WO2019123962A1 - ロータおよびモータ - Google Patents

ロータおよびモータ Download PDF

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Publication number
WO2019123962A1
WO2019123962A1 PCT/JP2018/043033 JP2018043033W WO2019123962A1 WO 2019123962 A1 WO2019123962 A1 WO 2019123962A1 JP 2018043033 W JP2018043033 W JP 2018043033W WO 2019123962 A1 WO2019123962 A1 WO 2019123962A1
Authority
WO
WIPO (PCT)
Prior art keywords
rotor
magnet
rotor core
circumferential direction
central axis
Prior art date
Application number
PCT/JP2018/043033
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
邦明 田中
Original Assignee
日本電産株式会社
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 日本電産株式会社 filed Critical 日本電産株式会社
Priority to CN201880081481.XA priority Critical patent/CN111492563A/zh
Priority to JP2019560898A priority patent/JPWO2019123962A1/ja
Publication of WO2019123962A1 publication Critical patent/WO2019123962A1/ja

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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
    • 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 present invention relates to a rotor and a motor.
  • the rotor of the motor includes a rotor core that rotates with the shaft, and a plurality of magnets provided in the circumferential direction of the rotor core.
  • rotors so-called consistent rotors are known.
  • Patent Document 1 discloses a consistent type rotor in which salient poles are provided between magnets adjacent to each other in the circumferential direction.
  • the rotor has a magnet as one magnetic pole and a salient pole as the other magnetic pole.
  • An object of the present invention is to provide a rotor and a motor capable of suppressing vibration and noise at the time of operation.
  • One aspect of the rotor according to the present invention is a rotor of a consistent type motor, comprising: a shaft rotating around a central axis extending along the vertical direction; and a rotor core fixed to the shaft and having a plurality of magnet housings; A plurality of magnets contained in the rotor core, spaced in the circumferential direction around the central axis, and housed in the magnet housing portion, the magnets adjacent to each other in the circumferential direction in the rotor core Between the two, a salient pole portion protruding outward in the radial direction centering on the central axis is provided, an iron core portion is provided on the radial direction outer side of the magnet, and a curvature radius of an outer peripheral surface of the salient pole portion is The radius of curvature of the outer peripheral surface of the iron core portion is smaller.
  • One aspect of the motor of the present invention includes the above-described rotor, and a stator that faces the rotor in the radial direction via a gap.
  • a rotor and a motor are provided that can suppress vibration and noise during operation.
  • FIG. 1 is a schematic cross-sectional view of a motor according to an embodiment.
  • FIG. 2 is a cross-sectional view of the motor of one embodiment.
  • FIG. 3 is a cross-sectional view of the rotor of one embodiment.
  • FIG. 4 is a graph showing a change in magnetic flux density in the circumferential direction of the rotor when the width in the circumferential direction of the core portion is made larger than the width in the circumferential direction of the salient pole in the rotor of one embodiment.
  • FIG. 1 is a schematic cross-sectional view of a motor according to an embodiment.
  • FIG. 2 is a cross-sectional view of the motor of one embodiment.
  • FIG. 3 is a cross-sectional view of the rotor of one embodiment.
  • FIG. 4 is a graph showing a change in magnetic flux density in the circumferential direction of the rotor when the width in the circumferential direction of the core portion is made larger than the width in the circumferential direction of the salient pole in
  • FIG. 5 is a graph showing the change (distribution) of the magnetic flux density in the circumferential direction of the rotor 13 when the width in the circumferential direction of the iron core and the width in the circumferential direction of the salient pole are equal in the rotor of the embodiment. It is.
  • FIG. 1 is a schematic cross-sectional view of a motor 10 according to the present embodiment.
  • a motor (consistent motor) 10 includes a housing 11, a stator 12, a rotor 13 provided with a shaft 20 disposed along a central axis J extending in the vertical direction, and a bearing holder 14. And bearings 15 and 16.
  • the shaft 20 is rotatably supported by the bearings 15 and 16.
  • the shaft 20 has a cylindrical shape extending in a direction along the central axis J.
  • axial direction a direction parallel to the central axis J
  • radial direction a direction parallel to the central axis J
  • radial direction a direction parallel to the central axis J
  • radial direction a direction parallel to the central axis J
  • radial direction a radial direction centered on the central axis J
  • radial direction a radial direction centered on the central axis J
  • the central axis J is centered
  • the circumferential direction to be taken, that is, around the axis of the central axis J is simply referred to as "circumferential direction”.
  • plane view means a state viewed from the axial direction.
  • the scale, the number, etc. in an actual structure and each structure may be made different.
  • FIG. 2 is a cross-sectional view of the motor of the present embodiment.
  • the stator 12 faces the rotor 13 in the radial direction outside the rotor 13 with a gap in between.
  • the stator 12 includes a plurality of teeth 17 spaced apart in the circumferential direction, and a coil 18 wound around the teeth 17.
  • the teeth 17 radially face the rotor 13.
  • the coil 18 generates a magnetic field to be applied to the rotor 13.
  • twelve teeth 17 and coils 18 are provided. That is, the motor 10 of the present embodiment has 12 slots.
  • FIG. 3 is a cross-sectional view of the rotor of the present embodiment.
  • illustration of the shaft 20 is abbreviate
  • the rotor 13 includes a shaft 20 (see FIG. 2), a rotor core 30, and a plurality of magnets 50 included in the rotor core 30.
  • the rotor core 30 has a columnar shape extending in the axial direction. Although not shown, the rotor core 30 is configured, for example, by laminating a plurality of plate members in the axial direction. As shown in FIG. 3, the rotor core 30 includes a fixing hole 31, a magnet housing 35, a first projection (iron core) 37, and a second projection (protruding pole) 38.
  • the fixing hole 31 penetrates the rotor core 30 in the axial direction.
  • the shape viewed along the axial direction of the fixing hole 31 is a circular shape centering on the central axis J.
  • the shaft 20 (see FIG. 2) is passed through the fixing hole 31.
  • the inner peripheral surface of the fixing hole 31 is fixed to the outer peripheral surface of the shaft 20.
  • the rotor core 30 is thereby fixed to the shaft 20.
  • the magnet housing portion 35 houses the magnet 50.
  • a plurality of magnet housing portions 35 are provided on the outer peripheral portion of the rotor core 30 at intervals in the circumferential direction.
  • the plurality of magnet housing portions 35 are arranged at equal intervals in the circumferential direction.
  • the plurality of magnet housing portions 35 are arranged at positions equidistantly in the radial direction from the central axis J, and are arranged in a so-called concentric manner.
  • the number of magnet housings 35 provided in the rotor core 30 is, for example, five.
  • the magnet housing 35 extends in the axial direction.
  • the magnet housing portion 35 is a through hole penetrating the rotor core 30 in the axial direction, but may be a bottomed hole formed in a part of the rotor core 30 in the axial direction.
  • the magnet housing portion 35 includes an inner support surface 35a, an outer support surface 35b, and end support surfaces 35c and 35c.
  • the inner support surface 35 a is provided radially inward in the magnet housing portion 35.
  • the inner support surface 35 a is a flat surface orthogonal to the radial direction.
  • the outer side support surface 35b is provided in parallel with the inner side support surface 35a at intervals in the radial direction with respect to the inner side support surface 35a.
  • the outer side support surface 35b is a flat surface orthogonal to the radial direction.
  • the end support surfaces 35c, 35c extend radially outward from both circumferential ends of the inner support surface 35a.
  • the end support surface 35c is provided only on a part of the inner support surface 35a in the direction connecting the inner support surface 35a and the outer support surface 35b.
  • the magnet housing portion 35 is provided with an opening 35d that opens in the circumferential direction between the end support surface 35c and the outer support surface 35b.
  • the circumferential intervals of the plurality of magnet housing portions 35 are, for example, equal to one another.
  • the number of the plurality of magnet housings 35 is, for example, five.
  • the first protrusion 37 and the second protrusion 38 are provided on the outer peripheral portion of the rotor core 30.
  • the first protrusions 37 are disposed radially outward of the magnets 50 housed in the respective magnet housings 35.
  • the first projection 37 is made of the same material as the rotor core 30.
  • the first protrusion 37 is provided as an iron core located on the radially outer side of the magnet 50.
  • the first protrusion 37 protrudes radially outward.
  • the first protrusion 37 includes extending surfaces 37a and 37a and an outer peripheral surface 37b. The extending surfaces 37 a and 37 a extend radially outward from both circumferential ends of the outer support surface 35 b of the magnet housing portion 35.
  • the outer circumferential surface 37b bulges radially outward from the extending surfaces 37a, 37a on both sides in the circumferential direction.
  • the outer peripheral surface 37b is an arc having a curvature radius R1 centered on the central axis J when viewed from the axial direction.
  • the first projection 37 continuously extends in a uniform cross-sectional shape from one axial end of the rotor core 30 to the other axial end of the rotor core 30.
  • the dimension T1 in the radial direction between the radially outer side surface 50b of the magnet 50 and the outer peripheral surface of the rotor core 30, ie, the outer peripheral surface 37b of the first projection 37 is smaller than the thickness T2 in the radial direction of the magnet 50 . That is, the dimension T1 in the radial direction of the first protrusion 37 as the core portion is smaller than the thickness T2 in the radial direction of the magnet 50.
  • the second protrusions 38 are located between the magnets 50 adjacent to each other in the circumferential direction.
  • the second projection 38 protrudes radially outward.
  • the outer peripheral surface 38a on the radially outer side of the second protrusion 38 has an arc shape with a curvature radius R2 centered on a point C set radially outward of the central axis J when viewed from the axial direction.
  • the point C is disposed on a line L passing through the center of the circumferential direction of the magnets 50 adjacent to each other in the circumferential direction from the central axis J of the rotor core 30 when viewed from the axial direction.
  • the second projection 38 continuously extends in a uniform cross section from one axial end of the rotor core 30 to the other axial end of the rotor core 30.
  • the circumferential width W1 of the first projection 37 is larger than the circumferential width W2 of the second projection 38 (W1> W2).
  • the curvature radius R2 of the outer peripheral surface 38a of the second projection 38 is smaller than the curvature radius R1 of the outer peripheral surface 37b of the first projection 37 (R1> R3).
  • the rotor core 30 is provided with a recess 39.
  • the recess 39 is provided on the outer peripheral portion of the rotor core 30.
  • the recess 39 is provided between the first protrusion 37 and the second protrusion 38 in the circumferential direction. That is, the recess 39 is provided on both sides in the circumferential direction of the second protrusion 38.
  • the recess 39 is recessed radially inward of the first protrusion 37 and the second protrusion 38.
  • the rotor core 30 is provided with a plurality of holes 40 radially outside the fixing hole 31 and radially inside the magnet housing portion 35.
  • the plurality of holes 40 are arranged at equal intervals in the circumferential direction.
  • the rotor core 30 is provided with ten holes 40. Each hole 40 extends axially and penetrates the rotor core 30 in the axial direction.
  • the magnet 50 is a rectangle whose transverse cross section is a radial direction as the longitudinal direction, and is a substantially square pole extending in the axial direction.
  • the magnet 50 is inserted into the magnet housing portion 35. Thereby, the magnet 50 is included in the outer peripheral portion of the rotor core 30.
  • Each magnet 50 is arrange
  • the plurality of magnets 50 are arranged at equal intervals in the circumferential direction. That is, the plurality of magnets 50 are provided at intervals in the circumferential direction around the central axis J. In the present embodiment, the number of magnets 50 provided on the rotor 13 is five.
  • the radially inner side surface 50 a of the magnet 50 contacts the inner support surface 35 a of the magnet housing portion 35.
  • the radially outer side surface 50 b of the magnet 50 contacts the outer support surface 35 b of the magnet housing portion 35.
  • a part of the end surfaces 50 c on both sides in the circumferential direction of the magnet 50 is in contact with the end support surface 35 c of the magnet housing portion 35.
  • the magnet 50 is positioned in the circumferential direction and the radial direction by being housed in the magnet housing portion 35.
  • the end surfaces 50c on both sides in the circumferential direction of the magnet 50 have an outer peripheral side end surface 50d located on the radially outer side of the end support surface 35c.
  • the outer peripheral side end face 50 d is exposed to the recess 39 from the opening 35 d of the magnet housing portion 35.
  • the rotor 13 of the present embodiment includes ten magnetic poles configured by the magnets 50 and the second protrusions 38.
  • FIG. 4 shows the change (distribution) of the magnetic flux density in the circumferential direction of the rotor 13 when the circumferential width W1 of the first projection 37 is larger than the circumferential width W2 of the second projection 38. It is a graph. As shown in FIG. 4, in the rotor 13 of the present embodiment, a first projection 37 which is an actual pole provided with the magnet 50 and a second projection 38 which is a pseudo pole which is not provided with the magnet 50. The magnetic flux density is approximately equal.
  • FIG. 5 shows the circumference of the rotor 13 in the case where the width W1 in the circumferential direction of the first protrusion 37 and the width W2 in the circumferential direction of the second protrusion 38 are equal, as a comparison object with the rotor 13 of this embodiment. It is a graph which shows the change (distribution) of the magnetic flux density in direction. As shown in FIG. 5, in the rotor 13 in which the width W1 in the circumferential direction of the first protrusion 37 and the width W2 in the circumferential direction of the second protrusion 38 are equal to each other, The magnetic flux density is different between the one protrusion 37 and the second protrusion 38 which is a pseudo pole portion in which the magnet 50 is not provided.
  • the magnetic flux density in the first protrusion 37 is higher than the magnetic flux density in the second protrusion 38. This is because the amount of magnetic flux interlinked to the stator 12 from the second protrusion 38 side is larger than the amount of magnetic flux interlinked to the stator 12 from the first protrusion 37 side.
  • the magnet 50 is contained in the rotor core 30, and the circumferential width W1 of the first protrusion 37 provided on the radially outer side of the magnet 50 is the first The width W2 is larger than the circumferential width W2 of the two protrusions 38.
  • the amount of magnetic flux interlinked from the second projection 38 to the stator 12 can be reduced, and the amount of magnetic flux interlinked from the first projection 37 and the second projection 38 to the stator 12 can be made uniform.
  • it is possible to reduce the variation of the radial force caused by the non-uniformity of the magnetic flux and it is possible to reduce the vibration and noise during operation of the rotor 13. Therefore, the rotor 13 and the motor 10 capable of suppressing vibration and noise during operation are provided.
  • the dimension T1 in the radial direction between the radially outer side surface 50b of the magnet 50 and the outer peripheral surface of the rotor core 30, ie, the outer peripheral surface 37b of the first protrusion 37 It is smaller than the radial thickness T2.
  • the magnet 50 can be brought closer to the stator 12 while being held in the magnet housing portion 35. Therefore, the magnetic flux is prevented from leaking except between the magnet 50 and the teeth 17.
  • the recess 39 that is recessed inward in the radial direction is provided on both sides in the circumferential direction of the second protrusion 38.
  • the outer peripheral side end face 50 d which is at least a part of the magnet 50 is exposed to the recess 39.
  • the magnetic flux flows directly between the magnet 50 and the stator 12 without passing through a part of the rotor core 30.
  • the flow of magnetic flux can be made smooth.
  • the magnet 50 is housed in the magnet housing portion 35. Thereby, when the rotor 13 rotates at high speed, the magnet 50 is prevented from being detached from the rotor core 30 by the centrifugal force.
  • the dimension S2 of the gap between the second projection 38 and the teeth 17 in the radial direction is the same as the dimension S1 of the gap between the first projection 37 and the teeth 17.
  • the application of the motor provided with the rotor of the embodiment described above and its variation is not particularly limited.
  • the motor including the rotors of the above-described embodiment and the modification thereof is mounted on, for example, an electric pump, an electric power steering, and the like.
  • SYMBOLS 10 Motor (consistent type motor), 12 ... Stator, 13 ... Rotor, 17 ... Teeth, 20 ... Shaft, 30 ... Rotor core, 35 ... Magnet accommodation part, 37 ... 1st projection part (iron core part), 37b ... Outer peripheral surface , 38: second projection (salicy pole) 38a: outer peripheral surface, 39: recess, 50: magnet, J: central axis, R1, R2: radius of curvature, S1, S2: size of gap, W1, W2: Circumferential width, T1 ... dimensions, T2 ... thickness

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)
  • Permanent Field Magnets Of Synchronous Machinery (AREA)
PCT/JP2018/043033 2017-12-21 2018-11-21 ロータおよびモータ WO2019123962A1 (ja)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN201880081481.XA CN111492563A (zh) 2017-12-21 2018-11-21 转子和马达
JP2019560898A JPWO2019123962A1 (ja) 2017-12-21 2018-11-21 ロータおよびモータ

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2017245178 2017-12-21
JP2017-245178 2017-12-21

Publications (1)

Publication Number Publication Date
WO2019123962A1 true WO2019123962A1 (ja) 2019-06-27

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PCT/JP2018/043033 WO2019123962A1 (ja) 2017-12-21 2018-11-21 ロータおよびモータ

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JP (1) JPWO2019123962A1 (zh)
CN (1) CN111492563A (zh)
WO (1) WO2019123962A1 (zh)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021161421A1 (ja) * 2020-02-12 2021-08-19 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

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010263774A (ja) * 2009-04-10 2010-11-18 Asmo Co Ltd ロータ及びモータ
JP2010263763A (ja) * 2008-12-17 2010-11-18 Asmo Co Ltd ブラシレスモータ
JP2012110214A (ja) * 2010-10-19 2012-06-07 Asmo Co Ltd ブラシレスモータ
JP2012244783A (ja) * 2011-05-19 2012-12-10 Mitsubishi Electric Corp 磁石埋め込み型回転子、電動機、圧縮機、空気調和機、および、電気自動車
JP2014131376A (ja) * 2012-12-28 2014-07-10 Denso Corp 回転子、および、これを用いた回転電機

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010263763A (ja) * 2008-12-17 2010-11-18 Asmo Co Ltd ブラシレスモータ
JP2010263774A (ja) * 2009-04-10 2010-11-18 Asmo Co Ltd ロータ及びモータ
JP2012110214A (ja) * 2010-10-19 2012-06-07 Asmo Co Ltd ブラシレスモータ
JP2012244783A (ja) * 2011-05-19 2012-12-10 Mitsubishi Electric Corp 磁石埋め込み型回転子、電動機、圧縮機、空気調和機、および、電気自動車
JP2014131376A (ja) * 2012-12-28 2014-07-10 Denso Corp 回転子、および、これを用いた回転電機

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021161421A1 (ja) * 2020-02-12 2021-08-19 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
JPWO2021161421A1 (zh) * 2020-02-12 2021-08-19
JP7204018B2 (ja) 2020-02-12 2023-01-13 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

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JPWO2019123962A1 (ja) 2020-12-10
CN111492563A (zh) 2020-08-04

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