WO2005107038A1 - 圧粉磁心およびその製造方法 - Google Patents
圧粉磁心およびその製造方法 Download PDFInfo
- Publication number
- WO2005107038A1 WO2005107038A1 PCT/JP2005/007779 JP2005007779W WO2005107038A1 WO 2005107038 A1 WO2005107038 A1 WO 2005107038A1 JP 2005007779 W JP2005007779 W JP 2005007779W WO 2005107038 A1 WO2005107038 A1 WO 2005107038A1
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- WO
- WIPO (PCT)
- Prior art keywords
- dust core
- yoke
- teeth
- stator core
- core
- Prior art date
Links
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
- H02K1/12—Stationary parts of the magnetic circuit
- H02K1/14—Stator cores with salient poles
- H02K1/146—Stator cores with salient poles consisting of a generally annular yoke with salient poles
- H02K1/148—Sectional cores
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/02—Details of the magnetic circuit characterised by the magnetic material
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49002—Electrical device making
- Y10T29/49009—Dynamoelectric machine
Definitions
- the present invention generally relates to a dust core and a method of manufacturing the same, and more particularly, to a dust core used as a stator core of an electric motor and a method of manufacturing the same.
- a magnetic core used as a stator core of an electric motor or the like is manufactured by stamping out an electromagnetic steel sheet material, thereafter laminating a plurality of electromagnetic steel sheet materials, and winding a coil around the laminated body. Te ru.
- FIG. 18 is a perspective view showing a method for manufacturing the stator core disclosed in Patent Document 1.
- a core piece 105 having a shape vertically divided in the circumferential direction is formed by molding a composite material of a magnetic powder and an insulating member.
- a coil (not shown) is wound around the wire winding portion of the core piece 105.
- the stator core 110 is formed by combining a plurality of core pieces 105 around which the coils are wound in the circumferential direction and joining the joining surfaces 105a of the adjacent core pieces 105 to each other.
- Patent Document 1 Japanese Patent Application Laid-Open No. 2004-40871
- Patent Literature 1 since the vertically divided core pieces 105 are combined in the circumferential direction, the joining portion of the joining surface 105a is always located in the circumferential direction of the annular portion as shown in FIG. It will be. At such a joint portion of the joint surface 105a, a gear when joining the core pieces 105 is inevitably generated. Therefore, when the magnetic lines of force 130 are generated in the stator core 110, the magnetic lines of force 130 pass through the gap formed by the joint surface 105a due to the magnetic circuit configuration, and there is a problem that the magnetic characteristics are deteriorated. Further, in Patent Document 1, as shown in FIG. 18, the height of a wire winding portion for winding a coil and the entire height of stator core 110 are the same.
- Patent Document 1 as shown in FIG. 18, a part of a corner of a wire winding portion for winding a coil is angular. For this reason, when the coil 106 is wound around the wire winding portion of the core piece 105 as shown in FIG. 21, the insulating coating of the coil 106 is damaged at the sharp corner (region S1) of the wire winding portion at the time of winding. There was a problem of doing.
- an object of the present invention is to solve the above-mentioned problems, and to provide a dust core having good magnetic properties and a method of manufacturing the same.
- Another object of the present invention is to prevent the coil from overhanging or to prevent the insulating coating of the coil from being damaged.
- a dust core according to the present invention includes first and second dust core components.
- Each of the first and second powder magnetic core components integrally has a yoke portion extending annularly and a tooth portion projecting in a radial direction of the yoke portion.
- the first and second dust core components are laminated and joined in the thickness direction.
- the soft magnetic powder is subjected to pressure molding, whereby the annular yoke portion and the teeth portion projecting in the radial direction of the yoke portion are formed.
- the first and second dust core components are stacked in the thickness direction and are not divided in the circumferential direction. For this reason, each yoke portion of the first and second powder magnetic core components is joined to the joint of the powder magnetic core components in the circumferential direction. I do not have. Therefore, even when magnetic lines of force are generated in each yoke, the magnetic lines of force do not pass through the gap at the joint. Therefore, good magnetic characteristics can be obtained without deterioration of the magnetic characteristics due to the magnetic flux passing through the gap at the joint.
- the joining portion of the first and second dust core parts has a boundary surface by joining, and the first and second dust cores at the joining surface by the joining are preferably provided.
- the surface roughness Ry of the component is less than 3 ⁇ m.
- the dimension of the teeth portion in the thickness direction is smaller than the dimension of the yoke portion in the thickness direction.
- the corners of the teeth have a round shape.
- the dust core parts are fixed to each other with a resin interposed at a boundary surface of the dust core parts.
- This resin may be an adhesive of a room temperature natural drying type, an adhesive that develops adhesive strength by heat treatment, or may be heated so that the resin is softened to form a double-sided powder core component.
- the adhesive force may be expressed by the anchor effect of the resin by flowing into the pores between the particles.
- the first and second dust core parts are fixed by at least one of irregularities and bolts, and the irregularities or the insertion portions of the bolts are formed in the yoke portion.
- the inner end surface and the outer end surface are located near the end surface opposite to the side where the teeth portion is located.
- the teeth force to the yoke portion and the yoke force to the teeth portion Since the lines of magnetic force are generated so as to extend, the lines of magnetic force exist near the end surface of the yoke on the side where the teeth are located. If irregularities or bolt insertion parts are arranged in the area where the lines of magnetic force exist, the magnetic properties may be degraded. For this reason, the first and second powder magnetic core components are prevented from being deteriorated in magnetic characteristics by arranging the projections and recesses or the insertion portion of the bolt near the end face opposite to the side where the teeth portion is located. Can be fixed.
- the dust core further includes another dust core component sandwiched between the first and second dust core components, and the other dust core component includes the first dust core component.
- the second powder magnetic core component has the same planar shape as that of the second powder magnetic core component, and the cross-sectional shapes of the yoke portion and the teeth portion have a straight shape.
- first and second powder magnetic core components are increased in dimension in the thickness direction, a density distribution may be generated in the thickness direction when they are formed by pressing. Therefore, by sandwiching the other dust core component described above between the first and second dust core components, the density distribution in the thickness direction of the dust core can be minimized while the density distribution in the thickness direction is minimized. Can be easily adjusted.
- the dies used for the pressure molding of the first and second dust core components include a mold portion for processing the teeth portion and a yoke portion.
- the mold part that cuts the teeth is fixed to the die of the mold, and the mold part that processes the yoke is the die part. It is possible to move to.
- the mold part for removing the teeth By fixing the mold part for removing the teeth to the die of the mold in this manner, even when the corners of the teeth are machined into a round shape, the mold for machining the teeth is used.
- the teeth portion can be processed into a desired shape while securing the strength of the portion.
- FIG. 1 shows an electric motor provided with a stator core manufactured in an embodiment of the present invention. It is a top view.
- FIG. 2 is a schematic cross-sectional view taken along line ⁇ — ⁇ of FIG.
- FIG. 3 is a schematic sectional view taken along the line III-III in FIG. 2.
- FIG. 4 is a partially broken perspective view showing a configuration of a stator core component.
- FIG. 5 ⁇ is a schematic cross-sectional view of the teeth section taken along line III-III of FIG. 2.
- FIG. 5 ⁇ is a schematic cross-sectional view of the teeth section taken along line III-III of FIG. 2.
- FIG. 6 is an enlarged schematic view showing a structure of a surface of a stator core in FIG. 1.
- FIG. 7 is a schematic cross-sectional view showing, in an enlarged manner, the vicinity of a joint between two stator core components 5 in a region S in FIG. 2.
- FIG. 8 is an explanatory view showing a first step of the method for manufacturing a dust core in one embodiment of the present invention.
- A is a plan view of a die of a mold
- (b) is a schematic cross-sectional view corresponding to a cross section taken along line VIIIB-VIIIB of (a)
- (c) is a VinC- cross-section of (a).
- FIG. 4 is a schematic cross-sectional view corresponding to a cross section along the VinC line.
- FIG. 9A An explanatory view showing a second step of the method for manufacturing a dust core in one embodiment of the present invention, and is a plan view of a stator core component.
- FIG. 9B is an explanatory view showing a second step of the method for manufacturing a dust core in one embodiment of the present invention, and is a schematic sectional view along the line IXB-IXB in FIG. 9A.
- FIG. 10A An explanatory view showing a third step of the method for manufacturing a dust core in one embodiment of the present invention, which is a plan view in a state where two stator core parts are stacked.
- FIG. 10B is an explanatory view showing a third step of the method for manufacturing a dust core in one embodiment of the present invention, and is a schematic sectional view taken along the line XB-XB in FIG. 10A.
- FIG. 11A is an explanatory view showing a fourth step of the method for manufacturing a dust core in one embodiment of the present invention, and is a plan view in a state where the coil is wound.
- FIG. 11B is an explanatory view showing a fourth step of the method for manufacturing a dust core in one embodiment of the present invention, and is a schematic sectional view taken along the line XIB-XIB of FIG. 11A.
- FIG. 12 VIIIB—VIII of FIG. 8 (a) when the teeth forming part is movable vertically.
- FIG. 13 VIIIB—VIII in FIG. 8 (a) when the teeth forming portion is movable in the vertical direction It is a fragmentary sectional view of another teeth part formation part corresponding to a section which meets a B line.
- FIG. 14A is a view showing a cross-sectional shape of a tooth portion formed using the mold of FIG. 13.
- FIG. 14B is a view showing a cross-sectional shape of a tooth portion formed by using the mold of FIG. 13.
- FIG. 15 is a view for explaining a state where another stator core component is sandwiched between two stator core components.
- FIG. 16 is a view for explaining unevenness or an arrangement position of a bolt insertion portion.
- FIG. 17 is a view for explaining unevenness or another arrangement position of the bolt insertion portion.
- FIG. 18 is a perspective view showing a method for manufacturing the stator core disclosed in Patent Document 1.
- FIG. 19 is a view for explaining a problem of the stator core disclosed in Patent Document 1.
- FIG. 20 is a schematic perspective view showing a state where an overhang has occurred.
- FIG. 21 is a schematic cross-sectional view for explaining a problem caused by the corners of the teeth being angular.
- FIG. 1 is a plan view of an electric motor having a stator core according to an embodiment of the present invention.
- FIG. 2 is a schematic cross-sectional view taken along the line II in FIG.
- FIG. 3 is a schematic sectional view taken along the line III-III of FIG.
- FIG. 4 is a partially cutaway perspective view showing the configuration of the stator core component.
- electric motor 1 includes a ring-shaped stator core 10 and a columnar rotor core 11 arranged on the inner peripheral side of stator core 10.
- the rotor core 11 has a rotating shaft 13 at the center. The rotation of the rotor core 11 about the rotation axis 13 The rotational motion is output from the motive 1.
- Permanent magnets 12 are embedded in the periphery of the rotor core 11 at predetermined angles.
- Stator core 10 is formed by joining a plurality of soft magnetic particles together.
- stator core 10 is formed by stacking two stator core components 5 in the thickness direction (the direction of arrow A).
- the two stator core components 5, 5 have the same planar shape as each other.
- each of two stator core components 5, 5 is provided with a yoke portion 4 extending in a circumferentially annular shape and a radially inner circumferential side of yoke portion 4 from yoke portion 4. It has a plurality of teeth portions 2 protruding at substantially equal intervals, and a flange portion 3 that protrudes in the circumferential direction at the tip of the protruding portion of each of the plurality of teeth portions 2.
- the yoke part 4, the teeth part 2, and the flange part 3 are integrally formed.
- the lower surfaces of the yoke 4, the teeth 2, and the flange 3 form flat surfaces.
- the dimension T1 of the tooth portion 2 in the thickness direction A is smaller than the dimension T2 of the yoke portion 4 in the thickness direction A.
- the upper surface of the teeth portion 2 is positioned lower and level (that is, the lower surface side) in the thickness direction A than the upper surfaces of the yoke portion 4 and the flange portion 3! /.
- coil 6 is wound around teeth portion 2 of two stacked stator core components 5, 5.
- the coil 6 is formed by a helically extending conductor covered with an insulating coating.
- the conductor is wound in multiple layers in such a direction that the surface force of the teeth 2 is also separated.
- the conducting wire is formed of, for example, copper copper, and has a diameter of about 0.3 mm to 3 mm.
- the insulating film is made of, for example, general enamel, and has a thickness of about 30 / zm.
- the coil 6 is disposed so as to be sandwiched between the yoke 4 and the flange 3, whereby the position of the coil 6 with respect to the teeth 2 is fixed.
- the corner portion C of the tooth portion 2 around which the coil 6 is wound has a round shape, and the radius of curvature R of each corner portion C is W, where W is the width of the tooth portion 2. Then, for example, it is more preferably 0.3 mm or more and WZ2 or less.
- the round shape of the present invention is not limited to such a case.
- the shape may be an ellipse as shown in FIG. 5A or a shape in which the vertices of a square are rounded off as shown in FIG. 5B. In this case, when the coil is prevented from being damaged, the above-described effect can be obtained.
- FIG. 6 is an enlarged schematic diagram showing the structure of the surface of the stator core in FIG.
- a plurality of soft magnetic particles 23 forming stator core 10 include metal magnetic particles 21 and insulating coating 22 surrounding the surface of metal magnetic particles 21.
- An organic substance 24 is interposed between the plurality of soft magnetic particles 23.
- Each of the soft magnetic particles 23 is joined by an organic substance 24 or joined by combining unevenness of the soft magnetic particles 23.
- Metal magnetic particles 21 include, for example, iron (Fe), iron (Fe) silicon (Si) -based alloy, iron (Fe) -nitrogen (N) -based alloy, iron (Fe) nickel (Ni) -based alloy, Iron (Fe) —Carbon (C) alloy, Iron (Fe) Boron (B) alloy, Iron (Fe) Cobalt (Co) alloy, Iron (Fe) Phosphorus (P) alloy, Iron (Fe) -Nickel (Ni)-cobalt (Co) based alloy and iron (Fe)-aluminum (A1)-silicon (Si) based alloy can also be formed.
- the metal magnetic particles 21 may be a single metal or an alloy.
- the insulating coating 22 is formed, for example, by subjecting the metal magnetic particles 21 to a phosphoric acid treatment. Also, preferably, the insulating coating 22 contains an oxide.
- the insulating film 22 containing this oxide includes iron phosphate containing phosphorus and iron, manganese phosphate, zinc phosphate, calcium phosphate, aluminum phosphate, silicon oxide, titanium oxide, aluminum oxide, and the like. Can be an insulator made of an oxide such as zirconium oxide.
- the insulating film 22 may be formed as a single layer as shown in the figure, or may be formed as a multi-layer.
- the insulating coating 22 functions as an insulating layer between the metal magnetic particles 21.
- the electric resistivity p of the stator core 10 can be increased. Thereby, it is possible to suppress the eddy current from flowing between the metal magnetic particles 21 and reduce the iron loss caused by the eddy current.
- Examples of the organic substance 24 include thermoplastic polyimides, thermoplastic polyamides, thermoplastic polyamide imidos, polyphenylene sulfides, polyamide imides, polyether sulfones, polyether imides, and polyether ether ketones; Wholly aromatic polyester , Non-thermoplastic resins such as wholly aromatic polyimides or high molecular weight polyethylene, and higher fatty acids such as zinc stearate, lithium stearate, calcium stearate, lithium palmitate, calcium palmitate, lithium oleate or calcium oleate. Can be used. Further, these can be used as a mixture with each other. In addition
- the high molecular weight polyethylene means a polyethylene having a molecular weight of 100,000 or more.
- the organic substance 24 firmly joins the plurality of soft magnetic particles 23 to improve the strength of the stator core 10. Further, the organic substance 24 functions as a lubricant during pressure molding for obtaining the stator core 10. This prevents the soft magnetic particles 23 from rubbing against each other and destroying the insulating coating 22.
- FIG. 7 is a schematic cross-sectional view showing, in an enlarged manner, the vicinity of a joint portion between two stator core components 5 in a region S in FIG. Referring to FIG. 7, a junction 32 between two stator core components 5 has a boundary portion 32 due to the junction.
- each of the two stator core components 5, 5 is formed by pressure molding, the surface roughness of the joining surface 31 of each of the two stator core components 5, 5 is determined by the metal used in the pressure molding. Reflects the surface roughness of the mold. Specifically, since the surface roughness Ry of the mold is usually equal to or less than 0, the surface roughness Ry of the joint surface 31 of each of the two stator core components 5 is equal to or less than 3 m. The surface roughness Ry means the maximum height Ry.
- an adhesive layer 33 such as a thermoplastic polyamide shown in the drawing may be formed at the boundary 32, and the boundary 32 may be formed. May have space.
- FIG. 8 to FIG. 11B are explanatory views showing a method of manufacturing a dust core in one embodiment of the present invention in the order of steps.
- FIG. 8A is a plan view of a mold die
- FIG. 8B is a schematic cross-sectional view corresponding to a cross section taken along line VIIIB-VIIIB in FIG. 8A
- FIG. 8 (c) is a schematic cross-sectional view corresponding to the cross section along the VinC-VinC line in FIG. 8 (a).
- FIG. 9A is a plan view of a stator core component
- FIG. 9B is a schematic sectional view taken along line IXB-IXB of FIG. 9A.
- FIG.10A shows a flat state in which two stator core parts are stacked.
- FIG. 10B is a schematic sectional view taken along line XB-XB in FIG. 10A.
- FIG. 11A is a plan view in a state where the coil is wound, and FIG. 11B is a schematic cross-sectional view along the line XIB-XIB in FIG. 11A.
- a mold for manufacturing a stator core component is prepared.
- This mold has a die 51, a lower punch 53a for forming a yoke portion, a lower punch 53b for forming a flange portion, a tooth portion forming portion 52, and an upper punch 54 as shown in FIG. 8 (b).
- the lower punch 53 a for forming the yoke portion, the lower punch 53 b for forming the flange portion, and the upper punch 54 can move upward and downward with respect to the die 51.
- the teeth forming section 52 is fixed with respect to the position of the die 51 and does not move. Even if the lower punch 53b is integral with the teeth part forming part 52, it does not work.
- the tooth portion forming portion 52 has grooves 52a arranged at substantially equal intervals in the circumferential direction as shown in Fig. 8 (c), and the lower end corner of each groove 52a has a round shape. I have.
- the radius of curvature R of the corner is more preferably, for example, 0.3 mm or more and WZ2 or less when the width of the groove 52a is W. .
- pressure molding is performed at a pressure of, for example, 700 MPa to 1500 MPa.
- the pressure molding atmosphere is preferably an inert gas atmosphere or a reduced pressure atmosphere. In this case, the oxidation of the soft magnetic powder 35 by oxygen in the atmosphere can be suppressed.
- the yoke portion is pressed from above and below by the yoke portion forming lower punch 53a and the upper punch 54, and the flange portion is vertically moved by the flange portion forming lower punch 53b and the upper punch 54. Pressed from the direction.
- the tooth portion is pressed from above by the upper punch 54 between the tooth portion forming portion 52 and the upper punch 54.
- soft magnetic powder is compressed by the above-described pressure molding, and yoke portion 4 extending in the circumferential annular shape, and radially inner periphery of yoke portion 4 from yoke portion 4
- a stator core component 5 having a plurality of teeth 2 projecting at substantially equal intervals to the side and a flange 3 projecting in the circumferential direction at the tip of each of the plurality of teeth 2 is formed.
- corner portion of the tooth portion 2 is formed to have a round shape.
- stator core component 5 heat treatment is performed on stator core component 5 at a temperature lower than the thermal decomposition temperature of insulating coating 22 of soft magnetic particles 23.
- the heat treatment is performed at a temperature of 400 ° C. or more and less than 500 ° C. for one hour or more.
- the heat treatment is performed at such a high temperature, distortion and dislocation existing inside the molded body can be removed, and the magnetic properties of the stator core component 5 can be significantly improved.
- the insulating film 22 does not deteriorate due to the heat treatment.
- stator core components 5 obtained as described above are prepared, and they are stacked and joined in the thickness direction. This joining is performed by, for example, fixing with bolts, fixing by fitting unevenness, bonding using resin, or the like.
- the stator core 10 is formed by the above-described joining.
- the joining surface of the stator core components 5 may be ground to obtain a flat portion. Further, after joining the stator core components 5 together, a portion of the flange portion 3 facing the rotor can be cut to secure a gap with the rotor portion.
- coil 6 is wound around teeth portion 2 of stator core 10.
- the coil 6 is spirally wound using a conductor covered with an insulating coating. Through the steps described above, the stator core 10 around which the coil 6 shown in FIG. 1 is wound is completed.
- stator core components 5, 5 are stacked in the thickness direction and are not divided in the circumferential direction. Therefore, each yoke portion 4 of the two stator core components 5, 5 does not have a joint between the stator core components 5 in the circumferential direction as shown in FIG. Therefore, even when the magnetic lines of force are generated in each of the yoke portions 4, the magnetic lines of force extending in the circumferential direction do not pass through the gap at the joint. Therefore, good magnetic characteristics can be obtained without deterioration of the magnetic characteristics due to the magnetic field lines passing through the gap at the joint.
- the mold used for press-molding the stator core component 5 is at least divided into a tooth portion forming portion 52 and a yoke portion forming lower punch 53a.
- the lower punch 53 a for forming a yoke portion is fixed to the die 51 and is movable with respect to the die 51. This makes it possible to process the teeth 2 into a desired shape while securing the strength of the teeth forming section 52 even when the corners of the teeth 2 are rounded. Hereinafter, this will be described.
- FIG. 12 is a partial cross-sectional view of the tooth portion forming portion corresponding to a cross section taken along line VIIIB-VIIIB in FIG. 8A when the tooth portion forming portion is movable in the vertical direction.
- the tip portion the portion indicated by the area P1 of the tooth portion forming portion 152b becomes thin.
- the tip may be damaged due to the pressure during pressure molding.
- the strength of the teeth portion forming portion 52 can be secured by not moving the teeth portion forming portion 52 fixed to the die 51. It is possible to prevent the tip portion of the tooth forming portion from being damaged (the damage described with reference to FIG. 12), and to form the tooth portion 2 having a desired shape without the protrusion 2a shown in FIG.
- stator core 10 is connected to the two stator core components 5. Force described in the case of stacked configuration As shown in Fig. 15, one or more other stator core components 5a are sandwiched between two stator core components 5 and stacked to form a stator core 10. Is also good.
- the other stator core component 5a has the same planar shape as stator core component 5, and has a shape in which the cross section of the yoke portion and the tooth portion is straight (that is, the shape of joint surface 5al is flat). are doing.
- the two dimensions of the stator core component 5 in the thickness direction are increased in order to increase the size of the stator core 10 in the thickness direction, a density distribution occurs in the thickness direction when these are formed by pressing. There is fear. Therefore, by sandwiching another stator core component 5a between the two stator core components 5, the thickness dimension of the stator core 10 in the thickness direction can be largely adjusted without increasing the thickness dimension of the two stator core components 5. It becomes possible. In addition, since it is not necessary to increase the size of the two stator core components 5 in the thickness direction, the density distribution of the stator core components 5 in the thickness direction can be suppressed as small as possible.
- the concave and convex portions or the insertion portions of the bolts need to be provided on each of the two stator core parts 5.
- the unevenness 20 or the bolt insertion portion 20 is located on the side of the yoke portion 4 where the teeth portion 2 is located between the inner end surface 4d and the outer end surface 4e (this embodiment). In the embodiment, it is preferably provided near an end surface opposite to the inner peripheral end surface 4d) (in this embodiment, the outer peripheral end surface 4e).
- lines of magnetic force are generated so as to extend from the teeth 2 to the yoke 4, and also the four yokes 4 extend to the teeth 2, so that the vicinity of the end surface of the yoke 4 on the side where the teeth 2 are located (In this embodiment, the magnetic force lines are present near the inner end surface 4d).
- the unevenness 20 or the bolt insertion portion 20 is arranged in the region where the lines of magnetic force exist, the magnetic characteristics may be degraded. Therefore, by arranging the unevenness 20 or the bolt insertion portion 20 near the end face opposite to the side where the teeth portion 2 is located (in the present embodiment, near the end face 4e on the outer peripheral side), deterioration of magnetic characteristics is reduced. It is possible to fix the two stator core parts 5 while preventing them.
- the unevenness 20 or the bolt insertion portion 20 is provided between the one end Q1 of the base of the teeth portion 2 and the other end Q1.
- the arc is arranged in the area (hatched area) 4a of the yoke 4 on the outer peripheral side of the two arcs.
- the width L2 of the yoke portion 4 is smaller than the width L1 of the teeth portion 2, as shown in FIG. 17, the side where the teeth portion 2 is located (in this embodiment, the inner peripheral end surface 4d).
- Is provided on the end surface on the opposite side (the end surface 4e on the outer peripheral side in this embodiment) of the yoke 4, and the protrusions 4b are provided with the projections and recesses 20 or the bolt insertion portions 20. preferable.
- the force described for the configuration of the inner rotor in which the rotor core 11 is located on the inner peripheral side of the stator core 10 The present invention provides an outer rotor in which the rotor core is located on the outer peripheral side of the stator core. The same can be applied to the above configuration.
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- Manufacturing & Machinery (AREA)
- Iron Core Of Rotating Electric Machines (AREA)
- Manufacture Of Motors, Generators (AREA)
Abstract
Description
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US (1) | US7608968B2 (ja) |
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JP2007119860A (ja) * | 2005-10-28 | 2007-05-17 | Hitachi Powdered Metals Co Ltd | モータ用コアの金型 |
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US7701106B2 (en) | 2003-06-21 | 2010-04-20 | Oilfield Equipment Development Center Limited | Electric submersible pumps |
GB0314550D0 (en) | 2003-06-21 | 2003-07-30 | Weatherford Lamb | Electric submersible pumps |
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- 2005-04-25 WO PCT/JP2005/007780 patent/WO2005107039A1/ja active Application Filing
- 2005-04-25 US US11/587,978 patent/US7608968B2/en not_active Expired - Fee Related
- 2005-04-25 JP JP2006512769A patent/JPWO2005107038A1/ja not_active Withdrawn
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Also Published As
Publication number | Publication date |
---|---|
US7608968B2 (en) | 2009-10-27 |
EP1742327A4 (en) | 2012-07-04 |
JPWO2005107038A1 (ja) | 2008-03-21 |
WO2005107039A1 (ja) | 2005-11-10 |
US20080067887A1 (en) | 2008-03-20 |
EP1742327A1 (en) | 2007-01-10 |
JPWO2005107039A1 (ja) | 2008-03-21 |
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