WO2021171420A1 - 回転子、電動機、送風機、空気調和装置、及び回転子の製造方法 - Google Patents

回転子、電動機、送風機、空気調和装置、及び回転子の製造方法 Download PDF

Info

Publication number
WO2021171420A1
WO2021171420A1 PCT/JP2020/007749 JP2020007749W WO2021171420A1 WO 2021171420 A1 WO2021171420 A1 WO 2021171420A1 JP 2020007749 W JP2020007749 W JP 2020007749W WO 2021171420 A1 WO2021171420 A1 WO 2021171420A1
Authority
WO
WIPO (PCT)
Prior art keywords
rotor
iron core
radial direction
gap
permanent magnet
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/JP2020/007749
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
洋樹 麻生
隆徳 渡邉
和慶 土田
貴也 下川
諒伍 ▲高▼橋
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to US17/790,037 priority Critical patent/US20230063523A1/en
Priority to CN202080096606.3A priority patent/CN115136456A/zh
Priority to PCT/JP2020/007749 priority patent/WO2021171420A1/ja
Priority to JP2022502659A priority patent/JP7234455B2/ja
Publication of WO2021171420A1 publication Critical patent/WO2021171420A1/ja
Anticipated expiration legal-status Critical
Priority to JP2023026113A priority patent/JP7486629B2/ja
Ceased legal-status Critical Current

Links

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
    • H02K1/2746—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
    • 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
    • H02K1/276—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM]
    • H02K1/2766—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM] having a flux concentration effect
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K15/00—Processes or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
    • H02K15/02—Processes or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies
    • H02K15/03—Processes or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies having permanent magnets

Definitions

  • This disclosure relates to a rotor, a motor, a blower, an air conditioner, and a method for manufacturing a rotor.
  • the salient pole formed on the rotor core functions as a virtual magnetic pole. Further, in Patent Document 1, the rotor has a slit through which the magnetic flux generated from the permanent magnet flows to the salient pole.
  • An object of the present disclosure is to facilitate transmission of torque to a rotating shaft while increasing the amount of magnetic flux flowing into a virtual magnetic pole among the magnetic fluxes emitted from a permanent magnet.
  • the rotor includes a rotation shaft, a rotor core having a first iron core portion and a second iron core portion supported by the rotation shaft and arranged adjacent to each other in the circumferential direction. It has a permanent magnet provided in the first iron core portion, a virtual magnetic pole is formed in the second iron core portion, and the first iron core portion is a rotor rather than the permanent magnet. It has a gap formed inside in the radial direction of the iron core, and the gap has a first portion in which the width in the circumferential direction widens toward the rotation axis, and is located on the innermost side in the radial direction.
  • the radial outward surface that defines the gap is located inside the radial side of the innermost portion of the second iron core in the radial direction, or the gap and the gap. There is no boundary between the rotor core and the hollow portion surrounding the rotation axis.
  • FIG. It is a block diagram which shows the partial cross section of the electric motor which concerns on Embodiment 1.
  • FIG. It is sectional drawing which cut
  • FIG. It is sectional drawing which cut
  • FIG. It is a schematic diagram which shows the flow of the magnetic flux in the rotor which concerns on Comparative Example 1.
  • FIG. 1 It is a schematic diagram which shows the flow of the magnetic flux in the rotor which concerns on Embodiment 1.
  • FIG. A graph showing the relationship between the ratio of the thickness of the portion between the magnet insertion hole and the gap (t 1 / t 0 ) to the thickness of the electromagnetic steel plate of the rotor according to the first embodiment and the noise level of the motor. be.
  • FIG. It is a schematic diagram which shows the flow of the magnetic flux in the 2nd iron core part of the rotor which concerns on Comparative Example 2.
  • FIG. It is sectional drawing which shows the structure of the rotor which concerns on Embodiment 1.
  • FIG. It is a figure which looked at the rotor shown in FIG. 10 from the + z axis side.
  • FIG. 10 is a view of the rotor shown in FIG. 10 as viewed from the ⁇ z axis side. It is a figure which shows the flow of the shaft current in the motor which concerns on Comparative Example 3 by a bidirectional arrow. It is a flowchart which shows the manufacturing process of the rotor which concerns on Embodiment 1. It is sectional drawing which shows the structure of the molding die used in the manufacturing process of the rotor which concerns on Embodiment 1. FIG. It is a top view which shows the rotor which concerns on Embodiment 2. It is a top view which shows the rotor which concerns on Embodiment 3. It is a top view which shows the rotor which concerns on Embodiment 4. FIG. It is a figure which shows the structure of the air conditioner to which the motor which has the rotor of any one of Embodiments 1 to 4 is applied. It is sectional drawing which shows the structure of the outdoor unit shown in FIG.
  • the drawing shows the xyz Cartesian coordinate system for easy understanding of the description.
  • the z-axis is a coordinate axis parallel to the axis of the rotor.
  • the x-axis is a coordinate axis orthogonal to the z-axis.
  • the y-axis is a coordinate axis orthogonal to both the x-axis and the z-axis.
  • FIG. 1 is a configuration diagram showing a partial cross section of the motor 100 according to the first embodiment.
  • the electric motor 100 has a rotor 1 and a mold stator 9 that surrounds the rotor 1.
  • the mold stator 9 has a stator 5 and a mold resin portion 56 that covers the stator 5.
  • the rotor 1 is arranged inside the stator 5. That is, the electric motor 100 is an inner rotor type electric motor.
  • the rotor 1 has a rotor core 10, a shaft 25 as a rotating shaft, and a first bearing 7 and a second bearing 8 that rotatably support the shaft 25.
  • the rotor 1 is rotatable about the axis C1 of the shaft 25.
  • the shaft 25 projects from the mold stator 9 toward the + z axis.
  • a fan of the blower that is, an impeller 504 of the outdoor blower 150 described later
  • the z-axis direction is the "axial direction”
  • the direction orthogonal to the axial direction is the “diameter direction”
  • the direction along the circumference of the circle centered on the axis C1 of the shaft 25 is the “circumferential direction” (for example).
  • Called arrow R1 shown in FIG.
  • the protruding side of the shaft 25 that is, the + z-axis side
  • the side opposite to the protruding side of the shaft 25 is also referred to as a “counterload side”.
  • the first bearing 7 and the second bearing 8 are rolling bearings, for example, ball bearings.
  • the first bearing 7 is a load-side bearing.
  • the first bearing 7 rotatably supports a portion of the shaft 25 that protrudes from the mold stator 9.
  • the second bearing 8 is a bearing on the counterload side.
  • the second bearing 8 rotatably supports the end portion 25b on the ⁇ z axis side of the shaft 25 via an insulating sleeve 60 described later.
  • the rotor 1 may further have a sensor magnet 45 as a position detection magnet.
  • the sensor magnet 45 is attached to, for example, the ⁇ z axis side of the rotor core 10 and faces the circuit board 40. By detecting the magnetic field of the sensor magnet 45 by a magnetic sensor (not shown) provided on the circuit board 40, the position of the rotor 1 in the circumferential direction R1 is detected.
  • FIG. 2 is a cross-sectional view of the rotor 1 and the mold stator 9 shown in FIG. 1 cut along the A2-A2 line.
  • the mold resin portion 56 of the mold stator 9 is not shown.
  • the stator 5 has a stator core 50 and a coil 55 wound around the stator core 50.
  • the stator core 50 has an annular yoke 51 centered on the axis C1 and a plurality of teeth 52 extending radially inward from the yoke 51.
  • the tip of the teeth 52 is radially opposed to the rotor 1 via an air gap.
  • the plurality of teeth 52 are arranged at regular intervals in the circumferential direction R1.
  • the number of teeth 52 is, for example, twelve.
  • the number of teeth 52 is not limited to 12, and may be 2 or more.
  • the coil 55 is wound around the stator core 50 via the insulator 53.
  • the insulator 53 is formed of, for example, a resin material such as PBT (Poly Butene terephlate).
  • the mold resin portion 56 has an opening portion 56a and a bearing holding portion 56b.
  • the opening 56a is formed on the + z-axis side of the mold resin portion 56.
  • a bracket 6 for holding the first bearing 7 is attached to the opening 56a.
  • the bracket 6 is, for example, a metal member.
  • the bearing holding portion 56b is formed on the ⁇ z axis side of the mold resin portion 56.
  • the second bearing 8 is held in the bearing holding portion 56b.
  • the mold resin portion 56 is formed of, for example, a thermosetting resin such as BMC (Bulk Molding Compound) resin.
  • the circuit board 40 is embedded inside the mold resin portion 56.
  • the circuit board 40 is arranged inside the mold resin portion 56 on the ⁇ z axis side of the rotor 1.
  • a power supply lead wire or the like for supplying electric power to the coil 55 is wired on the circuit board 40.
  • the motor 100 may further have a cap 41.
  • the cap 41 is fixed to the shaft 25 so as to cover a part of the bracket 6.
  • the cap 41 is a member that prevents foreign matter (for example, water) from entering the inside of the electric motor 100.
  • FIG. 3 is a side view showing a part of the rotor 1.
  • FIG. 4 is a cross-sectional view of the rotor 1 shown in FIG. 3 cut along the A4-A4 line.
  • the rotor core 10 of the rotor 1 is an annular member centered on the axis C1.
  • the hollow portion 10c of the rotor core 10 is an insertion hole into which the shaft 25 is inserted. That is, the hollow portion 10c surrounds the shaft 25.
  • the rotor core 10 has a plurality of electromagnetic steel sheets 18 laminated in the axial direction.
  • the plate thickness t 0 (see FIG. 3) of one of the plurality of electromagnetic steel sheets 18 is, for example, 0.1 mm to 0.5 mm.
  • Each of the plurality of electrical steel sheets 18 is processed into a predetermined shape by punching using a press die.
  • the plurality of electromagnetic steel sheets 18 are fixed to each other by welding, caulking, adhesion, or the like. In the first embodiment, the plurality of electrical steel sheets 18 are fixed to each other by caulking.
  • the rotor core 10 is provided with a permanent magnet 20.
  • the permanent magnet 20 is embedded in the rotor core 10. That is, the rotor 1 has an IPM (Interior Permanent Magnet) structure.
  • the rotor 1 may have an SPM (Surface Permanent Magnet) structure in which a permanent magnet 20 is attached to the outer periphery of the rotor core 10.
  • the rotor 1 may further have a connecting portion 30 that connects the rotor core 10 and the shaft 25. That is, in the first embodiment, the rotor core 10 is supported by the shaft 25 via the connecting portion 30.
  • the connecting portion 30 is formed of a resin material having an electrically insulating property.
  • the connecting portion 30 is formed of, for example, a thermoplastic resin such as PBT.
  • the rotor core 10, the shaft 25, and the insulating sleeve 60 described later are integrated via a resin connecting portion 30. In the following description, integrating the rotor core 10, the shaft 25, and the insulating sleeve 60 to which the permanent magnet 20 is attached with resin is referred to as "integral molding".
  • the connecting portion 30 has an inner cylinder portion 31, a plurality of ribs 32, and an outer cylinder portion 33.
  • the inner cylinder portion 31 has an annular shape and is in contact with the outer peripheral surface of the shaft 25.
  • the outer cylinder portion 33 is in contact with the inner peripheral surface of the rotor core 10.
  • the plurality of ribs 32 connect the inner cylinder portion 31 and the outer cylinder portion 33.
  • the plurality of ribs 32 extend radially outward from the inner cylinder portion 31.
  • the plurality of ribs 32 are arranged at equal intervals in the circumferential direction R1 with the axis C1 as the center.
  • a cavity 35 penetrating in the axial direction is formed between the plurality of ribs 32 adjacent to each other in the circumferential direction R1.
  • FIG. 5 is a plan view showing the rotor core 10 and the permanent magnet 20 of the rotor 1.
  • the rotor core 10 has a first iron core portion 21 to which the permanent magnet 20 is attached and a second iron core portion 22 to which the permanent magnet 20 is not attached. ..
  • the rotor core 10 has a plurality of (for example, five) first iron core portions 21 and a plurality of (for example, five) second iron core portions 22.
  • the plurality of first iron core portions 21 and the plurality of second iron core portions 22 are alternately arranged in the circumferential direction R1. That is, the first iron core portion 21 and the second iron core portion 22 are arranged adjacent to each other in the circumferential direction R1.
  • the first iron core portion 21 has a magnet insertion hole 11 as a magnet insertion portion.
  • the magnet insertion hole 11 is formed radially inside the outer circumference 21b of the first iron core portion 21.
  • the shape of the magnet insertion hole 11 is, for example, linear in a plan view.
  • one permanent magnet 20 is inserted into one magnet insertion hole 11.
  • a resin material for example, PBT
  • the shape of the magnet insertion hole 11 may be a V shape having a convex shape in the radial direction or a convex shape in the radial direction in a plan view.
  • two or more permanent magnets 20 may be inserted into one magnet insertion hole 11.
  • the permanent magnet 20 is, for example, a rare earth magnet.
  • the permanent magnet 20 is a neodymium rare earth magnet containing, for example, Nd (neodymium) -Fe (iron) -B (boron).
  • the permanent magnet 20 is, for example, plate-shaped.
  • the permanent magnet 20 has a flat plate shape.
  • the permanent magnet 20 has a rectangular shape in a plan view.
  • the plurality of permanent magnets 20 have magnetic poles (for example, N poles) having the same polarity as each other on the outer side in the radial direction.
  • the rotor 1 is formed with a magnet magnetic pole P1 composed of a permanent magnet 20.
  • the plurality of permanent magnets 20 have magnetic poles (for example, S poles) having the same polarity inside each other in the radial direction.
  • a virtual magnetic pole P2 (for example, an S pole) is formed on the radial outer side of the second iron core portion 22 by the magnetic flux generated from the radial inside of the permanent magnet 20 flowing into the second iron core portion 22. Therefore, the plurality of second iron core portions 22 form virtual magnetic poles P2 having the same polarity on the outer side in the radial direction.
  • the rotor 1 is a concave pole type rotor in which magnet magnetic poles P1 and virtual magnetic poles P2 are alternately arranged in the circumferential direction R1.
  • the number of permanent magnets 20 can be halved as compared with the non-consequent pole type rotor 1 having the same number of poles. As a result, the manufacturing cost of the rotor 1 is reduced.
  • the number of poles of the rotor 1 is 10, but the number of poles is not limited to 10, and any number of 4 or more may be used.
  • the magnet magnetic pole P1 may be the S pole and the virtual magnetic pole P2 may be the N pole.
  • a straight line extending in the radial direction through the center (that is, the pole center) of the magnetic pole P1 in the circumferential direction R1 is referred to as a "magnet magnetic pole center line M1".
  • the magnet magnetic pole center line M1 is a straight line extending in the radial direction through the center of the permanent magnet 20 in the circumferential direction R1.
  • a straight line extending in the radial direction through the center (that is, the pole center) of the virtual magnetic pole P2 in the circumferential direction R1 is referred to as a "virtual magnetic pole center line M2".
  • the first iron core portion 21 further has a plurality of flux barriers 12 as leakage flux suppression holes.
  • the flux barrier 12 is formed on both sides of the magnet insertion hole 11 in the circumferential direction R1. Since the portion 21c between the flux barrier 12 and the outer circumference 21b of the first iron core portion 21 is thin, the leakage flux between the adjacent magnet magnetic poles P1 and the virtual magnetic poles P2 is suppressed.
  • the second iron core portion 22 has a caulking portion 14.
  • the caulking portion 14 is a caulking mark formed when a plurality of electromagnetic steel sheets 18 (see FIG. 3) laminated in the axial direction are fixed by caulking.
  • the caulking portion 14 is formed inside the second iron core portion 22 in the radial direction.
  • the shape of the crimped portion 14 when viewed in the axial direction is, for example, a circular shape.
  • the shape of the crimped portion 14 is not limited to a circular shape, and may be another shape such as a rectangular shape.
  • a gap portion 15 is formed radially inside the permanent magnet 20 (that is, the magnet insertion hole 11).
  • the gap portion 15 is an opening that penetrates a plurality of laminated electromagnetic steel sheets 18 (see FIG. 3) in the axial direction.
  • the gap portion 15 has a first portion 15a and a second portion 15b connected to the first portion 15a.
  • the width of the circumferential direction R1 in the first portion 15a becomes wider toward the inner side in the radial direction.
  • the width of the first portion 15a increases in the circumferential direction R1 toward the shaft 25 shown in FIG.
  • the shape of the first portion 15a when viewed in the axial direction is, for example, a semicircle.
  • the width of the second portion 15b in the circumferential direction R1 becomes narrower toward the inner side in the radial direction.
  • the shape of the second portion 15b when viewed in the axial direction is, for example, a semicircle. That is, in the first embodiment, the shape of the gap portion 15 when viewed in the axial direction is circular.
  • the shape of the gap portion 15 is not limited to a circular shape, and may be another shape such as an elliptical shape.
  • the radial outward surface 15d located on the innermost side of the gap portion 15 in the radial direction is located radially inward from the radial inner end portion 22a of the second iron core portion 22.
  • the radial outward facing surface 15d is one of a plurality of surfaces that define the gap portion 15.
  • the radial inner end portion 22a of the second iron core portion 22 is the innermost portion in the radial direction of the second iron core portion 22.
  • the radial inner end portion 22a of the second iron core portion 22 is the inner peripheral surface of the second iron core portion 22.
  • the gap portion 15 is arranged at a position overlapping the magnet magnetic pole center line M1.
  • the gap portion 15 has a symmetrical shape with respect to the magnet magnetic pole center line M1.
  • a plurality of gaps 15 are formed in the rotor core 10.
  • the plurality of gaps 15 are arranged at equal intervals in the circumferential direction.
  • FIG. 6 is a schematic view showing the flow of the magnetic flux F in the rotor 1A of the motor 100A according to Comparative Example 1.
  • FIG. 7 is a schematic view showing the flow of the magnetic flux F in the rotor 1 according to the first embodiment. As shown in FIGS. 6 and 7, the rotor 1A according to Comparative Example 1 is different from the rotor 1 according to the first embodiment in that it does not have a gap portion 15. In FIG. 6 and FIG.
  • reference numerals 52a, 52b, 52c, 52d, and 52e are attached to a plurality of teeth extending radially inward from the yoke 51 of the stator core 50, and reference numerals are given to the plurality of virtual magnetic poles. P2a and P2b are attached.
  • the magnetic flux F emitted from the radial inside of the permanent magnet 20 flows through the first iron core portion 21 and the second iron core portion 22 to the virtual magnetic poles P2a and P2b.
  • the gap portion (the portion corresponding to the gap portion 15 shown in FIG. 7) was not formed in the first iron core portion 21, the permanent magnet 20 came out from the inside in the radial direction.
  • the distance that the magnetic flux F travels in the first iron core portion 21 in the radial direction is long. Therefore, in Comparative Example 1, the magnetic flux F emitted from the radial inside of the permanent magnet 20 easily flows into the second iron core portion 22 in a gentle arc.
  • Comparative Example 1 among the magnetic flux F emitted from the radial inside of the permanent magnet 20, the amount of magnetic flux F flowing into the second iron core portion 22 is reduced, and the magnetic flux F of the magnetic flux F in the second iron core portion 22 is reduced. The density decreases.
  • the distance that the magnetic flux F emitted from the radial inside of the permanent magnet 20 travels in the radial direction through the first iron core portion 21 is shorter than that in Comparative Example 1. This is because, in the first embodiment, the magnetic flux F emitted from the radial inside of the permanent magnet 20 flows in the first iron core portion 21 along the gap portion 15. Specifically, since the gap portion 15 has the first portion 15a in which the width of the circumferential direction R1 widens toward the shaft 25, the magnetic flux F emitted from the radial inside of the permanent magnet 20 is the first. It flows in the iron core portion 21 along the first portion 15a.
  • the magnetic flux F emitted from the radial inside of the permanent magnet 20 is forcibly guided to the second iron core portion 22. That is, the flow of the magnetic flux F is rectified by the gap portion 15. Therefore, in the first embodiment, among the magnetic flux F emitted from the radial inside of the permanent magnet 20, the amount of magnetic flux F flowing into the second iron core portion 22 increases, and the magnetic flux F in the second iron core portion 22 increases. The magnetic flux density increases.
  • the radial outward surface 15d of the gap portion 15 is located radially inside the second iron core portion 22 with respect to the radial inner end portion 22a. Therefore, the length Lr from the radial inward surface 15c of the gap portion 15 to the radial outward surface 15d, that is, the radial length of the gap portion 15 that guides the magnetic flux F can be increased. ..
  • the inner peripheral surface 17 of the rotor core 10 (See FIG. 5) has an uneven shape. Therefore, as will be described later, since the rotor core 10 and the resin connecting portion 30 are unevenly fitted, torque is easily transmitted from the rotor core 10 to the shaft 25 via the connecting portion 30.
  • Comparative Example 1 shown in FIG. 6 a case where the facing area between the pole center of the virtual magnetic pole P2a and the teeth 52a is larger than the facing area between the pole center of the virtual magnetic pole P2b and the teeth 52d is illustrated. There is. At this time, the magnetic flux F is more likely to flow to the second iron core portion 22 forming the virtual magnetic pole P2a than to the second iron core portion 22 forming the virtual magnetic pole P2b. That is, in the rotor 1A according to Comparative Example 1, the amount of magnetic flux varies between the virtual magnetic poles P2a and P2b. When such a variation in the amount of magnetic flux occurs, vibration and noise are likely to occur because there is a large difference in surface magnetic flux density between the adjacent magnet magnetic poles P1 and virtual magnetic poles P2 in the circumferential direction.
  • the gap portion 15 which is arranged at a position overlapping the magnet magnetic flux center line M1 (see FIG. 5) and has a symmetrical shape with respect to the magnet magnetic flux center line M1 is provided. Therefore, the magnetic flux F emitted from the radial inside of the permanent magnet 20 easily flows evenly into the second iron core portions 22 located on both sides of the circumferential direction R1 with reference to the permanent magnet 20. Therefore, in the first embodiment, the amount of magnetic flux is less likely to vary between the virtual magnetic poles P2a and P2b.
  • the thickness of the portion (hereinafter, also referred to as “bridge portion”) 16 between the gap portion 15 and the magnet insertion hole 11 and the noise generated by the rotating motor 100 are determined.
  • the relationship will be explained.
  • the thickness t 1 of the bridge portion 16 is assigned a reference numeral t 1, and the ratio t 1 / t 0 of the thickness t 1 of the bridge portion 16 to the plate thickness t 0 of one electromagnetic steel sheet 18 is used.
  • FIG. 8 is a graph showing the relationship S1 between the ratio t 1 / t 0 and the noise level of the motor 100.
  • the horizontal axis represents the ratio t 1 / t 0
  • the vertical axis represents the detected value of the noise level [dBA] of the motor 100.
  • the noise level of the motor 100 gradually increases, but the noise level of the motor 100 is 2 dBA or less.
  • the noise level of the motor 100 increases sharply. That is, if the upper limit of the ratio t 1 / t 0 is 3 or less, the noise level of the motor 100 can be included in the allowable range.
  • the rotor 1 has a plurality of electrical steel sheets 18 (see FIG. 3) laminated in the axial direction, but each of the electrical steel sheets 18 has a magnet insertion hole 11 and a gap.
  • the portion 15 is preformed by punching.
  • the thickness t 1 of the bridge portion 16 is, for example, one electromagnetic steel plate 18. It is necessary that the plate thickness is 0.5 times or more of t 0. That is, in general , if the lower limit of the ratio t 1 / t 0 is 0.5 or more, the bridge portion 16 can be formed by punching.
  • the ratio t 1 / t 0 of the thickness t 1 of the bridge portion 16 to the plate thickness t 0 of one electromagnetic steel sheet 18 satisfies the following formula (1). 0.5 ⁇ t 1 / t 0 ⁇ 3 (1)
  • the first iron core portion 21 further has a protruding portion 21a inward in the radial direction.
  • the shape of the protruding portion 21a when viewed in the axial direction is an arc shape.
  • the protruding portion 21a protrudes radially inward from the radial inner end portion 22a of the second iron core portion 22.
  • the radial inner end 22a of the second iron core 22 is a recess located radially outer of the protruding portion 21a. That is, the inner peripheral surface 17 of the rotor core 10 is formed in a concavo-convex shape by the protruding portion 21a and the radial inner end portion 22a.
  • the radial inner end 22a of the second iron core 22 is a recess, a portion of the second iron core 22 that is unnecessary for the flow of the magnetic flux F is deleted, so that the rotor 1 can be made lighter while being lightweight. The manufacturing cost of the rotor 1 can be reduced.
  • the outer cylinder portion 33 of the connecting portion 30 in contact with the inner peripheral surface 17 of the rotor core 10 is formed in a recess 33a fitted in the protruding portion 21a and a radial inner end portion 22a. It has a convex portion 33b to be fitted. As a result, torque is easily transmitted from the rotor core 10 to the shaft 25 via the connecting portion 30.
  • the second iron core portion 22 has, for example, two first slits 13a and two second slits 13b.
  • the first slit 13a and the second slit 13b penetrate the laminated electromagnetic steel sheets 18 (see FIG. 3) in the axial direction.
  • the plurality of first slits 13a are arranged on both sides of the virtual magnetic pole center line M2 in the circumferential direction R1.
  • the plurality of first slits 13a are arranged symmetrically with respect to the virtual magnetic pole center line M2.
  • the plurality of second slits 13b are arranged on both sides of the plurality of first slits 13a in the circumferential direction R1.
  • the plurality of second slits 13b are arranged symmetrically with respect to the virtual magnetic pole center line M2.
  • the first slit 13a and the second slit 13b are collectively referred to as "slit 13". ..
  • the slit 13 is located radially outside the crimped portion 14.
  • the slit 13 has a shape that is long in the radial direction. That is, in the slit 13, the length in the radial direction is longer than the width in the circumferential direction R1.
  • the slit 13 is not limited to a shape that is long in the radial direction, and may have another shape such as a circular shape.
  • each of the slits 13 is filled with a resin material (for example, PBT) (not shown).
  • the slit 13 may not be filled with a resin material.
  • the second iron core portion 22 may have one or more slits 13.
  • FIG. 9 is a schematic view showing the flow of the magnetic flux F in the second iron core portion 22B of the rotor 1B according to Comparative Example 2.
  • the rotor 1B according to Comparative Example 2 is different from the rotor 1 according to the first embodiment in that a slit 13 is not formed in the second iron core portion 22B.
  • the magnetic flux F tilts toward the teeth 52 facing the virtual magnetic pole P2 as it travels from the inside to the outside in the radial direction.
  • the amount of magnetic flux F flowing in the polar center of the virtual magnetic pole P2 is reduced.
  • FIG. 10 is a cross-sectional view showing the configuration of the rotor 1.
  • FIG. 11 is a plan view of the rotor 1 shown in FIG. 10 as viewed from the + z-axis side.
  • FIG. 12 is a plan view of the rotor 1 shown in FIG. 10 as viewed from the ⁇ z axis side.
  • the connecting portion 30 of the rotor 1 includes a first end face portion 38 that covers the end face of the rotor core 10 on the + z axis side and an end face of the rotor core 10 on the ⁇ z axis side.
  • the first end face portion 38 and the second end face portion 39 are connected to the inner cylinder portion 31, the rib 32, and the outer cylinder portion 33 shown in FIG.
  • the first end face portion 38 and the second end face portion 39 do not have to cover the entire end face of the rotor core 10, and may cover at least a part of the end face of the rotor core 10.
  • the first end face portion 38 has an opening 36 for exposing the gap portion 15 and a magnet exposed hole 37 for exposing a part of the permanent magnet 20.
  • the second end face portion 39 has an opening 39a that exposes the end face 10b of the rotor core 10 on the ⁇ z axis side.
  • the rotor 1 may further have an insulating sleeve 60 as an insulating member.
  • the insulating sleeve 60 is arranged between the end portion 25b of the shaft 25 on the ⁇ z axis side and the second bearing 8.
  • the insulating sleeve 60 is, for example, substantially cylindrical.
  • the insulating sleeve 60 is made of, for example, a thermosetting resin. In the first embodiment, the insulating sleeve 60 is made of BMC resin.
  • FIG. 13 is a diagram showing the flow of the axial current inside the motor 100C according to Comparative Example 3 with arrows in both directions.
  • the rotor 1C of the motor 100C according to Comparative Example 3 is related to the first embodiment in that it has a rotor core 10C directly fixed to the shaft 25 and does not have an insulating sleeve 60. Different from rotor 1.
  • a connecting portion 30 formed of an electrically insulating resin material is arranged between the shaft 25 and the rotor core 10.
  • an insulating sleeve 60 as an insulating member is arranged between the end portion 25b of the shaft 25 and the second bearing 8.
  • the shaft current is prevented from flowing between the shaft 25 and the second bearing 8, so that the shaft current is prevented from flowing through the second bearing 8.
  • the shaft current is prevented from flowing to the first bearing 7. Therefore, electrolytic corrosion is prevented from occurring in the first bearing 7 and the second bearing 8.
  • the insulating sleeve 60 may be arranged between the shaft 25 and the first bearing 7, or between the shaft 25 and the first bearing 7 and between the shaft 25 and the second bearing 8. It may be arranged in both of.
  • the rotor 1 is manufactured by integrally molding a rotor core 10 to which a permanent magnet 20 is attached, a shaft 25, and an insulating sleeve 60.
  • FIG. 14 is a flowchart showing a manufacturing method of the rotor 1.
  • the rotor core 10 is formed.
  • Rotor iron core 10 A rotor core 10 having a first iron core portion 21 including the above-mentioned gap portion 15 and a second iron core portion 22 is formed.
  • a plurality of electromagnetic steel sheets 18 (see FIG. 3) having a first iron core portion 21 including a gap portion 15 and a second iron core portion 22 are laminated in the axial direction and fixed by caulking or the like.
  • the rotor core 10 is formed.
  • step ST2 the permanent magnet 20 is inserted into the magnet insertion hole 11 of the first iron core portion 21, so that the permanent magnet 20 is attached to the rotor core 10.
  • step ST3 the rotor core 10 to which the permanent magnet 20 is attached, the shaft 25, and the insulating sleeve 60 are mounted on the molding die 70 (see FIG. 15 described later), and the resin is injected into the molding die 70.
  • the rotor core 10, the shaft 25, and the insulating sleeve 60 to which the permanent magnet 20 is attached are integrally molded.
  • the shaft 25 and the insulating sleeve 60 are prepared in advance before step ST1.
  • FIG. 15 is a cross-sectional view showing the configuration of the molding die 70 used in step ST3 of the manufacturing process of the rotor 1 shown in FIG.
  • the molding die 70 has a fixed die (that is, an upper die) 80 and a movable die (that is, a lower die) 90.
  • the fixed mold 80 has an insertion hole 81, a facing portion 82, a cylindrical portion 83, a plurality of cavity forming portions 85a and 85b, and an iron core holding portion 86.
  • the end 25b on the ⁇ z axis side of the shaft 25 to which the insulating sleeve 60 is attached is inserted into the insertion hole 81.
  • the facing portion 82 comes into contact with the end surface 10b of the rotor core 10 on the ⁇ z axis side.
  • the cylindrical portion 83 faces the outer circumference of the insulating sleeve 60.
  • the plurality of cavity forming portions 85a and 85b are inserted into the hollow portions 10c of the rotor core 10.
  • the iron core holding portion 86 projects from the facing portion 82 toward the movable mold 90 side and comes into contact with the end surface 10b of the rotor core 10 on the ⁇ z axis side.
  • a gap is formed between the end surface 10b of the rotor core 10 and the facing portion 82.
  • the movable mold 90 has a shaft insertion hole 91, a facing portion 92, a cylindrical portion 93, an iron core insertion portion 94, and a plurality of cavity forming portions 95a and 95b.
  • the shaft 25 is inserted into the shaft insertion hole 91.
  • the facing portion 92 comes into contact with the end surface 10a of the rotor core 10 on the + z axis side.
  • the cylindrical portion 93 faces the outer circumference of the shaft 25.
  • the outer circumference of the rotor core 10 comes into contact with the iron core insertion portion 94.
  • the plurality of cavity forming portions 95a and 95b are inserted into the hollow portions 10c of the rotor core 10.
  • the fixed mold 80 further has an iron core positioning portion 96 and a magnet receiving portion 97.
  • the iron core positioning portion 96 and the magnet receiving portion 97 project from the facing portion 92 toward the fixed mold 80 side.
  • the iron core positioning portion 96 functions as a positioning portion of the rotor core 10 at the time of integral molding by being inserted into the gap portion 15 of the rotor core 10.
  • the magnet receiving portion 97 functions as a positioning portion of the permanent magnet 20 at the time of integral molding by abutting on the end face of the permanent magnet 20 on the + z axis side.
  • the resin is also filled in the gap between the end face 10b of the rotor core 10 and the facing portion 82, and between the end face 10a of the rotor core 10 and the facing portion 92.
  • the resin is also filled between the magnet insertion hole 11 (see FIG. 5) and the permanent magnet 20 and also in the slit 13 (see FIG. 5) of the second iron core portion 22.
  • the molding die 70 After the resin is injected into the molding die 70, the molding die 70 is cooled. As a result, the resin is cured and the connecting portion 30 is formed. Specifically, the resin cured between the insulating sleeve 60 and the cylindrical portion 83 and between the shaft 25 and the cylindrical portion 93 becomes the inner cylinder portion 31 (see FIG. 10). The resin cured in the hollow portion 10c (where the cavity forming portions 85a, 85b, 95a, 95b are not inserted) inside the rotor core 10 in the radial direction is the inner cylinder portion 31, the plurality of ribs 32, and the outer cylinder. It becomes a part 33 (see FIG. 4).
  • the portions corresponding to the cavity forming portions 85a, 85b, 95a, 95b of the molding die 70 are the cavity portions 35 (see FIG. 4). Further, the resin cured between the end face 10a of the rotor core 10 and the facing portion 92 becomes the first end face portion 38 (see FIG. 10 or 11), and the end face 10b of the rotor core 10 and the facing portion 82 are formed. The resin cured between them becomes the second end face portion 39 (see FIG. 10 or 12).
  • the movable mold 90 is lowered and the rotor 1 is taken out from the fixed mold 80. As a result, the production of the rotor 1 is completed.
  • the gap portion 15 of the first iron core portion 21 has a first portion 15a in which the width of the circumferential direction R1 widens toward the inside in the radial direction.
  • the magnetic flux F emitted from the radial inside of the permanent magnet 20 flows in the first iron core portion 21 along the first portion 15a and is forcibly guided to the second iron core portion 22.
  • the radial outward surface 15d of the gap portion 15 is located radially inside the second iron core portion 22 in the radial direction, the diameter of the gap portion 15 that guides the magnetic flux F. The length in the direction can be increased.
  • the magnetic flux F emitted from the radial inside of the permanent magnet 20 is more easily guided to the second iron core portion 22. Therefore, according to the first embodiment, among the magnetic flux F emitted from the permanent magnet 20, the amount of magnetic flux F flowing into the second iron core portion 22 increases. By increasing the amount of magnetic flux F flowing into the second iron core portion 22, the variation in the surface magnetic flux density between the magnet magnetic pole P1 and the virtual magnetic pole P2 is reduced, so that the vibration and noise of the motor 100 can be reduced. Can be done.
  • the radial outward surface 15d located at the innermost radial direction in the gap portion 15 is located radially inner side of the radial inner end portion 22a of the second iron core portion 22. Therefore, the inner peripheral surface 17 of the rotor core 10 can have an uneven shape. As a result, the rotor core 10 and the connecting portion 30 are unevenly fitted, so that torque is easily transmitted from the rotor core 10 to the shaft 25 via the connecting portion 30. In particular, even when a neodymium rare earth magnet having a strong magnetic force is used for the permanent magnet 20, torque is easily transmitted to the shaft 25.
  • the first iron core portion 21 has a protruding portion 21a that fits with the recess 33a of the connecting portion 30.
  • the protruding portion 21a can function as a torque transmitting portion for transmitting torque to the shaft 25 via the connecting portion 30, and the torque of the rotor 1 can be easily transmitted to the shaft 25 via the connecting portion 30. ..
  • the gap portion 15 has a second portion 15b in which the width of the circumferential direction R1 becomes narrower toward the inner side in the radial direction.
  • the shape of the first iron core portion 21 inside in the radial direction can be reduced. Therefore, since the weight of the rotor core 10 is reduced, the cost of the rotor 1 can be reduced while reducing the weight of the rotor 1.
  • the gap portion 15 when viewed in the axial direction is circular, the gap portion 15 can be easily formed in the electromagnetic steel sheet 18 by punching using a press die. Can be formed.
  • the ratio t 1 / t 0 of the thickness t 1 of the bridge portion 16 to the plate thickness t 0 of one electromagnetic steel sheet 18 is 0.5 ⁇ t 1 / t 0 ⁇ 3. Fulfill. This makes it possible to form the bridge portion 16 by punching, and the noise level of the motor 100 can be included in the allowable range.
  • the ratio t 1 / t 0 satisfies 0.5 ⁇ t 1 / t 0 ⁇ 2. This makes it possible to form the bridge portion 16 by punching, and the noise level of the motor 100 can be included in the allowable range.
  • the second iron core portion 22 has a slit 13. As a result, the direction of the magnetic flux F flowing in the second iron core portion 22 can be rectified in a direction parallel to the radial direction.
  • the slit 13 is filled with the resin material, the strength of the rotor 1 is increased, and the deformation of the rotor 1 during rotation can be prevented.
  • the iron core positioning portion 96 of the movable mold 90 is inserted into the gap portion 15 at the time of integral molding. That is, since the gap portion 15 is used to prevent the position shift of the rotor core 10 during integral molding, it is not necessary to form another hole in the rotor core 10 into which the iron core positioning portion 96 is inserted. As a result, the manufacturing cost of the rotor 1 can be reduced while ensuring the strength of the rotor 1 satisfactorily.
  • the magnet receiving portion 97 of the movable mold 90 is in contact with the permanent magnet 20 at the time of integral molding. This makes it possible to prevent the permanent magnet 20 from being displaced during integral molding.
  • a resin material is filled between the magnet insertion hole 11 and the permanent magnet 20. As a result, it is possible to prevent the permanent magnet 20 from being displaced in the magnet insertion hole 11 during rotation.
  • the connecting portion 30 is formed of a resin material having an electrically insulating property.
  • the rotor core 10 and the shaft 25 can be electrically insulated from each other, and the axial current is prevented from flowing to the first bearing 7 and the second bearing 8. Therefore, it is possible to prevent electrolytic corrosion from occurring in the first bearing 7 and the second bearing 8.
  • the insulating sleeve 60 is arranged between the end portion 25b on the ⁇ z axis side of the shaft 25 and the second bearing 8.
  • the shaft 25 and the second bearing 8 can be electrically insulated from each other, and the axial current is prevented from flowing to the first bearing 7 and the second bearing 8. Therefore, it is possible to prevent electrolytic corrosion from occurring in the first bearing 7 and the second bearing 8.
  • the insulating sleeve 60 is made of BMC resin. As a result, the dimensional accuracy of the insulating sleeve 60 can be ensured satisfactorily, and the manufacturing cost of the insulating sleeve 60 is reduced.
  • FIG. 16 is a plan view showing the rotor core 210 and the permanent magnet 20 of the rotor 2 according to the second embodiment.
  • components that are the same as or correspond to the components shown in FIG. 5 are designated by the same reference numerals as those shown in FIG.
  • the rotor 2 is different from the rotor 1 according to the first embodiment in that the shape of the gap portion 215 and the configuration of the slit 213 are different.
  • the rotor core 210 of the rotor 2 has a first iron core portion 221 and a second iron core portion 222 arranged adjacent to each other in the circumferential direction R1. doing.
  • the first iron core portion 221 has a gap portion 215 formed radially inside the permanent magnet 20.
  • the gap portion 215 has a first portion 215a in which the width of the circumferential direction R1 widens from the outer side in the radial direction to the inner side, and a second portion 215b connected to the first portion 215a.
  • the shape of the first portion 215a when viewed in the axial direction is a substantially trapezoidal shape.
  • the radial innermost position 215e of the first portion 215a is located radially inside the caulking portion 14 of the second iron core portion 222.
  • the second iron core portion 222 has one slit 213 formed radially outside the caulking portion 14.
  • the shape of the slit 213 when viewed in the axial direction is, for example, a square shape.
  • the shape of the slit 213 is not limited to a square shape, and may be another shape such as a rectangular shape. Further, the number of slits 213 is not limited to one, and may be plural.
  • the gap portion 215 has a substantially trapezoidal first portion 215a in which the width of the circumferential direction R1 widens toward the inside in the radial direction.
  • the magnetic flux emitted from the radial inside of the permanent magnet 20 flows in the first iron core portion 221 along the first portion 215a and is forcibly guided to the second iron core portion 222. Therefore, among the magnetic fluxes emitted from the radial inside of the permanent magnet 20, the amount of magnetic flux flowing into the second iron core portion 222 increases.
  • the innermost position 215c in the radial direction of the first portion 215a of the gap portion 215 is larger than the innermost position in the radial direction of the caulking portion 14 of the second iron core portion 222. It is located inward in the radial direction and has a long radial length of the first portion 215a. As a result, the distance that the magnetic flux travels along the first portion 215a becomes longer, so that the magnetic flux emitted from the radial inside of the permanent magnet 20 is more easily guided to the second iron core portion 222. As a result, the amount of magnetic flux of the magnetic flux flowing into the second iron core portion 222 can be further increased.
  • the second iron core portion 222 has a slit 213.
  • the direction of the magnetic flux F flowing in the second iron core portion 222 can be rectified in a direction parallel to the radial direction.
  • the second embodiment is the same as the first embodiment.
  • FIG. 17 is a plan view showing the rotor core 310 and the permanent magnet 20 of the rotor 3 according to the third embodiment.
  • the same or corresponding components as those shown in FIG. 5 or 16 are designated by the same reference numerals as those shown in FIG. 5 or 16.
  • the rotor 3 is different from the rotors 1 and 2 of any one of the first and second embodiments in that the shape of the gap portion 315 is formed.
  • the rotor core 310 of the rotor 3 according to the third embodiment has a first iron core portion 321 and a second iron core portion 222 arranged adjacent to the circumferential direction R1. doing.
  • the first iron core portion 321 has a gap portion 315 formed radially inside the permanent magnet 20.
  • the gap 315 is connected to the magnet insertion hole 11.
  • the radial outer portion of the gap 315 is connected to the radial inner portion of the magnet insertion hole 11. That is, in the rotor core 310 of the third embodiment, the portion corresponding to the bridge portion 16 (see FIG. 5) of the first embodiment is not formed between the magnet insertion hole 11 and the gap portion 315.
  • the gap portion 315 has a first portion 315a in which the width of the circumferential direction R1 widens from the outer side in the radial direction to the inner side in the radial direction.
  • the gap portion 315 does not have a portion corresponding to the second portions 15b and 215b of the gap portions 15 and 215 in the rotors 1 and 2 of either the first or second embodiment.
  • the gap portion 315 has a first portion 315a in which the width of the circumferential direction R1 widens toward the inner side in the radial direction.
  • the magnetic flux emitted from the radial inside of the permanent magnet 20 flows in the first iron core portion 321 along the first portion 315a and is forcibly guided to the second iron core portion 222. Therefore, among the magnetic fluxes emitted from the radial inside of the permanent magnet 20, the amount of magnetic flux flowing into the second iron core portion 222 increases.
  • the magnetic flux emitted from the radial inside of the permanent magnet 20 is more likely to travel along the gap portion 315 in the first iron core portion 321.
  • the magnetic flux emitted from the radial inside of the permanent magnet 20 is more likely to flow into the second iron core portion 222 along the gap portion 315, so that the amount of magnetic flux of the magnetic flux flowing into the second iron core portion 222 is further increased. Can be made to.
  • the gap portion 315 is connected to the magnet insertion hole 11
  • the gap portion 315 and the magnet insertion hole 11 can be formed at the same time in the process of forming the rotor core 10. , The processing process of the rotor 3 is simplified.
  • the third embodiment is the same as either the first or the second embodiment.
  • FIG. 18 is a plan view showing the rotor core 410 and the permanent magnet 20 of the rotor 4 according to the fourth embodiment.
  • components that are the same as or correspond to the components shown in FIG. 5 are designated by the same reference numerals as those shown in FIG.
  • the rotor 4 is different from the rotor 1 according to the first embodiment in that the shape of the gap portion 415 is formed.
  • the rotor core 410 of the rotor 4 according to the fourth embodiment has a first iron core portion 421 and a second iron core portion 22 arranged adjacent to the circumferential direction R1. doing.
  • the first iron core portion 421 has a gap portion 415 formed radially inside the permanent magnet 20.
  • the gap portion 415 is connected to the hollow portion 410c of the rotor core 410. That is, there is no boundary portion between the gap portion 415 and the hollow portion 410c of the fourth embodiment.
  • the outer cylinder portion of the connecting portion 30 (see FIG. 4) is fitted into the gap portion 415.
  • the gap portion 415 is fitted with, for example, a convex portion provided on the outer cylinder portion of the connecting portion 30.
  • the gap portion 415 has a first portion 415a in which the width of the circumferential direction R1 widens inward in the radial direction, and a second portion 415b connected to the first portion 415a.
  • the second portion 415b is formed radially inward with respect to the first portion 415a.
  • the width of the second portion 415b in the circumferential direction R1 is the same in the radial direction. However, the width of the second portion 415b in the circumferential direction R1 may be widened or narrowed toward the inner side in the radial direction.
  • the gap portion 415 has a first portion 415a in which the width of the circumferential direction R1 widens toward the inner side in the radial direction.
  • the magnetic flux emitted from the radial inside of the permanent magnet 20 flows in the first iron core portion 421 along the first portion 415a and is forcibly guided to the second iron core portion 22. Therefore, among the magnetic fluxes emitted from the radial inside of the permanent magnet 20, the amount of magnetic flux flowing into the second iron core portion 22 increases.
  • the gap portion 415 does not have a radial outward surface located on the innermost side in the radial direction, and is connected to the hollow portion 410c of the rotor core 410.
  • the weight of the rotor core 410 is reduced. Therefore, the cost of the rotor 4 can be reduced while reducing the weight of the rotor 4.
  • the gap portion 415 can function as a torque transmission unit for transmitting torque from the rotor core 410 to the shaft 25.
  • the fourth embodiment is the same as any one of the first to third embodiments.
  • FIG. 19 is a diagram showing the configuration of the air conditioner 600.
  • the air conditioner 600 has an outdoor unit 501, an indoor unit 502, and a refrigerant pipe 503 connecting the outdoor unit 501 and the indoor unit 502.
  • an operation such as a cooling operation in which cold air is blown from the indoor unit 502 or a heating operation in which warm air is blown can be performed.
  • the outdoor unit 501 has an outdoor blower 150 as a blower, a frame 507 that supports the outdoor blower 150, and a housing 508 that covers the outdoor blower 150 and the frame 507.
  • FIG. 20 is a cross-sectional view showing the configuration of the outdoor unit 501 shown in FIG.
  • the outdoor blower 150 of the outdoor unit 501 has an electric motor 100 attached to the frame 507 and an impeller 504 attached to the shaft 25 of the electric motor 100.
  • the impeller 504 has a boss portion 505 fixed to the shaft 25 and blades 506 provided on the outer periphery of the boss portion 505.
  • the impeller 504 is, for example, a propeller fan.
  • the impeller 504 rotates and an air flow is generated.
  • the outdoor blower 150 can blow air.
  • the heat released when the refrigerant compressed by the compressor (not shown) is condensed by the condenser (not shown) is blown to the outside by the blower of the outdoor blower 150. discharge.
  • the electric motor 100 having the rotors 1 to 4 according to any one of the first to fourth embodiments is provided in a blower other than the outdoor blower 150 of the outdoor unit 501 (for example, the indoor blower of the indoor unit 502). May be good. Further, the electric motor 100 may be provided in a home electric appliance other than the air conditioner.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)
  • Permanent Field Magnets Of Synchronous Machinery (AREA)
PCT/JP2020/007749 2020-02-26 2020-02-26 回転子、電動機、送風機、空気調和装置、及び回転子の製造方法 Ceased WO2021171420A1 (ja)

Priority Applications (5)

Application Number Priority Date Filing Date Title
US17/790,037 US20230063523A1 (en) 2020-02-26 2020-02-26 Rotor, motor, blower, air conditioner, and manufacturing method of rotor
CN202080096606.3A CN115136456A (zh) 2020-02-26 2020-02-26 转子、电动机、送风机、空气调节装置及转子的制造方法
PCT/JP2020/007749 WO2021171420A1 (ja) 2020-02-26 2020-02-26 回転子、電動機、送風機、空気調和装置、及び回転子の製造方法
JP2022502659A JP7234455B2 (ja) 2020-02-26 2020-02-26 回転子、電動機、送風機、空気調和装置、及び回転子の製造方法
JP2023026113A JP7486629B2 (ja) 2020-02-26 2023-02-22 回転子、電動機、送風機、空気調和装置、及び回転子の製造方法

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2020/007749 WO2021171420A1 (ja) 2020-02-26 2020-02-26 回転子、電動機、送風機、空気調和装置、及び回転子の製造方法

Publications (1)

Publication Number Publication Date
WO2021171420A1 true WO2021171420A1 (ja) 2021-09-02

Family

ID=77492103

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2020/007749 Ceased WO2021171420A1 (ja) 2020-02-26 2020-02-26 回転子、電動機、送風機、空気調和装置、及び回転子の製造方法

Country Status (4)

Country Link
US (1) US20230063523A1 (https=)
JP (2) JP7234455B2 (https=)
CN (1) CN115136456A (https=)
WO (1) WO2021171420A1 (https=)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2020099121A (ja) * 2018-12-17 2020-06-25 株式会社ミツバ ロータ、モータ、及びワイパモータ
CN117833520A (zh) * 2022-09-27 2024-04-05 日本电产株式会社 混合永磁电机转子、混合永磁电机及车辆
WO2025083844A1 (ja) * 2023-10-19 2025-04-24 三菱電機株式会社 回転子、電動機、送風機および空気調和装置
WO2025203336A1 (ja) * 2024-03-27 2025-10-02 三菱電機株式会社 ロータ、モータ、送風機、空気調和装置およびロータの製造方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011103759A (ja) * 2009-05-29 2011-05-26 Asmo Co Ltd ロータ及びモータ
JP2012016130A (ja) * 2010-06-30 2012-01-19 Asmo Co Ltd ロータ、モータ、及びロータの製造方法
WO2017183162A1 (ja) * 2016-04-21 2017-10-26 三菱電機株式会社 電動機および空気調和機
WO2019026273A1 (ja) * 2017-08-04 2019-02-07 三菱電機株式会社 回転子、電動機、送風機、空気調和装置および回転子の製造方法
WO2020003341A1 (ja) * 2018-06-25 2020-01-02 三菱電機株式会社 ロータ、電動機、送風機および空気調和装置

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5634438B2 (ja) * 2012-05-24 2014-12-03 三菱電機株式会社 電動機の回転子、電動機、空気調和機、および電動機の回転子の製造方法
US9246364B2 (en) * 2012-10-15 2016-01-26 Regal Beloit America, Inc. Radially embedded permanent magnet rotor and methods thereof
JP5962632B2 (ja) * 2013-11-15 2016-08-03 株式会社デンソー 回転電機のロータ及びその製造方法
JP2018117488A (ja) * 2017-01-20 2018-07-26 日本電産株式会社 ロータ及びそれを用いたモータ
JP6689445B2 (ja) * 2017-03-03 2020-04-28 三菱電機株式会社 回転子、電動機、圧縮機および送風機
WO2018179063A1 (ja) 2017-03-27 2018-10-04 三菱電機株式会社 回転子、電動機、圧縮機、送風機、および空気調和装置
EP3605807A4 (en) * 2017-03-27 2020-03-25 Mitsubishi Electric Corporation ELECTRIC MOTOR AND AIR CONDITIONING DEVICE

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011103759A (ja) * 2009-05-29 2011-05-26 Asmo Co Ltd ロータ及びモータ
JP2012016130A (ja) * 2010-06-30 2012-01-19 Asmo Co Ltd ロータ、モータ、及びロータの製造方法
WO2017183162A1 (ja) * 2016-04-21 2017-10-26 三菱電機株式会社 電動機および空気調和機
WO2019026273A1 (ja) * 2017-08-04 2019-02-07 三菱電機株式会社 回転子、電動機、送風機、空気調和装置および回転子の製造方法
WO2020003341A1 (ja) * 2018-06-25 2020-01-02 三菱電機株式会社 ロータ、電動機、送風機および空気調和装置

Also Published As

Publication number Publication date
JP7234455B2 (ja) 2023-03-07
JPWO2021171420A1 (https=) 2021-09-02
JP7486629B2 (ja) 2024-05-17
JP2023054248A (ja) 2023-04-13
CN115136456A (zh) 2022-09-30
US20230063523A1 (en) 2023-03-02

Similar Documents

Publication Publication Date Title
US11394260B2 (en) Rotor, motor, fan, and air conditioning apparatus
JP7486629B2 (ja) 回転子、電動機、送風機、空気調和装置、及び回転子の製造方法
US10931155B2 (en) Rotor, electric motor, compressor, air conditioner, and method for manufacturing electric motor
US11101708B2 (en) Rotor, motor, air conditioning apparatus, and manufacturing method of rotor
US11973378B2 (en) Rotor, motor, fan, air conditioner, and manufacturing method of rotor
JP2023054239A (ja) 電動機、送風機及び空気調和装置
JP7062089B2 (ja) 回転子、電動機、送風機、空気調和装置および回転子の製造方法
US12081097B2 (en) Motor, fan, and air conditioner
JP7301972B2 (ja) 電動機、送風機、空気調和装置および電動機の製造方法
JP7012878B2 (ja) 回転子、電動機、送風機、空気調和装置および回転子の製造方法
JP7527469B2 (ja) ロータ、電動機、送風機、空気調和装置およびロータの製造方法
US20230378829A1 (en) Rotor, motor, blower, air conditioner, and manufacturing method of rotor

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 20921731

Country of ref document: EP

Kind code of ref document: A1

ENP Entry into the national phase

Ref document number: 2022502659

Country of ref document: JP

Kind code of ref document: A

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 20921731

Country of ref document: EP

Kind code of ref document: A1