WO2021038956A1 - 回転子 - Google Patents

回転子 Download PDF

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Publication number
WO2021038956A1
WO2021038956A1 PCT/JP2020/017268 JP2020017268W WO2021038956A1 WO 2021038956 A1 WO2021038956 A1 WO 2021038956A1 JP 2020017268 W JP2020017268 W JP 2020017268W WO 2021038956 A1 WO2021038956 A1 WO 2021038956A1
Authority
WO
WIPO (PCT)
Prior art keywords
rotor
permanent magnet
axis
insertion holes
magnet insertion
Prior art date
Application number
PCT/JP2020/017268
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
駿 上野
Original Assignee
株式会社明電舎
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 株式会社明電舎 filed Critical 株式会社明電舎
Priority to CN202080059249.3A priority Critical patent/CN114270663B/zh
Publication of WO2021038956A1 publication Critical patent/WO2021038956A1/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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/64—Electric machine technologies in electromobility

Definitions

  • the present invention relates to a motor for an electric vehicle (EV, HEV, PHEV, etc.), particularly a rotor of a permanent magnet motor provided with multiple layers of permanent magnets.
  • a motor for an electric vehicle EV, HEV, PHEV, etc.
  • a rotor of a permanent magnet motor provided with multiple layers of permanent magnets.
  • Patent Document 1 a method for reducing the noise of a motor in which permanent magnets are arranged in multiple layers, for example, a method in which the width between the permanent magnets is equal to or larger than the opening width of the slot of the stator is adopted.
  • one aspect of the present invention is a rotor of a permanent magnet motor, which penetrates the iron core of the rotor from one end face to the other end face in the same direction as the motor shaft of the permanent magnet motor.
  • a pair of permanent magnet insertion holes are formed in which the d-axis of the rotor is arranged line-symmetrically, and the pair of permanent magnet insertion holes are arranged and formed in a plurality of layers from the outer peripheral side of the rotor to the axis.
  • the pair of permanent magnet insertion holes on the outer peripheral side extend from the end of the pair of permanent magnet insertion holes on the q-axis side of the rotor to the d-axis side along the outer circumference of the rotor and from one end of the iron core to the other.
  • a first magnetic blocking portion is formed over the end in the same direction as the motor shaft, and the first magnetic blocking portion is formed in a range of 14 ° to 46 ° in electrical angle from the d-axis. There is.
  • the rotor in the rotor, at the q-axis side end portion of the pair of permanent magnet insertion holes formed in a plurality of layers on the axial center side of the pair of permanent magnet insertion holes on the outer peripheral side.
  • a second magnetic blocking portion forming a concentric arc centered on the outer diameter side end on the d-axis of the rotor is further formed.
  • the length of the cross section of the permanent magnet inserted into the permanent magnet insertion hole in the longitudinal direction becomes longer from the outer peripheral side to the axial center side of the rotor.
  • the V-shaped arrangement angle of the permanent magnets inserted into the pair of permanent magnet insertion holes decreases from the outer peripheral side to the axial center side of the rotor.
  • the permanent magnets arranged on the axis side are divided into a plurality of parts, and each of the divided permanent magnets has an outer diameter side end on the d-axis of the rotor. Placed concentrically in the center.
  • a cross-sectional view of the rotor orthogonal to the axial direction of the rotor which is one aspect of the present invention.
  • Gap magnetic flux density waveform diagram of the rotor of FIG. 1 having a magnetic barrier The characteristic diagram which showed the change of the harmonic component of the rotor of FIG.
  • the characteristic diagram which showed the change of the torque ripple of the rotor of FIG. The enlarged view of the peripheral part of the slit of FIG. Explanatory drawing which showed the range of the slit of FIG.
  • a cross-sectional view of the rotor orthogonal to the axial direction of the rotor which is one aspect of the present invention.
  • a cross-sectional view of the rotor orthogonal to the axial direction of the rotor which is one aspect of the present invention.
  • a cross-sectional view of the rotor orthogonal to the axial direction of the rotor which is one aspect of the present
  • FIG. 1 shows a structure of a cross section orthogonal to the axial direction of a rotor 1 of a permanent magnet motor, which is one aspect of the present invention.
  • FIG. 1 shows a structure of a cross section orthogonal to the axial direction of a rotor 1 of a permanent magnet motor, which is one aspect of the present invention.
  • only one main magnetic pole of the rotor 1 is shown, and the other main magnetic poles have the same configuration as the main magnetic poles and are not shown.
  • the permanent magnet motor includes a rotor 1 and a stator 2 coaxially arranged around the rotor 1.
  • a plurality of status lots 22 on which the stator coil 21 is mounted are arranged and formed on the stator 2 at equal intervals along the outer circumference of the rotor 1.
  • the iron core 10 of the rotor 1 is a substantially cylindrical member formed by laminating silicon steel plates.
  • a motor shaft 11 is fitted in the shaft core portion of the iron core 10, and the motor shaft 11 is rotatably supported by a bearing (not shown).
  • the iron core 10 is located at the center position between the axis of the rotor 1 (motor shaft 11) in FIG. 1 and the center of an arbitrary main magnetic pole (for example, a pair of permanent magnets 13a, 13b (15a, 15b)) that generate magnet torque. ) Is the axis indicated by the straight line d in FIG. 7, which is the d-axis of the dq-axis coordinates. Further, of the iron core 10, the permanent magnets 13a, 13b (15a, 15b) of the main magnetic poles for one magnetic pole and the permanent magnets 13a, 13b (15a, 15b) of the main magnetic poles adjacent to the main magnetic pole in the circumferential direction are used.
  • the iron core between them becomes the auxiliary magnetic pole portion 16 that generates the reactorance torque.
  • the axis indicated by the straight line q in the figure connecting the axis of the rotor 1 (motor shaft 11) and the central axis of the auxiliary magnetic pole portion 16, that is, the axis orthogonal to the d-axis in terms of electrical angle is dq. It is the q-axis of the axis coordinates.
  • Permanent magnet insertion holes 12a, 12b, 14a, 14b As shown in FIG. 1, a pair of permanent magnet insertion holes are formed in the main magnetic pole in a V shape on the outer peripheral side and the axial center side of the rotor 1, so that two permanent magnets, which will be described later, are formed. Arranged in layers.
  • a pair of permanent magnet insertion holes 12a and 12b are formed so as to penetrate the iron core 10 in the same direction as the motor shaft 11 from one end face of the iron core 10 to the other end face. ing.
  • the permanent magnet insertion holes 12a and 12b are arranged and formed at equal intervals along the circumferential direction of the iron core 10.
  • the pair of permanent magnet insertion holes 14a and 14b penetrate the iron core 10 in the same manner as the permanent magnet insertion holes 12a and 12b. It is formed like this.
  • the permanent magnet insertion holes 14a and 14b are formed to have a longer diameter than the permanent magnet insertion holes 12a and 12b.
  • the permanent magnet insertion holes 12a and 12b are also arranged and formed at equal intervals along the circumferential direction of the iron core 10.
  • the permanent magnet insertion holes 12a, 12b, 14a, 14b are formed in a V shape in which the d-axis of the rotor 1 is line-symmetrical and the arrangement angle becomes wider as it approaches the outer circumference of the rotor 1.
  • the V-shaped arrangement angle of the permanent magnet insertion holes 14a and 14b on the axial center side is set to be smaller than the arrangement angle of the permanent magnet insertion holes 12a and 12b on the outer peripheral side.
  • Permanent magnets 13a, 13b, 15a, 15b By inserting the long plate-shaped permanent magnets 13a and 13b along the axial direction of the rotor 1 into the permanent magnet insertion holes 12a and 12b, a pair of permanent magnets 13a and 13b are formed along the circumferential direction of the iron core 10. It is arranged in a V shape.
  • the long plate-shaped permanent magnets 15a and 15b along the axial direction of the rotor 1 into the permanent magnet insertion holes 14a and 14b, a pair of permanent magnets 15a and 15b are inserted on the axial side of the iron core 10.
  • the length L2 in the longitudinal direction of the cross section of the permanent magnets 15a and 15b is set longer than the length L1 in the longitudinal direction of the cross section of the permanent magnets 13a and 13b.
  • the rotor 1 has a pair of permanent magnets arranged in a two-layer structure.
  • the outer peripheral magnetic pole surfaces 13ou and 15ou of the permanent magnets 13a, 13b, 15a and 15b shown in FIG. 7 have the same magnetic polarity (S pole or N pole).
  • S pole or N pole the same magnetic polarity
  • one main magnetic pole is formed by the permanent magnets 13a, 13b, 15a, 15b.
  • Magnetic cutoffs 17a, 17b As shown in FIGS. 1 and 6, the end of the permanent magnet insertion hole 12a on the q-axis side extends toward the d-axis along the outer circumference and is the same as the motor shaft 11 from one end to the other end of the iron core 10.
  • a magnetic blocking portion 17a (first magnetic blocking portion) penetrating in the direction is formed.
  • the end of the permanent magnet insertion hole 12b on the q-axis side also extends line-symmetrically with the magnetic blocking portion 17a around the d-axis toward the d-axis side along the outer circumference and extends from one end to the other end of the iron core 10.
  • a magnetic blocking portion 17b (first magnetic blocking portion) penetrating in the same direction as the motor shaft 11 is formed.
  • the magnetic blocking portions 17a and 17b are formed so that the electric angle A from the d-axis shown in FIG. 7 falls within the range of 14 ° to 46 °. Since the magnetic blocking portions 17a and 17b are holes (spaces), the magnetic permeability is extremely small as compared with the iron core 10, and the magnetic flux is extremely difficult to pass through, so that the magnetic blocking portions 17a and 17b function as magnetic blocking portions. Even if the holes (spaces) forming the magnetic blocking portions 17a and 17b are filled with a non-magnetic metal having a low magnetic permeability (for example, aluminum or brass), an adhesive, a varnish, a resin, or the like. It is still a magnetic blocker.
  • a non-magnetic metal having a low magnetic permeability for example, aluminum or brass
  • the magnetic blocking portions 17a and 17b are formed between the d-axis and the q-axis of the rotor 1, so that the permanent magnets 13a and 13b form the outer peripheral surface of the rotor 1.
  • the change in the generated magnetic flux density distribution, particularly the magnetic flux density distribution at both ends in the circumferential direction of the main magnetic pole, can be made closer to a sinusoidal wave.
  • the torque ripple and the electromagnetic excitation force of the rotor 1 can be effectively reduced, and the noise and vibration of the permanent magnet motor can be further reduced.
  • the magnetic blocking portions 17a and 17b are formed so that the electric angle A is within the range of 14 ° to 46 ° from the d-axis, the magnet magnetic flux of the rotor 1 in the range is suppressed, so that the rotor
  • the magnetic flux density distribution on the circumference of the gap between the outer periphery of 1 and the magnetic blocking portions 17a and 17b becomes close to a sinusoidal shape. Therefore, the torque ripple and the electromagnetic excitation force are reduced, and vibration and noise can be further reduced.
  • the electric angle A to the range of about 46 ° (for example, the range of the first and second status lots 22 from the d-axis shown in FIG. 6), the second from the magnetic flux center (d-axis). Since the magnetic flux of the magnet of the teeth 23 is suppressed and the magnetic path width can be secured, the torque is also improved. Further, the 13th harmonic of the radial component of the magnetic flux density distribution is also suppressed.
  • FIG. 2 shows the waveform of the gap magnetic flux density of the conventional rotor 1 shown in FIG. 10 which does not have the magnetic blocking portions 17a and 17b.
  • FIG. 3 shows a waveform of the gap magnetic flux density of the rotor 1 having the magnetic blocking portions 17a and 17b.
  • the characteristic diagram of FIG. 3 shows a waveform of the gap magnetic flux density when the electric angle A from the d-axis to the d-axis side end of the magnetic blocking portion 17a is 16 °.
  • the gap magnetic flux density is close to a sinusoidal shape with the magnetic flux densities of the electric angles A around 60 ° and 120 ° reduced. This tendency was particularly remarkable in the range of the electric angle A from the d-axis of the magnetic blocking portions 17a and 17b in the range of 14 ° to 46 °.
  • FIG. 4 shows the change in the electric angle A to the d-axis side end of the rotor 1 and the harmonic component of the gap magnetic flux density waveform
  • the magnetic blocking portion according to the present invention has the same tendency even if the magnetic blocking portion has two or more layers, for example, a three-layer structure described later, if the magnetic blocking portion on the outermost peripheral side is in the same range as above.
  • the arrangement state of the permanent magnets 13a, 13b, 15a, 15b is not limited to the above-mentioned "V-shaped” arrangement, but is "inverted V-shaped", “U-shaped”, “arch-shaped”, and “trapezoidal". , Etc., the same effect can be obtained.
  • the rotor 1 of the second embodiment illustrated in FIG. 8 is located on the q-axis side of the pair of permanent magnets arranged in a plurality of layers on the axial center side of the pair of permanent magnets 13a and 13b on the outermost peripheral side.
  • Magnetic blocking portions 18a, 18b, 32a, 32b (second magnetic blocking portions) forming concentric arcs centered on the outer diameter side end E on the d-axis are formed.
  • a pair of permanent magnets are arranged in three layers. That is, the permanent magnet insertion holes 12a and 12b, the permanent magnet insertion holes 14a and 14b, and the permanent magnet insertion holes 30a and 30b sequentially form the d-axis of the rotor 1 line-symmetrically and linearly from the outer peripheral side to the axis of the rotor 1. , The arrangement is formed in a V shape in which the arrangement angle becomes wider as it approaches the outer circumference of the rotor 1.
  • the permanent magnet insertion holes 30a and 30b are formed in an arc longer than the permanent magnet insertion holes 14a and 14b.
  • the permanent magnets 13a, 13b, the permanent magnets 15a, 15b and the permanent magnets 31a, 31b are inserted into the permanent magnet insertion holes 12a, 12b, the permanent magnet insertion holes 14a, 14b, and the permanent magnet insertion holes 30a, 30b, respectively.
  • Permanent magnets 13a, 13b, 15a, 15b, 31a, 31b are arranged in a pair in a V shape on the axial center side. As shown in FIG. 8, the length L3 in the longitudinal direction of the cross section of the permanent magnets 31a and 31b is set longer than the length L2 in the longitudinal direction of the cross section of the permanent magnets 15a and 15b. ..
  • the rotor 1 has a pair of permanent magnets arranged in a three-layer structure.
  • the permanent magnet insertion holes 14a and 14b extend from one end to the other end of the iron core 10 in a concentric arc centered on the d-axis outer diameter side end E of the rotor 1.
  • the magnetic blocking portions 18a and 18b are formed so as to penetrate in the same direction as the motor shaft 11.
  • the end portions of the permanent magnet insertion holes 30a and 30b on the q-axis side also extend in a concentric arc centered on the outer diameter side end portion E on the d-axis of the rotor 1 and extend from one end of the iron core 10 to the other.
  • Magnetic blocking portions 32a and 32b are formed so as to penetrate through the ends in the same direction as the motor shaft 11.
  • the magnetic blocking portions 18a, 18b, 32a, 32b are concentric arcs, so that the structure is compared with the linear barrier aspect.
  • the flow of magnetic flux becomes smooth, and the effect of improving torque and reducing loss is expected.
  • the permanent magnet can be further embedded in the inner diameter side of the rotor 1 while ensuring the magnetic path width, so that the loss of the magnet can be reduced.
  • the lengths L1, L2, and L3 in the longitudinal direction of the cross section of the permanent magnets 13a, 13b, 15a, 15b, 31a, and 31b become longer from the outer peripheral side to the axial center side of the rotor 1. As a result, the magnet torque of the rotor 1 is further improved.
  • the arrangement angles of the pair of permanent magnets 13a, 13b, 15a, 15b, 31a, 31b arranged in a V shape become smaller from the outer peripheral side to the axial center side of the rotor 1.
  • the distance between the pair of permanent magnets on the d-axis side of each layer gradually increases. As a result, the magnetic saturation generated between the layers is suppressed, and the reactance torque is improved.
  • the permanent magnets 15 arranged on the axial side of the rotor 1 are divided into a plurality of (for example, three or more), and the individual permanent magnets 15 rotate. It is preferable that the child 1 is arranged concentrically with the outer diameter side end E on the d-axis as the center.
  • the permanent magnet 15 on the axial center side is inserted into the permanent magnet insertion hole 14 arranged concentrically with respect to the outer diameter side end E on the d-axis of the rotor 1.
  • the eddy current loss of the permanent magnets 15 is further reduced by arranging the plurality of permanent magnets 15 concentrically. Then, the arrangement of the plurality of permanent magnets arranged in each layer approaches the U shape from the outer peripheral side to the axial center side of the rotor 1, so that the flow of magnetic flux becomes smooth and the reactance torque is further improved.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Permanent Field Magnets Of Synchronous Machinery (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)
PCT/JP2020/017268 2019-08-23 2020-04-21 回転子 WO2021038956A1 (ja)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202080059249.3A CN114270663B (zh) 2019-08-23 2020-04-21 转子

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2019-152735 2019-08-23
JP2019152735A JP6870708B2 (ja) 2019-08-23 2019-08-23 回転子

Publications (1)

Publication Number Publication Date
WO2021038956A1 true WO2021038956A1 (ja) 2021-03-04

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PCT/JP2020/017268 WO2021038956A1 (ja) 2019-08-23 2020-04-21 回転子

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WO (1) WO2021038956A1 (zh)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117795825A (zh) * 2021-08-23 2024-03-29 三菱电机株式会社 转子及旋转电机

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004180460A (ja) * 2002-11-28 2004-06-24 Daikin Ind Ltd ブラシレスｄｃモータおよびブラシレスｄｃモータ制御装置
JP2018148597A (ja) * 2017-03-01 2018-09-20 ダイキン工業株式会社 回転電気機械
WO2018190103A1 (ja) * 2017-04-13 2018-10-18 株式会社 東芝 回転電機の回転子

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3659055B2 (ja) * 1999-03-26 2005-06-15 日産自動車株式会社 電動機のロータ
CN104901452B (zh) * 2015-05-12 2017-10-27 上海吉亿电机有限公司 一种可用于高速场合的永磁辅助同步磁阻电机转子
CN106816976A (zh) * 2017-03-31 2017-06-09 苏州汇川联合动力系统有限公司 转子冲片、电机转子及永磁同步电机
CN108321954B (zh) * 2018-03-16 2020-10-23 珠海格力节能环保制冷技术研究中心有限公司 转子结构、永磁辅助同步磁阻电机及电动汽车

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004180460A (ja) * 2002-11-28 2004-06-24 Daikin Ind Ltd ブラシレスｄｃモータおよびブラシレスｄｃモータ制御装置
JP2018148597A (ja) * 2017-03-01 2018-09-20 ダイキン工業株式会社 回転電気機械
WO2018190103A1 (ja) * 2017-04-13 2018-10-18 株式会社 東芝 回転電機の回転子

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Publication number Publication date
JP6870708B2 (ja) 2021-05-12
CN114270663A (zh) 2022-04-01
JP2021035160A (ja) 2021-03-01
CN114270663B (zh) 2022-08-12

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