WO2023135730A1 - 回転電機 - Google Patents
回転電機 Download PDFInfo
- Publication number
- WO2023135730A1 WO2023135730A1 PCT/JP2022/001071 JP2022001071W WO2023135730A1 WO 2023135730 A1 WO2023135730 A1 WO 2023135730A1 JP 2022001071 W JP2022001071 W JP 2022001071W WO 2023135730 A1 WO2023135730 A1 WO 2023135730A1
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- WO
- WIPO (PCT)
- Prior art keywords
- electromagnetic steel
- steel sheet
- movable
- steel plate
- projection
- Prior art date
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- 229910000831 Steel Inorganic materials 0.000 claims abstract description 313
- 239000010959 steel Substances 0.000 claims abstract description 313
- 229910000576 Laminated steel Inorganic materials 0.000 claims abstract description 12
- 230000002093 peripheral effect Effects 0.000 claims description 65
- 238000006073 displacement reaction Methods 0.000 claims description 4
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- 238000000034 method Methods 0.000 description 12
- 230000004048 modification Effects 0.000 description 12
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- 238000004804 winding Methods 0.000 description 11
- 239000012212 insulator Substances 0.000 description 8
- 238000009826 distribution Methods 0.000 description 5
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- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910000976 Electrical steel Inorganic materials 0.000 description 1
- 241001272720 Medialuna californiensis Species 0.000 description 1
- 239000003522 acrylic cement Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
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- 238000011900 installation process Methods 0.000 description 1
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Images
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
- H02K1/2706—Inner rotors
- H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
- H02K1/274—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
- H02K1/2753—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets the rotor consisting of magnets or groups of magnets arranged with alternating polarity
- H02K1/278—Surface mounted magnets; Inset magnets
- H02K1/2781—Magnets shaped to vary the mechanical air gap between the magnets and the stator
-
- 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
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K16/00—Machines with more than one rotor or stator
-
- 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/64—Electric machine technologies in electromobility
Definitions
- the present disclosure relates to rotating electric machines.
- Patent Literature 1 discloses a structure in which a magnet is pushed between a fixed positioning projection and a movable positioning projection, and the magnet is fixed with an adhesive.
- the present disclosure has been made to solve the above problems, and aims to provide a rotating electric machine that improves drive efficiency.
- a rotating electric machine includes a stator and a rotor.
- the rotor includes a rotating shaft, a plurality of magnetic steel plates fixed to the rotating shaft, laminated steel plates having an outer peripheral portion, and a plurality of second magnetic steel plates alternately arranged on the outer peripheral portion in the circumferential direction. It has one magnet and a plurality of second magnets.
- the rotor is spaced from and surrounded by the stator.
- the laminated steel plate includes a first magnetic steel plate that fixes the plurality of first magnets, and a second magnetic steel plate that fixes the plurality of second magnets.
- the first magnetic steel plate includes a first fixed positioning protrusion that positions one end of the first magnet in the circumferential direction and protrudes outward from the first magnetic steel plate, and the first magnet in the circumferential direction. and a first movable projection that presses its end toward the first fixed positioning projection and protrudes outward from the first electromagnetic steel plate.
- the second magnetic steel plate includes a second fixed positioning protrusion that positions one end of the second magnet in the circumferential direction and protrudes outward from the second magnetic steel plate, and the second magnet in the circumferential direction. and a second movable projection that presses its end toward the second fixed positioning projection and protrudes outward from the second electromagnetic steel plate.
- FIG. 1 is a cross-sectional view showing a rotating electric machine according to Embodiment 1;
- FIG. 1 is a perspective view showing a rotor unit according to Embodiment 1;
- FIG. 2 is a perspective view showing a rotor core according to Embodiment 1;
- FIG. 2 is a top view showing the rotor core according to Embodiment 1;
- FIG. 2 is a front view showing a rotor core according to Embodiment 1;
- FIG. 2 is a partially exploded view showing a rotor core according to Embodiment 1;
- FIG. FIG. 2 is a top view showing the non-projection electrical steel sheet according to Embodiment 1;
- 4 is a top view showing the first electromagnetic steel sheet according to Embodiment 1;
- FIG. 4 is a top view showing a second electromagnetic steel sheet according to Embodiment 1;
- FIG. 9 is a view showing the first electromagnetic steel sheet according to Embodiment 1, and is an enlarged view showing a portion indicated by symbol A in FIG. 8.
- FIG. FIG. 10 is a view showing the second electromagnetic steel sheet according to Embodiment 1, and is an enlarged view showing a portion indicated by reference symbol B in FIG. 9.
- FIG. 4 is a top view showing a magnet according to Embodiment 1;
- FIG. 4 is a perspective view showing the rotor core after the magnets according to Embodiment 1 are attached;
- FIG. FIG. 5 is a front view showing a rotor core according to Modification 1 of Embodiment 1;
- FIG. 8 is a top view showing a rotor core according to Modification 2 of Embodiment 1;
- FIG. 8 is a perspective view showing a rotor core according to Embodiment 2;
- FIG. 8 is a top view showing a rotor core according to Embodiment 2;
- FIG. 8 is a front view showing a rotor core according to Embodiment 2;
- FIG. 6 is a partially exploded view showing a rotor core according to Embodiment 2;
- FIG. 17 is a view showing a rotor core according to Embodiment 2, and is an enlarged view showing a portion indicated by symbol C in FIG. 16.
- FIG. FIG. 11 is a top view showing a third electromagnetic steel sheet according to Embodiment 2;
- FIG. 11 is a top view showing a third electromagnetic steel sheet according to Embodiment 2;
- FIG. 11 is a top view showing a fourth electromagnetic steel sheet according to Embodiment 2;
- FIG. 11 is a perspective view showing a first electromagnetic steel sheet according to a modification of Embodiment 2;
- FIG. 11 is a perspective view showing a rotor unit according to Embodiment 3, showing a state before magnets are fixed to the rotor unit;
- FIG. 11 is a perspective view showing a rotor unit according to Embodiment 3;
- FIGS. 1 to 24 A rotating electrical machine according to an embodiment will be described with reference to FIGS. 1 to 24.
- FIG. 1 to 24 identical or similar components are denoted by the same reference numerals.
- the drawings schematically or conceptually illustrate embodiments. The relationship between the thickness and width of each portion shown in the drawings, the size ratio between portions, and the like are not necessarily the same as those of the actual members. Illustrations of configurations unrelated to features of the present disclosure may be omitted.
- the rotating electric machine according to Embodiment 1 is applied to an electric power steering device mounted on a vehicle.
- a power steering system includes a control device that controls a rotating electrical machine.
- the control device assists the steering force of the steering of the vehicle. 1 to 24, the illustration of such a control device may be omitted.
- the X direction, Y direction, and Z direction corresponding to a three-dimensional orthogonal coordinate system are shown (symbols X, Y, Z).
- the Z direction coincides with the axial direction of the rotating electric machine.
- the X and Y directions intersect (eg, are orthogonal to) the Z direction.
- the X-direction and the Y-direction intersect (eg, are orthogonal to) each other.
- directions intersecting with the X direction and the Y direction may be shown.
- a direction crossing the X direction is called a first crossing direction CR.
- a direction crossing the Y direction is called a second crossing direction CS.
- the angle between the first cross direction CR and the X direction is, for example, 45 degrees.
- the angle between the second cross direction CS and the Y direction is, for example, 45 degrees.
- the first crossing direction CR and the second crossing direction CS intersect (for example, orthogonally cross) each other.
- circumferential direction means a direction outward from the center of the stator in the radial direction.
- radially inward means a direction from the outside toward the center of the stator in the radial direction.
- Front side and rear side are sometimes used to describe the configuration of the rotating electric machine.
- the front side means a position where a member for mounting the rotating electric machine to the vehicle is arranged.
- the rear side is the opposite side to the front side.
- a control device is arranged on the rear side.
- ZF Z direction
- Reference ZR Z direction
- FIG. 1 is a cross-sectional view showing a rotating electric machine 1.
- the rotating electric machine 1 includes a frame 2, a stator 3, an insulator 4, a stator winding 5, a terminal 6, a bearing 7, a bearing holder 8, a bearing 9, a rotor unit 14, and a joint 15. and a heat sink 16 .
- the rotary electric machine 1 is connected to a sensor 17 that detects the driving state of the rotary electric machine 1 and a control device 18 that controls the driving of the rotary electric machine 1 .
- the frame 2 is a housing that configures the rotary electric machine 1 .
- a material forming the frame 2 is, for example, an inexpensive and lightweight aluminum alloy.
- the frame 2 has a frame main body 2M and a base 2D.
- the frame main body 2M has an opening 2A and an inner wall surface 2B.
- the opening 2A is a portion located on the rear side of the frame 2. As shown in FIG.
- the area where the inner wall surface 2B is exposed, that is, the space inside the frame main body 2M is an inner area 2C in which a plurality of members forming the rotating electric machine 1 are arranged.
- the shape of the frame main body 2M is substantially cylindrical.
- a substantially cylindrical shape means the overall shape of the frame body 2M, and does not necessarily mean only a geometrically defined cylinder.
- a substantially cylindrical shape means a cylindrical shape with chamfered corners, a shape including manufacturing errors, and a cylindrical shape that partially includes protrusions, recesses, steps, and the like.
- the pedestal 2D is a part provided on the front side of the frame 2.
- a screw hole is formed in the base 2D.
- a known fastening member such as a screw is inserted into the screw hole.
- the rotary electric machine 1 is fixed to the power steering device via a base 2D.
- a stator 3 is arranged in the inner region 2 ⁇ /b>C and fixed to the frame 2 .
- the stator 3 has a plurality of electromagnetic steel plates.
- a plurality of electromagnetic steel sheets are laminated in the axial direction, for example.
- the stator 3 has a stator outer surface 3A.
- the stator 3 has a stator inner surface 3B.
- the stator 3 has a stator top surface 3C and a stator bottom surface 3D.
- the stator lower surface 3D is a surface located on the opposite side to the stator upper surface 3C.
- the stator 3 can also be called a stator core, for example.
- the stator outer side surface 3A faces the inner wall surface 2B of the frame 2 while the stator 3 is arranged in the inner region 2C.
- the stator outer surface 3A and the inner wall surface 2B are in direct contact.
- a fixing member for fixing the stator 3 to the inner region 2C may be arranged between the stator outer side surface 3A and the inner wall surface 2B.
- the stator inner surface 3B faces the rotor unit 14 while the stator 3 is arranged in the inner region 2C.
- the insulator 4 is made of a known insulating material such as a resin material.
- the insulator 4 is arranged on the stator 3 so as to cover part of the stator top surface 3C and part of the stator bottom surface 3D.
- the insulator 4 is arranged between the stator 3 and the stator windings 5 .
- the insulator 4 electrically insulates the stator windings 5 and the stator 3 .
- the stator winding 5 is known wiring, for example, copper wire coated with an insulating film such as resin.
- a stator winding 5 is wound around the stator 3 so that an insulator 4 is interposed between the stator 3 and the stator winding 5 .
- Terminal 6 is made of a known conductive metal material. Terminal 6 is electrically connected to stator winding 5 . The terminal 6 is electrically connected to a control device 18 arranged outside the rotating electric machine 1 . Terminal 6 supplies power output from controller 18 to stator winding 5 .
- the bearings 7 and 9 are, for example, known ball bearings or roller bearings.
- the bearing holder 8 is arranged on the rear side of the frame 2 . In other words, it is positioned at the opening 2A of the frame 2. FIG.
- the bearing 7 is arranged on the front side of the frame 2 . In other words, the bearing 7 is arranged at the radially inner position of the base 2 ⁇ /b>D of the frame 2 , that is, in the axial direction.
- the bearing 9 is arranged on the rear side of the frame 2 . In other words, the bearing 9 is arranged at a radially inner position in the bearing holder 8, that is, axially.
- FIG. 2 is a perspective view showing the rotor unit 14.
- the rotor unit 14 is an example of a rotor.
- the rotor unit 14 has a rotating shaft 10 , a rotor core 11 , a plurality of magnets 12 and a protective tube 13 .
- the rotor unit 14 is separated from the stator 3 and arranged so as to be surrounded by the stator 3 .
- the rotating shaft 10 is made of, for example, a known metal material.
- a front side of the rotating shaft 10 is rotatably supported by a bearing 7 .
- a rear side of the rotating shaft 10 is rotatably supported by a bearing 9 .
- the rotating shaft 10 has a central region 10A located between the front side and the rear side.
- the rotating shaft 10 On the front side of the rotating shaft 10 , the rotating shaft 10 has an end portion 10 ⁇ /b>B located outside the bearing 7 .
- On the rear side of the rotating shaft 10 has an end portion 10 ⁇ /b>C located outside the bearing 9 .
- the rotor core 11 has a plurality of electromagnetic steel plates.
- the electromagnetic steel sheet is made of a known metal material.
- a plurality of electromagnetic steel sheets forming the rotor core 11 are laminated in the axial direction, for example.
- Rotor core 11 is fixed to central region 10A of rotating shaft 10 .
- the rotor core 11 has an outer peripheral portion 11A positioned radially outward.
- Each of the plurality of magnets 12 is made of a known magnetic material.
- a plurality of magnets 12 are adhered to the outer peripheral portion 11A of the rotor core 11 . That is, the plurality of magnets 12 are fixed to the outer peripheral portion 11A of the rotor core 11. As shown in FIG.
- the protective tube 13 is made of a known non-magnetic material such as stainless steel or aluminum.
- the protective tube 13 covers the radially outer portion of the rotor unit 14 including the plurality of magnets 12 .
- Protective tube 13 is provided outside magnet 12 fixed to rotor core 11 .
- the protection tube 13 is formed by deep drawing, for example.
- the protection tube 13 is a member for preventing rotation of the rotor unit 14 from stopping when the magnet 12 is cracked or detached from the rotor unit 14 .
- the protective tube 13 is attached to the rotor unit 14 .
- the rotor unit 14 does not have to be provided with the protective tube 13 , in the first embodiment, the rotor unit 14 is provided with the protective tube 13 .
- the joint 15 is installed at the end portion 10B of the rotating shaft 10 .
- the joint 15 is a member that assembles the end portion 10B of the rotating shaft 10 and the rotating shaft of the vehicle.
- the joint 15 is made of, for example, a known strong metallic material.
- the heat sink 16 is arranged on the rear side of the frame 2 . In other words, the heat sink 16 is arranged at the open end located outside the bearing holder 8 in the opening 2A of the frame 2 .
- the heat sink 16 is made of a known metallic material with excellent thermal conductivity.
- a control device (not shown) is installed in the heat sink 16 .
- a sensor 17 is installed at the end portion 10C of the rotating shaft 10 .
- a sensor 17 detects the rotation state of the rotor core 11 .
- the sensor 17 is, for example, a known rotation angle detection sensor.
- Controller 18 includes power conversion circuitry and control circuitry.
- the power conversion circuit is, for example, a power conversion circuit with power semiconductors.
- the power conversion circuit converts a direct current supplied from the outside of the control device 18 into an alternating current.
- Controller 18 controls the amount of current supplied to stator winding 5 via terminal 6 .
- rotational force is generated in the rotor core 11 according to the amount of electric power supplied to the rotating electrical machine 1 .
- the joint 15 rotates and the rotating shaft of the vehicle rotates.
- FIG. 3 is a perspective view showing the rotor core 11.
- FIG. 4 is a top view showing the rotor core 11.
- FIG. 5 is a front view showing the rotor core 11.
- FIG. 6 is a partially exploded view showing the rotor core 11.
- FIG. 7 is a top view showing the non-projecting magnetic steel sheet 110.
- FIG. 8 is a top view showing the first electromagnetic steel sheet 111.
- FIG. 9 is a top view showing the second electromagnetic steel sheet 112. As shown in FIG. FIG.
- FIG. 10 is a diagram showing the first electromagnetic steel sheet 111, and is an enlarged view showing the portion indicated by symbol A in FIG.
- FIG. 11 is a diagram showing the second electromagnetic steel sheet 112, and is an enlarged view showing the portion indicated by the symbol B in FIG.
- FIG. 12 is a top view showing the magnet 12.
- FIG. FIG. 13 is a perspective view showing a state after the magnets 12 are attached to the rotor core 11.
- the rotor unit 14 is composed of a plurality of electromagnetic steel plates fixed to the rotating shaft 10.
- the rotor unit 14 has laminated steel plates with an outer peripheral portion 11A.
- the rotor unit 14 has a plurality of magnets 12 arranged in the circumferential direction on the outer peripheral portion 11A.
- the rotor unit 14 is separated from the stator 3 and surrounded by the stator 3 .
- the rotor core 11 is an example of a laminated steel plate in which a plurality of electromagnetic steel plates are laminated in the Z direction.
- the outer shape of the rotor core 11 is, for example, a substantially regular octagonal prism shape.
- the substantially regular octagonal prism shape means the overall shape of the rotor core 11, and does not necessarily mean only a geometrically defined regular octagonal prism.
- a substantially regular octagonal prism is a regular octagonal prism with chamfered corners, a shape that includes manufacturing errors, a convex part that protrudes radially outward, a concave part that is recessed radially inward, and a regular octagonal prism shape that partially includes steps.
- the rotor core 11 has eight outer peripheral surfaces 11a at radially outer positions. Each of the eight outer peripheral surfaces 11a is a region in which the magnets 12 are arranged.
- the eight outer peripheral surfaces 11a arranged clockwise in the circumferential direction are arranged in order of a first placement region R1, a second placement region R2, a third placement region R3, a fourth placement region R4, a fifth placement region R5, and a sixth placement region R5. They may be referred to as region R6, seventh placement region R7, and eighth placement region R8.
- the outer peripheral surface 11a corresponds to the outer peripheral portion 11A.
- the rotor core 11 has one first through hole 11b at the radially inner position.
- the first through hole 11 b is provided in the center of the rotor core 11 .
- the first through hole 11b is a portion into which the rotating shaft 10 is inserted.
- the first through hole 11b has an engaging recess 11c.
- the engaging recess 11 c is a portion where the rotor core 11 and the central region 10 A of the rotating shaft 10 are engaged when the rotating shaft 10 is inserted into the rotor core 11 .
- the rotor core 11 has a plurality of second through holes 11d formed between the outer peripheral surface 11a and the first through holes 11b.
- the plurality of second through holes 11d are formed at regular intervals in the circumferential direction.
- the number of multiple second through holes 11d is five.
- the number of second through holes 11d is not limited to five.
- the number of second through-holes 11d can be appropriately changed according to the design of the rotating electrical machine 1, such as the strength and weight of the rotor core 11, the driving force generated by the rotating electrical machine 1, and the like.
- the number N of the plurality of electromagnetic steel sheets forming the rotor core 11 is 47 sheets.
- the number N of electromagnetic steel sheets is not limited to 47.
- the number N of electromagnetic steel sheets can be appropriately changed according to the design of the rotating electrical machine 1, such as the size and weight of the rotor core 11 in the Z direction, the driving force generated by the rotating electrical machine 1, and the like.
- the electromagnetic steel sheet arranged closest to the front side among the plurality of electromagnetic steel sheets may be referred to as the first electromagnetic steel sheet N1.
- the electromagnetic steel sheet arranged closest to the rear side among the plurality of electromagnetic steel sheets may be referred to as the 47th electromagnetic steel sheet N47.
- the electromagnetic steel sheets arranged between the first electromagnetic steel sheet N1 and the 47th electromagnetic steel sheet N47 are arranged in order, the second electromagnetic steel sheet N2, and the third electromagnetic steel sheet N2.
- the laminated steel plates of the rotor unit 14 are composed of the first magnetic steel plate N1 to the 47th magnetic steel plate N47.
- Rotor core 11 has non-projecting magnetic steel sheets 110 , first magnetic steel sheets 111 , and second magnetic steel sheets 112 .
- the shape of the non-projection magnetic steel plate 110, the first magnetic steel plate 111, and the second magnetic steel plate 112 is substantially a regular octagon when viewed in the Z direction.
- a substantially regular octagon does not necessarily mean only a geometrically defined regular octagon.
- a substantially regular octagon is a substantially regular octagon that partially includes a shape with chamfered corners, a shape that includes manufacturing errors, a convex part that protrudes radially outward, a concave part that is recessed radially inward, and a step. means square.
- Each of the plurality of electromagnetic steel sheets has an outer peripheral surface 11a, a first through hole 11b, an engaging recess 11c, and a plurality of second through holes 11d, similar to the configuration of the rotor core 11. For this reason, in the following description, description of the above-described portions of the rotor core 11 may be omitted.
- Non-projection electromagnetic steel sheet 110 As shown in FIG. 5, the first magnetic steel sheet N1, the second magnetic steel sheet N2, the fifth magnetic steel sheet N5 to the 43rd magnetic steel sheet N43, the 46th magnetic steel sheet N46, and the 47th magnetic steel sheet N46
- the second magnetic steel plate N47 is the non-protruding magnetic steel plate 110 .
- the non-projection electromagnetic steel sheet 110 is an electromagnetic steel sheet that is different from the first electromagnetic steel sheet 111 and the second electromagnetic steel sheet 112 and has no projections.
- Non-projecting magnetic steel sheet 110 has eight outer peripheral corner portions 110C and eight straight portions 110L.
- the non-projecting magnetic steel sheet 110 has eight concave portions 110a provided in one-to-one correspondence with the eight outer peripheral corner portions 110C.
- the recesses 110a are located at the corners of the regular octagon.
- the shape of the recess 110a is, for example, semicircular.
- the semi-circular shape is not limited to the shape shown in FIG.
- the depth of the recessed portion 110a that is recessed radially inward can be adjusted.
- the shape of the recess 110a is not limited to a semicircular shape with curvature.
- the recessed portion 110a may have a corner portion, or may have a linear portion extending straight.
- As the shape of the concave portion 110a a shape in which at least two of curved surface portions, corner portions, and linear portions are combined may be employed.
- the shape of the recess 110a may be substantially U-shaped, for example.
- the non-projecting magnetic steel sheet 110 is one of the plurality of magnetic steel sheets forming the rotor core 11 . Therefore, the non-projecting magnetic steel sheet 110 includes a first arrangement region R1, a second arrangement region R2, a third arrangement region R3, a fourth arrangement region R4, a fifth arrangement region R5, a sixth arrangement region R6, and a seventh arrangement region. R7, and an eighth placement region R8.
- the fourth electromagnetic steel sheet N4 and the 44th electromagnetic steel sheet N44 are the first electromagnetic steel sheets 111 .
- the first electromagnetic steel sheets 111 are arranged in the rear region 11R and the front region 11F of the rotor core 11 in the axial direction.
- the rear region 11R is an example of a first region.
- the front area 11F is an example of a second area.
- the first electromagnetic steel sheet 111 has eight outer peripheral corner portions 111C and eight straight portions 111L.
- the first electromagnetic steel plate 111 includes fixed positioning protrusions 111a provided in one-to-one correspondence with four of the eight outer peripheral corner portions 111C, and one-to-one positioning protrusions 111a at the remaining four outer peripheral corner portions 111C. and movable protrusions 111b provided to correspond in pairs. That is, the first electromagnetic steel plate 111 integrally includes four fixed positioning protrusions 111a and four movable protrusions 111b.
- the first electromagnetic steel sheet 111 is an electromagnetic steel sheet that fixes the first magnet 12 , which is one of the plurality of magnets 12 . In the following description, the first magnet 12 is simply called magnet 12 .
- the first electromagnetic steel plate 111 has a first fixed positioning projection 111a and a first movable projection 111b.
- the first fixed positioning projection 111a positions one end of the first magnet 12 in the circumferential direction and protrudes outward from the first electromagnetic steel plate 111 .
- the first movable protrusion 111b presses the other end of the first magnet 12 in the circumferential direction toward the first fixed positioning protrusion 111a and protrudes outward from the first electromagnetic steel plate 111 .
- the first fixed positioning protrusion 111a is simply referred to as fixed positioning protrusion 111a
- the first movable protrusion 111b is simply referred to as movable protrusion 111b.
- the four fixed positioning projections 111a are provided on the first electromagnetic steel plate 111 at a pitch of 90 degrees in the circumferential direction.
- Two fixed positioning projections 111a provided on opposite sides in the radial direction constitute a set of fixed positioning projections. That is, the first electromagnetic steel sheet 111 has two sets of fixed positioning protrusions.
- the four movable projections 111b are provided on the first electromagnetic steel plate 111 at a pitch of 90 degrees in the circumferential direction.
- Two movable projections 111b provided on opposite sides in the radial direction constitute a set of movable projections. That is, the first electromagnetic steel sheet 111 has two pairs of movable projections.
- the first electromagnetic steel sheet 111 is one of the multiple electromagnetic steel sheets forming the rotor core 11 . Therefore, the first electromagnetic steel sheet 111 includes a first arrangement region R1, a second arrangement region R2, a third arrangement region R3, a fourth arrangement region R4, a fifth arrangement region R5, a sixth arrangement region R6, and a seventh arrangement region. R7, and an eighth placement region R8.
- the movable protrusion 111b extends in the Y direction.
- the first electromagnetic steel sheet 111 has two concave portions 111p and 111q provided on both sides of the movable protrusion 111b in the X direction.
- the concave portion provided between the movable protrusion 111b and the linear portion 111L extending in the X direction is the first movable orthogonal concave portion 111q.
- the concave portion provided between the movable protrusion 111b and the straight portion 111L extending in the first cross direction CR is the first movable oblique concave portion 111p.
- Each of the first movable orthogonal concave portion 111q and the first movable oblique concave portion 111p is a notch formed in the first electromagnetic steel plate 111 extending parallel to the Y direction.
- the first movable orthogonal recess 111q has a bottom portion 111s positioned at the end of the first movable orthogonal recess 111q.
- the first movable diagonal recess 111p has a bottom portion 111r positioned at the end of the first movable diagonal recess 111p.
- the movable protrusion 111b has an introductory tapered portion 111c provided on the tip side of the movable protrusion 111b.
- the introductory tapered portion 111c faces the fixed positioning protrusion 111a.
- the introductory tapered portion 111c is a protrusion that protrudes from the tip of the movable protrusion 111b toward the fixed positioning protrusion 111a in the X direction.
- the distance between the top and bottom portions 111r of the leading tapered portion 111c in the Y direction is the free end length L1.
- the free end length L1 is set in consideration of the amount or range of movement in the circumferential direction when the movable projection 111b is elastically deformed and the elastic restoring force of the movable projection 111b.
- the movable projection 111b has a movable extension surface 111bx facing the first movable oblique concave portion 111p.
- the distance between the top of the introductory tapered portion 111c and the movable extension surface 111bx is the width W1 of the movable protrusion 111b.
- the width W1 is set in consideration of workability of the movable protrusion 111b.
- the width W1 is set so that the space between the magnet 12 adjacent to the movable projection 111b and the movable projection 111b does not become large. In Embodiment 1, the width W1 is the same as the width W2 of the fixed positioning projection 111a.
- the fixed positioning protrusion 111a extends in the Y direction.
- the first electromagnetic steel plate 111 has one first fixed extension concave portion 111t provided next to the fixed positioning protrusion 111a in the X direction.
- the first fixed extension concave portion 111t is provided between the fixed positioning protrusion 111a and the straight portion 111L extending in the X direction.
- the first fixed extension concave portion 111t is a notch portion formed in the first electromagnetic steel plate 111 extending parallel to the Y direction.
- the first fixed extended recess 111t has a bottom portion 111u located at the end of the first fixed extended recess 111t.
- the fixed positioning protrusion 111a has a tip portion 111af, an inclined end portion 111as, an inclined portion 111ak, and a fixed extension surface 111at.
- the distal end portion 111af is the distal end located on the outermost side of the fixed positioning projection 111a in the Y direction.
- the inclined portion 111ak is a surface extending from the tip portion 111af to the inclined end portion 111as in a direction inclined with respect to the Y direction.
- the fixed extension surface 111at is a surface located on the opposite side of the fixed positioning projection 111a from the position where the first fixed extension concave portion 111t is formed.
- One end of the inclined portion 111ak is the tip portion 111af, and the other end of the inclined portion 111ak is the inclined end portion 111as.
- the inclined portion 111ak is formed between the tip portion 111af and the inclined end portion 111as.
- An inclined end portion 111as is formed between the inclined portion 111ak and the fixed extension surface 111at.
- the distance between the inclined end portion 111as and the bottom portion 111u in the Y direction is the free end length L2.
- the free end length L2 of the fixed positioning projection 111a is shorter than the free end length L1 of the movable projection 111b. Therefore, even if a force from the outside of the first electromagnetic steel plate 111 is applied to the fixed positioning protrusion 111a, the fixed positioning protrusion 111a hardly deforms. In other words, since the free end length L1 is longer than the free end length L2, the amount of elastic deformation in the circumferential direction of the movable projection 111b is greater than that of the fixed positioning projection 111a.
- the width of the fixed positioning protrusion 111a in the X direction is the width W2.
- the width W2 of the fixed positioning projection 111a is the same as the width W1 of the movable projection 111b.
- the structure of the movable protrusion 111b and the fixed positioning protrusion 111a shown in FIG. 10 is applied to the first placement region R1, the third placement region R3, the fifth placement region R5, and the seventh placement region R7.
- the third electromagnetic steel sheet N3 and the 45th electromagnetic steel sheet N45 are the second electromagnetic steel sheets 112 .
- the second electromagnetic steel sheets 112 are arranged in the rear region 11R and the front region 11F of the rotor core 11 in the axial direction.
- second electromagnetic steel sheet 112 has eight outer peripheral corner portions 112C and eight straight portions 112L.
- the second electromagnetic steel plate 112 includes fixed positioning protrusions 112a provided in one-to-one correspondence with four outer peripheral corner portions 112C of the eight outer peripheral corner portions 112C. It has a movable projection 112b provided so as to correspond in a pair.
- the second electromagnetic steel plate 112 integrally includes four fixed positioning projections 112a and four movable projections 112b.
- the second electromagnetic steel sheet 112 is an electromagnetic steel sheet that is adjacent to the first magnet 12 in the circumferential direction and fixes the second magnet 12 , which is one of the plurality of magnets 12 .
- the second magnet 12 will simply be referred to as magnet 12 .
- the second electromagnetic steel plate 112 has a second fixed positioning projection 112a and a second movable projection 112b.
- the second fixed positioning projection 112a positions one end of the second magnet 12 in the circumferential direction and protrudes outward from the second electromagnetic steel plate 112 .
- the second movable protrusion 112b presses the other end of the second magnet 12 in the circumferential direction toward the second fixed positioning protrusion 112a and protrudes outward from the second electromagnetic steel plate 112 .
- the second fixed positioning protrusion 112a is simply referred to as fixed positioning protrusion 112a
- the second movable protrusion 112b is simply referred to as movable protrusion 112b.
- the four fixed positioning protrusions 112a are provided on the second electromagnetic steel plate 112 at a pitch of 90 degrees in the circumferential direction.
- Two fixed positioning projections 112a provided on opposite sides in the radial direction constitute a set of fixed positioning projections. That is, the second electromagnetic steel plate 112 has two sets of fixed positioning protrusions.
- the four movable projections 112b are provided on the second electromagnetic steel plate 112 at a pitch of 90 degrees in the circumferential direction.
- Two movable projections 112b provided on opposite sides in the radial direction constitute a set of movable projections. That is, the second electromagnetic steel sheet 112 has two pairs of movable projections.
- the second electromagnetic steel sheet 112 is one of the multiple electromagnetic steel sheets forming the rotor core 11 . Therefore, the second electromagnetic steel sheet 112 includes a first arrangement region R1, a second arrangement region R2, a third arrangement region R3, a fourth arrangement region R4, a fifth arrangement region R5, a sixth arrangement region R6, and a seventh arrangement region. R7, and an eighth placement region R8.
- the movable protrusion 112b extends in the first cross direction CR.
- the second electromagnetic steel sheet 112 has two recesses 112p and 112q provided on both sides of the movable protrusion 112b in the second cross direction CS.
- the concave portion provided between the movable protrusion 112b and the straight portion 112L extending in the second cross direction CS is the second movable orthogonal concave portion 112q.
- the concave portion provided between the movable protrusion 112b and the linear portion 112L extending in the X direction is the second movable oblique concave portion 112p.
- Each of the second movable orthogonal concave portion 112q and the second movable oblique concave portion 112p is a notch formed in the second electromagnetic steel plate 112 extending parallel to the first cross direction CR.
- the second movable orthogonal recess 112q has a bottom portion 112s positioned at the end of the second movable orthogonal recess 112q.
- the second movable diagonal recess 112p has a bottom portion 112r located at the end of the second movable diagonal recess 112p.
- the movable projection 112b has an introductory tapered portion 112c provided on the tip side of the movable projection 112b.
- the lead-in tapered portion 112c faces the fixed positioning protrusion 112a.
- the introductory tapered portion 112c is a protruding portion that protrudes from the distal end portion of the movable protrusion 112b toward the fixed positioning protrusion 112a in the second cross direction CS.
- the distance between the top portion and the bottom portion 112r of the lead-in tapered portion 112c in the first cross direction CR is the free end length L1.
- the free end length L1 is set in consideration of the amount or range of movement in the circumferential direction when the movable projection 112b is elastically deformed, and the elastic restoring force of the movable projection 112b.
- the movable protrusion 112b has a movable extension surface 112bx facing the second movable oblique recess 112p.
- the distance between the top of the introductory tapered portion 112c and the movable extension surface 112bx is the width W1 of the movable protrusion 112b.
- the width W1 is set in consideration of workability of the movable protrusion 112b.
- the width W1 is set so that the space between the magnet 12 adjacent to the movable protrusion 112b and the movable protrusion 112b does not become large. In Embodiment 1, width W1 is the same as width W2 of fixed positioning projection 112a.
- the fixed positioning protrusion 112a extends in the first cross direction CR.
- the second electromagnetic steel plate 112 has one second fixed extended recess 112t provided next to the fixed positioning protrusion 112a in the second cross direction CS.
- the second fixed extension concave portion 112t is provided between the fixed positioning protrusion 112a and the straight portion 112L extending in the second cross direction CS.
- the second fixed extension recess 112t is a notch formed in the second electromagnetic steel plate 112 extending parallel to the first cross direction CR.
- the second fixed extended recess 112t has a bottom portion 112u positioned at the end of the second fixed extended recess 112t.
- the fixed positioning projection 112a has a tip portion 112af, an inclined end portion 112as, an inclined portion 112ak, and a fixed extension surface 112at.
- the distal end portion 112af is the distal end located on the outermost side of the fixed positioning protrusion 112a in the first cross direction CR.
- the inclined portion 112ak is a surface extending from the tip portion 112af to the inclined end portion 112as in a direction inclined with respect to the first cross direction CR.
- the fixed extension surface 112at is a surface located on the opposite side of the fixed positioning projection 112a from the position where the second fixed extension recess 112t is formed.
- One end of the inclined portion 112ak is the tip portion 112af, and the other end of the inclined portion 112ak is the inclined end portion 112as.
- the inclined portion 112ak is formed between the tip portion 112af and the inclined end portion 112as.
- An inclined end portion 112as is formed between the inclined portion 112ak and the fixed extension surface 112at.
- the distance between the inclined end portion 112as and the bottom portion 112u in the first cross direction CR is the free end length L2.
- the free end length L2 of the fixed positioning projection 112a is shorter than the free end length L1 of the movable projection 112b. Therefore, even if a force from the outside of the second electromagnetic steel plate 112 is applied to the fixed positioning protrusion 112a, the fixed positioning protrusion 112a hardly deforms. In other words, since the free end length L1 is longer than the free end length L2, the amount of elastic deformation in the circumferential direction of the movable projection 112b is greater than that of the fixed positioning projection 112a.
- the distance of the fixed positioning protrusion 112a in the second cross direction CS is the width W2.
- the width W2 of the fixed positioning projection 112a is the same as the width W1 of the movable projection 112b.
- the structure of the movable protrusion 112b and fixed positioning protrusion 112a shown in FIG. 11 is applied to the second arrangement area R2, the fourth arrangement area R4, the sixth arrangement area R6, and the eighth arrangement area R8.
- a portion of the fixed positioning projection 111a of the first electromagnetic steel plate 111 is a part of the movable projection 112b of the second electromagnetic steel plate 112. partially overlapped.
- a portion of the fixed positioning projection 112 a of the second electromagnetic steel plate 112 overlaps a portion of the movable projection 111 b of the first electromagnetic steel plate 111 .
- the rotor core 11 includes first laminated projections in which the movable projections 111b and the fixed positioning projections 112a are overlapped, and second laminated projections in which the fixed positioning projections 111a and the movable projections 112b are overlapped. 2 stacking protrusions.
- the first stack protrusion and the second stack protrusion are positioned symmetrically with respect to the center line CL1. Such symmetry of the first stack protrusion and the second stack protrusion is applied to the first placement region R1, the third placement region R3, the fifth placement region R5, and the seventh placement region R7.
- the rotor core 11 has the movable protrusions 111b and the fixed positioning protrusions 112a superimposed on each other. It has one laminated projection and a second laminated projection in which the fixed positioning projection 111a and the movable projection 112b are superimposed.
- the first stack protrusion and the second stack protrusion are positioned symmetrically with respect to the center line CL2.
- the magnet 12 is an Nd--Fe--B based sintered magnet.
- the surface of the magnet 12 is coated with antirust plating or the like.
- the magnet 12 has one cylindrical surface 12a extending in the Z direction, a flat surface 12b located on the opposite side of the cylindrical surface 12a, and two side surfaces 12c and 12d.
- the cylindrical surface 12a has a shape that protrudes in the Y direction.
- the cylindrical surface 12a has a shape corresponding to a part of a semi-cylindrical curved surface. In other words, the cylindrical surface 12a has a shape corresponding to a portion of a half-moon curved surface.
- a plurality of magnets 12 are arranged along the circumferential direction.
- the distance between the two sides 12c, 12d is designed to be slightly larger than the distance between the fixed positioning projection 111a and the movable projection 111b and the distance between the fixed positioning projection 112a and the movable projection 112b. It is
- the magnet 12 includes a first placement region R1, a second placement region R2, a third placement region R3, a fourth placement region R4, a fifth placement region R5, a sixth placement region R6, and a seventh placement region R6. It is arranged in each of the region R7 and the eighth arrangement region R8. In other words, the plurality of first magnets and the plurality of second magnets are arranged alternately in the circumferential direction.
- the magnet 12 is positioned and fixed between the movable protrusion 111b and the fixed positioning protrusion 111a.
- an elastic restoring force is generated in the movable projection 111b, and the magnet 12 is fixed between the movable projection 111b and the fixed positioning projection 111a by this elastic restoring force.
- Such fixing of the magnet 12 is performed by the first electromagnetic steel sheets 111 corresponding to the fourth electromagnetic steel sheet N4 and the 44th electromagnetic steel sheet N44 shown in FIG.
- the magnets 12 are fixed at two locations in the axial direction, the front side and the rear side. It is
- the magnet 12 is positioned and fixed between the movable protrusion 112b and the fixed positioning protrusion 112a.
- an elastic restoring force is generated in the movable projection 112b, and the magnet 12 is fixed between the movable projection 112b and the fixed positioning projection 112a by this elastic restoring force.
- Such fixing of the magnet 12 is performed by the second electromagnetic steel sheets 112 corresponding to the third electromagnetic steel sheet N3 and the 45th electromagnetic steel sheet N45 shown in FIG.
- the magnets 12 are fixed at two locations on the front side and the rear side in each of the second placement region R2, the fourth placement region R4, the sixth placement region R6, and the eighth placement region R8.
- the method of assembling the rotor unit 14 includes an adhesive application step, a magnet attachment step, an adhesive hardening step, a protection tube attachment step, and a rotating shaft press-fitting step.
- the adhesive application step is performed before the magnets 12 are attached to the rotor core 11 .
- an adhesive is applied to the outer peripheral surface 11 a of the rotor core 11 .
- the adhesive is, for example, a thermosetting silicone adhesive or a two-liquid curing acrylic adhesive. Before the adhesive hardens, the next adhesive application step is performed.
- the magnet 12 In such a fixed state, the magnet 12 is in close contact with the outer peripheral surface 11a of the rotor core 11, and the magnet 12 is pressed against the fixed positioning projection 111a by the elastic restoring force of the movable projection 111b.
- Such work is performed in the first arrangement region R1, the third arrangement region R3, the fifth arrangement region R5, and the seventh arrangement region R7, and in the fourth electromagnetic steel sheet N4 and the 44th electromagnetic steel sheet N44. , is done.
- the magnet 12 is pressed against the outer peripheral surface 11a from the outside of the rotor core 11 and inserted between the movable projection 112b and the fixed positioning projection 112a. At this time, the magnet 12 is inserted between the movable projection 112b and the fixed positioning projection 112a while the magnet 12 is in contact with the introduction tapered portion 112c formed on the movable projection 112b and the movable projection 112b is elastically deformed. Fixed.
- the magnet 12 In such a fixed state, the magnet 12 is in close contact with the outer peripheral surface 11a of the rotor core 11, and the magnet 12 is pressed against the fixed positioning projection 112a by the elastic restoring force of the movable projection 112b.
- Such work is performed on the third electromagnetic steel sheet N3 and the 45th electromagnetic steel sheet N45 in the second arrangement area R2, the fourth arrangement area R4, the sixth arrangement area R6, and the eighth arrangement area R8. .
- the positions of the plurality of magnets 12 on the eight outer peripheral surfaces 11a of the rotor core 11 are held.
- a protection tube 13 is formed outside the magnets 12 fixed to the rotor core 11 by deep drawing. Specifically, the protection tube 13 is fixed so that the magnet 12 is press-fitted inside the protection tube 13 . After that, the end surface of the protective tube 13 is bent. Thereby, the protective tube 13 is fixed in contact with the front side and the rear side of the rotor core 11 .
- each of the plurality of magnets is fixed by first electromagnetic steel sheet 111 and second electromagnetic steel sheet 112 . That is, the magnets 12 adjacent to each other are fixed by separate electromagnetic steel plates. Therefore, it is not necessary to arrange fixed positioning projections and movable projections side by side between magnets adjacent to each other, unlike conventional rotating electric machines. That is, the space between the magnets 12 can be narrowed, and the rotary electric machine 1 that is small and has high driving efficiency can be provided.
- a portion of the fixed positioning projection 111 a of the first electromagnetic steel plate 111 overlaps a portion of the movable projection 112 b of the second electromagnetic steel plate 112 .
- a portion of the fixed positioning projection 112 a of the second electromagnetic steel plate 112 overlaps a portion of the movable projection 111 b of the first electromagnetic steel plate 111 .
- the magnets 12 are not inclined with respect to the axial direction. Magnets 12 can be arranged with higher precision.
- the first laminated projections obtained by overlapping the movable projections 111b and the fixed positioning projections 112a, the fixed positioning projections 111a and the movable projections 112b are placed symmetrically with respect to the center lines CL1 and CL2.
- a well-balanced magnetic force is generated at each of the left and right ends of the magnet 12, and a balanced magnetic flux density distribution can be obtained at each of the left and right ends of the magnet 12.
- the width W1 of the movable projection 111b is larger than the width W2 of the fixed positioning projection 111a.
- the width W1 of the movable protrusion 112b is greater than the width W2 of the fixed positioning protrusion 112a.
- the free end length L1 of the movable projection 111b is longer than the free end length L2 of the fixed positioning projection 111a.
- the free end length L1 of the movable projection 112b is longer than the free end length L2 of the fixed positioning projection 112a. Therefore, the first electromagnetic steel sheet 111 and the second electromagnetic steel sheet 112 can be easily processed, and the movable projections 111b and 112b having good spring characteristics can be configured.
- the magnets 12 can be reliably pressed against the fixed positioning protrusions 111a and 112a, the magnets 12 can be positioned with high precision with respect to the outer peripheral surface 11a, and the rotation control device has excellent characteristics such as suppressing the generation of torque ripple or cogging torque.
- An electric machine 1 can be provided.
- the first electromagnetic steel sheet 111 is employed as the fourth electromagnetic steel sheet N4 and the 44th electromagnetic steel sheet N44.
- the second electromagnetic steel sheet 112 was adopted as the third electromagnetic steel sheet N3 and the 45th electromagnetic steel sheet N45.
- Other magnetic steel sheets were non-projecting magnetic steel sheets 110 .
- the magnet 12 was fixed at two locations in the axial direction, the front side and the rear side.
- the positions at which the first electromagnetic steel sheets 111, the second electromagnetic steel sheets 112, and the non-projecting electromagnetic steel sheets 110 are employed in the rotor core 11 may be changed as appropriate. Also, the number of the first electromagnetic steel sheets 111, the number of the second electromagnetic steel sheets 112, and the number of the non-projecting electromagnetic steel sheets 110 may be changed as appropriate.
- FIG. 14A is a front view showing rotor core 11 according to Modification 1 of Embodiment 1.
- the first electromagnetic steel sheet 111 is adopted as the 23rd electromagnetic steel sheet N23
- the second electromagnetic steel sheet 112 is adopted as the 24th electromagnetic steel sheet N24.
- the 23rd electromagnetic steel sheet N23 and the 24th electromagnetic steel sheet N24 correspond to the central region 11M of the rotor core 11 in the axial direction.
- the central region 11M is a region between the rear region 11R and the front region 11F. In other words, the area between the first area and the second area is the central area 11M.
- the magnet 12 is fixed at three points in the axial direction by the three first electromagnetic steel sheets 111 corresponding to the fourth electromagnetic steel sheet N4, the twenty-third electromagnetic steel sheet N23, and the forty-fourth electromagnetic steel sheet N44. ing. Similarly, the magnet 12 is fixed at three points in the axial direction by the three second magnetic steel plates 112 corresponding to the third magnetic steel plate N3, the 24th magnetic steel plate N24, and the 45th magnetic steel plate N45. It is
- the easiness of inserting the magnet 12 between the movable projection and the fixed positioning projection is adjusted. be able to. Furthermore, the holding force for holding the magnet 12 can be adjusted by the movable projection and the fixed positioning projection.
- Modified example 2 of the first embodiment Further, in Embodiment 1 described above, the number of magnets 12 is eight, and the shape of rotor core 11 is substantially a regular octagonal prism shape. Embodiment 1 does not limit the number of magnets 12 and does not limit the shape of rotor core 11 either. 14B is a top view showing rotor core 11 according to Modification 2 of Embodiment 1. FIG.
- a cylindrical rotor using segment-shaped magnets 12 is employed in the rotor core 11 according to this modified example.
- a segment-shaped magnet 12 is arranged between a movable protrusion 111b and a fixed positioning protrusion 111a.
- a segment-shaped magnet 12 is arranged between the movable projection 112b and the fixed positioning projection 112a.
- the configuration in which the segment-shaped magnets 12 are fixed to the cylindrical rotor also provides the same effects as in the first embodiment.
- FIG. 15 is a perspective view showing a rotor core.
- FIG. 16 is a top view showing the rotor core.
- FIG. 17 is a front view showing a rotor core.
- FIG. 18 is a partially exploded view showing the rotor core.
- FIG. 19 is a view showing the rotor core, and is an enlarged view showing the portion indicated by symbol C in FIG. 16.
- FIG. 20 is a top view showing the third electromagnetic steel sheet.
- FIG. 21 is a top view showing a fourth electromagnetic steel sheet.
- the rotor core 211 has the non-projecting magnetic steel sheets 110, the first magnetic steel sheets 111, and the second magnetic steel sheets 112 described in the first embodiment. Furthermore, the rotor core 211 has a third electromagnetic steel sheet 113 and a fourth electromagnetic steel sheet 114 .
- the rotor core 211 is an example of a laminated steel plate in which a plurality of electromagnetic steel plates are laminated in the Z direction.
- the first magnetic steel sheet N1, the second magnetic steel sheet N2, the ninth magnetic steel sheet N9 to the 39th magnetic steel sheet N39, the 46th magnetic steel sheet N46, and the 47th electromagnetic steel sheet N47 is the non-projection electromagnetic steel sheet 110.
- the fourth electromagnetic steel sheet N4 and the 42nd electromagnetic steel sheet N42 are the first electromagnetic steel sheets 111 .
- the sixth electromagnetic steel sheet N6 and the 44th electromagnetic steel sheet N44 are the second electromagnetic steel sheets 112 .
- the 3rd magnetic steel sheet N3, the 5th magnetic steel sheet N5, the 7th magnetic steel sheet N7, the 41st magnetic steel sheet N41, the 43rd magnetic steel sheet N43, and the 45th magnetic steel sheet N45 are the 3 is an electromagnetic steel plate 113 .
- the eighth electromagnetic steel sheet N8 and the 40th electromagnetic steel sheet N40 are the fourth electromagnetic steel sheet 114 .
- third electromagnetic steel sheet 113 is one of the plurality of electromagnetic steel sheets forming rotor core 211 . Therefore, the non-projecting magnetic steel sheet 110 includes a first arrangement region R1, a second arrangement region R2, a third arrangement region R3, a fourth arrangement region R4, a fifth arrangement region R5, a sixth arrangement region R6, and a seventh arrangement region. R7, and an eighth placement region R8.
- the third electromagnetic steel sheet 113 is an electromagnetic steel sheet different from the first electromagnetic steel sheet 111, the second electromagnetic steel sheet 112, and the fourth electromagnetic steel sheet 114, and has no projections.
- the third electromagnetic steel sheet 113 has eight outer peripheral corner portions 113C and eight straight portions 113L.
- the third electromagnetic steel sheet 113 has eight cutouts 113a provided in one-to-one correspondence with the eight outer peripheral corners 113C.
- the notch 113a is positioned at a corner of the regular octagon.
- the position of the notch 113a coincides with the movable projection 111b of the first electromagnetic steel plate 111 and the movable projection 112b of the second electromagnetic steel plate 112. That is, the notch 113a is formed so that the third electromagnetic steel plate 113 and the movable protrusions 111b and 112 do not overlap.
- the shape of the notch 113a is, for example, a substantially U shape with corners.
- the shape of the notch 113a is not limited to the shape shown in FIG.
- the depth in the extending direction of the notch 113a that is, in the depth direction of the U-shape can be adjusted.
- the shape of the recess 110a is not limited to the U shape. If it is possible to avoid contact between the movable protrusions 111b and 112b and the third electromagnetic steel plate 113, the shape of the notch 113a is appropriately selected.
- the third electromagnetic steel sheet 113 is arranged between the first electromagnetic steel sheet 111 and the second electromagnetic steel sheet 112 in the axial direction of the rotating shaft 10 .
- the third electromagnetic steel sheet 113 is in contact with the first electromagnetic steel sheet 111 and the second electromagnetic steel sheet 112 .
- the notch 113a does not overlap the first movable projection 111b of the first electromagnetic steel plate 111 and the second movable projection 112b of the second electromagnetic steel plate 112. As shown in FIG.
- fourth electromagnetic steel sheet 114 is one of the plurality of electromagnetic steel sheets forming rotor core 211 . Therefore, the non-projecting magnetic steel sheet 110 includes a first arrangement region R1, a second arrangement region R2, a third arrangement region R3, a fourth arrangement region R4, a fifth arrangement region R5, a sixth arrangement region R6, and a seventh arrangement region. R7, and an eighth placement region R8.
- the fourth electromagnetic steel sheet 114 has eight outer peripheral corner portions 114C and eight straight portions 114L.
- the fourth electromagnetic steel sheet 114 has eight guide protrusions 114a provided in one-to-one correspondence with the eight outer peripheral corner portions 114C.
- the guide projections 114a are located at the corners of the regular octagon. In other words, the guide protrusions 114a are spaced apart in the circumferential direction.
- the fourth electromagnetic steel plate 114 integrally includes a plurality of guide projections 114a spaced apart in the circumferential direction.
- the guide projection 114a is provided between a first straight portion 114LA and a second straight portion 114LB corresponding to two straight portions 114L adjacent to each other.
- the guide protrusion 114a protrudes outside the fourth electromagnetic steel plate 114 in a direction perpendicular to the first linear portion 114LA. In other words, the guide projection 114a protrudes outward from the fourth electromagnetic steel plate 114. As shown in FIG.
- the guide protrusion 114a has a connecting portion 114c, a vertically extending portion 114d, an inclined portion 114e, an inclined end portion 114f, and a tip portion 114g.
- the connection portion 114c is a portion where the second straight portion 114LB and the guide protrusion 114a are connected.
- the vertically extending portion 114d is a portion extending from the connecting portion 114c in a direction perpendicular to the first linear portion 114LA.
- the tip portion 114g is the tip located on the outermost side of the guide projection 114a in the direction orthogonal to the first straight portion 114LA.
- the inclined portion 114e is connected to the vertically extending portion 114d at the inclined end portion 114f and extends in a direction inclined with respect to the straight portion 114L.
- the inclined portion 114e is provided between the inclined end portion 114f and the tip portion 114g.
- the distance between the connecting portion 114c and the inclined end portion 114f in the direction perpendicular to the first straight portion 114LA is the free end length L3.
- the width of the guide projection 114a in the direction parallel to the first linear portion 114LA is the width W3.
- the free end length L3 is smaller than the free end length L1. Width W3 is greater than width W1. Therefore, the guide protrusion 114a has a structure that is less likely to be deformed by an external force than the movable protrusions 111b and 112b.
- the guide projection 114a is arranged so as to overlap the movable projection 111b of the first electromagnetic steel plate 111.
- the guide protrusion 114a protrudes in a direction perpendicular to the outer peripheral portion 11A.
- the movable protrusion 111b also protrudes in the direction perpendicular to the outer peripheral portion 11A.
- the distance between the outer peripheral portion 11A and the tip portion 114g of the guide projection 114a is P4.
- the distance between the outer peripheral portion 11A and the tip portion 111x of the movable protrusion 111b is P1.
- Distance P4 is equal to or greater than distance P1.
- the guide projection 114a is arranged so as to overlap the movable projection 112b of the second electromagnetic steel plate 112. As shown in FIG. Specifically, the guide protrusion 114a protrudes in a direction perpendicular to the outer peripheral portion 11A. The movable protrusion 112b also protrudes in the direction perpendicular to the outer peripheral portion 11A. The distance between the outer peripheral portion 11A and the tip portion 114g of the guide projection 114a is P4. The distance between the outer peripheral portion 11A and the tip portion 112x of the movable protrusion 112b is P2. Distance P4 is equal to or greater than distance P2.
- the guide projection 114a does not have the introductory tapered portion provided on the movable projections 111b and 112b. In other words, the guide protrusion 114a is not a part for fixing the magnet 12. As shown in FIG. The guide projection 114a is a portion that guides the magnet 12 so that the magnet 12 contacts the leading tapered portion of the movable projection 112b.
- the arrangement of the guide projections 114a on the fourth electromagnetic steel plate 114 is determined according to the amount of deformation associated with the elastic deformation of the movable projections 111b and 112b.
- the arrangement of the guide protrusions 114a is set so that the side surfaces 12d of the magnet 12 and the guide protrusions 114a do not come into contact with each other.
- the guide protrusion 114a is a displacement restricting portion that restricts displacement in the circumferential direction of the first movable protrusion 111b and the second movable protrusion 112b.
- Embodiment 2 by arranging the third electromagnetic steel sheet 113 between the first electromagnetic steel sheet 111 and the second electromagnetic steel sheet 112, the movable projections 111b and 112b do not contact each other. As a result, the movable protrusions 111b and 112b can be elastically deformed more smoothly without being affected by friction, and the magnet 12 can be reliably fixed.
- the magnets 12 are fixed to the outer peripheral portion 11A, even if the positions of the magnets 12 are shifted with respect to the rotor core 211, the magnets 12 are in contact with the guide protrusions 114a, and the guide protrusions 114a support the magnets 12. It is moved toward the outer peripheral portion 11A. This can prevent the magnet 12 from contacting the tips of the movable projections 111b and 112b. Unnecessary deformation such as buckling of the movable protrusions 111b and 112b can be prevented. Therefore, the magnet 12 is reliably fixed by the movable projections 111b and 112b whose deformation is prevented.
- a third electromagnetic steel sheet 113 is arranged between the first electromagnetic steel sheet 111 and the fourth electromagnetic steel sheet 114 .
- a first electromagnetic steel sheet 111 and two third electromagnetic steel sheets 113 are arranged between the second electromagnetic steel sheet 112 and the fourth electromagnetic steel sheet 114 . Accordingly, the movable protrusion 111b and the guide protrusion 114a do not contact each other, and the movable protrusion 112b and the guide protrusion 114a do not contact each other. Therefore, the movable protrusion 111b and the guide protrusion 114a can be elastically deformed more smoothly without being affected by friction, and the magnet 12 can be reliably fixed.
- the fourth electromagnetic steel plate 114 having the guide projections 114a since the fourth electromagnetic steel plate 114 having the guide projections 114a is used, the magnets 12 can be smoothly pushed into the rotor core 211, and the plasticity of the movable projections 111b and 112b is reduced. It is possible to prevent deformation from occurring. Therefore, the arrangement accuracy of the magnets 12 does not deteriorate, and the problem of deterioration of motor characteristics such as cogging torque does not occur.
- the rotor core 211 is provided with the fourth electromagnetic steel plate 114 having the guide projections 114a, excessive deformation of the movable projections 111b and 112b in the circumferential direction is prevented. Therefore, it is possible to prevent large plastic deformation from occurring in the movable protrusions 111b and 112b. Furthermore, it is possible to prevent the pressing force of the magnet 12 from being impaired by the movable protrusions 111b and 112b.
- the third electromagnetic steel sheet 113 is arranged between the first electromagnetic steel sheet 111 and the second electromagnetic steel sheet 112, thereby adopting a structure in which the movable protrusions 111b and 112b do not come into contact with each other.
- This modification shows another structure for avoiding contact between the movable protrusions 111b and 112b.
- FIG. 22 is a perspective view showing a first electromagnetic steel sheet 311 according to this modification.
- the first electromagnetic steel sheet 311 has a thickness T1 in the axial direction.
- the movable protrusion 111b of the first electromagnetic steel sheet 311 has a thickness T2 in the axial direction. Thickness T2 is smaller than thickness T1.
- the second electromagnetic steel sheet 312 has a thickness T1 in the axial direction.
- the movable protrusion 112b of the second electromagnetic steel sheet 312 has a thickness T2 in the axial direction. Thickness T2 is smaller than thickness T1.
- the second electromagnetic steel sheet 312 is obtained by changing the thickness of the movable protrusion 112b of the second electromagnetic steel sheet 112 shown in FIG. 9 as described above.
- the movable projections 111b and 112b can elastically deform more smoothly without being affected by friction. This allows the magnet 12 to be reliably fixed. Furthermore, since it is not necessary to use the third electromagnetic steel sheet 113, the number of types of electromagnetic steel sheets can be reduced, and the process of laminating a plurality of electromagnetic steel sheets in the rotor core 211 is simplified.
- FIG. 23 is a perspective view showing the rotor unit 414, showing a state before the magnets are fixed to the rotor unit.
- FIG. 24 is a perspective view showing a rotor unit.
- the rotor unit 414 has a rotating shaft 10 and two rotor cores 11 .
- the rotating shaft 10 is press-fitted into the first through holes 11b of the two rotor cores 11 and fixed.
- the two rotor cores 11 are arranged so as to overlap in the Z direction.
- the two rotor cores 11 are arranged so as to be displaced by a predetermined angle in the circumferential direction.
- Rotor core 11 is the rotor core described in the first embodiment.
- the rotating electrical machine according to Embodiment 3 includes multiple rotor units 14 .
- Each of the plurality of rotor units 14 corresponds to the rotor unit 14 described above.
- a plurality of rotor units 14 are fixed to the rotating shaft 10 so as to overlap each other.
- the plurality of rotor units 14 are arranged to be offset from each other in the circumferential direction.
- an adhesive or the like is applied to the outer peripheral surface 11a of the rotor core 11 in advance.
- a plurality of magnets 12 are sequentially inserted into the outer peripheral surface 11 a of the rotor core 11 .
- the movable protrusions 111b and 112b press the magnet 12 against the outer peripheral surface 11a, determine the position of the magnet 12, and hold the position of the magnet 12. .
- the rotor unit 414 shown in FIG. 23 is obtained.
- multiple magnets 12 are fixed to rotor core 11 with high accuracy.
- a temporary holding jig for hardening the adhesive used for adhering the magnet 12 is not required, and there is no work for attaching or removing the temporary holding jig. Therefore, it is possible to provide the rotary electric machine 1 with even better assembly workability.
- rotor core 211 described in the second embodiment may be used instead of rotor core 11 .
- each embodiment can be appropriately combined, modified, or omitted.
- Introductory tapered portion 111C Peripheral corner portion 111L... Straight portion 111p... First movable oblique concave portion 111p... Concave portion 111q... First movable orthogonal concave portion 111q... Concave portion 111r, 111s, 111u... Bottom portion , 111t... First fixed extension concave part, 111x... Tip part, 112... Second electromagnetic steel plate, 112a... Fixed positioning protrusion (second fixed positioning protrusion), 112af... Tip part, 112ak... Inclined part, 112as...
- Inclined end part 112at...fixed extension surface, 112b...second movable projection, 112bx...movable extension surface, 112c...introduction taper portion, 112C...peripheral corner portion, 112L...straight line portion, 112p...second movable oblique concave portion, 112p... Recess 112q Second movable orthogonal recess 112q Recess 112r, 112s, 112u Bottom 112t Second fixed extending recess 112x Tip 113 Third electromagnetic steel sheet 113a Notch 113C Peripheral corner portion 113L... Straight portion 114... Fourth electromagnetic steel sheet 114a... Guide projection 114c... Connection portion 114C...
- Peripheral corner part 114d Vertically extending portion 114e... Inclined portion 114f... Inclined end portion 114g... Tip part 114L... Straight part 114LA... First straight part 114LB... Second straight part 211... Rotor core 311... First electromagnetic steel sheet 312... Second electromagnetic steel sheet
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Abstract
Description
特許文献1は、固定位置決め突起と可動位置決め突起との間に磁石が押し込まれ、かつ、接着剤により磁石を固定する構造を開示している。
図1~図24において、互いに同一又は同様の構成部分には同じ符号が付されている。
図面は、模式的又は概念的に実施の形態を示している。図面に示されている各部分の厚みと幅との関係、部分間の大きさの比率等は、必ずしも実際の部材と同一とは限らない。
本開示の特徴に関係しない構成の図示が省略されている場合がある。
さらに、図面においては、X方向及びY方向に交差する方向が示されている場合がある。例えば、X方向に対して交差する方向を第1交差方向CRと称する。Y方向に対して交差する方向を第2交差方向CSと称する。第1交差方向CRとX方向との間の角度は、例えば、45度である。第2交差方向CSとY方向との間の角度は、例えば、45度である。第1交差方向CRと第2交差方向CSは、互いに、交差する(例えば直交する)。
実施の形態1に係る回転電機を図1~図13を参照して説明する。
<回転電機1の全体構成>
図1は、回転電機1を示す断面図である。
回転電機1は、フレーム2と、固定子3と、インシュレータ4と、固定子巻線5と、ターミナル6と、軸受7と、軸受ホルダ8と、軸受9と、回転子ユニット14と、ジョイント15と、ヒートシンク16とを備える。
回転電機1には、回転電機1の駆動状態を検出するセンサ17と、回転電機1の駆動を制御する制御装置18とが接続されている。
フレーム2は、回転電機1を構成する筐体である。フレーム2を形成する材料は、例えば、安価で軽量なアルミニウム合金である。フレーム2は、フレーム本体2Mと台座2Dとを有する。フレーム本体2Mは、開口部2Aと内壁面2Bを有する。開口部2Aは、フレーム2のリア側に位置する部位である。内壁面2Bが露出する領域、すなわち、フレーム本体2Mの内側の空間は、回転電機1を構成する複数の部材が配置される内側領域2Cである。
固定子3は、内側領域2Cに配置され、フレーム2に固定されている。
固定子3は、複数の電磁鋼板を有する。複数の電磁鋼板は、例えば、軸方向において積層されている。
固定子3の径方向外側の位置において、固定子3は、固定子外側面3Aを有する。
固定子3の径方向内側の位置において、固定子3は、固定子内側面3Bを有する。
軸方向において、固定子3は、固定子上面3Cと、固定子下面3Dとを有する。固定子下面3Dは、固定子上面3Cとは反対側に位置する面である。
固定子3は、例えば、固定子鉄心を称することもできる。
固定子3が内側領域2Cに配置されている状態で、固定子内側面3Bは、回転子ユニット14に対向する。
インシュレータ4は、公知の絶縁材料、例えば、樹脂材料で形成されている。
インシュレータ4は、固定子上面3Cの一部及び固定子下面3Dの一部を覆うように固定子3に配置されている。インシュレータ4は、固定子3と固定子巻線5との間に配置されている。インシュレータ4は、固定子巻線5と固定子3とを電気的に絶縁する。
固定子巻線5は、公知の配線、例えば、樹脂等の絶縁膜が被覆された銅線である。
固定子3と固定子巻線5との間にインシュレータ4が介在するように、固定子3には固定子巻線5が巻回されている。
ターミナル6は、導電性を有する公知の金属材料で形成されている。
ターミナル6は、固定子巻線5に電気的に接続されている。ターミナル6は、回転電機1の外部に配置されている制御装置18に電気的に接続されている。ターミナル6は、制御装置18から出力される電力を固定子巻線5に供給する。
軸受7及び軸受9は、例えば、公知のボールベアリング又はローラベアリング等である。軸受ホルダ8は、フレーム2のリア側に配置されている。言い換えると、フレーム2の開口部2Aに位置する。
軸受9は、フレーム2のリア側に配置されている。言い換えると、軸受9は、軸受ホルダ8における径方向内側の位置、すなわち、軸方向上に配置されている。
図2は、回転子ユニット14を示す斜視図である。
回転子ユニット14は、回転子の一例である。
回転子ユニット14は、回転軸10と、回転子コア11と、複数の磁石12と、保護管13を有する。回転子ユニット14は、固定子3と離間しており、固定子3に囲まれるように配置されている。
複数の磁石12は、回転子コア11の外周部11Aに接着されている。すなわち、複数の磁石12は、回転子コア11の外周部11Aに固定されている。
保護管13は、複数の磁石12を含めて、回転子ユニット14の径方向外側の部位を被覆している。保護管13は、回転子コア11に固定された磁石12の外側に設けられている。保護管13は、例えば、深絞り加工によって形成されている。
保護管13は、磁石12が割れた場合、又は、回転子ユニット14から外れたりした場合に、回転子ユニット14の回転が停止すること防ぐための部材である。保護管13は、回転子ユニット14に取り付けられている。なお、回転子ユニット14は、保護管13が備えなくてもよいが、実施の形態1においては、回転子ユニット14が保護管13を備えた構成が採用されている。
ジョイント15は、回転軸10の端部10Bに設置されている。
ジョイント15は、回転軸10の端部10Bと車両の回転軸と組付ける部材である。ジョイント15は、例えば、強度を有する公知の金属材料で形成されている。
ヒートシンク16は、フレーム2のリア側に配置されている。言い換えると、ヒートシンク16は、フレーム2の開口部2Aにおける軸受ホルダ8の外側に位置する開口端に配置されている。ヒートシンク16は、熱伝導性に優れた公知の金属材料で形成されている。ヒートシンク16には、不図示の制御装置が設置されている。
回転軸10の端部10Cには、センサ17が設置されている。センサ17は、回転子コア11の回転状態を検出する。センサ17は、例えば、公知の回転角度検出センサである。
制御装置18は、電力変換回路と制御回路を有する。電力変換回路は、例えば、パワー半導体を有する電力変換回路である。電力変換回路は、制御装置18の外部から供給された直流電流を交流電流に変換する。制御装置18は、ターミナル6を介して固定子巻線5に供給される電流量を制御する。
次に、実施の形態1に係る回転子ユニット14の構成について詳細に説明する。
図3は、回転子コア11を示す斜視図である。図4は、回転子コア11を示す上面図である。図5は、回転子コア11を示す正面図である。図6は、回転子コア11を示す部分分解図である。図7は、非突起電磁鋼板110を示す上面図である。図8は、第1電磁鋼板111を示す上面図である。図9は、第2電磁鋼板112を示す上面図である。図10は、第1電磁鋼板111を示す図であって、図8の符号Aで示された部分を示す拡大図である。図11は、第2電磁鋼板112を示す図であって、図9の符号Bで示された部分を示す拡大図である。図12は、磁石12を示す上面図である。図13は、磁石12を回転子コア11に取り付けた後の状態を示す斜視図である。
回転子コア11の外形形状は、例えば、略正八角柱形状である。略正八角柱形状とは、回転子コア11の全体形状を意味しており、幾何学的に定義された正八角柱のみを意味するとは限らない。略正八角柱は、正八角柱の角部が面取りされた形状、製造上の誤差を含む形状、径方向外側に突出する凸部、径方向内側に凹む凹部、段差等を部分的に含む正八角柱形状を意味する。
8個の外周面11aの各々は、磁石12が配置される領域である。周方向において時計回りに並ぶ8個の外周面11aを、順に、第1配置領域R1、第2配置領域R2、第3配置領域R3、第4配置領域R4、第5配置領域R5、第6配置領域R6、第7配置領域R7、及び第8配置領域R8と称する場合がある。外周面11aは、外周部11Aに対応する。
第1番目の電磁鋼板N1~第47番目の電磁鋼板N47によって回転子ユニット14の積層鋼板が構成されている。
回転子コア11は、非突起電磁鋼板110と、第1電磁鋼板111と、第2電磁鋼板112とを有する。
非突起電磁鋼板110、第1電磁鋼板111、及び第2電磁鋼板112の形状は、Z方向に見て、略正八角形である。
図5に示すように、第1番目の電磁鋼板N1、第2番目の電磁鋼板N2、第5番目の電磁鋼板N5~第43番目の電磁鋼板N43、第46番目の電磁鋼板N46、及び第47番目の電磁鋼板N47は、非突起電磁鋼板110である。
非突起電磁鋼板110は、8つの外周角部110Cと、8つの直線部110Lとを有する。非突起電磁鋼板110は、8つの外周角部110Cに1対1で対応するように設けられた8つの凹部110aを有する。凹部110aは、正八角形の角部に位置する。
図5に示すように、第4番目の電磁鋼板N4及び第44番目の電磁鋼板N44は、第1電磁鋼板111である。言い換えると、第1電磁鋼板111は、軸方向における回転子コア11のリア領域11R及びフロント領域11Fに配置されている。リア領域11Rは、第1領域の一例である。フロント領域11Fは、第2領域の一例である。
図10に示すように、可動突起111bは、Y方向に延在する。第1電磁鋼板111は、X方向において可動突起111bの両側に設けられた2つの凹部111p、111qを有する。
2つの凹部111p、111qのうち、可動突起111bとX方向に延びる直線部111Lとの間に設けられた凹部は、第1可動直交凹部111qである。
2つの凹部111p、111qのうち、可動突起111bと第1交差方向CRに延びる直線部111Lとの間に設けられた凹部は、第1可動斜方凹部111pである。
固定位置決め突起111aは、Y方向に延在する。第1電磁鋼板111は、X方向において固定位置決め突起111aの隣りに設けられた1つの第1固定延在凹部111tを有する。第1固定延在凹部111tは、固定位置決め突起111aとX方向に延びる直線部111Lとの間に設けられている。
言い換えると、自由端長L1は自由端長L2よりも大きいため、可動突起111bの周方向における弾性変形量は、固定位置決め突起111aよりも大きい。
X方向における固定位置決め突起111aの幅は、幅W2である。固定位置決め突起111aの幅W2は、可動突起111bの幅W1と同じである。
図5に示すように、第3番目の電磁鋼板N3及び第45番目の電磁鋼板N45は、第2電磁鋼板112である。言い換えると、第2電磁鋼板112は、軸方向における回転子コア11のリア領域11R及びフロント領域11Fに配置されている。
図9に示すように、第2電磁鋼板112は、8つの外周角部112Cと、8つの直線部112Lとを有する。第2電磁鋼板112は、8つの外周角部112Cのうちの4つの外周角部112Cに1対1で対応するように設けられた固定位置決め突起112aと、残りの4つの外周角部112Cに1対1で対応するように設けられた可動突起112bとを有する。つまり、第2電磁鋼板112は、4つの固定位置決め突起112aと、4つの可動突起112bを一体的に備えている。第2電磁鋼板112は、周方向において第1磁石12に隣接するとともに複数の磁石12の一つである第2磁石12を固定する電磁鋼板である。以下の説明では、第2磁石12を単に磁石12と称する。
図11に示すように、可動突起112bは、第1交差方向CRに延在する。第2電磁鋼板112は、第2交差方向CSにおいて可動突起112bの両側に設けられた2つの凹部112p、112qを有する。
2つの凹部112p、112qのうち、可動突起112bと第2交差方向CSに延びる直線部112Lとの間に設けられた凹部は、第2可動直交凹部112qである。
2つの凹部112p、112qのうち、可動突起112bとX方向に延びる直線部112Lとの間に設けられた凹部は、第2可動斜方凹部112pである。
固定位置決め突起112aは、第1交差方向CRに延在する。第2電磁鋼板112は、第2交差方向CSにおいて固定位置決め突起112aの隣りに設けられた1つの第2固定延在凹部112tを有する。第2固定延在凹部112tは、固定位置決め突起112aと第2交差方向CSに延びる直線部112Lとの間に設けられている。
言い換えると、自由端長L1は自由端長L2よりも大きいため、可動突起112bの周方向における弾性変形量は、固定位置決め突起112aよりも大きい。
第2交差方向CSにおける固定位置決め突起112aの距離は、幅W2である。固定位置決め突起112aの幅W2は、可動突起112bの幅W1と同じである。
図4に示すように、平面視において、回転子コア11は、可動突起111bと固定位置決め突起112aとが重ね合わされた第1積層突起と、固定位置決め突起111aと可動突起112bとが重ね合わされた第2積層突起とを有する。第1積層突起及び第2積層突起は、中心線CL1に対して対称に位置している。このような第1積層突起及び第2積層突起の対称性は、第1配置領域R1、第3配置領域R3、第5配置領域R5、及び第7配置領域R7に適用されている。
磁石12は、Nd-Fe-B系の焼結磁石である。磁石12の表面は、防錆用のめっき等のコーティングが施されている。磁石12は、Z方向に延びる1つの円筒面12aと、円筒面12aとは反対側に位置する平面12bと、2つの側面12c、12dとを有する。
次に、回転子ユニット14の組立方法について説明する。
後述するように、回転子ユニット14の組立方法は、接着剤の塗布工程、磁石の取り付け工程、接着剤の硬化工程、保護管の取り付け工程、及び回転軸の圧入工程を有する。
接着剤の塗布工程は、磁石12を回転子コア11に取り付ける前に行われる。
まず、回転子コア11の外周面11aに接着剤を塗布する。接着剤は、例えば、熱硬化型シリコーン系接着剤又は2液硬化型アクリル系接着剤等である。
接着剤が硬化する前に、次の接着剤塗布工程が行われる。
まず、可動突起111b及び固定位置決め突起111aによる磁石の取り付けについて説明する。回転子コア11の外部から外周面11aに磁石12を押し付けて、可動突起111bと固定位置決め突起111aとの間に磁石12を挿入する。この際、可動突起111bに形成されている導入テーパ部111cに磁石12が接触しながら、可動突起111bが弾性変形しつつ、可動突起111bと固定位置決め突起111aとの間に磁石12が挿入され、固定される。
これにより、回転子コア11の8つの外周面11aにおける複数の磁石12の位置が保持される。
次に、接着剤を硬化する。これにより、複数の磁石12は、回転子コア11の8つの外周面11aおいて高精度に固定される。
深絞り加工により、回転子コア11に固定された磁石12の外側に保護管13を形成する。具体的に、磁石12を保護管13の内部に圧入するように保護管13を固定する。その後、保護管13の端面を折り曲げる。これにより、保護管13は、回転子コア11のフロント側及びリア側に接触して固定される。
最後に、回転子コア11の第1貫通穴11bに回転軸10を圧入する。これにより、回転子ユニット14が完成する。
なお、上述した回転子ユニット14の組立方法においては、回転子コア11に磁石12を固定した後に回転軸10を圧入固定した。実施の形態1は、このような工程に限定されない。回転子コア11に回転軸10を圧入して固定した後に、上述した接着剤の塗布工程、磁石の取り付け工程、接着剤の硬化工程、及び保護管の取り付け工程を行ってもよい。
実施の形態1によれば、複数の磁石の各々が第1電磁鋼板111及び第2電磁鋼板112によって固定されている。すなわち、互いに隣接する磁石12は、別々の電磁鋼板によって固定されている。したがって、従来の回転電機のように、互いに隣接する磁石の間に、固定位置決め突起と可動突起とを並べて配置する必要がない。すなわち、磁石12の間隔を狭く構成でき、小型で駆動効率の高い回転電機1を提供することができる。
これにより、複数の磁石12のうち互いに隣り合う2つの周方向における間隔を狭くすることができる。小型で、磁力を有効に使った駆動効率の高い回転電機1を実現することができる。
これにより、磁石12の左端及び右端の各々において、バランス良く磁力が発生し、磁石12の左端及び右端の各々においてバランスした磁束密度の分布を得ることができる。
このため、従来の回転電機のような磁束密度の分布のアンバランスが発生せず、良好なモータ特性を得ることができる。
このため、第1電磁鋼板111及び第2電磁鋼板112の加工が容易であるとともに、良好なバネ特性を有した可動突起111b、112bを構成することができる。
以下の説明では、実施の形態1と同一部材には同一符号を付して、その説明は省略または簡略化する。
上述した実施の形態1では、第4番目の電磁鋼板N4及び第44番目の電磁鋼板N44として第1電磁鋼板111を採用した。第3番目の電磁鋼板N3及び第45番目の電磁鋼板N45として第2電磁鋼板112を採用した。その他の電磁鋼板は、非突起電磁鋼板110とした。これにより、軸方向における2箇所であるフロント側及びリア側にて、磁石12を固定した。
本変形例では、実施の形態1の構成に加えて、第23番目の電磁鋼板N23として第1電磁鋼板111を採用し、第24番目の電磁鋼板N24として第2電磁鋼板112を採用した。第23番目の電磁鋼板N23及び第24番目の電磁鋼板N24は、軸方向における回転子コア11の中央領域11Mに相当する。中央領域11Mは、リア領域11Rとフロント領域11Fとの間の領域である。言い換えると、第1領域と第2領域との間の領域が中央領域11Mである。
同様に、第3番目の電磁鋼板N3、第24番目の電磁鋼板N24、及び第45番目の電磁鋼板N45に相当する3つの第2電磁鋼板112により、軸方向における3箇所にて磁石12が固定されている。
また、上述した実施の形態1では、磁石12の個数は8個であり、回転子コア11の形状は略正八角柱形状である。実施の形態1は、磁石12の個数を限定しておらず、回転子コア11の形状も限定しない。
図14Bは、実施の形態1の変形例2に係る回転子コア11を示す上面図である。
上述したように、セグメント型形状の磁石12が円筒形状の回転子に固定された構成においても、実施の形態1と同様の効果が得られる。
実施の形態2に係る回転子コア11の構成について図15~図21を参照して説明する。図15は、回転子コアを示す斜視図である。図16は、回転子コアを示す上面図である。図17は、回転子コアを示す正面図である。図18は、回転子コアを示す部分分解図である。図19は、回転子コアを示す図であって、図16の符号Cで示された部分を示す拡大図である。図20は、第3電磁鋼板を示す上面図である。図21は、第4電磁鋼板を示す上面図である。
図20に示すように、第3電磁鋼板113は、回転子コア211を構成する複数の電磁鋼板の一つである。このため、非突起電磁鋼板110は、第1配置領域R1、第2配置領域R2、第3配置領域R3、第4配置領域R4、第5配置領域R5、第6配置領域R6、第7配置領域R7、及び第8配置領域R8を有する。
第3電磁鋼板113は、8つの外周角部113Cと、8つの直線部113Lとを有する。第3電磁鋼板113は、8つの外周角部113Cに1対1で対応するように設けられた8つの切欠部113aを有する。切欠部113aは、正八角形の角部に位置する。
図21に示すように、第4電磁鋼板114は、回転子コア211を構成する複数の電磁鋼板の一つである。このため、非突起電磁鋼板110は、第1配置領域R1、第2配置領域R2、第3配置領域R3、第4配置領域R4、第5配置領域R5、第6配置領域R6、第7配置領域R7、及び第8配置領域R8を有する。
以下の説明では、第1配置領域R1におけるガイド突起114aの構造について説明する。他の配置領域R2~R8は、第1配置領域R1と同じ構造を有するため、説明を省略する。
ガイド突起114aは、第1直線部114LAに直交する方向に向けて、第4電磁鋼板114の外側に突出している。言い換えると、ガイド突起114aは、第4電磁鋼板114の外側に向けて突出している。
言い換えると、ガイド突起114aは、第1可動突起111b及び第2可動突起112bの周方向における変位を規制する変位規制部である。
実施の形態2によれば、第1電磁鋼板111と第2電磁鋼板112との間に第3電磁鋼板113を配置することで、可動突起111b及び可動突起112bは互いに接触することがない。これにより、可動突起111b及び可動突起112bは、摩擦の影響を受けずに、より滑らかに弾性変形することができ、磁石12を確実に固定することが可能となる。
上述した実施の形態2では、第3電磁鋼板113を第1電磁鋼板111と第2電磁鋼板112との間に配置することによって可動突起111bと可動突起112bとが接触しなし構造が採用した。本変形例は、可動突起111bと可動突起112bとの接触を回避する別の構造を示す。
図22に示すように、第1電磁鋼板311は、軸方向における厚さT1を有する。第1電磁鋼板311の可動突起111bは、軸方向における厚さT2を有する。厚さT2は、厚さT1よりも小さい。
次に、回転電機1に適用される段スキュー構造を有する回転子ユニット414について説明する。図23は、回転子ユニット414を示す斜視図であって、磁石が回転子ユニットに固定される前の状態を示す図である。図24は、回転子ユニットを示す斜視図である。
図23に示すように、回転子ユニット414は、回転軸10と、2つの回転子コア11を有する。回転軸10は、2つの回転子コア11の第1貫通穴11bに圧入され、固定されている。2つの回転子コア11は、Z方向に向けて重なるように配置されている。2つの回転子コア11は、周方向において所定の角度でずれるように配置されている。回転子コア11は、上述した実施の形態1において説明した回転子コアである。
次に、回転子ユニット414の組立方法について説明する。
回転子ユニット414の組立方法は、上述した回転子ユニット14の組立方法と同様である。
磁石12が回転子コア11の外周面11aと密着した状態においては、可動突起111b、112bによって磁石12が外周面11aに押し付けられ、磁石12の位置が決定し、磁石12の位置が保持される。
以上のように、段スキュー構造を有する回転子ユニット414において、回転子コアの個数又は磁石の個数が増えても、複数の磁石12を簡単に固定することが可能になる。磁石12の接着に用いられる接着剤を硬化するための仮押さえ治具が不要であり、仮押さえ治具の付け外し作業も無い。したがって、組み立て作業性がより一層優れた回転電機1を提供することができる。
なお、回転子ユニット414においては、回転子コア11に代えて、上述した実施の形態2において説明した回転子コア211を用いてもよい。
なお、本開示は、各実施の形態を適宜、組み合わせ、変形、省略することができる。
Claims (9)
- 固定子と、
回転軸と、前記回転軸に固定された複数の電磁鋼板によって構成されているとともに外周部を有する積層鋼板と、周方向に交互に前記外周部上に配置された複数の第1磁石及び複数の第2磁石とを有し、前記固定子から離間し、前記固定子に囲まれた回転子と、
を備え、
前記積層鋼板は、前記複数の第1磁石を固定する第1電磁鋼板と、前記複数の第2磁石を固定する第2電磁鋼板とを有し、
前記第1電磁鋼板は、前記周方向における前記第1磁石の一端を位置決めするとともに前記第1電磁鋼板の外側に向けて突出する第1固定位置決め突起と、前記周方向における前記第1磁石の他端を前記第1固定位置決め突起に向けて押圧するとともに前記第1電磁鋼板の外側に向けて突出する第1可動突起とを有し、
前記第2電磁鋼板は、前記周方向における前記第2磁石の一端を位置決めするとともに前記第2電磁鋼板の外側に向けて突出する第2固定位置決め突起と、前記周方向における前記第2磁石の他端を前記第2固定位置決め突起に向けて押圧するとともに前記第2電磁鋼板の外側に向けて突出する第2可動突起とを有する、
回転電機。 - 前記第1電磁鋼板及び前記第2電磁鋼板は、前記回転軸の軸方向における一方の領域である第1領域と、前記軸方向における他方の領域である第2領域とに配置されている、
請求項1に記載の回転電機。 - 前記第1電磁鋼板及び前記第2電磁鋼板は、前記第1領域と前記第2領域との間に配置されている、
請求項2に記載の回転電機。 - 前記第1可動突起の自由端長は、前記第1固定位置決め突起の自由端長よりも大きく、
前記第2可動突起の自由端長は、前記第2固定位置決め突起の自由端長よりも大きく、
請求項1から請求項3のいずれか一項に記載の回転電機。 - 前記積層鋼板は、前記回転軸の軸方向において前記第1電磁鋼板と前記第2電磁鋼板との間に配置された第3電磁鋼板を有し、
前記第3電磁鋼板は、前記第1電磁鋼板及び前記第2電磁鋼板に接触しており、
前記第3電磁鋼板は、切欠部を有し、
前記軸方向に見て、前記切欠部は、前記第1電磁鋼板の前記第1可動突起及び前記第2電磁鋼板の前記第2可動突起に重ならない、
請求項1から請求項4のいずれか一項に記載の回転電機。 - 前記回転軸の軸方向における前記第1電磁鋼板の前記第1可動突起の厚さは、前記第1電磁鋼板の厚さよりも小さく、
前記軸方向における前記第2電磁鋼板の前記第2可動突起の厚さは、前記第2電磁鋼板の厚さよりも小さい、
請求項1から請求項4のいずれか一項に記載の回転電機。 - 前記積層鋼板は、前記周方向に離間する複数のガイド突起を有する第4電磁鋼板を有し、
前記複数のガイド突起の各々は、前記第4電磁鋼板の外側に向けて突出し、かつ、先端部を有し、
前記回転軸の軸方向に見て、前記複数のガイド突起のうち一つは、前記第1可動突起と重なっており、
前記回転子の前記外周部と前記ガイド突起の前記先端部との間の距離は、前記回転子の前記外周部と前記第1可動突起の先端部との間の距離以上であり、
前記回転軸の軸方向に見て、前記複数のガイド突起のうち一つは、前記第2可動突起と重なっており、
前記回転子の前記外周部と前記ガイド突起の前記先端部との間の距離は、前記回転子の前記外周部と前記第2可動突起の先端部との間の距離以上である、
請求項1から請求項6のいずれか一項に記載の回転電機。 - 前記ガイド突起は、前記第1可動突起及び前記第2可動突起のうち少なくとも一方の前記周方向の変位を規制する変位規制部である、
請求項7に記載の回転電機。 - 各々が前記回転子に対応する複数の回転子を有し、
前記複数の回転子は、互いに重なるように前記回転軸に固定され、
前記複数の回転子は、前記周方向において互いにずれて配置されている、
請求項1から請求項8のいずれか一項に記載の回転電機。
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