WO2008065938A1 - Rotor à aimant permanent et moteur l'utilisant - Google Patents
Rotor à aimant permanent et moteur l'utilisant Download PDFInfo
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- WO2008065938A1 WO2008065938A1 PCT/JP2007/072500 JP2007072500W WO2008065938A1 WO 2008065938 A1 WO2008065938 A1 WO 2008065938A1 JP 2007072500 W JP2007072500 W JP 2007072500W WO 2008065938 A1 WO2008065938 A1 WO 2008065938A1
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- Prior art keywords
- magnetic pole
- permanent magnet
- magnetic
- magnet rotor
- motor
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Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/27—Rotor cores with permanent magnets
-
- 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
- H01F1/047—Alloys characterised by their composition
- H01F1/053—Alloys characterised by their composition containing rare earth metals
- H01F1/055—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5
- H01F1/057—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B
- H01F1/0571—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B in the form of particles, e.g. rapid quenched powders or ribbon flakes
- H01F1/0575—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B in the form of particles, e.g. rapid quenched powders or ribbon flakes pressed, sintered or bonded together
- H01F1/0578—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B in the form of particles, e.g. rapid quenched powders or ribbon flakes pressed, sintered or bonded together bonded together
-
- 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
- H01F1/047—Alloys characterised by their composition
- H01F1/053—Alloys characterised by their composition containing rare earth metals
- H01F1/055—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5
- H01F1/059—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and Va elements, e.g. Sm2Fe17N2
-
- 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 anisotropy direction M ⁇ relative to the mechanical angle ⁇ is controlled by the deformation of the magnetic poles, and the anisotropy is continuously controlled to a distribution of 90 X sin [ ⁇ ⁇ 2 ⁇ / (360 / ⁇ ) ⁇ ].
- the anisotropy direction M ⁇ relative to the mechanical angle ⁇ is controlled by the deformation of the magnetic poles, and the anisotropy is continuously controlled to a distribution of 90 X sin [ ⁇ ⁇ 2 ⁇ / (360 / ⁇ ) ⁇ ].
- power saving, resource saving, downsizing, and noise reduction of permanent magnet motors of approximately 50W or less which are widely used as various drive sources for home appliances, air conditioning equipment, and information equipment.
- the present invention relates to a permanent magnet rotor whose anisotropy is continuously controlled and a motor using the same.
- Non-Patent Document 1 describes the relationship between the residual magnetic flux density Br, which is one of the basic characteristics of the magnet, and the motor constant KJ (KJ is the ratio of the output torque KT and the square root of resistance loss ⁇ R) as an index of motor performance. From the relationship, when the motor diameter, rotor diameter, air gap, soft magnetic material, magnet size, etc. are fixed, the increase in the magnet energy density (BH) max is increased in the radial air gap type magnet motor targeted by the present invention. It states that a higher torque density can be obtained.
- KJ is the ratio of the output torque KT and the square root of resistance loss ⁇ R
- BH max of the magnet can achieve a higher torque density in the motor targeted by the present invention, but the stator core of the motor has a slot for storing the winding. Since there are teeth that form part of the magnetic circuit, the permeance changes with rotation. For this reason, increasing the magnet energy density (BH) max increases torque pulsation, ie, cogging torque. Increasing cogging torque hinders smooth rotation of the motor, increases motor vibration and noise, and causes adverse effects such as deterioration of rotation controllability.
- a magnetic pole having a certain thickness in the magnetization direction it is possible to increase the thickness of the magnet.
- remanent magnetization Br l. 2T, maximum thickness of magnetic pole center 3mm, and minimum thickness of magnetic pole ends 1.5mm.
- the motor shown in FIG. 11A has an uneven magnetic pole 1, a stator core 2, a stator core slot 3, and a stator core tooth 4.
- the cogging torque can be reduced even with the magnetic pole 1 that is uneven from the outer diameter side of the magnetic pole 1 and the opposite magnetic pole 1 from the inner diameter side.
- the magnetic pole tip of a thick magnetic pole is thinned to about 1/2 and fixed. Increase the gap with the stator core or reduce the area between the thin magnetic poles. Therefore, the amount of the static magnetic field Ms generated from the magnetic poles flowing into the stator core as the magnetic flux ⁇ is suppressed. As a result, these methods result in a reduction in torque density of generally 10 to 15% due to a reduction in cogging torque. Therefore, the cogging torque reduction method using the conventional technology shown in FIGS. 11A, 11B, and 11C has a contradictory relationship with increasing the torque density of the motor by increasing the magnet energy density (BH) max. It was.
- BH magnet energy density
- each magnetic pole is composed of 2 to 5 pieces and the magnetization direction (direction of magnetic anisotropy) is adjusted stepwise for each piece.
- the subscripts (2) to (5) of the magnetic pole 1 indicate the number of pieces obtained by dividing the magnetic pole 1 into 2 to 5 parts.
- the direction of the arrow in each fragment indicates the direction of the magnetization vector M along the oriented easy axis (C axis), that is, the direction of anisotropy.
- Fig. 13 shows that the magnetization vector M at an arbitrary mechanical angle ⁇ and the angle with respect to the circumferential tangent of the magnetic pole is M ⁇ . This suggests that it is ideal to change continuously.
- the subject of the present invention is, for example, a thin shape such as a thickness of 1.5 mm that is difficult to be unevenly thickened.
- Another object of the present invention is to provide a permanent magnet rotor and a motor using the permanent magnet rotor that realize a novel cogging torque reduction that does not reduce the volume or area of the magnetic pole in an anisotropic magnetic pole having a high energy density.
- the main points of the present invention are that when the magnetic pole is deformed and the anisotropic direction with respect to the radial tangent of the magnetic pole surface is M ⁇ , the mechanical angle is ⁇ , and the number of pole pairs is p, M ⁇ and 90 X sin [ (i)
- This is a permanent magnet rotor whose absolute direction average of ⁇ 2 ⁇ / (360 / ⁇ ) ⁇ ] is continuously controlled to 3 degrees or less.
- the direction of anisotropy ⁇ ⁇ force Permanent magnet rotor distributed sinusoidally in the range of 0 to 90 degrees with respect to mechanical angle ⁇ .
- a permanent magnet rotor whose anisotropy is continuously controlled has not been known so far.
- the permanent magnet rotor according to the present invention has a high energy density! /
- the relationship ⁇ 2 ⁇ / (360 / ⁇ ) ⁇ ] can be given with high accuracy, and the contradictory effects of reducing cogging torque and increasing torque density can be achieved.
- the volume fraction of magnetic material with macro structure separated by matrix (continuous phase) and binder and energy density (BH) max ⁇ 270kj / m 3 in magnetic anisotropic magnetic pole is more than 80vol.%
- the direction of the incoming magnetic field Hm shall be the same direction as the orientation magnetic field Hex, and it shall be 2.4 MA / m or more.
- a magnetically isotropic magnet can be freely magnetized in any direction according to the direction of the applied magnetic field and the magnetic field strength distribution. Therefore, by optimizing the shape of the magnetized yoke and the magnetomotive force, it is possible to give a magnetization pattern as shown by the arc-shaped arrow of magnetic pole 1 in FIG. it can. As a result, the gap magnetic flux density distribution between the magnetic pole and the stator core can be easily adjusted to a sine wave shape. Therefore, the reduction of the cogging torque of the motor is extremely easy compared to the case where the thin magnetic pole is made of a magnetically anisotropic magnet material.
- isotropic magnet materials with different powder shapes are also available industrially (for example, see Non-Patent Documents 7 to 10).
- the present invention is intended for a motor equipped with a permanent magnet rotor.
- V higher! /, While obtaining torque density, increases cogging torque.
- N. Takahashi et al. In the manufacture of arc-shaped anisotropic magnets used in motors, placed a magnetic body in a non-magnetic molding die and changed the direction of the magnetic flux ⁇ of the cavity portion from a uniform direction. Proposed a method to control the direction of anisotropy by changing the direction of (See page 12).
- Non-Patent Document 1 J. Schulze, “Application oi nigh periormance magnets for small motors”, Proc. Of the 18th international workshop on hig h performance magnets and their applications, 2004, pp. 908—91 5
- Non-Patent Document 2 ⁇ Pang, ⁇ . Q. Zhu, S. Ruangsinchaiwanich, D. Howe, “Comparison of brushless motors having renzach magnetized magnets and shaped parallel magnetized magnets”, Proc. Of the 18th inter national workshop on high performance magnets and their applicat ions, 2004, pp. 400— 407
- Non-Patent Document 3 W. Rodewald, W. Rodewald, M. Katter, ⁇ Properties and applications of high performance magnets '', Proc. Of the 18th inter national workshop on high performance magnets and their applicat ions, 2004, pp. 52— 63
- Non-Patent Document 4 Atsushi Matsuoka, Togo Yamazaki, Hitoshi Kawaguchi, “Examination of high performance brushless DC motor for blower”, IEEJ rotating machine workshop, RM-01-161, 2001
- Non-Patent Document 5 D. Howe, ZQ Zhu, "Application oi nalbach cylinders to electrical machine", Proc. Of the 17th int. Workshop on rare earth magnets and their applications, 2000, pp. 903-922 6: RW Lee, EG Brewer, NA Schaffel, “Hot— pressed
- Non-Patent Document 7 Yasuhiko Iriyama, “Development Trend of High Performance Rare Earth Bond Magnets”, Ministry of Education, Culture, Sports, Science and Technology Innovation Creation Project / Effective Utilization of Rare Earth Resources and Advanced Materials Symposium, 2002, pp. 19-26
- Non-Patent Document 8 B. H. Rabin, B. M. Ma, “Recent developments in Nd—Fe— B powderj, 120th Topical Symposium of the Magnetic Society of Japan, 2001, pp. 23— 28
- Non-Patent Document 9 B. M. Ma, "Recent powder development at magnequen ch”, Polymer Bonded Magnets 2002, 2002
- Non-Patent Document 10 S. Hirasawa, H. Kanekiyo, T. Miyoshi, K. Murakami, Y. S higemoto, T. Nishiuchi, “Structure and magnetic properties of Nd 2Fel4B / FexB— type nanocomposite permanent magnets prepared by strip casting , 9th Joint MMM / INTERMAG, FG—05, 2004
- Non-Patent Document 11 HA Davies, JI Betancourt, CL Harland, “Nanophas e Pr and Nd / Pr based rare-earth-iron-boron alloys”, Proc. of 16th Int. Workshop on Rare— Earth Magnets and Their Applicati ons, 2000, pp. 485—495
- Non-Patent Document 12 N. Takahashi, K. Ebihara, K. Yoshida, T. Nakata, K. Ohas hi and K. Miyata, ⁇ IrLvestigation of simulated annealing method a nd its application to optimal design of die mold for orientation of magnetic powderj, IEEE Trans. Mag., Vol. 32, No. 3, 1996, pp. 1 210-1213
- Non-Patent Document 13 A. Kawamoto T. Ishikawa, S. Yasuda, K. Takeya, K. Ishiz aka, T. Iseki, K. Ohmori, “SmFeN magnet powder prepared by red auction and diffusion methodj, IEEE Trans. , 35, 1999, pp. 3 322
- Non-Patent Document I3 ⁇ 4 14 T. Takeshita, R. Nakayama, “Magnetic properties and micro-structure of the Nd—Fe— B magnet powders produced by h ydrogen treatmentj, Proc. 10th Int. Workshop on Rare— earth Magnets and Their Applications, 1989, pp. 551— 562
- Non-Patent Document 15 F. Yamashita ⁇ H. Fukunaga, “Radially— anisotropic rare — earth hybrid magnet with self— organizing binder consolidated un der a heat and a low— pressure configurationj, Proc. 18th Int. W orkshop on High Performance Magnets and Their Applications, An necy, 2004, pp. 76— 83
- the anisotropy direction M ⁇ is continuously controlled to a distribution of 90 X sin [ ⁇ ⁇ 2 ⁇ / (360 / ⁇ ) ⁇ ] by the deformation of the magnetic poles with respect to the mechanical angle ⁇ .
- the cogging torque of the motor is increased regardless of the anisotropic magnetic pole approximately twice that of an isotropic magnet with a sinusoidal magnetization of (BH) max ⁇ 80kj / m 3
- Use force S to increase the torque density.
- FIG. 1A is a first conceptual diagram showing anisotropic direction control by deformation.
- FIG. 1B is a second conceptual diagram showing anisotropic direction control by deformation.
- FIG. 2A is a first conceptual diagram of a deformation pattern indicated by a stress distribution.
- FIG. 2B is a second conceptual diagram of the deformation pattern indicated by the stress distribution.
- FIG. 2C is a third conceptual diagram of the deformation pattern indicated by the stress distribution.
- FIG. 3A is a first conceptual diagram showing a flow form of a molten polymer by an external force.
- FIG. 3B is a second conceptual diagram showing a flow form of the molten polymer by an external force.
- FIG. 4 is a schematic diagram showing the molecular structure of a thermosetting resin composition responsible for viscous deformation.
- FIG. 5 is a perspective external view of a magnetic pole, a permanent magnet rotor, and a permanent magnet type motor.
- FIG. 6 is an electron micrograph showing the macro structure of a magnetic pole.
- FIG. 7 is a characteristic diagram showing the magnetic performance of the magnetic poles.
- FIG. 8 is a characteristic diagram showing the relationship of mechanical angle ⁇ static magnetic field Ms direction.
- FIG. 9 is a characteristic diagram showing the relationship between the mechanical angle ⁇ and the anisotropy direction M ⁇ .
- Fig. 10 is a characteristic diagram showing the relationship between the circumferential length Lo / L and the accuracy of continuous direction control of anisotropy.
- Fig. 11A is a first conceptual diagram showing a conventional cogging torque reduction method using a magnet shape.
- FIG. 11B is a second conceptual diagram showing a conventional cogging torque reduction method using a magnet shape.
- Fig. 11C is a third conceptual diagram showing a conventional cogging torque reduction method using a magnet shape.
- FIG. 12A is a first conceptual diagram showing a conventional cogging torque reduction method by discontinuous control of the magnetization direction.
- FIG. 12B is a second conceptual diagram showing a conventional cogging torque reduction method by discontinuous control of the magnetization direction.
- FIG. 12C is a third conceptual diagram showing a conventional cogging torque reduction method by discontinuous control of the magnetization direction.
- FIG. 12D is a fourth conceptual diagram showing a cogging torque reduction method by conventional discontinuous control of the magnetization direction.
- Fig. 13 is a characteristic diagram showing the relationship between the number of magnetic pole pieces with different magnetization directions and the cogging torque.
- FIG. 14 is a conceptual diagram showing the magnetization pattern of a conventional isotropic magnet.
- the energy density (BH) max which is a disadvantage of the isotropic magnet, is increased more than approximately twice, the anisotropy direction with respect to the radial tangent of the magnetic pole surface is M ⁇ , and the mechanical angle is ⁇
- the anisotropy is precisely set so that the absolute direct average of the difference between ⁇ and 90Xsin [(i) ⁇ 2 ⁇ / (360 / ⁇ ) ⁇ ] is 3 degrees or less.
- a permanent magnet rotor with continuous direction control can be provided. As a result, the torque density of the motor can be increased, and the cogging torque of the motor can be reduced to less than the isotropic magnet in the same shape.
- the main point of the present invention is that when the anisotropy direction with respect to the radial tangent of the magnetic pole surface is ⁇ , the mechanical angle is ⁇ , and the number of pole pairs is ⁇ , ⁇ and 90Xsin [ ⁇ ⁇ 2 ⁇ / (360 / This is a permanent magnet rotor whose continuous direction is controlled with an accuracy of 3 degrees or less. That is, ⁇ ⁇ is a permanent magnet rotor distributed in a range of 0 to 90 degrees in a sinusoidal shape with respect to ⁇ . Thus, a permanent magnet rotor whose anisotropy is continuously controlled is not known so far.
- FIG. 1A a magnetic pole in which a portion close to in-plane anisotropy is mechanically applied to the end of the magnetic pole is prepared. Then, it is transformed into an arc-shaped magnetic pole as shown in FIG. 1B.
- FIG. 1B it is possible to prepare a magnetic pole in which the direction of anisotropy with respect to the radial tangent of the magnetic pole face is continuously controlled so that 90Xsin [(i) ⁇ 2 ⁇ / (360 / ⁇ ) ⁇ ].
- Figs. 1A and IB show the cross-sectional shape of the right half from the center of the magnetic pole, and H ⁇ shown in Fig.
- 1A is the angle formed with the uniform orientation magnetic field Hex with respect to the tangent to the surface of any magnetic pole piece. This ⁇ corresponds to the direction of anisotropy M ⁇ with respect to the tangent to the surface of any pole piece in FIG. 1B.
- the present invention continuously controls the anisotropy by deformation.
- the average absolute value of the difference between M ⁇ and 9 0 X sin [ ⁇ ⁇ 2 ⁇ / (360 / ⁇ ) ⁇ ] should be 3 degrees or less.
- H ⁇ is the angle with the uniform orientation magnetic field Hex with respect to the radial tangent of the inner and outer peripheral surfaces
- Lo is the gap side circumference of the magnetic pole before deformation
- L is the gap side circumference of the magnetic pole after deformation.
- the magnetic pole is deformed in the radial direction by external force as shown in Fig. 2A-2B-2C. At that time, at the stage of FIGS.
- FIGS. 2A, 2B, and 2C are conceptual diagrams showing the stress distribution during deformation by the external force F, and the hatching density indicates the degree of stress.
- ⁇ represents the force, shear stress and direction in the present invention.
- thermosetting resin composition prepared so that the magnetic pole can be deformed such as 2A, 2B, and 2C, is an essential component.
- the deformation referred to here means that a part of the binder component is uniformly distributed in the magnetic pole as an intertwined thread-like molecular chain due to heat, and an external force F—
- the principle is viscous deformation due to shear flow or elongational flow according to F ′.
- the deformed magnetic pole preferably has a three-dimensional network structure by, for example, a binder component as shown in FIG. 4 by a crosslinking reaction to ensure the heat resistance and durability of the magnetic pole.
- the example of FIG. 4 is a thermosetting resin composition composed of a novolac type epoxy oligomer, a linear polyamide, and 2-phenylenoyl 4,5-dihydroxymethyl imidazole, which is useful for the present invention and can impart deformability to the magnetic pole. It is an example of the adjusted binder.
- the uncrosslinked linear polyamide when the uncrosslinked linear polyamide is in a molten state due to heat, it is uniformly distributed in the matrix of the magnetic poles as intertwined thread-like molecular chains.
- thermosetting resin composition providing the flow shown in FIGS. 3A and 3B is not limited to FIG.
- the torque density of the permanent magnet motor is proportional to the gap magnetic flux density with the magnetic pole when the static magnetic field Ms generated by the magnetic pole flows as a magnetic flux to the stator core.
- the anisotropic magnet forming the magnetic pole according to the present invention has a residual magnetization Mr ⁇ 0.95T, an intrinsic coercive force HcJ ⁇ O. 9MA / m, and an energy density (BH) max from the viewpoint of increasing the torque density. ⁇ 150kj / m3 magnetic performance is desired! /.
- the rare earth magnet material which is effective in the present invention a single domain particle type 1-5SmCo rare earth magnet fine powder and a two-phase separation type 2-17SmCo rare earth magnet particle can be used in part or in whole.
- a rare earth-iron-based magnet material not containing Co as a main component is preferable.
- A. Kawamoto et al. RD (Reduction and Diffusion)-Sm Fe N rare earth magnet fine powder see Non-Patent Document 13
- HDDR—Nd Fe B rare earth produced by recombination
- both Sm and Nd can be used in a balanced manner.
- polycrystalline aggregated NdFeB-based rare earth magnet grains can be used.
- Nd Fe B rare earth magnets when forming with a macro structure separated by a continuous phase
- the volume fraction of the magnet material with energy density (BH) max ⁇ 270 kj / m 3 in the magnetic pole can be increased to 80 vol.% Or more, so the direction of the incoming magnetic field Hm is the same as the orientation magnetic field Hex. 2.
- BH magnetic pole energy density
- a magnetic pole 51 before deformation shown in FIG. 5 was prepared at 50 MPa in a uniform magnetic field Hex of 1 ⁇ 4 MA / m.
- a uniform magnetic field Hex of 1 ⁇ 4 MA / m.
- the deformation was 135 ° C, 2 MPa, uniform orientation magnetic field Hex, and no holding time.
- FIG. 6 is a scanning electron micrograph showing the macro structure of a magnetic pole having a density of 6.01 Mg / m 3 according to the present invention.
- the macro structure of the magnetic pole is that Nd Fe B rare earth magnet particles are Sm F
- N-based rare earth magnet fine powder and a structure separated by a matrix (continuous phase) consisting of a binder and
- the fraction is 81 vol.%.
- the volume fraction occupied by the magnet material in the isotropic Nd Fe B-based bonded magnet is 0.8-1.
- the binder used for the magnetic pole before deformation in this example is the molecular structure shown in FIG. As shown in the conceptual diagram showing the structure, epoxy equivalent 205-220g / eq, melting point 70-76 ° C novolac epoxy oligomer, melting point 80.
- a thermosetting resin composition comprising C, a molecular weight of 4000 to; 12000 spring-like polyamide, 2-phenylene 4,5-dihydroxymethylimidazole. They are not gelled at the molding stage, and the linear polyamide is remelted by heating and interspersed in the magnetic poles as intertwined thread-like molecular chains.
- the external force shown in Figs. 2A, 2B, and 2C It is deformed like magnetic pole 52.
- thermosetting resin composition containing the linear polyamide was bridged and rigidified as shown in FIG. 4, except that FIG. 4 shows a force S indicating a free epoxy group, these are imidazolones, or Can be reacted with the terminal carboxyl group of the linear polyamide.
- FIG. 7 is a characteristic diagram showing the MH curve of the magnetic poles of this example.
- ⁇ of 80kj / m 3 generally is twice! /, Ru.
- the magnetic pole 52 according to the present embodiment shown in FIG. 5 has an outer radius of 20.45 mm, an inner radius of 18.95 mm, a thickness of 1.5 mm, and a weight of 2 g, and is uniform using a solenoid coil and a pulse magnetizing power source.
- 8 magnetic poles were bonded and fixed to the outer peripheral surface of a laminated electrical steel sheet having an outer diameter of 37.9 mm, and the diameter according to this example shown in FIG. 5 was 40.9 mm, the axial length was 14.5 mm, 8 A pole permanent magnet rotor 53 and an 8-pole / 12-slot permanent magnet motor 54 shown in FIG.
- an arc-shaped magnetic pole having an outer radius of 20.45mm, an inner radius of 18.95mm, and a thickness of 1.5mm is directly formed in the space of uniform orientation magnetic field Hex, and a diameter of 40.9mm, which is manufactured by using this arc-shaped magnetic pole.
- Conventional example 1 is a directional length of 14.5 mm and an 8-pole permanent magnet rotor.
- the 80 kj / m 3 isotropic magnet has a ring shape and a weight of 16 g, and has the same outer diameter 37.
- the magnetic pole according to this example is magnetized in the same direction as the uniform orientation magnetic field Hex with a uniform magnetic field Hm of 2.4 MA / m. Also, when magnetized at 2.4 MA / m and 4 MA / m, the remanent magnetization Mr of the magnetic pole was 0.96 T and the coercive force HcJO.9 MA / m was the same value. For this reason, the magnetic pole can be regarded as almost completely magnetized if at least Hm is 2.4 MA / m or more.
- the magnetically anisotropic magnetic pole as described in the present embodiment is displaced in the direction of the uniform magnetic field Hm and the direction of anisotropic M ⁇ (easy magnetization axis direction). Even if it occurs, it can be assumed that it is magnetized along the anisotropic direction M ⁇ . Therefore, the angle M ⁇ between the static magnetic field Ms and the radial tangent of the magnetic pole in Fig. 8 means the direction of anisotropy.
- FIG. 6 is a characteristic diagram showing the relationship between the mechanical angle ⁇ of the 8-pole permanent magnet rotor and the direction of anisotropy ⁇ along with the relationship of 90Xsin ⁇ 2 ⁇ / (360 / ⁇ ) ⁇ ].
- ⁇ is the number of pole pairs (4 in this embodiment)
- FIG. 9 represents a sine curve of 90 ⁇ 3 ⁇ [ ⁇ ⁇ 2 ⁇ / (90) ⁇ ].
- FIG. 10 is different from Lo / L, where Lo is the stator core air gap side circumference of the magnetic pole before deformation according to this embodiment, and L is the stator core air gap side circumference of the magnetic pole after deformation.
- FIG. 6 is a characteristic diagram showing the relationship between the direction of direction M ⁇ and the absolute value average of the difference between 90X [ ⁇ ⁇ 2 ⁇ / (90) ⁇ ]. From Fig. 10, the absolute average of the difference between ⁇ and 90Xsin ⁇ 2 ⁇ / (90) ⁇ ] strongly depends on the Lo / L value, The value is in the range of 1 ⁇ 06-1.14. Then, when the magnetic pole is deformed in the radial direction by external force as shown in Fig.
- the induced voltage proportional to the torque density of the permanent magnet type motor according to this example and the cogging torque were 24. IV and 3 mNm, respectively.
- the conventional example 1 (159 kj / m 3 ) had 25.IV and 6 mNm
- Example 1 has a torque density reduced by 4% and a cogging torque by 50% compared to Conventional Example 1, and a torque density of 134 for Conventional Example 2 (80 kj / m 3 ). Increased by 19% and Cogging torque decreased by 21%.
- an increase in energy density (BH) max can increase the torque density while suppressing an increase in cogging torque of the motor. Therefore, power saving, resource saving, miniaturization and noise reduction of the motor are expected.
- the anisotropy direction M ⁇ is continuously controlled to a distribution of 90 X sin [ ⁇ ⁇ 2 ⁇ / (360 / ⁇ ) ⁇ ] due to deformation of the magnetic pole.
- the present invention relates to a permanent magnet rotor and a motor using the same. More specifically, the purpose is to reduce power consumption, resource saving, downsizing, and quietness of permanent magnet motors of approximately 50W or less, which are widely used as various drive sources for home appliances, air conditioning equipment, and information equipment.
- Anisotropy with continuous direction control This relates to the controlled permanent magnet rotor and the motor using this, and its industrial applicability is extremely high.
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- Crystallography & Structural Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Permanent Field Magnets Of Synchronous Machinery (AREA)
Description
Claims
Priority Applications (4)
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EP07832230.2A EP1956698B1 (en) | 2006-11-27 | 2007-11-21 | Permanent magnet rotor and motor using the same |
US12/162,435 US7759833B2 (en) | 2006-11-27 | 2007-11-21 | Permanent magnet rotator and motor using the same |
JP2008515768A JP4735716B2 (ja) | 2006-11-27 | 2007-11-21 | 永久磁石回転子およびこれを使用したモータ |
CN200780024939XA CN101485065B (zh) | 2006-11-27 | 2007-11-21 | 永久磁铁转子及使用其的马达 |
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JP2006-318255 | 2006-11-27 | ||
JP2006318255 | 2006-11-27 |
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PCT/JP2007/072500 WO2008065938A1 (fr) | 2006-11-27 | 2007-11-21 | Rotor à aimant permanent et moteur l'utilisant |
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US (1) | US7759833B2 (ja) |
EP (1) | EP1956698B1 (ja) |
JP (1) | JP4735716B2 (ja) |
KR (1) | KR100981218B1 (ja) |
CN (1) | CN101485065B (ja) |
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Cited By (2)
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JP2010142082A (ja) * | 2008-12-15 | 2010-06-24 | Seiko Epson Corp | ブラシレス電気機械 |
JP2010199448A (ja) * | 2009-02-27 | 2010-09-09 | Minebea Co Ltd | 自己修復性希土類−鉄系磁石 |
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CA2893579A1 (en) | 2012-12-13 | 2014-06-19 | Dow Agrosciences Llc | Dna detection methods for site specific nuclease activity |
JP6706487B2 (ja) | 2015-11-19 | 2020-06-10 | 日東電工株式会社 | 希土類永久磁石をもった回転子を備える回転電機 |
WO2018186478A1 (ja) * | 2017-04-07 | 2018-10-11 | 日東電工株式会社 | 希土類焼結磁石、希土類焼結体の製造方法、希土類焼結磁石の製造方法及び希土類焼結磁石を用いたリニアモータ |
CN112865362B (zh) * | 2020-12-28 | 2022-03-18 | 珠海格力电器股份有限公司 | 转子铁芯组件、转子和电机 |
CN115800587B (zh) * | 2023-01-29 | 2023-05-09 | 东南大学 | 基于纳米复合永磁材料的组合磁极永磁同步电机 |
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- 2007-11-21 KR KR1020087016096A patent/KR100981218B1/ko active IP Right Grant
- 2007-11-21 JP JP2008515768A patent/JP4735716B2/ja active Active
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- 2007-11-21 WO PCT/JP2007/072500 patent/WO2008065938A1/ja active Application Filing
- 2007-11-21 CN CN200780024939XA patent/CN101485065B/zh active Active
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JP2010142082A (ja) * | 2008-12-15 | 2010-06-24 | Seiko Epson Corp | ブラシレス電気機械 |
JP2010199448A (ja) * | 2009-02-27 | 2010-09-09 | Minebea Co Ltd | 自己修復性希土類−鉄系磁石 |
Also Published As
Publication number | Publication date |
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JPWO2008065938A1 (ja) | 2010-03-04 |
US7759833B2 (en) | 2010-07-20 |
KR100981218B1 (ko) | 2010-09-10 |
EP1956698B1 (en) | 2018-03-07 |
CN101485065A (zh) | 2009-07-15 |
EP1956698A1 (en) | 2008-08-13 |
EP1956698A4 (en) | 2017-03-15 |
US20090021097A1 (en) | 2009-01-22 |
JP4735716B2 (ja) | 2011-07-27 |
KR20080092350A (ko) | 2008-10-15 |
CN101485065B (zh) | 2011-07-20 |
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