WO2005124800A1 - ラジアル異方性円筒焼結磁石及び永久磁石モータ用円筒多極磁石の製造方法 - Google Patents
ラジアル異方性円筒焼結磁石及び永久磁石モータ用円筒多極磁石の製造方法 Download PDFInfo
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- WO2005124800A1 WO2005124800A1 PCT/JP2005/011246 JP2005011246W WO2005124800A1 WO 2005124800 A1 WO2005124800 A1 WO 2005124800A1 JP 2005011246 W JP2005011246 W JP 2005011246W WO 2005124800 A1 WO2005124800 A1 WO 2005124800A1
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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
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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
- H01F41/0273—Imparting anisotropy
- H01F41/028—Radial anisotropy
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
- H01F1/032—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials
- H01F1/04—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials metals or alloys
- H01F1/06—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials metals or alloys in the form of particles, e.g. powder
- H01F1/08—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials metals or alloys in the form of particles, e.g. powder pressed, sintered, or bound together
- H01F1/086—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials metals or alloys in the form of particles, e.g. powder pressed, sintered, or bound together sintered
Definitions
- the present invention relates to a method for manufacturing a radially anisotropic cylindrical sintered magnet and a method for manufacturing a cylindrical multipole magnet for a permanent magnet motor suitable as a cylindrical magnet rotor for a synchronous permanent magnet motor such as a servomotor or a spindle motor. About the method.
- Anisotropic magnets made by pulverizing crystalline magnetic anisotropic materials such as ferrites and rare earth alloys and press-forming them in a specific magnetic field are used as speakers, motors, measuring instruments, and other electromagnets. Widely used for air appliances. Among them, magnets having anisotropy in the radial direction are particularly excellent in magnetic properties, can be freely magnetized, and do not require reinforcement for fixing magnets such as segment magnets. Used for brushless motors, etc. In particular, in recent years, with the improvement of motor performance, long radial anisotropic magnets have been required.
- a magnet having a radial orientation is manufactured by a vertical magnetic field vertical molding method or a backward extrusion method.
- the vertical magnetic field vertical forming method is characterized in that a magnetic field is applied from an opposing direction through a core from a pressing direction to obtain a radial orientation. That is, in the vertical magnetic field vertical molding method, as shown in FIG. 2, the magnetic field generated in the orientation magnetic field coil 2 is opposed through the cores 4 and 5, the cores 4 and 5 pass through the die 3, and the molding machine In a magnetic circuit that circulates through the gantry 1, the charged magnet powder 8 is radially oriented.
- 6 is an upper punch and 7 is a lower punch.
- the magnetic field generated by the coil forms a core, a die, a molding machine base, and a magnetic path serving as the core.
- a ferromagnetic material is used as a material of a portion forming a magnetic path, and mainly an iron-based metal is used.
- the magnetic field strength for orienting the magnet powder is determined as follows5. [0005] The magnetic flux passing through the upper and lower cores collides against the center of the core and opposes to the die. The amount of magnetic flux passing through the core is determined by the saturation magnetic flux density of the core. Degree.
- the orientation magnetic field at the inner and outer diameters of the magnet powder filling is obtained by dividing the amount of magnetic flux passing through the upper and lower cores by the inner and outer areas of the magnet powder filling section.
- Is A (magnet powder filling outer diameter) and magnet powder filling height is L,
- the height of the compact is about half of the height of the filling powder and becomes about 80% during sintering, so the height of the magnet becomes very small.
- the saturation magnetic flux density of the core determines the strength of the orientation magnetic field, the size of the magnet that can be oriented, that is, the height, is determined by the core shape, and it is difficult to manufacture a long product in the cylinder axis direction. Met. In particular, only a very short product could be manufactured with a cylindrical magnet having a small diameter.
- the radial anisotropic magnet is difficult to manufacture by the above method, and it is more difficult to manufacture it in large quantities at low cost.
- a motor using the radial anisotropic magnet is also very expensive. There was a disadvantage of getting it.
- Co substituted for Fe is not only contained in the main phase 2_14_1 of the alloy structure, but forms RCo in the R-rich phase. And significantly reduce the mechanical strength. Power
- R_ (Fe, Co) _B-based radial anisotropic ring magnets are more restrictive in shape than R_Fe_B-based magnets that do not contain Co, and stable magnet production is possible only with a shape with an inner / outer diameter ratio of 0.9 or more. Did not. This is a particularly serious problem for small-diameter radial magnets, because the ratio of inner and outer diameters is reduced even if the wall thickness is small. Also, ferrite magnets and Sm_Co-based magnets have cracks and cracks for the same reason, and are in a state where stable production has not been achieved. 1
- the term that has the greatest effect on the cause of cracks or cracks is ⁇ : difference in linear expansion coefficient (H II-a ⁇ ), and is a ferrite magnet, an Sm—Co-based rare earth magnet.
- H II-a ⁇ difference in linear expansion coefficient
- Sm—Co-based rare earth magnet difference in linear expansion coefficient depending on the crystal direction
- thermal expansion anisotropy appears from the Curie temperature and increases as the temperature decreases during cooling. At this time, the residual stress exceeds the mechanical strength of the magnet, leading to cracking.
- the stress due to the difference in thermal expansion between the orientation direction and the direction perpendicular to the orientation direction occurs because the cylindrical magnet is radially oriented over the entire circumference in the radial direction. Therefore, if a cylindrical magnet having a partly different orientation from the radial orientation is manufactured, no cracking will occur.
- a magnetic field perpendicular to the cylinder axis produced by a horizontal magnetic field vertical molding method Oriented cylindrical magnets do not crack in any type of Sm_Co-based rare-earth magnet or Nd_Fe (Co) _B-based rare-earth magnet.
- the present invention has been made in view of the above circumstances, and it is possible to easily manufacture a multi-unit, long product. Even if the internal / external diameter ratio is small, the present invention may cause cracks during sintering or aging cooling.
- the present invention uses a ferromagnetic material having a saturation magnetic flux density of 0.5 T or more for at least a part of a core of a molding die for a cylindrical magnet, and fills the mold cavity with the ferromagnetic material.
- a method for producing a radially anisotropic cylindrical sintered magnet by applying an orientation magnetic field to a magnet powder by a horizontal magnetic field vertical molding method and shaping the obtained magnet powder, and sintering the obtained compact. And the following (i) to (iii)
- a method for producing a radially anisotropic cylindrical sintered magnet characterized by obtaining a radially anisotropic cylindrical sintered magnet of 50 to 95%.
- the local orientation is intentionally disturbed by increasing or decreasing the residual magnetic flux density in the radial direction of the cylinder of the radially anisotropic cylindrical sintered magnet along the circumferential direction of the cylinder.
- This makes it possible to manufacture radially anisotropic cylindrical sintered magnets having good magnetic properties without cracking or cracking during sintering or aging cooling, especially radial anisotropic rare earth cylindrical sintered magnets.
- a radially anisotropic cylindrical sintered magnet having excellent magnetic properties free from cracks and cracks even in a shape having a small inner / outer diameter ratio, and particularly a radially anisotropic rare earth cylindrical sintered magnet can be manufactured.
- the present invention provides the radially anisotropic cylindrical sintered magnet obtained by the above method within a range of ⁇ 10 ° in a circumferential direction centered on a radial direction where the residual magnetic flux density shows a minimum value.
- a method for manufacturing a cylindrical multipole magnet for a permanent magnet motor wherein the magnet is magnetized to 4n poles (n is an integer of 1 to 20) so that a boundary between the N pole and the S pole is located.
- the circumferential direction of the cylindrical magnet is within a range of ⁇ 10 ° in the circumferential direction centered on the radial direction where the residual magnetic flux density shows the minimum value, including the part where the residual magnetic flux density shows the minimum value with the orientation disorder.
- An anisotropic cylindrical sintered magnet can be manufactured.
- a servo motor, a spindle motor, and the like are provided. It is possible to manufacture cylindrical multi-pole magnets for permanent magnet motors having excellent magnetic properties, suitable for use as cylindrical magnet rotors for synchronous permanent magnet motors. It becomes.
- FIG. 1 is an explanatory view showing one embodiment of a horizontal magnetic field vertical forming apparatus used when manufacturing the radially anisotropic cylindrical sintered magnet of the present invention, wherein (a) is a plan view, b) is a longitudinal sectional view.
- FIG. 2 is an explanatory view showing a conventional vertical magnetic field vertical forming apparatus used when manufacturing a radially anisotropic cylindrical sintered magnet, where (a) is a longitudinal sectional view and (b) is a view in (a) of FIG.
- FIG. 4 is a sectional view taken along line A-A ′.
- FIG. 3 is an explanatory view schematically showing magnetic field lines when a magnetic field is generated when a radially anisotropic cylindrical sintered magnet is manufactured by the apparatus shown in FIGS. 1 and 2.
- the method for producing a radially anisotropic cylindrical sintered magnet of the present invention uses a ferromagnetic material having a saturation magnetic flux density of 0.5 T or more for at least a part of the material of the core of the molding die for a cylindrical magnet.
- the magnet powder filled in the mold cavity is molded by applying an orientation magnetic field to the magnet powder by a horizontal magnetic field vertical molding method, and the obtained molded body is sintered to form a radially anisotropic cylindrical sintered magnet. It is a method of manufacturing, the following (i) ⁇ (iii)
- the residual magnetic flux density in the radial direction of the cylinder increases and decreases in a 90 ° cycle along the circumference of the cylinder, and the maximum value of the residual magnetic flux density in the radial direction over the entire circumference of the cylinder becomes 0.95 or more: 1.
- a radially anisotropic cylindrical sintered magnet having 60 T and a minimum value of the residual magnetic flux density in the radial direction of 50 to 95% of the maximum value is obtained.
- a ferromagnetic material having a saturation magnetic flux density of 0.5 T or more is used for at least a part of a core of a molding die for a cylindrical magnet,
- the magnet powder filled in the mold cavity is molded by applying a directional magnetic field to the magnet powder by a horizontal magnetic field vertical molding method, and the obtained compact is sintered.
- Fig. 1 is an explanatory view of a horizontal magnetic field vertical forming apparatus for performing orientation in a magnetic field when forming a cylindrical magnet.
- This horizontal magnetic field vertical forming apparatus is particularly suitable for manufacturing motor magnets. It is.
- 1 indicates a molding machine stand
- 2 indicates an orientation magnetic field coil
- 3 indicates a die
- 5a indicates a core.
- Reference numeral 6 denotes an upper punch
- 7 denotes a lower punch
- 8 denotes a charged magnetic powder
- 9 denotes a pole piece.
- the core of the molding die for a cylindrical magnet such as the core indicated by 5a in Fig. 1
- the strong core material include ferromagnetic materials using materials such as Fe-based materials, Co-based materials, and alloys thereof.
- FIG. 3 (b) when the entire core 5b is used as a non-magnetic material or a material having a saturation magnetic flux density equivalent to that of the magnet powder, the magnetic flux lines are as shown in FIG. 3 (b). Parallel to each other, near the center (horizontal center of the applied magnetic field) in the figure is in the radial direction, but as it goes upward and downward (on both sides in the horizontal direction of the applied magnetic field), it becomes the direction of the orientation magnetic field by the coil.
- the magnetic flux tends to enter the ferromagnetic material perpendicularly when an orientation magnetic field is applied to the magnet powder. Draw near magnetic field lines. Therefore, as shown in FIG. 3A, the magnetic field direction of the magnet powder filling portion can be made closer to the radial orientation.
- the core is formed of a ferromagnetic material, if the core has a saturation magnetic flux density of less than 0.5T, the core is easily saturated, and although the ferromagnetic core is used. When the magnetic field is close to the state shown in Fig. 3 (b), radial orientation cannot be performed effectively.In addition, when the magnetic field is less than 0.5T, the saturation density of the filled magnet powder (the saturation magnetic flux density of the magnet) X filling factor), and the direction of the magnetic flux in the filled magnet powder and the ferromagnetic core is not equal to the magnetic field direction of the coil. I will.
- the entire core is a ferromagnetic material.
- the magnetic field is applied by performing at least one of the above operations.
- the initial magnetic field application is in a state as shown in Fig. 3 (a), and the filled magnet powder is placed at the center of the cylindrical magnetic field application direction and on both sides of the magnetic field application direction. At the part overlapping with the part, it is oriented in the direction of application of the magnetic field, and at other parts, it is oriented close to radial.
- the filled magnet powder is displaced horizontally (in the direction of the end face of the cylinder) with respect to the previously applied magnetic field.
- the magnetic field is applied in the radial direction except for the portion overlapping the central portion of the cylinder in the magnetic field application direction and both sides in the magnetic field application direction, so that the degree of orientation in the radial direction is increased.
- the magnetic field is applied perpendicularly to the orientation direction by the previous magnetic field application at the part that overlaps the center of the cylinder in the magnetic field application direction and both sides in the magnetic field application direction. The force that will be applied All magnet particles in this area will not be oriented in the direction of the newly applied magnetic field. Therefore, each magnet particle constituting the magnet is oriented in a different direction.
- the number of repetitions is preferably 3 to 10 times. More preferably, it is 3 to 7 times.
- the residual magnetic flux density in the radial direction of the cylinder increases and decreases in a cycle of 90 ° along the circumferential direction of the cylinder, and the diameter in the entire circumference of the cylinder increases.
- the stress represented by the above-described formula (1) is generated due to a radially oriented continuum in the circumferential direction, that is, a radially anisotropic cylindrical magnet, and the radial orientation is degraded in the radial direction. Stress can be reduced by partially relaxing the stress.
- the radially anisotropic cylindrical sintered magnet obtained by the method for manufacturing a sintered cylindrical anisotropic magnet of the present invention the residual magnetic flux density in the radial direction of the cylinder increases and decreases at a 90 ° cycle along the circumferential direction of the cylinder. It is becoming so.
- the residual magnetic flux density in the radial direction along the circumferential direction of the cylinder increases and decreases in four cycles during the entire circumference (360 °), and the maximum and minimum values of the residual magnetic flux density in the radial direction are each 90 ° apart. There are four places each. Then, a portion where the orientation is disturbed (a portion where the orientation is discontinuous) is a portion where the residual magnetic flux density in the radial direction shows a minimum value.
- a portion having a disordered orientation exists randomly, after magnetizing, a portion having a low magnetic flux density will be present separately, which may cause torque clipping when incorporated in a motor.
- the radially anisotropic cylindrical sintered magnet of the present invention there are portions where the orientation is disturbed at every 90 ° along the circumferential direction of the cylinder, that is, there are portions where the residual magnetic flux density is low. Since the portions having a small amount of magnetic flux are periodically arranged at intervals of 90 °, the torque ripple is reduced.
- the portion whose orientation is disturbed exists continuously from the upper end to the lower end of the cylinder in the cylinder axis direction, and the occurrence of cracks and cracks is suppressed over the entire axial direction of the cylinder magnet.
- the part where the orientation is disturbed since the part is oriented in a direction different from the radial direction, the residual magnetic flux density is not small, and each of the magnet particles constituting the part is in a different direction. The stress that causes cracking is efficiently reduced.
- the portion where the orientation is disturbed can be present in a very small volume, and even if it is very small, it is arranged in four places, so that the effect of preventing cracking is great.
- the radially anisotropic cylindrical sintered magnet preferably has a minimum value of the residual magnetic flux density in the radial direction of 50 to 95% of a maximum value. Or 50-90%.
- the minimum value of the residual magnetic flux density in the radial direction is set to 95% or less of the maximum value of the residual magnetic flux density in the radial direction. Is suppressed.
- the minimum value of the residual magnetic flux density in the radial direction is less than 50% of the maximum value, it means that the magnet particles are aligned in a direction other than the radial direction, and the magnetic flux in this area is Changes discontinuously, causing torque ripple. Furthermore, the maximum value of the residual magnetic flux density in the radial direction over the entire circumference of the cylinder is 0.95-1.60T in order to obtain an effective torque when incorporated into the motor.
- the radially anisotropic cylindrical sintered magnet has an outer diameter and an inner diameter of 90 mm or less, an outer diameter of 100 mm or less, and an inner and outer diameter of 90 mm or less. It is preferable that the ratio (inner diameter / outer diameter) is 0.3 or more and the height is 70 mm or less. If the outer diameter is more than 100 mm and the inner diameter is more than 90 mm, a portion with disordered orientation may not be easily formed, and even if formed, the effect of suppressing cracks and cracks may be small.
- a magnet having a required axial length can be obtained by one powder supply and one pressurization, but a magnet may be obtained by a plurality of pressurizations.
- the magnetic field generated by the horizontal magnetic field / vertical molding device is preferably 0.5 to 12 kOe.
- the reason for determining the magnetic field generated by the horizontal magnetic field vertical molding device in this way is that when the magnetic field is large, the core 5a in Fig. 3 (a) becomes saturated, and it becomes a state close to Fig. 3 (b).
- the magnetic field is preferably 12 k ⁇ e or less, particularly preferably 10 k ⁇ e or less, since radial orientation may not be obtained.
- magnetic flux concentrates on the core, so that a magnetic field larger than the magnetic field generated by the coil is obtained around the core.
- the magnetic field is preferably 0.5 k ⁇ e or more, particularly preferably lk ⁇ e or more.
- the magnetic field generated by the horizontal magnetic field vertical shaping device here is the magnetic field or ferromagnetic core at a location sufficiently far from the ferromagnetic material. Means the value of the magnetic field when measured.
- the magnetic field applied to the magnet powder during one of the operations (i) to (iii) immediately before molding or during molding is 1.25 2510 5 / ⁇ 2 ⁇ 10 6 / ⁇ / ⁇ (0.5 to 8 kOe), preferably 2.5 X 10 5 / ⁇ to 1.25 X 10 6 / A / m (l to 5 k ⁇ e).
- the magnetic field is applied in a direction perpendicular to the direction of the applied magnetic field in the direction of the end face of the cylinder.
- This magnetic field is 2 ⁇ 10 6 / ⁇ A / m If it is larger than (8 kOe), it is difficult to maintain the orientation by the immediately preceding application of the magnetic field, and good orientation has already been obtained. On the other hand, 1. 25 chi is less than 10 5 / ⁇ ⁇ / ⁇ ( 0. 5kOe), orientation improvement effect small tool orientation by the magnetic field applied to the magnetic field is too weak is modified May not be improved.
- the magnet powder is not particularly limited. Nd_Fe_B-based force, ferrite magnet, Sm-Co-based rare-earth magnet, and force to use the raw material magnet powder of various bond magnets. Alloy powder having a diameter of 0.1 to 10 zm, particularly l to 8 xm is preferred.
- the method for producing a cylindrical multipole magnet for a permanent magnet motor according to the present invention is characterized in that the radially anisotropic cylindrical sintered magnet obtained by the above-described method is formed such that the radially anisotropic cylindrical sintered magnet has a minimum value at the center. It is magnetized to 4n poles (n is an integer from! To 20) such that the boundary between the N pole and the S pole is located within ⁇ 10 ° of the direction.
- the residual magnetic flux density including the four locations where the orientation is disturbed shows a minimum value
- the N pole and the S pole By magnetizing so that the boundary is located, a portion with little magnetic flux does not appear on the pole, and the magnetic flux density of the pole becomes large and uniform, so the cylindrical multi-pole for permanent magnet motor without motor torque unevenness and torque deterioration You can get a magnet.
- a permanent magnet motor when the cylindrical multipole magnet for a permanent magnet motor is incorporated as a rotor into a motor, particularly a motor having a plurality of stator teeth, a permanent magnet motor can be obtained.
- the radially anisotropic cylindrical sintered magnet obtained by the method for producing a radially anisotropic cylindrical sintered magnet of the present invention, which is subjected to multipolar magnetization in this manner, is a conventional radial anisotropic cylindrical cylinder.
- the magnetization and magnetic properties near the poles are low, so the change in the magnetic flux density between the poles is smooth, and the cogging torque of the motor is sufficiently small.
- the cogging torque can be further reduced.
- the skew angle of the radially anisotropic cylindrical sintered magnet is less than 1/10 of the angle of one pole in the circumferential direction of the radially anisotropic cylindrical sintered magnet, the cogging torque due to the skew magnetization will occur. If the effect of reduction is smaller than 2/3, the tonolek of the motor will increase significantly, so the skew angle is 1/10 to 2/3 of the angle of one pole in the circumferential direction of the radially anisotropic cylindrical sintered magnet. In particular, an angle of 1Z10 to 2Z5 is preferable.
- Nd, Dy, Fe, Co, Al, and Cu each having a purity of 99.7% by mass and B having a purity of 99.5% by mass were melt-formed in a vacuum melting furnace to obtain an alloy of Nd Dy Fe Co B Al Cu Inn
- the ingot was roughly pulverized with a joyou crusher and a brown mill, and further pulverized with a jet mill in a nitrogen stream to obtain a fine powder (magnet powder) having an average particle size of 3.5 ⁇ m.
- a horizontal magnetic field vertical forming apparatus shown in Fig. 1 in which a ferromagnetic material (S45C: Fe steel) core having a saturation magnetic flux density of 2.0 T is arranged on this fine powder.
- a ferromagnetic material S45C: Fe steel
- a magnetic field of 8 kOe is applied from one horizontal direction to orient the filled magnet powder, and a magnetic field of 3 kOe is applied on the spot (without rotation) from the opposite direction to the horizontal direction [1st. Magnetic field application operation],
- the filled magnet powder is further rotated by 90 ° in the horizontal direction, and a magnetic field of 3 k ⁇ e from one horizontal direction and 3 k ⁇ e from the opposite direction is the same as the first magnetic field application operation. Repeat the application operation six times.
- the filled magnetic powder is further rotated 90 ° in the horizontal direction, and while applying a magnetic field of 2.5 k ⁇ e from the same horizontal direction as the first magnetic field application operation, 500 kgf / Molding was performed at a molding pressure of cm 2 . At this time, the packing density of the magnet powder before molding was 40%.
- this compact was sintered in Ar gas at 1,080 ° C for 1 hour, and after sintering, an aging heat treatment was performed at 530 ° C for 1 hour, and a ci) of 30 mm X ⁇ 20 mm X L30 mm A rare earth cylindrical sintered magnet was obtained.
- Table 1 also shows the number of cracks generated when 100 rare earth cylindrical sintered magnets were manufactured by the above method.
- Example 1 Using the same magnetic powder as in Example 1, using a vertical magnetic field vertical forming apparatus shown in Fig. 2, the magnetic field generated by the coil was set at 20k ⁇ e, and the magnetic powder was filled at a height of 30mm. The magnet powder is moved downward and the magnetic powder is further placed on the compact at a filling height of 30 mm, and similarly molded in a magnetic field. The process of filling and molding this magnet powder by 30 mm was repeated once more (total 3 times), sintering and aging heat treatment were performed under the same conditions as in Example 1, and a ⁇ 30 ⁇ 20 mm x L30 mm rare earth cylinder A sintered magnet was obtained. The residual magnetic flux density Br was measured in the same manner as in Example 1, and the number of cracks generated was counted. Table 1 shows the results.
- Nd, Dy, Fe, Co, Al, and Cu each having a purity of 99.7% by mass and B having a purity of 99.5% by mass were melt-formed in a vacuum melting furnace to obtain an alloy of Nd Dy Fe Co B Al Cu Ingo
- the ingot was roughly pulverized with a joyou crusher and a brown mill, and further pulverized with a jet mill in a nitrogen stream to obtain a fine powder (magnet powder) having an average particle size of 3.5 ⁇ m.
- This magnet powder was subjected to a horizontal magnetic field vertical molding device shown in Fig. 1 in which a ferromagnetic material (permendur: Fe-Co alloy) having a saturation magnetic flux density of 2 ⁇ 25T was arranged.
- a ferromagnetic material permendur: Fe-Co alloy
- a magnetic field of 9 kOe is applied from one horizontal direction to orient the filled magnet powder, and a magnetic field of 5 kOe is applied on the spot (without rotation) from the opposite direction to the horizontal direction [1st. Magnetic field application operation],
- the filled magnet powder is further rotated 90 ° in the horizontal direction,
- the molding was performed at a molding pressure of 500 kgf / cm 2 while applying a magnetic field of 2 k ⁇ e from the same horizontal direction as in the first magnetic field application operation and further applying a magnetic field of 2 k ⁇ e from the opposite direction.
- the packing density of the magnet powder before molding was 40%.
- this compact was sintered in Ar gas at 1,100 ° C. for 1 hour, and after sintering, an aging heat treatment was performed at 550 ° C. for 1 hour to obtain ⁇ 8.2 mm ⁇ ⁇ 3.5 mm X L18mm rare earth cylindrical sintered magnet was obtained.
- the maximum value of the residual magnetic flux density in the radial direction of the obtained rare-earth cylindrical sintered magnet over the entire circumference of the cylinder is 1.18 T.
- This magnet is processed into a ⁇ 8mm X ⁇ 3.7mm X LI 7mm, and a positive / negative two direction in each of the magnetic field application direction and the vertical direction during molding (four directions in which the residual magnetic flux density shows the minimum value) ) was magnetized to 4 poles so that the boundary between N pole and S pole.
- a motor was fabricated by incorporating this cylindrical multipole magnet as a rotor into a 6-state toothed motor, and the induced voltage (effective value) and the cogging torque (peak-peak) during 5 i "pm rotation were measured. Shown in
- the motor is manufactured and induced in the same manner as in Example 2 except that the four poles are magnetized so that the residual magnetic flux density is the boundary between the N pole and the S pole. Voltage (effective value) and cogging torque (peak-peak) at 5 rpm rotation were measured. Table 2 shows the results.
- the residual magnetic flux density (Br) of the radially anisotropic cylindrical sintered magnet of Example 2 is very high and is suitable for a high-performance motor.
- the motor of Example 2 has an induced voltage about 1.2 times higher than the motor of Reference Example 1, and the boundary between the N pole and the S pole is located at a portion where the orientation is disordered (that is, the residual magnetic flux density is minimal). Value in four directions), a large induced voltage can be obtained, and a motor using such a radially anisotropic cylindrical sintered magnet becomes a high-performance motor.
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Permanent Field Magnets Of Synchronous Machinery (AREA)
- Manufacturing Cores, Coils, And Magnets (AREA)
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Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
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US10/589,470 US20070151629A1 (en) | 2004-06-22 | 2005-06-20 | Methods of producing radial anisotropic cylinder sintered magnet and permanent magnet motor-use cyclinder multi-pole magnet |
JP2006514816A JPWO2005124800A1 (ja) | 2004-06-22 | 2005-06-20 | ラジアル異方性円筒焼結磁石及び永久磁石モータ用円筒多極磁石の製造方法 |
EP05751141A EP1717828A4 (en) | 2004-06-22 | 2005-06-20 | METHOD FOR THE PRODUCTION OF A RADIAL ANISOTROPIC CYLINDRICAL SINTERED MAGNET AND CYLINDER MULTIPOLMAGNET FOR USE IN A PERMANENT MAGNETIC MOTOR |
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JP2004183221 | 2004-06-22 | ||
JP2004-183221 | 2004-06-22 |
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WO2005124800A1 true WO2005124800A1 (ja) | 2005-12-29 |
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US (1) | US20070151629A1 (ja) |
EP (1) | EP1717828A4 (ja) |
JP (1) | JPWO2005124800A1 (ja) |
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Cited By (3)
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---|---|---|---|---|
JP2009239287A (ja) * | 2008-03-27 | 2009-10-15 | Shenzhen Radimag Technology Co Ltd | ラジアル方向に配向された環状磁石を製造する方法及び装置 |
JP2009283755A (ja) * | 2008-05-23 | 2009-12-03 | Niigata Univ | 永久磁石の着磁方法 |
JP2016158354A (ja) * | 2015-02-24 | 2016-09-01 | 日立金属株式会社 | 極異方性リング磁石、及びそれを用いた回転子 |
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TWI298892B (en) * | 2002-08-29 | 2008-07-11 | Shinetsu Chemical Co | Radial anisotropic ring magnet and method of manufacturing the ring magnet |
JP4438967B2 (ja) * | 2005-12-13 | 2010-03-24 | 信越化学工業株式会社 | ラジアル異方性磁石の製造方法 |
CN101162646B (zh) * | 2007-05-28 | 2011-09-21 | 成问好 | 一种沿半径或直径方向辐射取向的圆环状磁体的成型方法和设备 |
CN101118807B (zh) * | 2007-06-22 | 2010-05-19 | 董中天 | 各向异性粘接或烧结多极环状磁体的磁场取向装置 |
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US10084410B2 (en) * | 2016-12-15 | 2018-09-25 | Bose Corporation | Moving magnet motor and transducer with moving magnet motor |
CN108568520A (zh) * | 2017-09-07 | 2018-09-25 | 江西理工大学 | 一种各向异性钕铁硼磁体的取向成型模具 |
CN110149034B (zh) * | 2019-05-07 | 2020-11-20 | 宁波科星材料科技有限公司 | 一种永磁转子组件的制备方法 |
CN110165847B (zh) | 2019-06-11 | 2021-01-26 | 深圳市瑞达美磁业有限公司 | 不同宽度波形的径向各向异性多极实心磁体的生产方法 |
Citations (2)
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JP2004111944A (ja) * | 2002-08-29 | 2004-04-08 | Shin Etsu Chem Co Ltd | ラジアル異方性リング磁石及びその製造方法 |
JP2004153867A (ja) * | 2001-10-31 | 2004-05-27 | Shin Etsu Chem Co Ltd | ラジアル異方性焼結磁石及びその製造方法並びに磁石ロータ及びモータ |
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KR20030035852A (ko) * | 2001-10-31 | 2003-05-09 | 신에쓰 가가꾸 고교 가부시끼가이샤 | 방사상 이방성 소결 자석 및 그의 제조 방법, 및 자석회전자 및 모터 |
TWI298892B (en) * | 2002-08-29 | 2008-07-11 | Shinetsu Chemical Co | Radial anisotropic ring magnet and method of manufacturing the ring magnet |
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2005
- 2005-06-20 US US10/589,470 patent/US20070151629A1/en not_active Abandoned
- 2005-06-20 JP JP2006514816A patent/JPWO2005124800A1/ja active Pending
- 2005-06-20 CN CNA2005800090327A patent/CN1934663A/zh active Pending
- 2005-06-20 WO PCT/JP2005/011246 patent/WO2005124800A1/ja not_active Application Discontinuation
- 2005-06-20 EP EP05751141A patent/EP1717828A4/en not_active Withdrawn
- 2005-06-21 TW TW094120618A patent/TW200605104A/zh unknown
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JP2004153867A (ja) * | 2001-10-31 | 2004-05-27 | Shin Etsu Chem Co Ltd | ラジアル異方性焼結磁石及びその製造方法並びに磁石ロータ及びモータ |
JP2004111944A (ja) * | 2002-08-29 | 2004-04-08 | Shin Etsu Chem Co Ltd | ラジアル異方性リング磁石及びその製造方法 |
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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2009239287A (ja) * | 2008-03-27 | 2009-10-15 | Shenzhen Radimag Technology Co Ltd | ラジアル方向に配向された環状磁石を製造する方法及び装置 |
JP2009283755A (ja) * | 2008-05-23 | 2009-12-03 | Niigata Univ | 永久磁石の着磁方法 |
JP2016158354A (ja) * | 2015-02-24 | 2016-09-01 | 日立金属株式会社 | 極異方性リング磁石、及びそれを用いた回転子 |
Also Published As
Publication number | Publication date |
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EP1717828A4 (en) | 2007-10-17 |
JPWO2005124800A1 (ja) | 2008-04-17 |
CN1934663A (zh) | 2007-03-21 |
US20070151629A1 (en) | 2007-07-05 |
EP1717828A1 (en) | 2006-11-02 |
TW200605104A (en) | 2006-02-01 |
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