US20020047461A1 - Stacked layered core and method for manufacturing the same - Google Patents
Stacked layered core and method for manufacturing the same Download PDFInfo
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- US20020047461A1 US20020047461A1 US09/848,115 US84811501A US2002047461A1 US 20020047461 A1 US20020047461 A1 US 20020047461A1 US 84811501 A US84811501 A US 84811501A US 2002047461 A1 US2002047461 A1 US 2002047461A1
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- core
- section
- connection base
- stacked layered
- base section
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Classifications
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- 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
-
- 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
- H02K15/12—Impregnating, heating or drying of windings, stators, rotors or machines
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K3/00—Details of windings
- H02K3/32—Windings characterised by the shape, form or construction of the insulation
- H02K3/34—Windings characterised by the shape, form or construction of the insulation between conductors or between conductor and core, e.g. slot insulation
- H02K3/345—Windings characterised by the shape, form or construction of the insulation between conductors or between conductor and core, e.g. slot insulation between conductor and core, e.g. slot insulation
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K3/00—Details of windings
- H02K3/32—Windings characterised by the shape, form or construction of the insulation
- H02K3/38—Windings characterised by the shape, form or construction of the insulation around winding heads, equalising connectors, or connections thereto
-
- 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
-
- 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
- Y10T29/4902—Electromagnet, transformer or inductor
- Y10T29/49073—Electromagnet, transformer or inductor by assembling coil and core
-
- 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
- Y10T29/4902—Electromagnet, transformer or inductor
- Y10T29/49075—Electromagnet, transformer or inductor including permanent magnet or core
- Y10T29/49078—Laminated
Definitions
- the present invention relates to a stacked layered core used in a variety of motors and a method for manufacturing the stacked layered core, and more particularly, to a stacked layered core having a stacked core body including a plurality of core plates stacked together and a dielectric film coated over an external surface of the stacked core body and a method for manufacturing the same.
- a fixing-side peripheral surface 1 c on the internal peripheral side of the circular connection base section 1 a i.e., an internal bore of the circular connection base section 1 a , engages a holder (not shown) whereby the stacked layered core is affixed to the holder.
- a dielectric film is coated over an external surface of the stacked layered core C by a powder painting or an electrodeposition painting.
- Driving coils (not shown) are wound about the salient pole sections 1 b over the dielectric film.
- a core retaining jig 2 shown in FIG. 5 and FIG. 6 is used to support the entire body of the stacked layered core C. More concretely, the core retaining jig 2 has a boss section 2 a and three protruded sections 2 b radially protruding from the boss section 2 a.
- the protruded sections 2 b of the core retaining jib 2 are abutted to the internal surface of the connection base section 1 a of the stacked layered core C, in other words, to the fixing-side peripheral surface 1 c provided on a side opposite to the side where the protruded salient poles 1 b protrude, whereby the entire body of the staked layered core C is supported by the core retaining jig 2 .
- one pair of shaft sections 2 c provided on both sides of the boss section 2 a of the core retaining jig 2 are set at a pair of screw conveyors 3 , 3 provided in a painting apparatus, as shown in FIG. 5.
- the screw conveyors 3 are rotatably driven to transfer the stacked layered core C together with the core retaining jig 2 , to paint a dielectric film as described above.
- the protruded sections 2 b of the core retaining jig 2 are in contact with the fixing-side internal peripheral surface 1 c of the circular connection base section 1 a of the stacked layered core C.
- a bump 4 a of the dielectric film 4 is formed in the form of a bur.
- portions that have been in contact with the protruded sections 2 b of the core retaining jig 2 would not be painted with the dielectric film 4 , and therefore would remain to be exposed. Such portions would likely be rusted. Accordingly, a sealing material such as an adhesive may be used to cover the non-painted portions depending on the requirements. However, in this case, the sealing material may form bumps, which results in irregular internal diameters in the internal bore of the stacked layered core C.
- the bump portions of the dielectric coating film and the damaged portions do not affect the diametrical dimensions of the stacked layered core at all when the connection base section of the stacked layer core is affixed to a bearing holder of a motor, and therefore the productivity of stacked layered cores can be improved.
- FIG. 1 shows a plan view of a core plate of a stacked layered core for motor in accordance with one embodiment of the present intention.
- FIG. 2 is an illustration to describe the state in which a core retaining jig supports a stacked layered core that is composed of the core plates shown FIG. 1.
- FIG. 3 shows an enlarged side view of a portion of a supporting concave section of the stacked layered core shown in FIG. 2.
- FIG. 4 shows a side view illustrating the state in which a sealing material is coated on the portion of the supporting concave section of the stacked layered core shown in FIG. 2.
- FIG. 5 shows a plan view of an example of a core retaining jig.
- FIG. 6 shows a side view of the core retaining jig shown in FIG. 5.
- FIG. 7 shows a cross-sectional view of an exemplary structure of a motor for a hard drive apparatus equipped with a stacked layered core in accordance with the present invention.
- FIG. 8 shows a plan view of a core plate for an ordinary stacked layered core.
- FIG. 9 shows a cross-sectional view of a stacked layered core composed of the core plates shown in FIG. 8.
- FIG. 10 shows an enlarged side view of a portion of the ordinary stacked layered core shown in FIG. 8 and FIG. 9 supported by the core retaining jig after painting is performed.
- FIG. 11 shows a side view of the portion of the ordinary stacked layered core after the core retaining jig shown in FIG. 10 is removed.
- a stacked layered core for an inner-rotor type motor in accordance with one embodiment of the present intention is described below with reference to the accompanying drawings.
- HDD hard disk driving apparatus
- FIG. 7 shows a spindle motor for a HDD with a rotary shaft 2 that is generally formed from a stator assembly 10 that defines a fixing member, and a rotor assembly 20 that defines a rotator member that is assembled with respect to the stator assembly 10 .
- the stator assembly 10 has a fixing frame 11 that is fixedly screwed to a fixing base (not shown).
- the fixing frame 11 may be formed from an aluminum metal material in order to reduce its weight.
- a bearing holder 12 in a circular shape extends generally vertically about a center of the fixing frame 11 .
- a bearing sleeve 13 that defines a fixed bearing member in a tubular cylindrical form is connected to the bearing holder 12 by a pressure insertion method or a shrink-fit method.
- the bearing sleeve 13 may be formed from a copper alloy material such as phosphorous bronze in order to facilitate the work to form holes of small diameters.
- a stacked layered stator core 14 in accordance with one embodiment of the present invention is formed from a body of stacked core plates that are formed from electromagnetic steel plates.
- the stacked layered stator core 14 is attached to an external peripheral mounting surface of the bearing holder 12 .
- the stacked layered stator core 14 is formed by stacking in layers a plurality of core plates 14 a shown in FIG. 1.
- the stacked layered stator core 14 has a circular connection base section 14 a 1 and a plurality of salient pole sections 14 a 2 that radially and outwardly protrude from the circular connection base section 14 a 1 .
- the circular connection base section 14 a 1 is generally formed in the shape of a ring defining a central bore. Slots 14 a 3 are provided between adjacent ones of the salient pole sections 14 a 2 .
- a dielectric film composed of a predetermined dielectric material is formed over the entire surface of the stacked layered stator core 14 a that is formed from the core plates 14 a described above.
- Driving coils 15 are wound around the respective salient pole sections 14 a 2 over the dielectric film using the slots 14 a 3 .
- the bearing sleeve 13 has a bearing bore hole formed in a center thereof, and a rotary shaft 21 that forms the rotor assembly 20 is rotatably inserted in the bearing bore hole.
- a radial dynamic pressure bearing section RB is formed in a gap between a surface of the rotary shaft 21 and an internal peripheral surface of the bearing bore hole of the bearing sleeve 13 .
- a plate-shaped thrust plate 23 is fixedly attached to a lower end of the rotary shaft 21 .
- a counter plate 16 is provided at a lower end section of the bearing sleeve 13 .
- Thrust dynamic pressure bearing sections SBa and SBb are formed between the thrust plate 23 and the bearing sleeve 13 and between the thrust plate 23 and the counter plate 16 , respectively.
- the rotor hub 22 has a coupling hole 22 d provided at its center. An upper end portion of the rotary shaft 21 is coupled to the coupling hole 22 d by pressure insertion or shrink-fit to connect the rotor hub 22 and the rotary shaft 21 in one body.
- the rotor hub 22 has a generally cylindrical body portion 22 a for mounting a recording media disk on its outer peripheral section, and a circular driving magnet 22 c attached through a back yolk 22 b to an internal wall surface in the lower side of the body section 22 a, as shown in the figure.
- the circular driving magnet 22 c is disposed in proximity to and circularly opposing to an external peripheral side surface of the stator core 14 .
- the stacked layered core 14 having the structure described above may be used for a spindle motor for HDDs.
- the stacked layered core 14 is formed by successively stacking in layers a plurality of core plates 14 a , each having the shape shown in FIG. 1, as described above.
- supporting recessed sections 14 a 5 are provided at three locations at generally equal intervals on an inner peripheral surface of the circular connection based section 14 a 1 of the stacked layered core 14 .
- the supporting recessed sections 14 a 5 are provided on an inner peripheral fixing surface 14 a 4 of the central hole of the circular connection based section 14 a 1 of the stacked layered core 14 on the opposite side of the salient pole sections 14 a 2 .
- the three supporting recessed sections 14 a 5 are formed in a manner to respectively correspond to three protruded sections 2 b that are provided on a core retaining jig 2 (see FIG. 5 and FIG. 6) that is used in the process of forming a dielectric film.
- Each of the supporting recessed sections forms a concave groove extending in the axial direction and having a rectangular cross-section in the stacked layered stator core 17 (see FIG. 7) that is formed by stacking in layers the core plates 14 a.
- a bump portion 14 a 7 of the dielectric film 14 a 6 may be formed at the bottom section of the groove that is brought in contact with a tip section of the protruded section 2 b of the core retaining jig 2 .
- the bump portion 14 a 7 has a height h 1
- the groove is formed in a manner that the groove depth d is greater than the height h 1 (i.e., d>h 1 ).
- the tip portion of the protruded section 2 b of the core retaining jig 2 may preferably abut to the bottom portion of the concave groove 14 a 5 in a central area of the bottom portion of the concave groove 14 a 5 .
- a sloped guide face may preferably be provided in a manner that the groove depth d becomes the maximum at the central area of the bottom portion of the groove.
- each of the protruded sections 2 b of the core retaining jig 2 supports the stacked layered stator core 14 at the central area of the bottom portion of the concave groove 14 a 5 .
- the protruded section 2 b of the core retaining jig 2 can avoid contact with an inside surface of the concave groove 14 a 8 .
- the supporting concave groove 14 a 5 of the present embodiment defining a concave groove is formed in a manner capable of storing a sealing material 14 a 8 to cover portions where the dielectric film 14 a 6 is not formed due to the protruded section 2 b of the core retaining jig 2 contacting the bottom portion of the concave groove.
- the groove depth d of the supporting concave groove 14 a 5 is greater than a height h 2 of the sealing material 14 a 8 (i.e., d>h 2 >h 1 ).
- the core retaining jig 2 describe above is used to support the entire body of the stacked layered stator core 14 .
- the tip end portions of the three protruded sections 2 b of the core retaining jig 2 are brought in contact with the bottom portions of the respective three supporting concave grooves 14 a 5 provided on the inner peripheral fixing surface 14 a 4 of the circular connection based section 14 a 1 of the stack layered stator core 14 .
- the entire body of the stacked layered stator core 14 is supported by the core retaining jig 2 .
- the shaft sections 2 c of the core retaining jig 2 that supports the stacked layered stator core 14 are mounted on a pair of screw conveyors 3 provided in a painting apparatus shown in FIG. 5. As the screw conveyors 3 are rotatably driven, the core retaining jig 2 is transferred in one direction together with the stack layered stator core 14 to perform a coat-paining of the dielectric film 14 a 6 .
- the protruded sections 2 b of the core retaining jig 2 are in contact with the bottom portions provided inside the supporting groove sections 14 a 5 of the circular connection based section 14 a 1 of the stacked layered stator core 14 .
- the bump section 14 a 7 of the dielectric coating film 14 a 6 in the form of a bur which is formed in the groove section that contacts the protruded section 2 b of the core retaining jig 2 , is formed receded inside the supporting groove section 14 a 5 . Therefore, the bump section 14 a 7 does not affect the inner peripheral fixing surface 14 a 4 of the circular connection base section 14 a 1 for retaining the stacked layered stator core 14 or the internal diameter thereof.
- the sealing material 14 a 8 for rust prevention when a sealing material 14 a 8 for rust prevention is coated over the bottom sections of the grooves that are in contact with the protruded sections 2 b of the core retaining jig 2 , the sealing material 14 a 8 deposits receded inside the supporting concave sections 14 a 5 .
- the sealing material 14 a 8 does not affect the inner peripheral fixing surface 14 a 4 of the circular connection base section 14 a 1 or the internal diameter thereof.
- the supporting concave sections 14 a 5 can be used as positional markers for the coating work, and therefore an improved workability is attained.
- the president invention is applied to an inner-rotor type stacked layered core.
- the president invention is likewise applicable to an outer-rotor type stacked layered core that has a circular connection base section in which salient poles protrude inwardly from an inner surface of the circular connection base section.
- supporting groove sections 14 a 5 are provided on an outer peripheral surface of the circular connection base section.
- the present invention is not limited to a motor for a hard disk drive (HDD) such as the one described in the above embodiment, but is likewise applicable to a variety of other motors and generators.
- HDD hard disk drive
- the protruded sections of the core retaining jig are brought in contact with the interior of the supporting concave sections provided in the core circular connection base section of the stacked layered core.
- bumps of the dielectric coating film that may be generated at locations where the protruded sections of the core retaining jig are in contact with the concave sections do not protrude from the supporting concave sections.
- the supporting concave sections may be formed in a manner that, when a sealing material for rust prevention is coated over portions that are in contact with the protruded sections of the core retaining jig, the sealing material is formed receded inside the supporting concave sections such that the sealing material does not protrude from the concave sections.
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
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- Iron Core Of Rotating Electric Machines (AREA)
- Manufacture Of Motors, Generators (AREA)
- Insulation, Fastening Of Motor, Generator Windings (AREA)
Abstract
Description
- 1. Field of the Invention
- The present invention relates to a stacked layered core used in a variety of motors and a method for manufacturing the stacked layered core, and more particularly, to a stacked layered core having a stacked core body including a plurality of core plates stacked together and a dielectric film coated over an external surface of the stacked core body and a method for manufacturing the same.
- 2. Related Art
- Generally, a stacked layered core used in a variety of motors is formed from a plurality of thin plate-like core plates1 shown in FIG. 8, for example, that are stacked together, as shown in FIG. 9. FIGS. 8 and 9 show a stacked layered core C for an outer rotor type motor, and core plates 1 that compose the stacked layered core C. The stacked layered core has a circular connection based
section 1 a provided at a central portion thereof and a plurality ofsalient pole sections 1 b that are outwardly, radially extending in a radial direction from an outer peripheral surface of the circular connection basedsection 1 a. A fixing-sideperipheral surface 1 c on the internal peripheral side of the circularconnection base section 1 a, i.e., an internal bore of the circularconnection base section 1 a, engages a holder (not shown) whereby the stacked layered core is affixed to the holder. - A dielectric film is coated over an external surface of the stacked layered core C by a powder painting or an electrodeposition painting. Driving coils (not shown) are wound about the
salient pole sections 1 b over the dielectric film. When the dielectric film is formed, acore retaining jig 2 shown in FIG. 5 and FIG. 6 is used to support the entire body of the stacked layered core C. More concretely, thecore retaining jig 2 has aboss section 2 a and threeprotruded sections 2 b radially protruding from theboss section 2 a. - The
protruded sections 2 b of thecore retaining jib 2 are abutted to the internal surface of theconnection base section 1 a of the stacked layered core C, in other words, to the fixing-sideperipheral surface 1 c provided on a side opposite to the side where the protrudedsalient poles 1 b protrude, whereby the entire body of the staked layered core C is supported by thecore retaining jig 2. - Then, one pair of shaft sections2 c provided on both sides of the
boss section 2 a of thecore retaining jig 2 are set at a pair of screw conveyors 3, 3 provided in a painting apparatus, as shown in FIG. 5. Then, the screw conveyors 3 are rotatably driven to transfer the stacked layered core C together with thecore retaining jig 2, to paint a dielectric film as described above. At this moment, as shown in FIG. 10, theprotruded sections 2 b of thecore retaining jig 2 are in contact with the fixing-side internalperipheral surface 1 c of the circularconnection base section 1 a of the stacked layered core C. When the painting of thedielectric film 4 is completed, one of theprotruded sections 2 b that is capable of moving in a radial direction is pushed toward the center of thecore retaining jig 2. As a result, the other twoprotruded sections 2 b are separated from the fixing-side internalperipheral surface 1 c as shown in FIG. 11, such that thecore retaining jig 2 can be removed from the stacked layered core C. - However, at a portion of the stacked layered core C from where the
core retaining jig 2 is removed, in other words, at a portion of the stacked layered core C that has been in contact with each of theprotruded sections 2 b, abump 4 a of thedielectric film 4 is formed in the form of a bur. - Therefore, in order to maintain the internal dimension of the fixing-side internal
peripheral surface 1 c of the stacked layered core C at a high precision level, a finishing process in which thebump sections 4 a are removed or compressed needs to be performed. Also, when thecore retaining jig 2 is removed, each of theprotruded sections 2 b of thecore retaining jig 2 may come in contact with various portions of the stacked layered core C, with the result that thedielectric film 4 may be cut or scratched, which is the major cause of poor paint quality. - Furthermore, portions that have been in contact with the
protruded sections 2 b of thecore retaining jig 2 would not be painted with thedielectric film 4, and therefore would remain to be exposed. Such portions would likely be rusted. Accordingly, a sealing material such as an adhesive may be used to cover the non-painted portions depending on the requirements. However, in this case, the sealing material may form bumps, which results in irregular internal diameters in the internal bore of the stacked layered core C. - It is an object of the present intention to provide a stacked layered core in which a dielectric film can be readily formed at a high precision and a method for manufacturing the same.
- In accordance with one embodiment of the present invention, a stacked layered core may include a core body formed from a plurality of core plates stacked in layers, each of the core plates having a connection base section formed in a circular shape and a plurality of salient pole sections radially extending from an external peripheral surface of an internal peripheral surface of the connection base. The circular connection base section has a fixing-side peripheral surface on the opposite side of the salient pole sections. At least one retaining recessed section is provided in the fixing-side peripheral surface of the connection base section. A dielectric film is formed over an external surface of the core body. In one aspect of the present invention, the retaining recessed section has a depth greater than a thickness of a bump portion of the dielectric film that may be formed in the retaining recessed section such that the bump portion of the dielectric film is contained inside the retaining recessed section.
- In accordance with the present invention, even when bump portions of the dielectric coating film may be formed, they are formed inside the retaining recessed section and therefore do not protrude from the supporting recessed sections. Furthermore, although damages may be caused by protruded sections of a core retaining jig that is used to support the stacked layered core when the core retaining jig is removed, such damages are generated only inside the retaining recessed sections formed in the connection base section of the stacked layered core. Therefore, the bump portions of the dielectric coating film and the damaged portions do not affect the diametrical dimensions of the stacked layered core at all when the connection base section of the stacked layer core is affixed to a bearing holder of a motor, and therefore the productivity of stacked layered cores can be improved.
- Other features and advantages of the invention will be apparent from the following detailed description, taken in conjunction with the accompanying drawings that illustrate, by way of example, various features of embodiments of the invention.
- FIG. 1 shows a plan view of a core plate of a stacked layered core for motor in accordance with one embodiment of the present intention.
- FIG. 2 is an illustration to describe the state in which a core retaining jig supports a stacked layered core that is composed of the core plates shown FIG. 1.
- FIG. 3 shows an enlarged side view of a portion of a supporting concave section of the stacked layered core shown in FIG. 2.
- FIG. 4 shows a side view illustrating the state in which a sealing material is coated on the portion of the supporting concave section of the stacked layered core shown in FIG. 2.
- FIG. 5 shows a plan view of an example of a core retaining jig.
- FIG. 6 shows a side view of the core retaining jig shown in FIG. 5.
- FIG. 7 shows a cross-sectional view of an exemplary structure of a motor for a hard drive apparatus equipped with a stacked layered core in accordance with the present invention.
- FIG. 8 shows a plan view of a core plate for an ordinary stacked layered core.
- FIG. 9 shows a cross-sectional view of a stacked layered core composed of the core plates shown in FIG. 8.
- FIG. 10 shows an enlarged side view of a portion of the ordinary stacked layered core shown in FIG. 8 and FIG. 9 supported by the core retaining jig after painting is performed.
- FIG. 11 shows a side view of the portion of the ordinary stacked layered core after the core retaining jig shown in FIG. 10 is removed.
- A stacked layered core for an inner-rotor type motor in accordance with one embodiment of the present intention is described below with reference to the accompanying drawings. Prior to the description, an overall structure of a hard disk driving apparatus (HDD) equipped with a motor having a stacked layered core in accordance with one embodiment of the present intention is described below with reference to the accompanying drawing.
- FIG. 7 shows a spindle motor for a HDD with a
rotary shaft 2 that is generally formed from astator assembly 10 that defines a fixing member, and arotor assembly 20 that defines a rotator member that is assembled with respect to thestator assembly 10. Thestator assembly 10 has afixing frame 11 that is fixedly screwed to a fixing base (not shown). Thefixing frame 11 may be formed from an aluminum metal material in order to reduce its weight. A bearing holder 12 in a circular shape extends generally vertically about a center of thefixing frame 11. A bearing sleeve 13 that defines a fixed bearing member in a tubular cylindrical form is connected to the bearing holder 12 by a pressure insertion method or a shrink-fit method. The bearing sleeve 13 may be formed from a copper alloy material such as phosphorous bronze in order to facilitate the work to form holes of small diameters. - A stacked
layered stator core 14 in accordance with one embodiment of the present invention is formed from a body of stacked core plates that are formed from electromagnetic steel plates. The stackedlayered stator core 14 is attached to an external peripheral mounting surface of the bearing holder 12. The stackedlayered stator core 14 is formed by stacking in layers a plurality ofcore plates 14 a shown in FIG. 1. As shown in FIG. 1, the stackedlayered stator core 14 has a circularconnection base section 14 a 1 and a plurality ofsalient pole sections 14 a 2 that radially and outwardly protrude from the circularconnection base section 14 a 1. In one aspect, the circularconnection base section 14 a 1 is generally formed in the shape of a ring defining a central bore.Slots 14 a 3 are provided between adjacent ones of thesalient pole sections 14 a 2. - A dielectric film composed of a predetermined dielectric material is formed over the entire surface of the stacked layered
stator core 14 a that is formed from thecore plates 14 a described above. Driving coils 15 (see FIG. 7) are wound around the respectivesalient pole sections 14 a 2 over the dielectric film using theslots 14 a 3. - Furthermore, as shown in the FIG. 7, the bearing sleeve13 has a bearing bore hole formed in a center thereof, and a
rotary shaft 21 that forms therotor assembly 20 is rotatably inserted in the bearing bore hole. A radial dynamic pressure bearing section RB is formed in a gap between a surface of therotary shaft 21 and an internal peripheral surface of the bearing bore hole of the bearing sleeve 13. Also, a plate-shapedthrust plate 23 is fixedly attached to a lower end of therotary shaft 21. Acounter plate 16 is provided at a lower end section of the bearing sleeve 13. Thrust dynamic pressure bearing sections SBa and SBb are formed between thethrust plate 23 and the bearing sleeve 13 and between thethrust plate 23 and thecounter plate 16, respectively. - On the other hand, a
rotor hub 22 forms therotor assembly 20 together with therotor shaft 21. Therotor hub 22 is formed from a generally cup-shaped member composed of an aluminum metal material. - The
rotor hub 22 has acoupling hole 22 d provided at its center. An upper end portion of therotary shaft 21 is coupled to thecoupling hole 22 d by pressure insertion or shrink-fit to connect therotor hub 22 and therotary shaft 21 in one body. Therotor hub 22 has a generallycylindrical body portion 22 a for mounting a recording media disk on its outer peripheral section, and acircular driving magnet 22 c attached through aback yolk 22 b to an internal wall surface in the lower side of thebody section 22 a, as shown in the figure. Thecircular driving magnet 22 c is disposed in proximity to and circularly opposing to an external peripheral side surface of thestator core 14. - The stacked
layered core 14 having the structure described above may be used for a spindle motor for HDDs. The stackedlayered core 14 is formed by successively stacking in layers a plurality ofcore plates 14 a, each having the shape shown in FIG. 1, as described above. - In accordance with one embodiment of the present invention, supporting recessed
sections 14 a 5 are provided at three locations at generally equal intervals on an inner peripheral surface of the circular connection basedsection 14 a 1 of the stacked layeredcore 14. In other words, the supporting recessedsections 14 a 5 are provided on an inner peripheral fixingsurface 14 a 4 of the central hole of the circular connection basedsection 14 a 1 of the stacked layeredcore 14 on the opposite side of thesalient pole sections 14 a 2. The three supporting recessedsections 14 a 5 are formed in a manner to respectively correspond to three protrudedsections 2 b that are provided on a core retaining jig 2 (see FIG. 5 and FIG. 6) that is used in the process of forming a dielectric film. Each of the supporting recessed sections forms a concave groove extending in the axial direction and having a rectangular cross-section in the stacked layered stator core 17 (see FIG. 7) that is formed by stacking in layers thecore plates 14 a. - In particular, as shown in FIG. 2 and FIG. 3, each of the tip sections of the protruded
sections 2 b of thecore retaining jig 2 is inserted in each of thegrooves 14 a 5 formed in the stacked layeredstator core 14. Each of the tip sections of the protrudedsections 2 b of thecore retaining jig 2 abuts to a bottom portion of the groove. In one embodiment, each of the grooves formed by each of the supportinggroove sections 14 a 5 has a groove width w and a groove depth d that can receive each of the protrudedsections 2 b of thecore retaining jig 2. When adielectric film 14 a 6 is coated, abump portion 14 a 7 of thedielectric film 14 a 6 may be formed at the bottom section of the groove that is brought in contact with a tip section of the protrudedsection 2 b of thecore retaining jig 2. When thebump portion 14 a 7 has a height h1, the groove is formed in a manner that the groove depth d is greater than the height h1 (i.e., d>h1). - The tip portion of the protruded
section 2 b of thecore retaining jig 2 may preferably abut to the bottom portion of theconcave groove 14 a 5 in a central area of the bottom portion of theconcave groove 14 a 5. To bring the tip portion of the protrudedsection 2 b of thecore retaining jig 2 in the central area of the bottom portion of theconcave groove 14 a 5, a sloped guide face may preferably be provided in a manner that the groove depth d becomes the maximum at the central area of the bottom portion of the groove. By providing the sloped guide surface in advance, when the stacked layeredstator core 14 is retained by the three protrudedsections 2 b of thecore retaining jig 2, as shown in FIG. 2, each of the protrudedsections 2 b of thecore retaining jig 2 supports the stacked layeredstator core 14 at the central area of the bottom portion of theconcave groove 14 a 5. As a result, various problems that may be caused by the protrudedsection 2 b of thecore retaining jig 2 can be avoided. For example, the protrudedsection 2 b of thecore retaining jig 2 can avoid contact with an inside surface of theconcave groove 14 a 8. - Also, as shown in FIG. 4, the supporting
concave groove 14 a 5 of the present embodiment defining a concave groove is formed in a manner capable of storing a sealingmaterial 14 a 8 to cover portions where thedielectric film 14 a 6 is not formed due to the protrudedsection 2 b of thecore retaining jig 2 contacting the bottom portion of the concave groove. The groove depth d of the supportingconcave groove 14 a 5 is greater than a height h2 of the sealingmaterial 14 a 8 (i.e., d>h2>h1). - When a
dielectric coating film 14 a 6 is formed over the stacked layeredstator core 14 having the supportinggroove section 14 a 5 described above, thecore retaining jig 2 describe above is used to support the entire body of the stacked layeredstator core 14. In one embodiment, the tip end portions of the three protrudedsections 2 b of thecore retaining jig 2 are brought in contact with the bottom portions of the respective three supportingconcave grooves 14 a 5 provided on the inner peripheral fixingsurface 14 a 4 of the circular connection basedsection 14 a 1 of the stack layeredstator core 14. As a result, the entire body of the stacked layeredstator core 14 is supported by thecore retaining jig 2. The shaft sections 2 c of thecore retaining jig 2 that supports the stacked layeredstator core 14 are mounted on a pair of screw conveyors 3 provided in a painting apparatus shown in FIG. 5. As the screw conveyors 3 are rotatably driven, thecore retaining jig 2 is transferred in one direction together with the stack layeredstator core 14 to perform a coat-paining of thedielectric film 14 a 6. - At this moment, the
protruded sections 2 b of thecore retaining jig 2 are in contact with the bottom portions provided inside the supportinggroove sections 14 a 5 of the circular connection basedsection 14 a 1 of the stacked layeredstator core 14. As a result, thebump section 14 a 7 of thedielectric coating film 14 a 6 in the form of a bur, which is formed in the groove section that contacts the protrudedsection 2 b of thecore retaining jig 2, is formed receded inside the supportinggroove section 14 a 5. Therefore, thebump section 14 a 7 does not affect the inner peripheral fixingsurface 14 a 4 of the circularconnection base section 14 a 1 for retaining the stacked layeredstator core 14 or the internal diameter thereof. Also, when thecore retaining jig 2 is removed from the stacked layeredstator core 14, damages that may be caused by the protrudedsection 2 b of thecore retaining jig 2 may only be generated inside the supportinggroove section 14 a 5 of the circular connection basedsection 14 a 1. The damaged portions neither affect the inner peripheral fixingsurface 14 a 4 of the circularconnection base section 14 a 1 or the internal diameter thereof. - Furthermore, in accordance with the embodiment of the present invention, when a sealing
material 14 a 8 for rust prevention is coated over the bottom sections of the grooves that are in contact with the protrudedsections 2 b of thecore retaining jig 2, the sealingmaterial 14 a 8 deposits receded inside the supportingconcave sections 14 a 5. As a result, the sealingmaterial 14 a 8 does not affect the inner peripheral fixingsurface 14 a 4 of the circularconnection base section 14 a 1 or the internal diameter thereof. In addition, when the sealingmaterial 14 a 8 is being coated, the supportingconcave sections 14 a 5 can be used as positional markers for the coating work, and therefore an improved workability is attained. - The embodiment of the present invention made by the inventors is described above. However, the present invention is not limited to the embodiment described above, and many modifications can be made without departing from the subject matter of the present invention.
- For example, in the embodiment described above, the president invention is applied to an inner-rotor type stacked layered core. However, the president invention is likewise applicable to an outer-rotor type stacked layered core that has a circular connection base section in which salient poles protrude inwardly from an inner surface of the circular connection base section. In the case of an inner-rotor type stacked layered core, supporting
groove sections 14 a 5 are provided on an outer peripheral surface of the circular connection base section. - Also, the present invention is not limited to a motor for a hard disk drive (HDD) such as the one described in the above embodiment, but is likewise applicable to a variety of other motors and generators.
- As described above, in the stacked layered core and the method for manufacturing the same in accordance with the present invention described above, the protruded sections of the core retaining jig are brought in contact with the interior of the supporting concave sections provided in the core circular connection base section of the stacked layered core. As a result, bumps of the dielectric coating film that may be generated at locations where the protruded sections of the core retaining jig are in contact with the concave sections do not protrude from the supporting concave sections. Also, damages, which may be caused by the protruded sections of the core retaining jig when the core retaining jig is removed, are generated only inside the supporting concave sections formed in the connection base section of the stacked layered core. Therefore, the bumps of the dielectric coating film and the damaged portions do not affect the diametrical dimensions of the stacked layered core at all when the connection base section of the stacked layer core is affixed to, for example, a bearing holder of a motor, and therefore the productivity of stacked layered cores can be improved.
- Furthermore, the supporting concave sections may be formed in a manner that, when a sealing material for rust prevention is coated over portions that are in contact with the protruded sections of the core retaining jig, the sealing material is formed receded inside the supporting concave sections such that the sealing material does not protrude from the concave sections. As a result, influences on the diametrical dimension of the fixing surface of the stacked layered core by the sealing material can be eliminated. Also, since the dimensional influences do not have to be considered, the coating work in coating the sealing material can be facilitated.
- While the description above refers to particular embodiments of the present invention, it will be understood that many modifications may be made without departing from the spirit thereof. The accompanying claims are intended to cover such modifications as would fall within the true scope and spirit of the present invention.
- The presently disclosed embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims, rather than the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Claims (12)
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JP2000-136699 | 2000-05-10 | ||
JP2000136699A JP2001320842A (en) | 2000-05-10 | 2000-05-10 | Laminated core and method for manufacturing it |
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US20020047461A1 true US20020047461A1 (en) | 2002-04-25 |
US6446324B1 US6446324B1 (en) | 2002-09-10 |
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US09/848,115 Expired - Lifetime US6446324B1 (en) | 2000-05-10 | 2001-05-02 | Stacked layered core and method for manufacturing the same |
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US (1) | US6446324B1 (en) |
JP (1) | JP2001320842A (en) |
Families Citing this family (5)
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JP2002153034A (en) * | 2000-11-07 | 2002-05-24 | Sanshin Ind Co Ltd | Generator in outboard motor |
KR101025976B1 (en) | 2009-06-15 | 2011-03-30 | 삼성전기주식회사 | Coil Winding Jig and Coil Winding Apparatus |
TWI465006B (en) | 2011-12-02 | 2014-12-11 | Ind Tech Res Inst | Stator assembly structure for axial flux electric machine |
JP5764483B2 (en) * | 2011-12-05 | 2015-08-19 | 株式会社三井ハイテック | Manufacturing method of laminated iron core and shape of punched punch generated thereby |
JP2021097488A (en) * | 2019-12-17 | 2021-06-24 | 吉川工業株式会社 | Manufacturing method of laminated iron core and jig used therefor |
Family Cites Families (16)
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US2711008A (en) * | 1950-10-26 | 1955-06-21 | Beresford James & Son Ltd | Manufacture of stators for electric motors |
US4149309A (en) * | 1977-07-27 | 1979-04-17 | Mitsui Mfg. Co., Ltd. | Laminated core manufacture |
JPS5437802U (en) * | 1977-08-22 | 1979-03-12 | ||
JP2888142B2 (en) * | 1993-11-08 | 1999-05-10 | 三菱電機株式会社 | Rotary motor and method of manufacturing the same |
JP3134304B2 (en) * | 1990-10-31 | 2001-02-13 | 日本電産株式会社 | motor |
JPH05103449A (en) * | 1991-10-04 | 1993-04-23 | Asmo Co Ltd | Manufacture of laminated core for dynamoelectric machine |
JPH06169556A (en) * | 1992-11-30 | 1994-06-14 | Matsushita Electric Ind Co Ltd | Manufacture of stator of electric motor and stator core thereof |
US5852338A (en) * | 1997-02-03 | 1998-12-22 | General Electric Company | Dynamoelectric machine and method for manufacturing same |
JP3568364B2 (en) * | 1996-09-30 | 2004-09-22 | 松下電器産業株式会社 | Rotating machine core |
JP3434426B2 (en) * | 1996-11-05 | 2003-08-11 | 株式会社田中製作所 | Motor core, motor provided with the motor core and jig for coating the core |
JPH10215533A (en) * | 1997-01-28 | 1998-08-11 | Sankyo Seiki Mfg Co Ltd | Laminated core and production thereof |
JP3855111B2 (en) * | 1997-02-19 | 2006-12-06 | 株式会社ダイドー電子 | Electrodeposition coating method of magnet material |
CN1143424C (en) * | 1997-03-06 | 2004-03-24 | 株式会社电装 | Method for production of rotor inserted with coil-bar and slot type insulator assembly and apparatus therefor |
JPH10285881A (en) * | 1997-03-28 | 1998-10-23 | Nippon Densan Corp | Magnet in permanent magnet motor and its formation method |
JPH10322944A (en) * | 1997-05-19 | 1998-12-04 | Minebea Co Ltd | Motor structure and its manufacture |
US6225725B1 (en) * | 1999-02-08 | 2001-05-01 | Itoh Electric Co. Ltd. | Manufacturing process of a divided type stator |
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2000
- 2000-05-10 JP JP2000136699A patent/JP2001320842A/en active Pending
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2001
- 2001-05-02 US US09/848,115 patent/US6446324B1/en not_active Expired - Lifetime
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JP2001320842A (en) | 2001-11-16 |
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