WO2022190308A1 - Rotor, moteur électrique, ventilateur, climatiseur et procédé de fabrication de rotor - Google Patents

Rotor, moteur électrique, ventilateur, climatiseur et procédé de fabrication de rotor Download PDF

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Publication number
WO2022190308A1
WO2022190308A1 PCT/JP2021/009737 JP2021009737W WO2022190308A1 WO 2022190308 A1 WO2022190308 A1 WO 2022190308A1 JP 2021009737 W JP2021009737 W JP 2021009737W WO 2022190308 A1 WO2022190308 A1 WO 2022190308A1
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WO
WIPO (PCT)
Prior art keywords
rotor
rotor core
magnetic pole
magnetic
shaft
Prior art date
Application number
PCT/JP2021/009737
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English (en)
Japanese (ja)
Inventor
勇二 廣澤
昌弘 仁吾
Original Assignee
三菱電機株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 三菱電機株式会社 filed Critical 三菱電機株式会社
Priority to PCT/JP2021/009737 priority Critical patent/WO2022190308A1/fr
Priority to JP2023505005A priority patent/JPWO2022190308A1/ja
Publication of WO2022190308A1 publication Critical patent/WO2022190308A1/fr

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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
    • H02K1/22—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
    • H02K1/2746—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 arranged with the same polarity, e.g. consequent pole type
    • 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

Definitions

  • the permanent magnets attached to the rotor core constitute the first magnetic pole, and part of the rotor core constitutes the second magnetic pole (see, for example, Patent Document 1).
  • the magnetic flux emitted from the rotor interlinks with the stator coils surrounding the rotor, generating an induced voltage.
  • the magnetic flux density distribution be symmetrical with respect to the pole center in both the first magnetic pole and the second magnetic pole.
  • stator magnetic field generated by the stator coil current acts on the rotor. Since there is no permanent magnet in the second magnetic pole, the traveling direction of magnetic flux passing through the second magnetic pole is likely to change under the influence of the stator magnetic field. As a result, the magnetic flux density distribution in the second magnetic pole is biased to one side in the circumferential direction, which may increase vibration.
  • the present disclosure has been made to solve the above problems, and aims to suppress the unevenness of the magnetic flux density distribution on the surface of the consequent-pole rotor, thereby suppressing vibration.
  • the split surface is formed at the center of the second magnetic pole of the rotor core, even if affected by the stator magnetic field, the direction of travel of the magnetic flux passing through the second magnetic pole is less likely to change. Therefore, it is possible to suppress the unevenness of the magnetic flux density distribution on the surface of the rotor, thereby suppressing the vibration.
  • FIG. 2 is a partial cross-sectional view showing the electric motor of Embodiment 1;
  • FIG. 2 is a plan view showing the stator core of Embodiment 1;
  • FIG. 2 is a cross-sectional view showing the rotor of Embodiment 1;
  • FIG. 2 is a cross-sectional view showing a portion corresponding to one magnetic pole of the rotor of Embodiment 1;
  • FIG. FIG. 2 is a diagram showing rotor core pieces and permanent magnets according to the first embodiment;
  • 2 is a longitudinal sectional view showing the rotor of Embodiment 1;
  • FIG. 4 is a flow chart showing a manufacturing process of the rotor of Embodiment 1.
  • FIG. 4 is a flow chart showing a manufacturing process of the rotor of Embodiment 1.
  • FIG. 4 is a plan view showing a base substrate from which laminated elements of the rotor of Embodiment 1 are punched;
  • FIG. 1 is a longitudinal sectional view showing a molding die of Embodiment 1;
  • FIG. 4 is a schematic diagram showing a state in which the rotor core pieces and the shaft of Embodiment 1 are arranged in a molding die;
  • FIG. 7A is a cross-sectional view showing a rotor of Comparative Example 1
  • FIG. 7B is a cross-sectional view showing a rotor of Comparative Example 2;
  • 7A and 7B are schematic diagrams showing the flow of magnetic flux in the rotor of Comparative Example 2.
  • FIG. 1 is a longitudinal sectional view showing a molding die of Embodiment 1
  • FIG. 4 is a schematic diagram showing a state in which the rotor core pieces and the shaft of Embodiment 1 are arranged in a molding die
  • FIG. 7A is a cross-sectional view showing a
  • FIG. 4A and 4B are schematic diagrams showing the flow of magnetic flux in the rotor of the first embodiment
  • FIG. FIG. 8A is a cross-sectional view showing a rotor of Embodiment 2
  • FIG. 8B is a cross-sectional view showing a part of the rotor
  • 7A and 7B are schematic diagrams showing the flow of magnetic flux in the rotor of the second embodiment
  • FIG. FIG. 12A is a cross-sectional view (A) showing a rotor of Embodiment 3
  • (B) is a cross-sectional view showing a part of the rotor
  • 8A and 8B are schematic diagrams showing the flow of magnetic flux in the rotor of Embodiment 3.
  • FIG. 13A is a cross-sectional view (A) showing a rotor of Embodiment 4, and (B) is a cross-sectional view showing a part of the rotor.
  • 10A and 10B are schematic diagrams showing the flow of magnetic flux in the rotor of Embodiment 4.
  • FIG. FIG. 4A is a cross-sectional view showing one configuration example of a rotor
  • FIG. 7B is a cross-sectional view showing a part of the rotor.
  • 1A and 1B are a diagram (A) showing a configuration example of an air conditioner to which an electric motor of each embodiment can be applied, and a cross-sectional view (B) showing an outdoor unit;
  • FIG. 1 is a longitudinal sectional view showing electric motor 1 according to Embodiment 1.
  • the electric motor 1 is used, for example, as a blower of an air conditioner, and is driven by an inverter.
  • the electric motor 1 is an IPM (internal magnet type) motor in which permanent magnets 25 are embedded in the rotor 2 .
  • the electric motor 1 has a shaft 11 , a rotor 2 attached to the shaft 11 , and a molded stator 5 surrounding the rotor 2 .
  • the molded stator 5 has an annular stator 5A surrounding the rotor 2 and a molded resin portion 56 covering the stator 5A.
  • a shaft 11 is a rotating shaft of the rotor 2 .
  • the direction of the axis Ax which is the central axis of the shaft 11, will be referred to as the "axial direction".
  • a circumferential direction centered on the axis Ax of the shaft 11 (indicated by an arrow R in FIG. 2, etc.) is referred to as a "circumferential direction.”
  • a radial direction about the axis Ax of the shaft 11 is called a "radial direction”.
  • a cross-sectional view in a plane perpendicular to the axial direction is called a transverse cross-sectional view, and a cross-sectional view in a plane parallel to the axial direction is called a longitudinal cross-sectional view.
  • the shaft 11 protrudes from the molded stator 5 to the left in FIG. 1, and an attachment portion 11a formed in the protruding portion is attached with, for example, an impeller 505 (FIG. 21(A)) of a blower. Therefore, the projecting side of the shaft 11 (the left side in FIG. 1) is called the "load side”, and the opposite side (the right side in FIG. 1) is called the "anti-load side”.
  • the molded stator 5 has the stator 5A and the molded resin portion 56 as described above.
  • the stator 5A surrounds the rotor 2 from the radial outside.
  • Stator 5 ⁇ /b>A has stator core 50 , insulating portion 54 provided in stator core 50 , and coil 55 wound around stator core 50 via insulating portion 54 .
  • the mold resin portion 56 is made of thermosetting mold resin such as unsaturated polyester resin (BMC), epoxy resin, or the like.
  • the molded resin portion 56 has a bearing support portion 57 on one side (here, the anti-load side) in the axial direction, and has an opening 58 on the other side (here, the load side).
  • the rotor 2 is inserted into the hollow portion inside the molded stator 5 through the opening 58 .
  • the stator core 50 has a yoke 51 extending annularly in a circumferential direction around the axis Ax, and a plurality of teeth 52 extending radially inward from the yoke 51 . Tip portions of the teeth 52 face the outer circumference of the rotor 2 (FIG. 1). Although the number of teeth 52 is 12 here, it is not limited to this.
  • the stator core 50 is divided into a plurality of split cores 50A for each tooth 52 here.
  • the number of split cores 50A is twelve here.
  • the split core 50A is split by a split surface 51a formed in the yoke 51.
  • a thin portion 51b is formed between the end of the dividing surface 51a and the outer circumference of the yoke 51.
  • the plastic deformation of the thin portion 51b allows the stator core 50 to be deployed in a strip shape.
  • the stator core 50 is not limited to a combination of the split cores 50A, and may be integrally formed in an annular shape.
  • the coil 55 is wound around the tooth 52 (Fig. 2) via the insulating portion 54.
  • the coil 55 has a conductor made of copper wire or aluminum wire.
  • a substrate 6 is arranged on one side of the stator 5A in the axial direction (here, the side opposite to the load).
  • the substrate 6 is a printed substrate on which a driving circuit 60 such as a power transistor for driving the electric motor 1, a magnetic sensor and the like are mounted, and lead wires 61 are wired.
  • the lead wires 61 of the substrate 6 are led out to the outside of the electric motor 1 from a lead wire outlet component 62 attached to the outer peripheral portion of the mold resin portion 56 .
  • the bracket 15 is press-fitted into an annular portion provided on the outer peripheral edge of the opening 58 of the mold resin portion 56 .
  • the bracket 15 is made of a conductive metal such as a galvanized steel plate, but is not limited to this.
  • the cap 14 covers the bracket 15 from the outside and prevents water or the like from entering the bearing 12 .
  • FIG. 3 is a cross-sectional view showing the rotor 2.
  • FIG. 4 is a cross-sectional view showing an enlarged portion of the rotor 2 corresponding to one magnetic pole.
  • FIG. 5 is a diagram showing the divided rotor core 20.
  • FIG. 6 is a longitudinal sectional view showing the rotor 2.
  • the rotor 2 includes a shaft 11 that is a rotating shaft, a rotor core 20 that is spaced radially outward from the shaft 11 , and a plurality of permanent magnets 25 that are embedded in the rotor core 20 . and a resin portion 30 provided between the shaft 11 and the rotor core 20 .
  • the number of permanent magnets 25 is five here.
  • the rotor core 20 is an annular member centered on the axis Ax.
  • the rotor core 20 has an outer circumference 20a and an inner circumference 20b, and the inner circumference 20b faces the shaft 11 with a distance therebetween.
  • the rotor core 20 is formed by laminating a plurality of lamination elements in the axial direction and fixing them by caulking, welding, adhesion, or the like.
  • the lamination element is, for example, an electromagnetic steel sheet and has a plate thickness of 0.2 mm to 0.5 mm.
  • a permanent magnet 25 is inserted into each magnet insertion hole 21 .
  • the permanent magnet 25 has a flat plate shape and has a rectangular cross section in a plane perpendicular to the axial direction.
  • the permanent magnet 25 is a rare earth magnet, more specifically a neodymium magnet containing neodymium (Nd), iron (Fe) and boron (B), or a samarium magnet containing samarium (Sm) and cobalt (Co). be.
  • a ferrite magnet may be used instead of the rare earth magnet.
  • the magnet insertion hole 21 has flux barriers 22, which are air gaps, at both ends in the circumferential direction.
  • a thin portion is formed between the flux barrier 22 and the outer circumference 20 a of the rotor core 20 .
  • the thickness of the thin portion is set, for example, to be the same as the plate thickness of the lamination element in order to suppress short-circuiting of magnetic flux between adjacent permanent magnets 25 .
  • the permanent magnets 25 are arranged with the same magnetic poles directed toward the outer circumference of the rotor core 20 .
  • magnetic poles opposite to the permanent magnets 25 are formed in regions between the permanent magnets 25 adjacent in the circumferential direction.
  • the first magnetic poles P1 composed of the permanent magnets 25 and the second magnetic poles P2 composed of a region of the rotor core 20 are alternately arranged in the circumferential direction.
  • Such a configuration is called a consequent pole type.
  • the first magnetic pole P1 is assumed to be the south pole and the second magnetic pole P2 is assumed to be the north pole, but the reverse is also possible.
  • An interpolar portion M is formed between the magnetic poles P1 and P2 in the circumferential direction.
  • the center of the first magnetic pole P1 in the circumferential direction is the pole center.
  • a straight line in the radial direction passing through the pole center of the first magnetic pole P1 is defined as a magnetic pole center line N1.
  • the circumferential center of the second magnetic pole P2 is the pole center.
  • a straight line in the radial direction passing through the pole center of the second magnetic pole P2 is defined as a magnetic pole center line N2.
  • each rotor core piece 24 has an outer circumference 20a, an inner circumference 20b, and dividing surfaces 23 on both sides in the circumferential direction.
  • Each rotor core piece 24 is formed with one permanent magnet 25 .
  • the circumferential center of the rotor core piece 24 coincides with the pole center of the first magnetic pole P1.
  • the five rotor core pieces 24 are integrally held with the shaft 11 by a resin portion 30 which will be described below.
  • the rotor core pieces 24 may be provided with engaging portions 26 (FIG. 14(A)) that engage with each other, which will be described in the second embodiment.
  • a shaft 11 is provided radially inside the rotor core 20 .
  • a resin portion 30 is provided between the shaft 11 and the rotor core 20 .
  • the resin portion 30 connects the shaft 11 and the rotor core 20 and is non-magnetic.
  • the resin portion 30 is made of BMC, PBT, PPS, or PET, for example.
  • part of the resin portion 30 also enter the interior of the magnet insertion hole 21 of the rotor core 20 .
  • a part of the resin portion 30 enters the magnet insertion hole 21 , thereby suppressing displacement of the permanent magnet 25 within the magnet insertion hole 21 .
  • the shaft 11 may be fixed to the inner circumference 20 b of the rotor core 20 without providing the resin portion 30 .
  • Fixing methods include press fitting, shrink fitting, and caulking.
  • the shaft 11 is desirably made of a non-magnetic material such as austenitic stainless steel or aluminum.
  • FIG. 7 is a flow chart showing each step of the method for manufacturing the rotor 2. As shown in FIG. First, the rotor core pieces 24 are formed (step S101).
  • FIG. 8 is a plan view showing a base material substrate 200 from which laminated elements forming rotor core pieces 24 are punched.
  • the base material substrate 200 is an electromagnetic steel sheet with a thickness of 0.2 to 0.5 mm.
  • a press machine is used for punching out the base material substrate 200 .
  • a laminate element (indicated by reference numeral 201 ) forming the rotor core piece 24 is punched out from the base material substrate 200 .
  • the inner portion of the lamination element is wasted. waste, and manufacturing costs are reduced.
  • a rotor core piece 24 is formed by laminating a plurality of lamination elements 201 thus punched out in the axial direction and integrating them by caulking, welding, adhesion, or the like.
  • the permanent magnets 25 are inserted into the magnet insertion holes 21 of the rotor core pieces 24 (step S102).
  • the permanent magnet 25 is fixed in the magnet insertion hole 21 by, for example, clearance fitting.
  • each rotor core piece 24 and the shaft 11 are molded with resin (step S103).
  • resins such as PBT and PPS are used, but thermosetting resins such as BMC may also be used.
  • FIG. 9 is a longitudinal sectional view showing the molding die 9.
  • the molding die 9 has a fixed die 7 and a movable die 8 .
  • the movable mold 8 is positioned above the fixed mold 7 and is movable with respect to the fixed mold 7 .
  • the fixed mold 7 and the movable mold 8 have mold mating surfaces 75 and 85 facing each other.
  • the fixed mold 7 includes a cavity portion 71 having a hollow portion inside, a flat surface 72 formed at an axial end portion of the cavity portion 71, a shaft hole 73 into which one end portion of the shaft 11 is inserted, and a cavity portion. It has a tubular portion 74 formed between 71 and the shaft hole 73 . Further, the cavity portion 71 is formed with an abutment surface 70 that abuts on the outer peripheral portion of the end surface of the rotor core piece 24 .
  • the movable mold 8 includes a cavity portion 81 having a hollow portion inside, a flat surface 82 formed at an axial end portion of the cavity portion 81, a shaft hole 83 into which one end portion of the shaft 11 is inserted, and a cavity portion. 81 and a tubular portion 84 formed between the shaft hole 83 .
  • step S103 the shaft 11 and five rotor core pieces 24 are installed inside the cavity portion 71 of the stationary mold 7.
  • the shaft 11 is inserted into the shaft hole 73 of the stationary mold 7 .
  • the five rotor core pieces 24 are annularly arranged along the cavity portion 71 of the stationary mold 7 .
  • FIG. 10 shows a state in which five rotor core pieces 24 are annularly arranged inside the stationary mold 7 .
  • the five rotor core pieces 24 are annularly arranged so that the divided surfaces 23 are in contact with each other.
  • the outer periphery of each rotor core piece 24 contacts the inner peripheral surface 71a of the cavity portion 71 of the stationary mold 7, and the lower surface of each rotor core piece 24 contacts the contact surface 70 (FIG. 9).
  • the five rotor core pieces 24 are positioned in the circumferential, radial and axial directions inside the stationary mold 7 .
  • the stationary mold 7 may be provided with projections, pins, or the like for positioning the rotor core pieces 24 .
  • the molding die 9 is heated and molten resin is injected from a runner (not shown).
  • the resin is filled between the rotor core 20 and the shaft 11 and enters the magnet insertion holes 21 as well.
  • the resin also fills the gaps between the flat surfaces 72 and 82 and the rotor core pieces 24 and also fills the gaps between the tubular portions 74 and 84 and the shaft 11 .
  • the bearings 12 and 13 are attached to the shaft 11 of the rotor 2 and inserted into the molded stator 5 through the opening 58 .
  • the bracket 15 is attached to the opening 58 of the molded stator 5 and the cap 14 is attached to the shaft 11 .
  • the electric motor 1 is completed.
  • the rotor core 20 of the rotor 2E has the same number of magnet insertion holes 21 as the number of poles, and permanent magnets 25 are arranged in each magnet insertion hole 21 .
  • Adjacent permanent magnets 25 have magnetic pole faces with opposite polarities on the outer peripheral side. Therefore, if one permanent magnet 25 is the first magnetic pole P1, the adjacent permanent magnet 25 is the second magnetic pole P2.
  • the rotor 2F of Comparative Example 2 has half the number of permanent magnets 25 compared to the rotor 2E of Comparative Example 1, so the manufacturing cost can be significantly reduced.
  • the rotor core 20 of the rotor 2F of Comparative Example 2 does not have the split surface 23 on the second magnetic pole P2. That is, the rotor core 20 of the rotor 2F of Comparative Example 2 is not divided into rotor core pieces.
  • FIG. 12(A) and (B) are schematic diagrams showing the flow of magnetic flux emitted from the permanent magnet 25 in the rotor 2F of Comparative Example 2.
  • the first magnetic pole P1 is the south pole
  • the second magnetic pole P2 is the north pole.
  • the magnetic flux emitted from the magnetic pole surface on the inner peripheral side of the permanent magnet 25 flows toward the second magnetic pole P2.
  • stator 5A facing the rotor 2F is wound with a coil 55, and the current flowing through the coil 55 generates a stator magnetic field indicated by an arrow W in FIG. 12(B).
  • the direction of travel of the magnetic flux flowing through the second magnetic pole P2 of the rotor 2F is changed by the stator magnetic field. That is, the magnetic flux density distribution in the second magnetic pole P2 of the rotor 2F is biased to one side in the circumferential direction and is asymmetrical with respect to the magnetic pole center line N2.
  • the magnetic flux emitted from the rotor 2F interlinks with the coil 55 of the stator 5A, thereby generating an induced voltage. If the magnetic flux density distribution in the second magnetic pole P2 becomes asymmetric, there is a possibility that the harmonic components of the induced voltage will increase and vibration will occur. Also, the amount of magnetic flux interlinking with the coil 55 may decrease, the induced voltage may decrease, and the motor output may decrease.
  • the rotor core 20 is divided into two or more rotor core pieces 24 by the dividing surface 23 formed on the second magnetic pole P2. Since the dividing surface 23 has a large magnetic resistance, the magnetic flux is less likely to flow across the dividing surface 23, and the flow of the magnetic flux in the circumferential direction is suppressed. Therefore, in the second magnetic pole P2, the magnetic flux is rectified so as to flow in the radial direction.
  • the unevenness of the magnetic flux density distribution on the surface of the rotor 2 can be suppressed, thereby suppressing vibration.
  • the rotor core 20 is formed of two or more rotor core pieces 24, as described with reference to FIG. It can be punched out efficiently.
  • Embodiment 1 since the arc-shaped lamination elements 201 are punched out from the base material substrate 200, the waste of the base material substrate 200 is reduced and the yield is improved. That is, the base material substrate 200 can be effectively used, and the manufacturing cost can be reduced.
  • the magnet insertion hole 21 of the rotor core 20 is formed linearly in the direction orthogonal to the magnetic pole center line N1 here, the magnet insertion hole 21 may be formed in a V shape. Also, two or more permanent magnets 25 may be arranged in each magnet insertion hole 21 . When two or more permanent magnets 25 are arranged in each magnet insertion hole 21, the two or more permanent magnets 25 constitute one first magnetic pole P1, and each magnet insertion hole 21 is arranged in the circumferential direction. The center becomes the polar center.
  • the electric motor 1 is an IPM motor in which the permanent magnets 25 are arranged in the magnet insertion holes 21 of the rotor core 20, but it is an SPM (surface magnet type) motor in which the permanent magnets 25 are arranged on the surface of the rotor core 20.
  • the rotor 2 of Embodiment 1 includes the first magnetic poles P1 formed by the permanent magnets 25 and the second magnetic poles P1 formed between the first magnetic poles P1 adjacent to each other in the rotor core 20 in the circumferential direction. and a magnetic pole P2 of . Further, the rotor core 20 is divided into two or more rotor core pieces 24 by a dividing surface 23 formed at the center of the second magnetic pole P2 in the circumferential direction. This makes it difficult for the magnetic flux passing through the second magnetic pole P2 to change in the direction of travel.
  • the manufacturing cost of the rotor 2 can be reduced.
  • the dividing surface 23 extends in the radial direction between the inner circumference 20b and the outer circumference 20a of the rotor core 20, it is possible to effectively rectify the magnetic flux in the second magnetic pole P2 so that it flows in the radial direction. can be done. As a result, the magnetic flux density distribution in the second magnetic pole P2 can be brought closer to the magnetic flux density distribution symmetrical with respect to the magnetic pole center line N2, and the vibration suppressing effect can be enhanced.
  • Embodiment 1 since the rotor core 20 and the shaft 11 are held by the resin portion 30, the positional accuracy of the rotor core pieces 24 of the rotor core 20 can be improved. In addition, it is possible to suppress magnetic flux leakage from the rotor core 20 to the shaft 11, thereby suppressing a decrease in motor efficiency.
  • FIG. 14(A) is a cross-sectional view showing rotor 2A of the second embodiment.
  • FIG. 14B is a cross-sectional view showing an enlarged region corresponding to one magnetic pole of the rotor 2A of the second embodiment.
  • the rotor core pieces 24 of the rotor core 20 and the shaft 11 are integrally held by the resin portion 30, so the rotor core pieces 24 can be fixed more firmly.
  • FIG. 15(A) and (B) are schematic diagrams showing the flow of magnetic flux emitted from the permanent magnet 25 in the rotor 2A of the second embodiment.
  • the magnetic flux emitted from the permanent magnet 25 of the first magnetic pole P1 flows toward the second magnetic pole P2.
  • a split surface 23 is formed at the pole center of the second magnetic pole P2 of the rotor core 20. As shown in FIG.
  • the magnetic flux density distribution in the second magnetic pole P2 can be brought closer to the magnetic flux density distribution symmetrical with respect to the magnetic pole center line N2.
  • the engaging portion 26 is positioned inside the virtual circle C1 centered on the axis Ax and passing through the radial center position of the rotor core 20 .
  • the magnetic flux flowing from the permanent magnet 25 toward the second magnetic pole P2 only a small amount of magnetic flux flows in the area inside the virtual circle C1. That is, in the rotor core 20, the inside of the virtual circle C1 has a lower magnetic flux density than the outside of the virtual circle C1.
  • FIG. 16(A) is a cross-sectional view showing a rotor 2B of Embodiment 3.
  • FIG. 16B is a cross-sectional view showing an enlarged region corresponding to one magnetic pole of the rotor 2B of the third embodiment.
  • the crimped portions 27 of each rotor core piece 24 are arranged at two locations along each dividing surface 23 .
  • the crimped portion 27 on the outer peripheral side is referred to as a crimped portion 27a
  • the crimped portion 27 on the inner peripheral side is referred to as a crimped portion 27b. Both of the crimped portions 27a and 27b are formed inside the virtual circle C1.
  • the laminated elements (electromagnetic steel sheets) forming the rotor core pieces 24 can be firmly fixed.
  • the crimped portion 27 is located inside the virtual circle C1, it is possible to suppress an increase in magnetic resistance due to the magnetic flux passing through the crimped portion 27, thereby reducing the induced voltage and increasing the iron loss. can be suppressed.
  • FIG. 18(A) is a transverse cross-sectional view showing a rotor 2C of Embodiment 4.
  • FIG. 18B is a cross-sectional view showing an enlarged region corresponding to one magnetic pole of the rotor 2C of the fourth embodiment.
  • the slit portion 28 has slits 28a formed on both sides in the circumferential direction of the dividing surface 23 of the rotor core piece 24, and slits 28b formed on both sides in the circumferential direction of the slits 28a.
  • Both of the slits 28a and 28b are slots elongated in the radial direction.
  • the length of the slit 28b is longer than the length of the slit 28b, but it is not limited to this.
  • the slit portion 28 has the effect of dispersing, in the circumferential direction, the magnetic flux that tends to concentrate at the pole center of the second magnetic pole P2. Therefore, together with the effect of the dividing surface 23, the magnetic flux density distribution in the second magnetic pole P2 can be brought closer to the magnetic flux density distribution symmetrical with respect to the magnetic pole center line N2.
  • the magnetic flux density distribution in the second magnetic pole P2 is symmetrical with respect to the magnetic pole center line N2. The density distribution can be approximated, thereby suppressing vibration.
  • the second magnetic pole P2 of the rotor core 20 has the engaging portion 26 described in the second embodiment, the crimped portion 27 described in the third embodiment, and the A slit 28 as described is provided.
  • the rotation of the rotor 2 of the electric motor 1 causes the impeller 521 to rotate and blow air into the room.
  • the indoor blower 520 blows air into the room from which heat has been removed when the refrigerant evaporates in an evaporator (not shown).
  • the electric motor 1 described in each embodiment may be installed in electrical equipment other than air conditioners, such as household electrical equipment, ventilation fans, machine tools, and the like.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Permanent Field Magnets Of Synchronous Machinery (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)

Abstract

La présente invention concerne un rotor comprenant un noyau de rotor qui s'étend dans la direction circonférentielle avec un axe en tant que centre, et au moins deux aimants permanents qui sont fixés au noyau de rotor et constituent respectivement des premiers pôles. Les sections du noyau de rotor positionnées entre des premiers pôles qui sont adjacents dans la direction circonférentielle constituent des seconds pôles. Le noyau de rotor est divisé en au moins deux pièces de noyau de rotor par des surfaces de séparation formées au centre des seconds pôles dans la direction périphérique.
PCT/JP2021/009737 2021-03-11 2021-03-11 Rotor, moteur électrique, ventilateur, climatiseur et procédé de fabrication de rotor WO2022190308A1 (fr)

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PCT/JP2021/009737 WO2022190308A1 (fr) 2021-03-11 2021-03-11 Rotor, moteur électrique, ventilateur, climatiseur et procédé de fabrication de rotor
JP2023505005A JPWO2022190308A1 (fr) 2021-03-11 2021-03-11

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PCT/JP2021/009737 WO2022190308A1 (fr) 2021-03-11 2021-03-11 Rotor, moteur électrique, ventilateur, climatiseur et procédé de fabrication de rotor

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014003815A (ja) * 2012-06-19 2014-01-09 Toyota Motor Corp 回転電機の回転子鉄心
WO2017085814A1 (fr) * 2015-11-18 2017-05-26 三菱電機株式会社 Moteur électrique et conditionneur d'air
WO2019016893A1 (fr) * 2017-07-19 2019-01-24 三菱電機株式会社 Machine électrique tournante
JP2020010539A (ja) * 2018-07-10 2020-01-16 株式会社ミツバ ロータ、及びブラシレスモータ

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JP2014003815A (ja) * 2012-06-19 2014-01-09 Toyota Motor Corp 回転電機の回転子鉄心
WO2017085814A1 (fr) * 2015-11-18 2017-05-26 三菱電機株式会社 Moteur électrique et conditionneur d'air
WO2019016893A1 (fr) * 2017-07-19 2019-01-24 三菱電機株式会社 Machine électrique tournante
JP2020010539A (ja) * 2018-07-10 2020-01-16 株式会社ミツバ ロータ、及びブラシレスモータ

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