kept constant. No unnecessary force or impact force is applied to the ring-shaped preform 13 during stacking.
- FIG. 17 shows that the ring-shaped preform 13 of each stage is rotated by an arbitrary angle.
- FIG. 17B is a view showing a stacking process.
- FIG. 17 (a) the A position of the first-stage ring-shaped preform 13 is shown in FIG. 17 (b).
- the table 8b is rotated to invert the position A by 180 °, and the second-stage ring-shaped preform 13 is laminated.
- FIG. 17 (c) the table 8b is rotated by 90 ° and the third-stage ring-shaped preform 13 is laminated, and as shown in FIG. 17 (d). As such, 180 more.
- the fourth-stage ring-shaped preform 13 is laminated.
- the deviated magnetic properties can be canceled.
- FIG. 18 is a cross-sectional view showing a state in which an axial end face is turned upside down and stacked in every other stage when the ring-shaped preform is formed.
- the magnetic properties of the ring-shaped preform 13 may have, for example, a gradient on the upper punch side and the lower punch side, and a steep change in the magnetic properties may occur at the junction of each stage.
- the axial end face of the ring-shaped preform 13 was inverted and the lower surface was set to the upper punch side, and in the second stage, the lower surface was set to the lower punch side without being inverted, and was sequentially inverted.
- Fig. 18 shows a case where the axial end face of the ring-shaped preform is formed upside down at every other stage and stacked, but only the upper stage produces a magnetic characteristic gradient. , When only the lower stage produces a gradient in magnetic characteristics For example, the same effect can be obtained by reversing the axial end face of only the step at the time of molding and laminating.
- a rotary actuator is provided on the chuck portion of the hand 8 a shown in FIGS. 14 to 16.
- the mold sections 10d and 10e and the holder 10b are returned to the pallet 10a by the transfer mechanism 12 and the mold is subjected to the next step. It is transported to the mold set unit 9.
- Mold dedusting Z mold set unit 9 has a powder removal mechanism that removes magnetic powder adhering to the transfer mold 10 and a magnetic powder can be supplied to the powder supply and filling unit 3 so that the transfer metal can be returned to the initial state. And a setting mechanism for setting each part of the mold 10.
- the powder removing mechanism has a nozzle capable of injecting nitrogen gas into each part of the transfer mold 10 (having a mechanism for moving it to each part of the transfer mold 10), and sucks magnetic powder blown off by the nitrogen gas. And a suction mechanism for collecting dust.
- the powder removing mechanism and the setting mechanism By the powder removing mechanism and the setting mechanism, the processes up to the forming and stacking of the next cycle can be performed smoothly.
- the setting mechanism lifts the die 10f placed on the holder 10j shown in Fig. 3 and lifts the lower punch 10e placed on the holder 10b. It is a mechanism to move it up.
- the cylindrical shaped body on which the ring-shaped preformed bodies 13 are stacked is transferred to a sintering / heat treatment furnace, where it is sintered / heat treated at a predetermined temperature, and then subjected to finishing as required.
- the ring magnet 1 shown in the figure is obtained.
- a plurality of transfer dies 10 are simultaneously transferred to the belt conveyor 2 using the belt conveyor 2.
- the process for producing short-axis ring-shaped preforms is processed at each unit provided at each location, and the required number of ring-shaped preforms are stacked (laminated), reducing tact time.
- FIG. 19 is a perspective view (a) and a cross-sectional view (b) showing a ring-shaped formed body obtained by laminating the ring-shaped preformed body according to Embodiment 2 of the present invention.
- FIG. FIG. 2 is a plan view and an AA cross-sectional view (b) showing a ring-shaped preform in FIG.
- the ring-shaped molded product lb is formed by stacking a plurality of radially oriented ring-shaped preformed products 1a (three stages shown). It is formed by forming
- each ring-shaped preform 1a has a concave portion 1c formed over the entire periphery of one end surface, and a convex portion 1e formed over the entire periphery of the other end surface.
- each ring-shaped preform 1a is connected and integrated at a fitting portion 1d where a convex portion 1e fits into a concave portion 1c as shown in FIG. 19 (b). Therefore, the center axis of each ring-shaped preform 1a can be easily adjusted.
- FIG. 21 is a cross-sectional view for explaining a magnetic field forming method of the ring-shaped preform in this embodiment.
- the mold includes a die 10 ⁇ ⁇ ⁇ made of a ring-shaped ferromagnetic material made of steel or a super hard material, a core 10d made of steel or the like, a nonmagnetic stainless steel or Equipped with upper and lower punches 10 g and 10 e made of carbide material, one end of the upper and lower punches 10 g and 10 e has an arc-shaped convex shape, and the other end has a convex arc radius. It is a concave shape having the same arc shape.
- a cavity 10h is formed between the outer peripheral surface of the upper and lower end punches 10g and 10e inserted between the two.
- An electromagnetic coil 5a is provided on both sides of the core 10d.
- an orientation magnetic field indicated by a broken arrow passing through the upper and lower cores 10d and the die 10f is generated.
- the magnetic powder is supplied to the cavity 10 h, and the magnetic powder is compressed and pressed by the upper and lower punches 10 g and 10 e in a state where the alignment magnetic field is applied.
- a radially oriented ring-shaped preform 1a having the other end face convex is obtained.
- the obtained plurality of ring-shaped preforms 1a are fitted with the concave portions 1c and the convex portions 1e, and are stacked to obtain a ring-shaped molded product 1b.
- the ring-shaped molded body 1b is pressed in the axial direction with a pressure of 50 MPa or less so that the ring-shaped molded product 1b is not damaged, so that it is more securely fixed. Can be integrated.
- heat treatment such as aging treatment can be performed to manufacture a ring-shaped magnet having a long axial length.
- the ring-shaped formed body lb is stacked in a separate step, the ring-shaped preformed body 1a which is individually magnetically formed is stacked in a separate process, so that the ring-shaped formed body lb is stacked while being magnetically formed in a mold.
- a ring-shaped magnet with good magnetic properties can be obtained without causing radial disturbance at the lamination boundary.
- a plurality of ring-shaped preforms having a concave portion 1c formed on one end surface of the ring-shaped preform 1a, a convex portion 1e formed on the other end surface, and a concave portion 1c and a convex portion 1e formed. Since the compact 1a is fitted and integrated with the concave 1c and the convex 1e, the center axis of each ring-shaped preform 1a can be easily adjusted. As a result, a product having good shape accuracy can be obtained, and a deviation at the time of conveyance can be prevented.
- the uppermost and lowermost ring-shaped preforms 1a to be laminated are provided with a concave portion 1c and a convex portion 1e at both end surfaces, but the uppermost and lowermost surfaces of the uppermost and lowermost stages are By making it flat, the overall length of the ring-shaped molded body 1 can be shortened.
- Fig. 22 is a plan view (a) showing the ring-shaped preform 1b with the upper end surface and the lower end surface flat at the uppermost and lowermost stages, and a sectional view taken along the line AA (b).
- (c), (d) and (e) are sectional views of the ring-shaped preform 1a.
- the upper end surface of the uppermost ring-shaped preform 1 a (c) is made flat, and the upper and lower end surfaces of the intermediate ring-shaped preform 1 a (b) are provided with a concave portion 1 c and a convex portion 1.
- e is formed, and the lower end surface of the lowermost ring-shaped preform la (e) is flattened.
- the shaft length can be shortened, and the installation / transport state can be stabilized.
- FIG. 23 is a plan view (a) showing a ring-shaped preform according to Embodiment 3 of the present invention, and a cross-sectional view (A) of FIG.
- FIG. 24 is a cross-sectional view showing a ring-shaped formed body having another shape according to Embodiment 3 of the present invention, and the same reference numerals as those in FIG. 19 indicate the same or corresponding parts.
- the concave and convex portions are arc-shaped.
- the ring-shaped preform 1a The concave portion 1c and the convex portion 1e have the same V-shape, and as shown in FIG. 23 (c), a plurality of ring-shaped preforms are formed at the fitting portion 1d.
- the ring-shaped molded body 1b is manufactured by fitting the concave portion 1c of 1a and the convex portion 1e.
- the upper end surface of the uppermost ring-shaped preform 1a and the lower end surface of the lowermost ring-shaped preform 1a are flattened to form the ring-shaped preform. Not only can the overall length of 1b be shortened, but also the installation and transport conditions can be stabilized.
- FIG. 25 is a plan view (a) and an A-A cross-sectional view (b) showing a ring-shaped preform according to Embodiment 4 of the present invention, and a cross-sectional view (c) showing a ring-shaped preform.
- FIG. 26 is a cross-sectional view showing a ring-shaped formed body having a different shape according to Embodiment 4 of the present invention, and the same reference numerals as those in FIG. 19 indicate the same or corresponding parts.
- one end surface of the ring-shaped preform 1a is formed as an inclined surface which is depressed toward the inner peripheral side, so that the concave portion 1 is formed.
- the other end face is formed to have the same inclination angle as the inclination angle of the concave portion 1c which is depressed to the outer peripheral side, thereby forming the convex portion 1e.
- the concave portion 1c and the convex portion 1e of the plurality of ring-shaped preforms 1a are fitted together to form a ring-shaped molded product 1b.Also, as shown in FIG.
- the overall length of the ring-shaped preform 1b can be shortened. As well as being able to stabilize the installation and transport conditions.
- FIG. 27 is a plan view (a) and a cross-sectional view taken along the line AA (b) of the ring-shaped preform according to the fifth embodiment of the present invention, and a ring-shaped preform.
- FIG. 28 is a cross-sectional view showing a ring-shaped molded body having a different shape according to the fifth embodiment of the present invention.
- the same reference numerals as those in FIG. 19 denote the same or corresponding parts. ing.
- one end face of the ring-shaped preform 1a has a ring shape along the circumference and an arc-shaped cross section.
- a concave portion lc is formed, and on the other end surface, a convex portion 1e is formed by forming an arc-shaped projection identical to the arc shape of the concave portion 1c, and FIG. 27 (c)
- the concave portion 1c and the convex portion 1e of the plurality of ring-shaped preforms 1a are fitted at the fitting portion 1d to produce the ring-shaped molded product 1b.
- the upper end surface of the upper ring-shaped preform 1a and the lower end surface of the lowermost ring-shaped preform 1a are flattened to form a ring.
- the total length of the body 1b can be shortened, and the installation and transport state can be stabilized.
- concave portion 1c and the convex portion 1e are not limited to those having an arc-shaped cross section, but may be V-shaped, trapezoidal, or U-shaped.
- FIG. 29 is a plan view (a) and an A-A cross-sectional view (b) showing a ring-shaped preform according to Embodiment 6 of the present invention, and a cross-sectional view (c) showing a ring-shaped preform.
- FIG. 30 is a cross-sectional view showing a ring-shaped formed body having another shape according to Embodiment 6 of the present invention, and the same reference numerals as those in FIG. 19 indicate the same or corresponding parts.
- a step is provided between the inner peripheral side and the outer peripheral side on both end surfaces of the ring-shaped preform 1a.
- a concave portion 1c is formed on the inner peripheral side of the end surface of the boss, and a convex portion 1e is formed on the inner peripheral side of the other end surface.
- the concave portion 1c and the convex portion 1e of the ring-shaped preform 1a are fitted to produce a ring-shaped preform 1b.
- the concave portion and the convex portion of the preform can be easily fitted.
- the upper end surface of the uppermost ring-shaped preform 1a and the lower end surface of the lowermost ring-shaped preform 1a are flattened to form the ring-shaped preform 1a.
- the total length of the body 1b can be shortened, and the installation and transport state can be stabilized.
- Embodiments 2 to 6 the case where the concave portion 1c and the convex portion 1e are formed in a ring shape along the circumference of the ring-shaped preform 1a is shown.
- the part 1e may be formed intermittently.
- FIG. 31 is a plan view (a) and an A-A cross-sectional view (b) showing a ring-shaped preform according to Embodiment 7 of the present invention, and a cross-sectional view (c) showing a ring-shaped preform.
- FIG. 32 is a cross-sectional view showing a ring-shaped formed body having a different shape according to Embodiment 7 of the present invention, and the same reference numerals as those in FIG. 19 indicate the same or corresponding parts.
- FIGS. 31 (a) and (b) four spherical concave portions 1c are formed on one end face of the ring-shaped preform 1a, and A convex portion 1e is formed by forming four spherical protrusions having the same shape as the concave portion 1c on the end face of the fitting portion 1d as shown in FIG. 31 (c).
- the concave portion 1c and the convex portion 1e of the ring-shaped preform 1a are fitted to form the ring-shaped preform 1b.
- the uppermost ring-shaped preform 1 a By making the upper end surface and the lower end surface of the lowermost ring-shaped preform 1a flat, the overall length of the ring-shaped preform 1b can be shortened, and the installation and transport state is stabilized. be able to.
- FIG. 33 is a plan view (a) and a side view (b) showing a ring-shaped preform in Embodiment 8 of the present invention, and a side view (c) showing a ring-shaped preform.
- FIG. 19 is a side view showing a ring-shaped formed body having another shape according to Embodiment 8 of the present invention, and the same reference numerals as those in FIG. 19 indicate the same or corresponding parts.
- a semicircular concave part lc extending in the radial direction is formed on one end face of the ring-shaped preform 1a.
- the upper end surface of the uppermost ring-shaped preform 1a and the lower end surface of the lowermost ring-shaped preform 1a are flattened to form a ring-shaped preform. Not only can the overall length of 1b be shortened, but also the installation and transport conditions can be stabilized.
- FIG. 35 is a plan view (a) and a side view (b) showing a ring-shaped preform according to the ninth embodiment of the present invention, and a side view (c) showing the ring-shaped preform.
- FIG. 19 is a side view showing a ring-shaped formed body having a different shape according to Embodiment 9 of the present invention, wherein the same reference numerals as those in FIG. The corresponding part is shown.
- the shape of the convex portion 1e and the concave portion 1c in the eighth embodiment is a trapezoid extending in the radial direction. It is.
- the upper end surface of the uppermost ring-shaped preform 1a and the lower end surface of the lowermost ring-shaped preform 1a are flattened to form the ring-shaped preform. Not only can the overall length of 1b be shortened, but also the installation and transport conditions can be stabilized.
- FIG. 37 is a plan view (a) and side views (b) and (c) showing a ring-shaped preformed body according to Embodiment 10 of the present invention, and a side view (d) showing a ring-shaped formed body.
- Fig. 38 is a side view showing a ring-shaped molded body of another shape according to the tenth embodiment of the present invention, and the same reference numerals as in Fig. 19 indicate the same or corresponding parts.
- a semicircular arc extending in the radial direction is provided on one end face of the ring-shaped preform 1a.
- the convex portions 1e and the concave portions 1c are alternately formed at 90 ° intervals, and the semi-circular concave portions 1c and the convex portions 1e of the same shape are alternately formed at 90 ° intervals on the other end face.
- the concave portion 1c and the convex portion 1e of the plurality of ring-shaped preforms 1a are fitted at the fitting portion 1d to form the ring-shaped compact lb. We are making. .
- the uppermost ring-shaped preform 1 a By flattening the upper end surface and the lower end surface of the lowermost ring-shaped preform 1a, the overall length of the ring-shaped preform 1b can be shortened, and the installation and transport conditions are stabilized. can do.
- a molding die for forming the ring-shaped preform 1a can be easily manufactured.
- Embodiment 11 1.
- FIG. 39 is a plan view (a) and side views (b) and (c) showing a ring-shaped preform according to Embodiment 11 of the present invention, and a side view (d) showing a ring-shaped preform.
- FIG. 40 is a side view showing a ring-shaped molded article of another shape according to Embodiment 11 of the present invention, and the same reference numerals as those in FIG. 19 indicate the same or corresponding parts.
- the shapes of the convex portion 1e and the concave portion 1c in the ninth embodiment extend in the radial direction. It has a trapezoidal shape, in which convex portions 1e and concave portions 1c are formed alternately at 90 ° intervals.
- the upper end surface of the uppermost ring-shaped preform 1a and the lower end surface of the lowermost ring-shaped preform 1a are flattened to form a ring-shaped preform.
- the total length of the body 1b can be shortened, and the installation and transport state can be stabilized.
- Embodiments 8 to 11 the case where the cross section of the concave portion 1c and the convex portion 1e is arc-shaped or trapezoidal is shown.
- the present invention is not limited to this. You may.
- a ring-shaped magnet having good magnetic properties without radial disturbance is formed. It is possible to improve the shape accuracy and prevent deviation during transport.
- the ring magnet of the present invention can also be applied to a method of laminating while forming a magnetic field in a mold.
- another magnetic powder such as N d 2 F e 1 4 B
- N d 2 F e 1 4 B may be a bonded magnet material obtained by mixing the resin in the magnetic powder.
- the present invention is used, for example, for manufacturing a permanent magnet used in a rotary electric motor such as a motor.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Manufacturing Cores, Coils, And Magnets (AREA)
- Powder Metallurgy (AREA)
- Permanent Field Magnets Of Synchronous Machinery (AREA)
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
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TW092129726A TWI250536B (en) | 2003-02-27 | 2003-10-27 | Ring-shaped magnet and manufacturing method thereof |
CN200380109943.8A CN1754299B (zh) | 2003-02-27 | 2003-10-29 | 环形磁铁及其制造方法 |
JP2004568781A JP4490292B2 (ja) | 2003-02-27 | 2003-10-29 | リング型磁石の製造方法 |
US10/546,827 US7551051B2 (en) | 2003-02-27 | 2003-10-29 | Ring magnet and method of manufacturing the magnet |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2003-50181 | 2003-02-27 | ||
JP2003050181 | 2003-02-27 |
Publications (1)
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WO2004077647A1 true WO2004077647A1 (ja) | 2004-09-10 |
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Application Number | Title | Priority Date | Filing Date |
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PCT/JP2003/013817 WO2004077647A1 (ja) | 2003-02-27 | 2003-10-29 | リング型磁石及びその製造方法 |
Country Status (5)
Country | Link |
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US (1) | US7551051B2 (ja) |
JP (1) | JP4490292B2 (ja) |
CN (2) | CN1754299B (ja) |
TW (1) | TWI250536B (ja) |
WO (1) | WO2004077647A1 (ja) |
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JP2006294908A (ja) * | 2005-04-12 | 2006-10-26 | Mitsubishi Electric Corp | リング型焼結磁石 |
JP2008109725A (ja) * | 2006-10-23 | 2008-05-08 | Mitsubishi Electric Corp | リング型焼結磁石及びその製造方法並びに永久磁石型モータ |
WO2009001801A1 (ja) * | 2007-06-28 | 2008-12-31 | Hitachi Metals, Ltd. | R-tm-b系ラジアル異方性リング磁石、その製造方法、及びそれを製造するための金型、並びにブラシレスモータ用ロータ |
US7524453B2 (en) | 2004-09-22 | 2009-04-28 | Mitsubishi Denki Kabushiki Kaisha | Apparatus for manufacturing ring-shaped powder compact and method of manufacturing sintered ring magnet |
US11400460B2 (en) | 2014-10-15 | 2022-08-02 | Alpaqua Engineering, LLC | Solid-core magnet |
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US20080187393A1 (en) * | 2007-02-02 | 2008-08-07 | John Nellessen | Magnetic joint |
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CN101847486B (zh) * | 2010-06-16 | 2012-05-02 | 内蒙古科技大学 | 医用核磁共振成像仪永磁磁系 |
US9601251B2 (en) | 2012-12-07 | 2017-03-21 | Continental Teves Ag & Co. Ohg | Correction of angle errors in permanent magnets |
US9273792B2 (en) * | 2013-04-25 | 2016-03-01 | Kefico Corporation | Solenoid valve with magnet filter |
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JP6410776B2 (ja) * | 2016-10-06 | 2018-10-24 | 本田技研工業株式会社 | ロータ製造方法 |
CN107622856A (zh) * | 2017-09-01 | 2018-01-23 | 中山市高科斯电子科技有限公司 | 一种可拼接成任意长度的磁铁及应用该磁铁的磁芯 |
US11242519B2 (en) | 2018-08-23 | 2022-02-08 | Alpaqua Engineering, LLC | Discontinuous wall hollow core magnet |
EP3840891A1 (en) * | 2018-08-23 | 2021-06-30 | Alpaqua Engineering, LLC | Solid-core magnet |
CN112053843B (zh) * | 2020-08-17 | 2022-04-29 | 包头韵升强磁材料有限公司 | 一种大尺寸烧结钕铁硼坯料的成型模压方法 |
US11610731B2 (en) | 2021-03-09 | 2023-03-21 | Hirofusa Otsubo | Apparatus for assembling a non-directional free electron generating repelling magnet combination |
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JP2008109725A (ja) * | 2006-10-23 | 2008-05-08 | Mitsubishi Electric Corp | リング型焼結磁石及びその製造方法並びに永久磁石型モータ |
WO2009001801A1 (ja) * | 2007-06-28 | 2008-12-31 | Hitachi Metals, Ltd. | R-tm-b系ラジアル異方性リング磁石、その製造方法、及びそれを製造するための金型、並びにブラシレスモータ用ロータ |
JP5267459B2 (ja) * | 2007-06-28 | 2013-08-21 | 日立金属株式会社 | R−tm−b系ラジアル異方性リング磁石、その製造方法、及びそれを製造するための金型、並びにブラシレスモータ用ロータ |
US8937419B2 (en) | 2007-06-28 | 2015-01-20 | Hitachi Metals, Ltd. | Radially anisotropic ring R-TM-B magnet, its production method, die for producing it, and rotor for brushless motor |
US11400460B2 (en) | 2014-10-15 | 2022-08-02 | Alpaqua Engineering, LLC | Solid-core magnet |
Also Published As
Publication number | Publication date |
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US7551051B2 (en) | 2009-06-23 |
CN101819847A (zh) | 2010-09-01 |
JPWO2004077647A1 (ja) | 2006-06-08 |
US20060158292A1 (en) | 2006-07-20 |
TWI250536B (en) | 2006-03-01 |
JP4490292B2 (ja) | 2010-06-23 |
TW200419596A (en) | 2004-10-01 |
CN101819847B (zh) | 2012-07-18 |
CN1754299B (zh) | 2012-05-23 |
CN1754299A (zh) | 2006-03-29 |
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