WO2022209545A1 - 回転電機のステータ及びその製造方法 - Google Patents

回転電機のステータ及びその製造方法 Download PDF

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Publication number
WO2022209545A1
WO2022209545A1 PCT/JP2022/008839 JP2022008839W WO2022209545A1 WO 2022209545 A1 WO2022209545 A1 WO 2022209545A1 JP 2022008839 W JP2022008839 W JP 2022008839W WO 2022209545 A1 WO2022209545 A1 WO 2022209545A1
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WO
WIPO (PCT)
Prior art keywords
sheet
back yoke
stator
core
teeth
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/JP2022/008839
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English (en)
French (fr)
Japanese (ja)
Inventor
友祐 木村
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.)
Denso Corp
Original Assignee
Denso 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 Denso Corp filed Critical Denso Corp
Priority to CN202280023365.9A priority Critical patent/CN117121333A/zh
Publication of WO2022209545A1 publication Critical patent/WO2022209545A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • H02K1/12—Stationary parts of the magnetic circuit
    • H02K1/16—Stator cores with slots for windings

Definitions

  • the present disclosure relates to a stator of a rotating electric machine.
  • the stator core has a cylindrical back yoke, and a plurality of teeth projecting radially inward from the back yoke are arranged in parallel at intervals in the circumferential direction. Three-phase coils are wound around these teeth.
  • the stator core has a core sheet laminate in which a plurality of core sheets are laminated in an axial direction perpendicular to the radial direction, and end sheets attached to both axial end surfaces of the core sheet laminate. .
  • Each sheet of each core sheet and each end face sheet has a back yoke portion forming a back yoke, and a tooth portion protruding radially inward from the back yoke portion and forming teeth.
  • Each end sheet is attached to the end surface of the core sheet laminate by attaching its own back yoke portion to the back yoke portion of the adjacent core sheet.
  • each end face sheet has a protrusion of a magnetic material that protrudes from the tip of each tooth portion thereof in the axial direction opposite to the core sheet laminate side.
  • the edge sheet and the core sheet adjacent thereto may, for example, form undulations that shift in the axial direction as it progresses in the circumferential direction.
  • a gap is formed between a portion of the teeth of the end sheet and the adjacent teeth of the core sheet. occur.
  • the field magnetic flux of the rotor may intermittently generate a large force in the direction of eliminating the gap.
  • the present disclosure has been made in view of the above circumstances, and its main purpose is to suppress the generation of abnormal noise due to the collision between the teeth of the end face sheet and the adjacent teeth of the core sheet.
  • a stator of a rotating electrical machine of the present disclosure has a stator core and a coil.
  • the stator core includes a cylindrical or columnar back yoke, and a plurality of teeth projecting radially from the back yoke are arranged in parallel in the circumferential direction of the back yoke at intervals.
  • the coil is wound around the teeth.
  • the stator core comprises: a core sheet laminate in which a plurality of magnetic core sheets are laminated in an axial direction orthogonal to the radial direction; and an edge sheet.
  • Each sheet of the core sheet and the end sheet has a back yoke portion forming the back yoke, and a tooth portion protruding from the back yoke portion in the radial direction to form the teeth.
  • the end sheet is attached to the end surface of the core sheet laminate by attaching the back yoke portion of the end sheet to the back yoke portion of the adjacent core sheet.
  • the end sheet has a protruding portion of a magnetic material that protrudes from the tip of each of the tooth portions thereof in the direction opposite to the core sheet laminate side in the axial direction.
  • An annular non-magnetic connection ring is provided for connecting the projecting portions in the circumferential direction.
  • the connecting ring can create such gaps.
  • Each protruding portion of the tooth portion with the gap is connected to each protruding portion of the tooth portion where the gap is not formed.
  • the connecting ring is a non-magnetic material, there is no concern that it will adversely affect the flow of magnetic flux in the stator core. Therefore, according to the present disclosure, the occurrence of abnormal noise is suppressed by suppressing the collision between the teeth of the end face sheet and the adjacent teeth of the core sheet without adversely affecting the flow of magnetic flux in the stator core. be able to.
  • FIG. 1 is a cross-sectional view showing a rotating electric machine of the first embodiment
  • FIG. 2 is a cross-sectional view showing a cross section taken along line II-II in FIG.
  • FIG. 3 is a perspective view showing one end face sheet in the axial direction and the core sheet adjacent thereto
  • FIG. 4 is a perspective view showing a state in which a connection ring is provided on the end face sheet of FIG.
  • FIG. 5 is a cross-sectional view showing each step in manufacturing the connecting ring
  • FIG. 6 is an enlarged view showing a part of the right side of FIG. 1, FIG.
  • FIG. 7 is a cross-sectional view showing a stator of a comparative example when no connecting ring is provided;
  • FIG. 8 is a cross-sectional view showing the stator of this embodiment provided with a connecting ring,
  • FIG. 9 is a cross-sectional view showing a stator core of another embodiment,
  • FIG. 10 is a cross-sectional view showing a stator core of still another embodiment.
  • FIG. 1 is a cross-sectional view showing a rotating electrical machine 91 of the present embodiment, and more specifically, a cross-sectional view taken along line II in FIG. 2, which will be referred to next.
  • the rotating electric machine 91 may perform power running to rotate the connection target, may generate power by the rotational force of the connection target, or may perform both power running and power generation as appropriate.
  • the rotating electric machine 91 has a rotor 70 , a stator 30 and a housing 10 .
  • the center line of the rotor 70 is referred to as "axis A", the direction perpendicular to the longitudinal direction of the axis A and toward the axis A is referred to as “radially inward Ri”, and the opposite direction is referred to as “radial direction Ri”.
  • the radially inner side Ri and the radially outer side Ro are collectively referred to as the "radial direction R”.
  • the longitudinal direction of the axis A will be referred to as “upper and lower Z”
  • one of the upper and lower Z will be referred to as “upper Z+”
  • the opposite direction will be referred to as "lower Z-".
  • the rotary electric machine 91 can be installed in any direction, such as a horizontal direction or an oblique direction, in addition to the vertical direction, for the “vertical Z” referred to below. Further, hereinafter, a plan view seen from above and below Z will simply be referred to as a "plan view”, and a circumferential direction with the axis A as the center line will simply be referred to as a "circumferential direction”.
  • the rotor 70 has a rotating shaft 78 , a rotor core 75 and a plurality of field magnets 71 .
  • the rotating shaft 78 is a shaft member extending vertically Z and is installed on the axis A.
  • the rotor core 75 is a cylindrical member and is fitted on the rotating shaft 78 so as not to rotate relative to it.
  • the plurality of field magnets 71 are permanent magnets and are attached to the outer peripheral portion of the rotor core 75 at intervals in the circumferential direction. Therefore, the rotating shaft 78, the rotor core 75, and the plurality of field magnets 71 rotate together.
  • the stator 30 has a stator core 30a and a three-phase coil 30b.
  • Stator core 30 a is a cylindrical member, and is fitted onto rotor 70 with a gap between its inner peripheral surface and the outer peripheral surface of rotor 70 .
  • the stator core 30 a has a plurality of core sheets 40 and two upper and lower end sheets 50 .
  • Each core sheet 40 has a disk-like shape, and a core sheet laminate 40L is formed by stacking a plurality of core sheets 40 vertically Z.
  • Disk-shaped end face sheets 50 are attached to the upper and lower end faces of the core sheet laminate 40L, respectively.
  • a connection ring 60 is attached to each of the upper and lower end sheets 50 .
  • the three-phase coil 30b is attached to the stator core 30a.
  • the housing 10 has an upper portion 11 forming a portion near the upper Z+ side of the housing 10 and a lower portion 12 forming a portion near the lower Z ⁇ side of the housing 10 .
  • the upper portion 11 is in the shape of a bottomed cylinder opening downward Z-
  • the lower portion 12 is in the shape of a bottomed cylinder opening upward Z+.
  • the upper portion 11 and the lower portion 12 are joined together by a plurality of bolts 20 extending vertically Z and juxtaposed in the circumferential direction with the outer peripheral edge of the stator core 30a sandwiched therebetween. Thereby, the outer peripheral edge of the stator core 30 a is attached to the housing 10 .
  • a rotating shaft 78 is attached to the housing 10 via a bearing 17 .
  • the upper end of the rotating shaft 78 protrudes outward from the housing 10 , and a connection target to the rotating electric machine 91 is connected to the outwardly protruding portion.
  • FIG. 2 is a diagram showing a cross section taken along line II-II in FIG. In FIG. 2, illustration of the three-phase coil 30b is omitted.
  • Each of the plurality of field magnets 71 has an N pole radially inward Ri and an S pole radially outward Ro, and an N pole radially outward Ro and an S pole radially inward Ri. are arranged alternately in the circumferential direction.
  • the stator core 30a has a cylindrical back yoke 31, and a plurality of teeth 34 protruding radially inward Ri from the back yoke 31 are arranged side by side at intervals in the circumferential direction.
  • a slot S is formed between each two teeth 34 adjacent to each other in the circumferential direction.
  • Each tooth 34 has a tooth extending portion 35 and a tooth tip portion 36 .
  • the tooth tip portion 36 is the end portion of the tooth 34 on the rotor 70 side, that is, the end portion of the radially inner side Ri.
  • the teeth extending portions 35 are portions of the teeth 34 closer to the back yoke 31 than the tooth tip portions 36 , that is, portions radially outward Ro of the tooth tip portions 36 .
  • Each tooth 34 has a tooth tip portion 36 wider than the tooth extension portion 35 in the circumferential direction.
  • Annular connection rings 60 are provided at the upper and lower end portions of the tooth tip portions 36 , that is, the portions of the tooth tip portions 36 formed by the end sheet 50 .
  • the 3-phase coil 30b which is not shown in FIG. 2, is wound around the teeth 34 so that the 3-phase coils are shifted from each other by an electrical angle of 120°. Specifically, the three-phase coils are distributed around the teeth 34 so as to be displaced from each other by 30° in the circumferential direction in a plan view, for example.
  • the rotating electric machine 91 performs power running
  • the rotor 70 rotates due to the magnetic flux generated by the current flowing through the three-phase coil 30b acting on the field magnet 71 . Further, when the rotating electrical machine 91 generates power, the magnetic flux of the field magnet 71 acts on the three-phase coil 30b to generate power.
  • FIG. 3 is a perspective view showing the end face sheet 50 on the upper Z+ side and the adjacent core sheet 40 on the uppermost Z+ side.
  • the end face sheet 50 on the upper Z+ side has a back yoke portion 51 forming the back yoke 31, teeth 54 forming the teeth 34, and protruding portions 57 protruding from the tips of the teeth 54 upward Z+.
  • the back yoke portion 51 has a disk-like shape.
  • the plurality of tooth portions 54 are arranged side by side at intervals in the circumferential direction so as to protrude radially inward Ri from the back yoke portion 51 .
  • the tooth portion 54 has a tooth portion extension portion 55 that constitutes the tooth extension portion 35 and a tooth portion distal end portion 56 that constitutes the tooth distal end portion 36 .
  • Teeth end portions 56 are wider in the circumferential direction than teeth extension portions 55 .
  • the protruding portion 57 protrudes upward Z+ from the tip of each tooth tip portion 56 .
  • each core sheet 40 Extending portion 55 and tooth tip end portion 56 are read as “core sheet 40”, “back yoke portion 41”, “teeth portion 44”, “teeth portion extending portion 45” and “teeth tip end portion 46” respectively, and It is the same except that the description of the projecting portion 57 is omitted. That is, the configuration of each core sheet 40 is substantially the same as the configuration of the end sheet 50, but differs from the end sheet 50 in that the protruding portion 57 is not provided.
  • a plurality of caulking protrusions 52 protruding upward Z+ are spaced apart in the circumferential direction. are arranged side by side. 3, recesses 53, 43 for crimping, not shown in FIG.
  • the end face sheet 50 on the upper Z+ side is formed by punching out a magnetic plate such as a steel plate by pressing and bending. Specifically, a back yoke portion 51, a plurality of teeth portions 54 protruding radially inward Ri from the back yoke portion 51, and further radially inward Ri from the tip of each tooth portion 54 are formed by press working. A protruding portion 57 is formed, and a convex portion 52 and a concave portion 53 are formed in the back yoke portion 51 . From this state, the protruding portion 57 is bent perpendicularly to the upper Z+ side with respect to each tooth portion 54 to form the upper Z+ side end sheet 50 .
  • Each core sheet 40 is formed by punching a magnetic plate such as a steel plate by press working. Specifically, the back yoke portion 41 and the plurality of teeth portions 44 are formed by press working, and the projections 42 and the recesses 43 are formed in the back yoke portion 41 .
  • FIG. 4 is a perspective view showing a state in which a connection ring 60 is provided on the tip end portion 56 of the tooth portion of the end face sheet 50 on the upper Z+ side.
  • the connection ring 60 is entirely made of a non-magnetic material such as resin, and connects the projecting portions 57 in the circumferential direction.
  • FIG. 5 is a cross-sectional view showing each step in manufacturing the connecting ring 60.
  • the mold 100 is installed so as to cover all the protruding portions 57 of the end face sheet 50 and the tip-side portions of all the tip end portions 56 of the teeth.
  • the mold 100 has an upper mold 101 and a lower mold 102 .
  • connection ring material P such as resin, which is the material of the connection ring 60
  • the connection ring material P is brought into a fluid state by heating or the like, and then injected into the mold 100.
  • the connection ring material P is hardened by cooling or the like to mold the connection ring 60, and then the connection ring 60 is removed from the mold 100 by opening the mold 100. Release from the mold.
  • connection ring 60 is provided on the end face sheet 50 . Therefore, the connecting ring 60 covers the entire protruding portions 57 of the end sheet 50 corresponding to itself and the tip-side portions of all the tooth tip portions 56 of the end sheet 50 . On the other hand, the connecting ring 60 abuts against none of the tooth extending portions 55 and the back yoke portion 51 of the end face sheet 50 corresponding thereto.
  • FIG. 6 is an enlarged view of a right portion of the stator 30 shown in FIG.
  • Each core sheet 40 is crimped by press-fitting the convex portion 42 on the upper surface of the core sheet 40 on the lower Z ⁇ side than itself into the recessed portion 43 on the lower surface thereof, thereby is attached to the upper surface of the core sheet 40 of the .
  • a plurality of core sheets 40 are integrated to form a core sheet laminate 40L.
  • the upper Z+ side end sheet 50 is crimped by press-fitting the convex portion 42 on the upper surface of the uppermost Z+ side core sheet 40 into the recessed portion 53 on the lower surface thereof, so that the upper end surface of the core sheet laminate 40L is secured. installed.
  • the lower Z ⁇ side end sheet 50 is crimped by pressing the protrusions 52 on its upper surface into the recesses 43 on the lower surface of the lowest Z ⁇ side core sheet 40, thereby forming a core sheet laminate 40L. attached to the lower end surface of the
  • each of the sheets 50, 40 is crimped by press-fitting the convex portions 42, 52 of the sheets 40, 50 on the Z ⁇ side one lower than the sheets 50, 43 into the concave portions 53, 43 of the respective sheets 50, 40. are attached to the back yoke portions 41, 51 of the seats 40, 50 on the Z ⁇ side one lower than themselves.
  • the teeth 54, 44 of the sheets 50, 40 are not joined together.
  • Each field magnet 71 faces the inner peripheral surface of the core sheet laminate 40L and the inner peripheral surface of the connection ring 60 .
  • FIG. 7 is a cross-sectional view showing a comparative example in which the connection ring 60 is not provided on the end face sheet 50. As shown in FIG. The effect of this embodiment will be described below with reference to this comparative example.
  • the end face sheet 50 on the upper Z+ side and the core sheet 40 on the uppermost Z+ side may, for example, form undulations that shift up and down Z as they progress in the circumferential direction.
  • the back yoke portion 51 of the end face sheet 50 on the upper Z+ side is attached to the back yoke portion 41 of the core sheet 40 on the uppermost Z+ side, some teeth tip ends of the end face sheet 50 on the upper Z+ side
  • a gap G is formed between 56 and the tip end portion 46 of the tooth portion of the core sheet 40 on the uppermost Z+ side.
  • the present embodiment has a connection ring 60 as shown in FIG.
  • the connecting ring 60 connects each protruding portion 57 of the tooth tip end portion 56 with the gap G and each protruding portion 57 of the tooth tip end portion 56 without the gap G.
  • FIG. As a result, the tip portions 56 of the teeth 56 in the upper Z+ side end face sheet 50 with the gaps G formed thereon are restrained from moving in the vertical direction Z, and move toward the tip portions 46 of the teeth portion of the core sheet 40 on the uppermost Z+ side. collision is suppressed. Therefore, the generation of abnormal noise is suppressed.
  • the upper and lower connection rings 60 are non-magnetic, there is no fear of adversely affecting the flow of magnetic flux in the stator core 30a. Therefore, according to the present embodiment, it is possible to suppress the occurrence of noise without adversely affecting the flow of magnetic flux in the stator core 30a.
  • each of the upper and lower connection rings 60 entirely covers all the protruding portions 57 of the end face sheet 50 corresponding thereto. Therefore, the protruding portions 57 of the end sheets 50 corresponding to themselves can be firmly connected to each other. Moreover, on the other hand, the upper and lower connection rings 60 are in contact with neither the tooth extending portions 55 nor the back yoke portion 51 of the end sheet 50 corresponding thereto. Therefore, the connection ring 60 can be provided in a compact manner with as little waste as possible.
  • connection ring material P is injected into the mold 100 and cured.
  • the connection ring 60 is molded. Therefore, the connection ring 60 can be easily formed on the end face sheet 50 .
  • connection ring 60 does not cover the tooth extending portions 55 and the back yoke portion 51 of the end face sheet 50 corresponding thereto.
  • connection ring 60 may cover the entire end face sheet 50 corresponding to itself from the periphery.
  • the tooth extensions 55 are not connected to each other in the circumferential direction so that the slots S are not filled.
  • connection ring material P is injected into the mold 100 and cured.
  • the connection ring 60 is molded by.
  • the connecting ring 60 may be provided separately from the end sheet 50 by molding or the like while being separated from the end sheet 50 .
  • the end face sheet 50 provided separately may be attached to each projecting portion 57 of the end face sheet 50 by engagement or the like.
  • the mold 100 and the connection ring 60 molded by it cover the entire protruding portion 57 .
  • the mold 100 and connecting ring 60 may partially cover all protrusions 57 .
  • the mold 100 and the connection ring 60 molded by the mold 100 cover only the tip-side portion of the tooth tip end portion 56 .
  • the mold 100 and the connection ring 60 may cover the entire tooth tip portion 56 .
  • each sheet 50, 40 is provided with a through hole penetrating vertically Z, and a shaft member extending vertically Z is press-fitted into the through hole and crimped to integrate the sheets 50, 40. may be changed.
  • the tooth tip portions 46 and 56 are larger than the tooth portion extension portions 45 and 55 in the circumferential direction.
  • 55 in the circumferential direction may be the same as the size in the circumferential direction of the tip portions 46 and 56 of the tooth portion.
  • the rotary electric machine 91 is an inner rotor type in which the rotor 70 is installed radially inward Ri of the cylindrical stator 30.
  • An outer rotor type in which a cylindrical rotor is installed radially outward of a cylindrical stator may be used. In this case, the teeth portions 54, 44 of the sheets 50, 40 protrude radially outward Ro rather than radially inward Ri.
  • the end sheets 50 are attached to the upper and lower end surfaces of the core sheet laminate 40L, respectively. may be installed.
  • the three-phase coil 30b is wound around the teeth 34, but instead of this, a two-phase coil or a four-phase or more coil may be wound.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)
PCT/JP2022/008839 2021-04-01 2022-03-02 回転電機のステータ及びその製造方法 Ceased WO2022209545A1 (ja)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202280023365.9A CN117121333A (zh) 2021-04-01 2022-03-02 旋转电机的定子及其制造方法

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JP2021063120A JP7537347B2 (ja) 2021-04-01 2021-04-01 回転電機のステータ及びその製造方法
JP2021-063120 2021-04-01

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000023394A (ja) * 1998-07-06 2000-01-21 Sankyo Seiki Mfg Co Ltd トロイダル巻式回転電機の電機子構造
JP2009124863A (ja) * 2007-11-15 2009-06-04 Panasonic Corp モータおよびそれを用いた電子機器
JP2014161210A (ja) * 2013-01-28 2014-09-04 Asmo Co Ltd モータ
JP2014207785A (ja) * 2013-04-12 2014-10-30 アスモ株式会社 モータ

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000023394A (ja) * 1998-07-06 2000-01-21 Sankyo Seiki Mfg Co Ltd トロイダル巻式回転電機の電機子構造
JP2009124863A (ja) * 2007-11-15 2009-06-04 Panasonic Corp モータおよびそれを用いた電子機器
JP2014161210A (ja) * 2013-01-28 2014-09-04 Asmo Co Ltd モータ
JP2014207785A (ja) * 2013-04-12 2014-10-30 アスモ株式会社 モータ

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JP7537347B2 (ja) 2024-08-21
CN117121333A (zh) 2023-11-24

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