WO2023209851A1 - 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
WO2023209851A1
WO2023209851A1 PCT/JP2022/019037 JP2022019037W WO2023209851A1 WO 2023209851 A1 WO2023209851 A1 WO 2023209851A1 JP 2022019037 W JP2022019037 W JP 2022019037W WO 2023209851 A1 WO2023209851 A1 WO 2023209851A1
Authority
WO
WIPO (PCT)
Prior art keywords
permanent magnet
rotor
embedded
rotor core
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/JP2022/019037
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
正克 松原
将 鹿野
大介 森
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 PCT/JP2022/019037 priority Critical patent/WO2023209851A1/ja
Priority to JP2022576070A priority patent/JPWO2023209851A1/ja
Priority to EP22930173.4A priority patent/EP4518102A1/en
Priority to CN202280024853.1A priority patent/CN117321885A/zh
Priority to US18/471,351 priority patent/US20240014701A1/en
Publication of WO2023209851A1 publication Critical patent/WO2023209851A1/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]
    • 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
    • H02K1/28—Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures

Definitions

  • the present invention relates to an embedded magnet rotor and a rotating electric machine.
  • 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 partial spaces on the outside and inside in the radial direction. These partial spaces serve as flux barriers that suppress the passage of magnetic flux.
  • a top bridge which is a part of the rotor core, exists between this radially outer subspace and the outer surface of the rotor core, and is an element that ensures the structural strength of the rotor core. It has become a department.
  • This top bridge becomes a path for the magnetic flux caused by the permanent magnet, that is, a magnetic path.
  • the magnetic flux passing through this magnetic path becomes 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 a rotating electric machine that can prevent excessive bending stress from being generated on the center bridge in an embedded magnet type rotor without a top bridge.
  • an embedded magnet type rotor includes a rotor shaft extending in the axial direction, and a rotor mounted on the radially outer side of the rotor shaft, and having a circumferentially extending portion on the radially outer portion of the rotor shaft. It has a rotor core in which two permanent magnet storage holes are formed that are spaced apart from each other and sandwich the respective d-axes, and a plate-shaped permanent magnet is stored in each of the permanent magnet storage holes.
  • the permanent magnet storage hole is an embedded magnet type rotor, and the permanent magnet storage hole communicates with the outside of the outer peripheral surface of the rotor core, and the storage portion of the permanent magnet storage hole that stores the permanent magnet is connected to the permanent magnet storage hole. It is characterized in that it has a gap between it and the gap is filled with a filler.
  • FIG. 1 is a cross-sectional view showing the configuration of a rotating electrical machine according to a first embodiment.
  • FIG. 2 is a partial cross-sectional view showing the configuration of the inter-pole portion of the embedded magnet type rotor according to the first embodiment.
  • FIG. 7 is a partial cross-sectional view showing the configuration of a portion between magnetic poles of a modified example of the embedded magnet type rotor according to the first embodiment.
  • FIG. 2 is a partial cross-sectional view showing the configuration of a portion between magnetic poles for explaining the effect of the embedded magnet type rotor according to the first embodiment.
  • FIG. 7 is a partial cross-sectional view showing the configuration of a portion between magnetic poles of an embedded magnet type rotor according to a second embodiment.
  • FIG. 1 is a cross-sectional view showing the configuration of a rotating electrical machine 200 according to the first embodiment.
  • the rotating electrical machine 200 includes a rotor shaft 110 extending in the direction of the rotation axis, a rotor core 120 attached to the rotor shaft 110, an embedded magnet rotor 100 having a plurality of permanent magnets 130, a stator 10, and a rotor shaft. It includes two bearings (not shown) that rotatably support 110.
  • a plurality of permanent magnet storage holes 121 are formed in the rotor core 120. Specifically, the two permanent magnet storage holes 121 are formed with the respective d-axes and the center bridge 125 in between, so as to form a convex V-shape toward the inside in the radial direction. In FIG. 1, only one of the eight d-axes is shown. Note that although FIG. 1 shows an example in which the V-shaped arrangement is in one layer, the present invention is not limited to this. A plurality of layers may be formed in the radial direction.
  • the permanent magnet 130 is plate-shaped. Although FIG. 1 shows an example in which the permanent magnet 130 has a flat plate shape, it may have a curved shape in a cross section perpendicular to the rotation axis of the rotor shaft 110 (vertical cross section).
  • the stator 10 has a cylindrical stator core 11 that is arranged radially outside of the rotor core 120 so as to surround the rotor core 120 via a gap 15 and has stator teeth 11a formed therein.
  • a plurality of stator teeth 11a for winding stator windings are formed at intervals from each other in the circumferential direction.
  • FIG. 2 is a partial cross-sectional view showing the configuration of the inter-pole portion of the embedded magnet type rotor 100 according to the first embodiment.
  • FIG. 2 shows a portion around one d-axis.
  • the two permanent magnet storage holes 121 are formed in a V-shaped arrangement convex radially inward with the center bridge 125 in between.
  • Each permanent magnet storage hole 121 includes a holding space formed by an outer wall 121a and an inner wall 121b and holding a permanent magnet 130, an outer space 121c adjacent to the radially outer side of the holding space, and a radially inner side of the holding space. It has an inner space 121d adjacent to.
  • the outer space 121c communicates with the gap 15 via an opening 126 formed in the outer peripheral surface of the rotor core 120.
  • a fan-shaped portion 128 is formed which is sandwiched between the two permanent magnet storage holes 121 so that the center bridge 125 is the key point of the fan.
  • each permanent magnet storage hole 121 The distance between the outer wall 121a and the inner wall 121b of each permanent magnet storage hole 121 is formed to be larger than the thickness of the permanent magnet 130. Therefore, an outer gap 121f and an inner gap 121g are formed between the outer wall 121a and the permanent magnet 130, and between the inner wall 121b and the permanent magnet 130, respectively.
  • the outer gap 121f and the inner gap 121g are filled with a filler to form a filling part 141 and a filling part 142, respectively.
  • the filler is, for example, a molding material such as a polymer compound or an adhesive.
  • each of the outer gap 121f and the inner gap 121g is constant, the ratio of each is not limited.
  • the ratio of one side may be 0% to 100%, that is, it may be biased toward one side.
  • FIG. 3 is a partial cross-sectional view showing the configuration of the inter-pole portion of a modified example of the embedded magnet type rotor 100 according to the first embodiment.
  • the outer space 121c and the inner space 121d are also filled with a filler, forming a filling part 143 and a filling part 144, respectively.
  • FIG. 4 is a partial cross-sectional view showing the configuration of the portion between the magnetic poles for explaining the effects of the embedded magnet type rotor 100 according to the first embodiment.
  • parts common to the embodiment are given the same reference numerals.
  • FIG. 4 shows a conventional case in which a filling portion is not formed in the permanent magnet storage hole 121, unlike the present embodiment and the modified example.
  • gaps corresponding to the outer gap 121f and the inner gap 121g as in the present embodiment are not intentionally formed, but in order to insert the permanent magnet 130 into the permanent magnet storage hole 121. The required gap is present.
  • a circumferential load is applied to the permanent magnet 130 and the fan-shaped portion 128 due to its torque.
  • excessive weight is applied during acceleration or deceleration. This circumferential load causes excessive bending stress to occur in the center bridge 125.
  • the fan-shaped portion 128 and the adjacent portion of the rotor core 120 are mechanically integrated through at least the filling portion 141 and the filling portion 142.
  • the load applied to the fan-shaped portion 128 is transmitted to the adjacent portion of the rotor core 120, and no bending stress is generated on the center bridge 125.
  • FIG. 5 is a partial cross-sectional view showing the configuration of a portion between magnetic poles of an embedded magnet type rotor 100a according to the second embodiment.
  • This embodiment is a modification of the first embodiment.
  • the embedded magnet type rotor 100a of the rotating electric machine 200a in this embodiment has a permanent magnet 131 instead of the permanent magnet 130 in the first embodiment.
  • the permanent magnet 131 is a bonded magnet.
  • the permanent magnet storage hole 122 is filled with a bonded magnet to form a permanent magnet 131. Therefore, unlike the first embodiment. No gap is formed between the permanent magnet 131 and the permanent magnet storage hole 122.
  • the permanent magnet 131 is not flat but curved in the width direction, but the permanent magnet 131 is not limited to this. For example, it may be formed to accommodate a flat permanent magnet.
  • the fan-shaped portion 128 and the adjacent portion of the rotor core 120 are mechanically integrated via the permanent magnet 131. As a result, the load applied to the fan-shaped portion 128 is transmitted to the adjacent portion of the rotor core 120, and no bending stress is generated on the center bridge 125.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Permanent Field Magnets Of Synchronous Machinery (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)
PCT/JP2022/019037 2022-04-27 2022-04-27 埋め込み磁石型回転子および回転電機 Ceased WO2023209851A1 (ja)

Priority Applications (5)

Application Number Priority Date Filing Date Title
PCT/JP2022/019037 WO2023209851A1 (ja) 2022-04-27 2022-04-27 埋め込み磁石型回転子および回転電機
JP2022576070A JPWO2023209851A1 (https=) 2022-04-27 2022-04-27
EP22930173.4A EP4518102A1 (en) 2022-04-27 2022-04-27 Interior permanent magnet rotor and rotating electric machine
CN202280024853.1A CN117321885A (zh) 2022-04-27 2022-04-27 磁铁嵌入式转子以及旋转电机
US18/471,351 US20240014701A1 (en) 2022-04-27 2023-09-21 Interior magnet rotor and rotary electric machine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2022/019037 WO2023209851A1 (ja) 2022-04-27 2022-04-27 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
US18/471,351 Continuation US20240014701A1 (en) 2022-04-27 2023-09-21 Interior magnet rotor and rotary electric machine

Publications (1)

Publication Number Publication Date
WO2023209851A1 true WO2023209851A1 (ja) 2023-11-02

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ID=88518296

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2022/019037 Ceased WO2023209851A1 (ja) 2022-04-27 2022-04-27 埋め込み磁石型回転子および回転電機

Country Status (5)

Country Link
US (1) US20240014701A1 (https=)
EP (1) EP4518102A1 (https=)
JP (1) JPWO2023209851A1 (https=)
CN (1) CN117321885A (https=)
WO (1) WO2023209851A1 (https=)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002010547A (ja) * 2000-06-16 2002-01-11 Yamaha Motor Co Ltd 永久磁石回転子及びその製造方法
JP2013046421A (ja) * 2011-08-21 2013-03-04 Toyota Industries Corp 永久磁石埋設型電動モータ
JP2014050208A (ja) * 2012-08-31 2014-03-17 Hitachi Automotive Systems Ltd 回転電機
WO2018025407A1 (ja) * 2016-08-05 2018-02-08 三菱電機株式会社 コンシクエントポール型の回転子、電動機および空気調和機
JP2020182358A (ja) 2019-04-26 2020-11-05 株式会社東芝 回転電機の回転子

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004104962A (ja) * 2002-09-12 2004-04-02 Toshiba Industrial Products Manufacturing Corp 永久磁石式リラクタンス型回転電機
JP5399343B2 (ja) * 2010-08-20 2014-01-29 株式会社三井ハイテック 永久磁石の樹脂封止方法及びその方法で製造された積層鉄心
JP2013099048A (ja) * 2011-10-31 2013-05-20 Toyota Industries Corp 永久磁石式回転電機の回転子、及び永久磁石式回転電機
JP2015186422A (ja) * 2014-03-26 2015-10-22 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
WO2021117176A1 (ja) * 2019-12-12 2021-06-17 三菱電機株式会社 ロータ、電動機、ファン、及び空気調和機

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002010547A (ja) * 2000-06-16 2002-01-11 Yamaha Motor Co Ltd 永久磁石回転子及びその製造方法
JP2013046421A (ja) * 2011-08-21 2013-03-04 Toyota Industries Corp 永久磁石埋設型電動モータ
JP2014050208A (ja) * 2012-08-31 2014-03-17 Hitachi Automotive Systems Ltd 回転電機
WO2018025407A1 (ja) * 2016-08-05 2018-02-08 三菱電機株式会社 コンシクエントポール型の回転子、電動機および空気調和機
JP2020182358A (ja) 2019-04-26 2020-11-05 株式会社東芝 回転電機の回転子

Also Published As

Publication number Publication date
JPWO2023209851A1 (https=) 2023-11-02
US20240014701A1 (en) 2024-01-11
EP4518102A1 (en) 2025-03-05
CN117321885A (zh) 2023-12-29

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