WO2023187971A1 - 埋め込み磁石型回転子および回転電機 - Google Patents

埋め込み磁石型回転子および回転電機 Download PDF

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Publication number
WO2023187971A1
WO2023187971A1 PCT/JP2022/015396 JP2022015396W WO2023187971A1 WO 2023187971 A1 WO2023187971 A1 WO 2023187971A1 JP 2022015396 W JP2022015396 W JP 2022015396W WO 2023187971 A1 WO2023187971 A1 WO 2023187971A1
Authority
WO
WIPO (PCT)
Prior art keywords
permanent magnet
rotor
magnet
communication opening
embedded
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/JP2022/015396
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
正克 松原
将 鹿野
大介 山岸
直哉 佐々木
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.)
Toshiba Corp
Toshiba Infrastructure Systems and Solutions Corp
Original Assignee
Toshiba Corp
Toshiba Infrastructure Systems and Solutions 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 Toshiba Corp, Toshiba Infrastructure Systems and Solutions Corp filed Critical Toshiba Corp
Priority to CN202280003622.2A priority Critical patent/CN117157853A/zh
Priority to JP2022543524A priority patent/JP7151023B1/ja
Priority to PCT/JP2022/015396 priority patent/WO2023187971A1/ja
Priority to EP22809630.1A priority patent/EP4503390A4/en
Priority to US18/064,033 priority patent/US12218548B2/en
Publication of WO2023187971A1 publication Critical patent/WO2023187971A1/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
    • H02K1/22—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
    • 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]
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K2213/00—Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
    • H02K2213/03—Machines characterised by numerical values, ranges, mathematical expressions or similar information

Definitions

  • the present invention relates to an embedded magnet type rotor and a rotating electric machine having the same.
  • a through hole extending in the axial direction is formed in a region close to the radially outer side of the rotor core to accommodate a permanent magnet.
  • this through hole has not only a space for accommodating the permanent magnet but also a partial space on the outside in the radial direction. This radially outer partial space serves as a flux barrier that suppresses the passage of magnetic flux.
  • a top bridge which is a part of the rotor core, is present between this radially outer partial space and the outer surface of the rotor core in order to ensure the structural strength of the rotor core.
  • This top bridge becomes a path for magnetic flux, that is, a magnetic path.
  • the magnetic flux passing through this magnetic path becomes a leakage flux that remains only within the rotor and does not interlink with the stator side, resulting in a decrease in the torque efficiency of the rotating electric machine.
  • An object of the present invention is to provide an embedded magnet rotor and a rotating electric machine in which even if a permanent magnet is damaged, its fragments do not protrude into the gap space.
  • an embedded magnet type rotor includes a rotor shaft extending in the rotation axis direction, and a rotor shaft disposed on the radially outer side of the rotor shaft and circumferentially extending near the radially outer side.
  • An embedded magnet rotor comprising: a rotor core in which a plurality of permanent magnet storage spaces are formed at intervals; and a flat permanent magnet stored in each of the plurality of permanent magnet storage spaces.
  • the permanent magnet storage space extends further radially outward from a range in which the permanent magnets are held by magnet holding outer protrusions formed on the rotor core, and the embedded magnet type rotor; It has a communication opening that communicates with a gap space between the embedded magnet type rotor and a stator disposed on the radially outer side, and the communication opening is a part of the rotor core, and the communication opening is a part of the rotor core, and The radial thickness of the two tips and the circumferential width of the communication opening in a cross section perpendicular to the direction of the rotation axis are such that the permanent magnet
  • the stator is characterized in that the stator is formed in a dimensional relationship such that fragments generated in the event of breakage do not protrude from the communication opening and come into contact with the stator.
  • a rotating electric machine is characterized by including the above-described embedded magnet type rotor, the stator, and two bearings that rotatably support the rotor shaft.
  • FIG. 1 is a cross-sectional view showing the configuration of a rotating electric machine according to an embodiment.
  • FIG. 2 is a partial cross-sectional view showing the configuration of one magnetic pole portion of the embedded magnet type rotor according to the embodiment.
  • FIG. 3 is a partial cross-sectional view showing an example of damage to one permanent magnet of the embedded magnet type rotor according to the embodiment.
  • FIG. 3 is a partial cross-sectional view showing the state of fragments in the case of breakage of one permanent magnet of the embedded magnet type rotor according to the embodiment.
  • FIG. 5 is an enlarged view of the vicinity of the communication opening in FIG. 4 illustrating the state of fragments in the case of breakage of one permanent magnet of the embedded magnet type rotor according to the embodiment.
  • FIG. 1 is a cross-sectional view showing the configuration of a rotating electrical machine 200 according to an embodiment.
  • the rotating electric machine 200 includes a rotor shaft 110 extending in the rotational axis direction, a rotor core 120 attached to the rotor shaft 110, an embedded magnet rotor 100 having a plurality of permanent magnets 130, and a rotor core 120 extending in the radial direction of the rotor core 120.
  • a cylindrical stator 10 is provided on the outside so as to surround a rotor core 120 with a gap space 15 in between, and two bearings (not shown) that rotatably support the rotor shaft 110 are provided.
  • the rotor core 120 has a plurality of electromagnetic steel sheets 120a stacked in the direction of the rotation axis. Each electromagnetic steel plate 120a has a punched portion through which the rotor shaft 110 passes, and a punched portion through which the permanent magnet 130 passes. By stacking the plurality of electromagnetic steel plates 120a, respective through holes extending in the rotation axis direction are formed in the rotor core 120.
  • FIG. 1 shows an example in which the rotor core 120 has an electromagnetic steel plate 120a, the present invention is not limited to this, and can also be applied to a block type rotor in which the rotor shaft and rotor core are integrated. be.
  • the permanent magnet 130 has a flat plate shape.
  • two permanent magnet storage spaces 121 each accommodating two permanent magnets 130 are arranged in a V-shape convex toward the inside in the radial direction.
  • FIG. 1 shows an example in which the permanent magnets 130 are arranged in a V-shape, the present invention is not limited to this, and can be applied to any arrangement in which there is a problem of protruding fragments. .
  • stator teeth 11 for winding stator windings are formed at intervals from each other in the circumferential direction.
  • the radial width of the gap space 15 is assumed to be ⁇ . That is, the radial width ⁇ of the gap space 15 is the distance between the outer circumferential surface of the rotor core 120 and the inner circumferential envelope surface of the stator 10, that is, the radially inner top portion of the stator teeth 11.
  • FIG. 2 is a partial cross-sectional view showing the configuration of one magnetic pole portion of the embedded magnet rotor 100 according to the embodiment.
  • the region sandwiched between the radially inner ends of the two V-shaped permanent magnet storage spaces 121 is the radially outer portion and the radially inner portion of the two permanent magnet storage spaces 121 in the rotor core 120. It functions as a center bridge 126 that connects the two.
  • the center flux barrier 125 is formed in the center of the center bridge 126 in FIG. 2, the case may be such that the center flux barrier 125 is not provided.
  • each permanent magnet storage space 121 in addition to a portion that stores the permanent magnet 130, there is a partial space that is outside the permanent magnet 130 in the radial direction.
  • the outer partial space 122 exists as a portion of the permanent magnet storage space 121 that is radially outer than the permanent magnet 130, that is, a portion that is far from the center bridge 126.
  • the outer partial space 122 communicates with the gap space 15 via a communication opening 128 .
  • the communication opening 128 is formed to be sandwiched between two chips 127a and 127b that form part of the outer peripheral surface of the rotor core 120.
  • a part of the rotor core 120 is provided between the permanent magnet 130 and the outer partial space 122 so as to resist the centrifugal force of the permanent magnet 130 during the rotation of the embedded magnet type rotor 100.
  • a certain convex magnet holding outer protrusion 123b is formed.
  • the magnet holding outer protrusion 123b is formed on the radially inner surface of the permanent magnet storage space 121.
  • an inner partial space 124 exists as a portion of the permanent magnet storage space 121 that is radially inner than the permanent magnet 130, that is, a portion that is close to the center bridge 126.
  • FIG. 3 is a partial cross-sectional view showing an example of damage to one permanent magnet 130 of the embedded magnet type rotor 100 according to the embodiment.
  • the centrifugal force applied to the permanent magnet 130 is received by the radially outer wall 121a of the permanent magnet storage space 121 and the magnet holding outer protrusion 123b.
  • the distance between the tip of the magnet holding outer projection 123b and the radial outer wall 121a is H.
  • the radially outer end surface 130b of the permanent magnet 130 has a side portion close to the radially inner side surface 130c in contact with the magnet holding outer protrusion 123b, and the other portion, that is, the portion having the length H, in contact with nothing. There isn't. Therefore, stress concentration occurs on the radially outer end surface 130b of the permanent magnet 130 at the tip contact portion 123p that the tip of the magnet holding outer protrusion 123b contacts.
  • the crack 131 grows radially inward of the radially outer corner 132c of the permanent magnet 130.
  • FIG. 4 is a partial cross-sectional view showing the state of fragments 132 in the case of breakage of one permanent magnet 130 of the embedded magnet type rotor 100 according to the embodiment.
  • the fragments 132 are considered to move with the radially outer corner portions 132c radially outward depending on the direction of the centrifugal force applied to the fragments 132.
  • the radially outer end surface 130b portion is restrained by the tip 127a
  • the radially outer side surface 130a portion is restrained by the chip 127b
  • the radially outer corner portion 132c is present within the communication opening 128.
  • FIG. 5 is an enlarged view of the vicinity of the communication opening 128 in FIG. 4 showing the state of the fragments 132 in the case of damage to one permanent magnet 130 of the embedded magnet type rotor 100 according to the embodiment.
  • the fragment 132 projects from within the outer subspace 122 into the communication opening 128.
  • the radially outer side surface 130a of the fragment 132 is in contact with the inner corner of the tip 127b at P1, and the radially outer end surface 130b of the fragment 132 is in contact with the inner corner of the tip 127a at P2.
  • width L of the communication opening 128 needs to be at least twice the thickness T of the electromagnetic steel sheet 120a, considering manufacturing constraints.
  • the radius r is smaller than the thickness W of the chips 127a and 127b, the radially outer side surface 130a of the fragment 132 will not protrude from the outer peripheral surface of the embedded magnet rotor 100.
  • the embedded magnet type rotor 100 satisfies the conditions of the following equations (1) and (2) regarding the outer partial space 122 of the permanent magnet storage space 121.
  • 2 ⁇ T ⁇ L ⁇ H (1) L/2-W ⁇ (2)
  • H is the distance between the tip of the magnet holding outer protrusion 123b shown in FIG. 3 and the radial outer wall 121a
  • L is the width of the communication opening
  • W is the radial thickness of the two tips
  • T is the electromagnetic steel plate 120a.
  • the embedded magnet rotor 100 since the embedded magnet rotor 100 according to the present embodiment satisfies the conditions of equations (1) and (2), the fragments 132 of the permanent magnets 130 do not protrude into the gap space 15.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Permanent Field Magnets Of Synchronous Machinery (AREA)
PCT/JP2022/015396 2022-03-29 2022-03-29 埋め込み磁石型回転子および回転電機 Ceased WO2023187971A1 (ja)

Priority Applications (5)

Application Number Priority Date Filing Date Title
CN202280003622.2A CN117157853A (zh) 2022-03-29 2022-03-29 埋入磁体式转子及旋转电机
JP2022543524A JP7151023B1 (ja) 2022-03-29 2022-03-29 埋め込み磁石型回転子および回転電機
PCT/JP2022/015396 WO2023187971A1 (ja) 2022-03-29 2022-03-29 埋め込み磁石型回転子および回転電機
EP22809630.1A EP4503390A4 (en) 2022-03-29 2022-03-29 INTEGRATED MAGNET ROTOR AND ROTATING ELECTRIC MACHINE
US18/064,033 US12218548B2 (en) 2022-03-29 2022-12-09 Embedded magnet rotor and rotary electric machine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2022/015396 WO2023187971A1 (ja) 2022-03-29 2022-03-29 埋め込み磁石型回転子および回転電機

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US18/064,033 Continuation US12218548B2 (en) 2022-03-29 2022-12-09 Embedded magnet rotor and rotary electric machine

Publications (1)

Publication Number Publication Date
WO2023187971A1 true WO2023187971A1 (ja) 2023-10-05

Family

ID=83558421

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2022/015396 Ceased WO2023187971A1 (ja) 2022-03-29 2022-03-29 埋め込み磁石型回転子および回転電機

Country Status (5)

Country Link
US (1) US12218548B2 (https=)
EP (1) EP4503390A4 (https=)
JP (1) JP7151023B1 (https=)
CN (1) CN117157853A (https=)
WO (1) WO2023187971A1 (https=)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP7799761B1 (ja) * 2024-07-16 2026-01-15 株式会社東芝 永久磁石ロータおよび回転電機

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JP2005130604A (ja) * 2003-10-23 2005-05-19 Nissan Motor Co Ltd 電磁鋼板形成体、これを用いた永久磁石内蔵型回転機用回転子、永久磁石内蔵型回転機、およびこの永久磁石内蔵型回転機を用いた車両
JP5447418B2 (ja) 2011-03-28 2014-03-19 株式会社豊田自動織機 回転電機の永久磁石埋設型回転子及び回転電機
JP2014064422A (ja) * 2012-09-24 2014-04-10 Daikin Ind Ltd ロータコアおよびその製造方法
JP2015195638A (ja) * 2014-03-31 2015-11-05 ダイキン工業株式会社 ロータ
JP2015202027A (ja) * 2014-03-31 2015-11-12 ダイキン工業株式会社 ロータ

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DE10153750A1 (de) * 2001-10-31 2003-05-22 Siemens Ag Rotor für PM-Synchronmaschine
US7385328B2 (en) * 2006-05-23 2008-06-10 Reliance Electric Technologies, Llc Cogging reduction in permanent magnet machines
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JP5851365B2 (ja) * 2012-08-31 2016-02-03 日立オートモティブシステムズ株式会社 回転電機
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JP6357859B2 (ja) * 2014-05-12 2018-07-18 富士電機株式会社 永久磁石埋め込み式回転電機
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JP2005130604A (ja) * 2003-10-23 2005-05-19 Nissan Motor Co Ltd 電磁鋼板形成体、これを用いた永久磁石内蔵型回転機用回転子、永久磁石内蔵型回転機、およびこの永久磁石内蔵型回転機を用いた車両
JP5447418B2 (ja) 2011-03-28 2014-03-19 株式会社豊田自動織機 回転電機の永久磁石埋設型回転子及び回転電機
JP2014064422A (ja) * 2012-09-24 2014-04-10 Daikin Ind Ltd ロータコアおよびその製造方法
JP2015195638A (ja) * 2014-03-31 2015-11-05 ダイキン工業株式会社 ロータ
JP2015202027A (ja) * 2014-03-31 2015-11-12 ダイキン工業株式会社 ロータ

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See also references of EP4503390A4

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP7799761B1 (ja) * 2024-07-16 2026-01-15 株式会社東芝 永久磁石ロータおよび回転電機
WO2026018480A1 (ja) * 2024-07-16 2026-01-22 株式会社 東芝 永久磁石ロータおよび回転電機

Also Published As

Publication number Publication date
JP7151023B1 (ja) 2022-10-11
US12218548B2 (en) 2025-02-04
JPWO2023187971A1 (https=) 2023-10-05
EP4503390A4 (en) 2025-11-05
CN117157853A (zh) 2023-12-01
US20230318373A1 (en) 2023-10-05
EP4503390A1 (en) 2025-02-05

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