WO2014030547A1 - Structure de rotor et procédé de fabrication de rotor pour machine électrique tournante de type à aimant permanent - Google Patents

Structure de rotor et procédé de fabrication de rotor pour machine électrique tournante de type à aimant permanent Download PDF

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Publication number
WO2014030547A1
WO2014030547A1 PCT/JP2013/071457 JP2013071457W WO2014030547A1 WO 2014030547 A1 WO2014030547 A1 WO 2014030547A1 JP 2013071457 W JP2013071457 W JP 2013071457W WO 2014030547 A1 WO2014030547 A1 WO 2014030547A1
Authority
WO
WIPO (PCT)
Prior art keywords
permanent magnet
rotor
notch
type rotating
stator
Prior art date
Application number
PCT/JP2013/071457
Other languages
English (en)
Japanese (ja)
Inventor
浩平 室田
徹 仲田
Original Assignee
日産自動車株式会社
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 日産自動車株式会社 filed Critical 日産自動車株式会社
Publication of WO2014030547A1 publication Critical patent/WO2014030547A1/fr

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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
    • H02K1/27—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

Definitions

  • the present invention relates to a rotor structure using a permanent magnet for a rotating electrical machine such as a motor or a generator and a manufacturing method thereof.
  • an embedded magnet type (IPM) motor in which a permanent magnet is embedded in a rotor slot formed in a rotor is known.
  • JP2009-142081A issued by the Japan Patent Office or in 2009, cleaves a permanent magnet formed by pressure-molding magnetic powder to generate a plurality of split pieces for a permanent magnet inserted into the rotor slot of such an IPM motor. It has been proposed to obtain an eddy current suppression effect by restoring the permanent magnet by inserting the piece into the rotor slot in an adjacent state.
  • the coercive force required for the permanent magnet is large on the stator side, that is, on the portion close to the supply side of the external magnetic field. This is because the coercive force necessary for the permanent magnet is determined by the magnitude of the external magnetic field input to the magnet. As a result, the required coercive force of the permanent magnet is increased on the stator side, which is the source of the external magnetic field.
  • a notch is formed in advance by cutting or the like at the cleaved portion.
  • the permanent magnet breaks from the notch and becomes a broken piece.
  • the notch is a factor that impairs the anti-demagnetization performance of the rotor.
  • the present invention has been made to solve the above problems, and an object thereof is to improve the anti-demagnetization performance of a rotor using a split piece permanent magnet of an IPM motor.
  • a rotor structure of a permanent magnet type rotating electrical machine includes a rotor core that is disposed inside a stator and includes a central axis and a rotor slot that is formed substantially parallel to the central axis. And a permanent magnet composite having a notch, which is composed of a plurality of permanent magnet pieces arranged adjacent to each other.
  • the permanent magnet composite in the rotor slot has a first surface and a second surface far from the first surface with respect to the stator, and the permanent magnet composite has a notch located on the second surface. Located in the rotor slot.
  • FIG. 1 is a perspective view of a rotor core and permanent magnet composite according to an embodiment of the present invention.
  • FIG. 2 is a diagram illustrating stress concentration on the burr due to centrifugal force.
  • FIG. 3 is a diagram for explaining the relationship between the direction of the magnetic flux from the stator and the direction of the notch.
  • FIG. 4 is a cross-sectional view of the rotor core for explaining a variation regarding the arrangement of the magnets on the rotor core.
  • FIG. 5 is a cross-sectional view of the split piece showing variations relating to the transverse shape of the split piece.
  • FIG. 6 is a perspective view of a rotor core and a permanent magnet composite for explaining variations regarding the forming direction of the notch.
  • FIG. 7 is a perspective view of a rotor core and a permanent magnet composite for explaining another variation regarding the forming direction of the notch.
  • the rotor 1 of the IPM motor has four rotor slots 4 inside a rotor core 5.
  • the rotor core 5 has an annular cross section centered on the central axis O.
  • Four rotor slots 4 surround the central axis O and are formed at intervals of 90 degrees.
  • Each rotor slot 4 is parallel to the central axis O. That is, each rotor slot 4 extends in the longitudinal direction.
  • a plurality of split pieces 2 of permanent magnets are inserted into each rotor slot 4.
  • the split piece 2 is produced by pressing a magnetic powder to produce a permanent magnet, forming a notch 3 in the permanent magnet, and then cutting the permanent magnet from the notch 3 with a cleaving device. Generated.
  • the notch 3 is formed by melting a predetermined portion of the notch 3 of the permanent magnet by heating. Specifically, the notch 3 is formed by irradiating a laser at a predetermined position of the notch 3 of the permanent magnet.
  • the split pieces 2 generated in this way are sequentially inserted into the rotor slots 4 adjacent to each other in the axial direction in a state where the split cross section is orthogonal to the central axis O. At that time, the split piece 2 is inserted into the rotor slot 4 so that the notch 3 is positioned far from the stator in the rotor slot 4, that is, the notch 3 faces the central axis O.
  • the permanent magnet composite 20 configured in the rotor slot 4 in this way has a first surface 20A close to the stator and a second surface 20B located farther from the first surface 20A with respect to the stator.
  • the split piece 2 is inserted into the rotor slot 4 so that the notch 3 is positioned on the second surface 20B.
  • Each rotor slot 4 is embedded with a permanent magnet composite 20 configured as described above.
  • the permanent magnet composite 20 may be formed by laminating and adhering the magnet pieces 2 outside the rotor slot 4 in advance, and the formed permanent magnet composite 20 may be inserted into the rotor slot 4.
  • a hole in the longitudinal direction is formed in the center of the rotor core 5 in advance.
  • the rotor core 5 is fixed to a rotating shaft (not shown) that passes through the hole.
  • a stator (not shown) is disposed so as to surround the outer periphery of the rotor core 5.
  • the rotor core 1 configured as described above is rotated by the magnetic force exerted on the permanent magnet composite 20 composed of the split pieces 2 embedded in the four rotor slots 4 by the magnetic field formed by the stator during operation of the IPM motor. .
  • All of the plurality of split pieces 2 constituting the permanent magnet composite in the four rotor slots 4 are arranged with the notch portions 3 directed toward the central axis O on the opposite side of the stator. That is, since the notch 3 does not face the stator, the rotor 1 has a structure in which the resistance to demagnetization is not easily lowered by the notch 3. This will be specifically described below.
  • the heat-affected zone is a layer in which so-called irreversible demagnetization occurs in which the magnetic properties change due to the heat energy generated by laser irradiation and the magnetic force before irradiation does not return even after the temperature is lowered.
  • the heat-affected zone is formed over a wider area than the coercive force drop zone.
  • the rotor 1 When the notch 3 is disposed in the rotor slot 4 toward the stator, that is, when the notch 3 is formed on the first surface 20A, the rotor 1 causes the coercive force lowering portion and the heat affected layer to face the magnetic flux from the stator. In other words, a decrease in anti-demagnetization performance is inevitable.
  • the notch portion 3 faces the central axis O by disposing the notch portion 3 at a position away from the stator in the rotor slot 4, that is, on the second surface 20 ⁇ / b> B.
  • the permanent magnet composite 20 composed of a plurality of adjacent split pieces 2 is in a state in which the coercive force lowering portion and the heat-affected layer are directed to the opposite side with respect to the stator. Therefore, although the rotor 1 has the notch portion 3, it is difficult to be affected by the coercive force lowering portion and the heat-affected layer with respect to the magnetic flux from the stator, and high demagnetization resistance can be maintained.
  • the cutout portion 3 is formed using thermal energy, in particular, by forming the cutout portion 3 by laser irradiation, it is easy to form the cutout portion 3 in the permanent magnet. Can be done.
  • a method for forming the notch 3 inevitably generates a heat-affected layer.
  • the disposition of the notch 3 at a position far from the stator in the rotor slot 4, that is, the second surface, is remarkable with respect to the permanent magnet composite in which the notch 3 is formed by laser irradiation or the like where formation of a heat-affected layer is unavoidable It brings about an effect.
  • the coercive force required for the rotational operation of the IPM motor is smaller on the inner side of the rotor core 5 than on the outer side of the rotor core 5 facing the stator. Therefore, by arranging the coercive force lowering portion and the heat-affected layer toward the inner side of the rotor core 5, an optimal magnet arrangement in accordance with the required coercive force is realized.
  • burrs may occur on both sides of the notch 3 when the notch 3 is generated.
  • the centrifugal force accompanying the rotation of the IPM motor increases the contact pressure between the burr and the wall surface of the rotor slot 4.
  • the compressive stress generated in the burr increases with the length of the split piece 2 in the adjacent direction as shown in FIG.
  • the notch 3 is arranged on the second surface 20B corresponding to a position away from the stator in the rotor slot 4 in advance, so that the notch 3 is directed to the central axis O. Therefore, the centrifugal force accompanying the rotation of the IPM motor acts on the split piece 2 in the direction of reducing the contact pressure between the burr and the wall surface of the rotor slot 4. Therefore, even if burrs remain around the notch 3 of the split piece 2, the load due to the centrifugal force does not concentrate on the burrs when the IPM motor rotates.
  • FIG. 4 another embodiment of the present invention relating to the arrangement of magnets on the rotor core 5 will be described.
  • rotor slots 4 are formed in the rotor core 5 at intervals of 90 degrees, but the position and quantity of the rotor slots 4 are not limited to this.
  • a slot group composed of three rotor slots 4 arranged so as to form a substantially triangular shape is arranged at intervals of 90 degrees.
  • Each rotor slot 4 is embedded with the same split piece 2 as in the embodiment of FIG. 1 to constitute a permanent magnet composite 20.
  • the direction of the notch 3 is set as follows.
  • the notch 3 is disposed on the second surface 20B corresponding to a position far from the stator.
  • the split piece 2 embedded in the other rotor slot 4 any orientation of the notch 3 is possible.
  • the notch 3 by arranging the notch 3 on the second surface 20B corresponding to a position far from the stator for these rotor slots 4 as well, a more favorable effect can be obtained with respect to maintaining the demagnetization resistance performance of the rotor 1.
  • FIG. 4B corresponds to a configuration in which the rotor slot 4 from the outermost periphery of each slot group is omitted from the magnet arrangement of FIG. 4A.
  • the split piece 2 embedded in each rotor slot 4 is arranged so that the notch 3 comes to the second surface 20B far from the stator of the rotor slot 4.
  • FIG. 4C corresponds to a structure in which a smaller rotor slot 4 is formed in parallel outside the rotor slot 4 of the embodiment of FIG.
  • the notch 3 of the split piece 2 of the permanent magnet embedded in the outer rotor slot 4 is provided on the second surface 20B facing the central axis O. With respect to the split piece 2 of the permanent magnet embedded in the inner rotor slot 4, any orientation of the notch 3 is possible.
  • the shape of the transverse section of the split piece 2 cut in parallel with the split section is a rectangle.
  • the cross-sectional shape of the split piece 2 is not limited to a rectangle.
  • Various cross-sectional shapes such as a trapezoid shown in FIG. 5A and a kamaboko shape shown in FIG. 5B can be adopted.
  • the notch 3 is formed in a direction orthogonal to the central axis O.
  • the rotor structure and the rotor manufacturing method according to the present invention are not limited to the direction in which the notch 3 is formed.
  • the direction of the notch 3 can be set obliquely with respect to the central axis O.
  • the notch 3 is formed by laser irradiation, and a heat affected zone is formed in the notch 3 in addition to the coercive force lowering portion.
  • the present invention exerts a remarkable effect in preventing the demagnetization resistance of the rotor having the notched portion 3 in which the heat affected zone is formed in addition to the coercive force lowered portion.
  • a favorable effect can be obtained in preventing a decrease in the anti-demagnetization performance of the rotor caused by the coercive force reduction portion.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Permanent Field Magnets Of Synchronous Machinery (AREA)

Abstract

La présente invention porte sur un noyau de rotor qui est disposé à l'intérieur d'un stator et qui a un axe central et des fentes de rotor à l'intérieur du noyau de rotor parallèle à l'axe central. Un corps composite d'aimant permanent avec des encoches est construit par agencement de manière adjacente d'une pluralité d'éléments d'aimant permanent à l'intérieur d'une fente de rotor respective. Le corps composite d'aimant permanent à l'intérieur de la fente de rotor a une première surface et une seconde surface qui est positionnée plus loin du stator que la première surface. L'encoche est disposée sur la seconde surface pour empêcher une dégradation de résistance à une démagnétisation qui est due à l'encoche.
PCT/JP2013/071457 2012-08-21 2013-08-08 Structure de rotor et procédé de fabrication de rotor pour machine électrique tournante de type à aimant permanent WO2014030547A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2012182715 2012-08-21
JP2012-182715 2012-08-21

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WO2014030547A1 true WO2014030547A1 (fr) 2014-02-27

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3457535A1 (fr) * 2017-09-15 2019-03-20 Siemens Gamesa Renewable Energy A/S Aimant permanent pour machine à aimant permanent
WO2024042731A1 (fr) 2022-08-25 2024-02-29 株式会社 東芝 Rotor à aimant intérieur et machine électrique tournante à aimant intérieur

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011013209A1 (fr) * 2009-07-29 2011-02-03 トヨタ自動車株式会社 Appareil permettant de manipuler un aimant et procédé permettant de manipuler un aimant
JP2011125105A (ja) * 2009-12-09 2011-06-23 Toyota Motor Corp 割断磁石を備えたモータとその製造方法
WO2012105006A1 (fr) * 2011-02-02 2012-08-09 トヨタ自動車株式会社 Aimant permanent, rotor ou stator de moteur et machine dynamo-électrique

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011013209A1 (fr) * 2009-07-29 2011-02-03 トヨタ自動車株式会社 Appareil permettant de manipuler un aimant et procédé permettant de manipuler un aimant
JP2011125105A (ja) * 2009-12-09 2011-06-23 Toyota Motor Corp 割断磁石を備えたモータとその製造方法
WO2012105006A1 (fr) * 2011-02-02 2012-08-09 トヨタ自動車株式会社 Aimant permanent, rotor ou stator de moteur et machine dynamo-électrique

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3457535A1 (fr) * 2017-09-15 2019-03-20 Siemens Gamesa Renewable Energy A/S Aimant permanent pour machine à aimant permanent
CN109510329A (zh) * 2017-09-15 2019-03-22 西门子歌美飒可再生能源公司 用于永磁电机的永磁体
US11004586B2 (en) 2017-09-15 2021-05-11 Siemens Gamesa Renewable Energy A/S Permanent magnet for a permanent magnet machine
CN109510329B (zh) * 2017-09-15 2021-11-02 西门子歌美飒可再生能源公司 用于永磁电机的永磁体及其制造方法
WO2024042731A1 (fr) 2022-08-25 2024-02-29 株式会社 東芝 Rotor à aimant intérieur et machine électrique tournante à aimant intérieur

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