WO2015050010A1 - Noyau de rotor, rotor et machine électrique rotative - Google Patents

Noyau de rotor, rotor et machine électrique rotative Download PDF

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Publication number
WO2015050010A1
WO2015050010A1 PCT/JP2014/074982 JP2014074982W WO2015050010A1 WO 2015050010 A1 WO2015050010 A1 WO 2015050010A1 JP 2014074982 W JP2014074982 W JP 2014074982W WO 2015050010 A1 WO2015050010 A1 WO 2015050010A1
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WO
WIPO (PCT)
Prior art keywords
rotor core
rotor
shaft
fitting portion
fitting
Prior art date
Application number
PCT/JP2014/074982
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English (en)
Japanese (ja)
Inventor
憲生 竹田
良司 小林
博光 岡本
Original Assignee
日立オートモティブシステムズ株式会社
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 日立オートモティブシステムズ株式会社 filed Critical 日立オートモティブシステムズ株式会社
Publication of WO2015050010A1 publication Critical patent/WO2015050010A1/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
    • H02K1/28—Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K15/00—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
    • H02K15/02—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies

Definitions

  • the present invention relates to a rotor core, a rotor, and a rotating electrical machine.
  • the rotor of a rotating electrical machine is mainly composed of a rotor core in which electromagnetic steel plates are laminated in the axial direction and a shaft fastened to the rotor core.
  • Patent Document 1 a plurality of protrusions (press-fit portions 31 in FIG. 6) are formed at predetermined intervals in the circumferential direction of the circumferential surface of the center hole of the rotor core.
  • the cross-sectional shape of the central hole of the rotor core into which the cylindrical shaft is inserted is a square (hole 170 in FIG. 8), a regular triangle (hole 170 in FIG. 19), or the like.
  • a rotor core according to the invention of claim 1 includes a center hole into which a cylindrical shaft is press-fitted, and a plurality of fitting portions formed in the circumferential direction in the center hole. Is brought into contact with the shaft when it is press-fitted into the center hole, and the distal end shape of the fitting portion is characterized in that the circumferential dependency of the pressure due to contact with the shaft is substantially uniform.
  • a rotor according to an eighth aspect of the present invention includes a rotor iron core and a shaft that is press-fitted into a central hole of the rotor iron core, and is provided rotatably on the inner peripheral side of the stator. 8.
  • a rotating electric machine is configured, and a plurality of fitting portions that are fitted to the peripheral surface of the shaft are formed in the center hole of the rotor core, and the rotor core is defined in any one of claims 1 to 7. It is a rotor core as described.
  • a rotating electrical machine according to the invention of claim 9 includes a stator having slots and teeth, and windings wound around the teeth, and a rotor core provided rotatably on the inner peripheral side of the stator.
  • a rotor in which a shaft is press-fitted into the center hole of the rotor, and a plurality of fitting portions that fit into the peripheral surface of the shaft are formed in the center hole of the rotor core. It is a rotor as described in above.
  • the rotor core By using the rotor core according to the present invention, it is possible to provide a rotor core, a rotor, and a rotating electrical machine that achieve both high speed and strength reliability.
  • the figure which shows the structure of the rotary electric machine 100 of this invention The perspective view which shows the rotor 20 of 1st Embodiment. A radial direction sectional view of rotor 20 of a 1st embodiment. A radial direction sectional view of rotor core 2 of a 1st embodiment. Radial direction sectional drawing which shows the part for 45 degrees of circumferential directions among the rotor cores 2 of 1st Embodiment. Radial direction sectional drawing of the fitting part 8 vicinity of the rotor core 2 of 1st Embodiment. The figure which shows the pressure distribution of the front-end
  • FIG. Radial direction sectional drawing of 2 A of rotor cores. Radial direction sectional drawing of the rotor core 2B. The figure which shows the pressure fluctuation of the fitting part 8 by the centrifugal force in 2 A of rotor cores, and the rotor core 2B. Radial direction sectional drawing of the rotor core 2C. The figure which shows the pressure distribution of the fitting part 8 in the rotor core 2A and the rotor core 2C. Radial direction sectional drawing of the rotor core 2 of 2nd Embodiment. It is sectional drawing of the rotor core 2 of 3rd Embodiment.
  • the present invention As an example of the rotating electrical machine according to the present invention, an application example in an 8-pole 12-slot concentrated winding permanent magnet synchronous motor will be described. However, the present invention is not limited to this, and can be applied to other types of motors. The present invention can also be applied to a generator or the like.
  • FIG. 1 is a radial cross-sectional view showing a rotating electrical machine 100 according to the first embodiment.
  • the rotating electrical machine 100 includes a rotor 20 and a stator 30 disposed on the outer peripheral side of the rotor 20.
  • Reference numeral 1 denotes the rotation center of the rotating electrical machine 100, that is, the rotation axis.
  • the rotor 20 is inserted into the rotor core 2, the columnar shaft 5 that is press-fitted into the center hole 6 of the rotor core 2, and the magnet insertion hole 3 that is formed in the circumferential direction on the outer periphery side of the rotor core 2.
  • the permanent magnet 21 is provided.
  • the fitting portions 8 of the center hole 6 of the rotor core 2 are formed in the center hole 6 at equal intervals in the circumferential direction as well shown in FIGS. 3 to 5 and protrude toward the inner peripheral side. Has a shape.
  • the shaft 5 abuts on the tip 9 of the fitting portion 8, and the rotor core 2 and the shaft 5 are fastened.
  • the shaft 5 and the fitting portion 8 abut against each other and elastically deform together, but the fitting portion 8 has a greater degree of elastic deformation than the shaft 5.
  • the lightening holes 4 are formed at equal intervals in the circumferential direction in a region where the influence of the magnetic flux of the rotor core 2 does not reach.
  • the permanent magnet 21 a neodymium magnet, a samarium cobalt magnet, a ferrite magnet, or the like is mainly used, but other than these may be used.
  • the stator 30 includes a tooth 31 formed in the inner circumferential side circumferential direction, a slot 32 formed between the pair of teeth 31, and a winding 33 inserted into the slot 32 and wound around the tooth 31. Yes. Winding 33 is connected to a power converter (not shown).
  • the rotor 20 of the rotating electrical machine 100 is driven to rotate when a three-phase alternating current is applied to the winding 33 of the stator 30 from a power converter (not shown).
  • the stator 30 is the same in various types of rotating electrical machines to which the present invention is applied. Therefore, hereinafter, the description will be made with the stator 30 omitted.
  • FIG. 2 is a perspective view showing the rotor 20.
  • FIG. 3 is a radial cross-sectional view of the rotor 20.
  • FIG. 4 is a radial cross-sectional view of the rotor core 2.
  • the fitting portions 8 of the rotor core 2 are formed in the center hole 6 at equal intervals in the circumferential direction and have a shape protruding toward the inner peripheral side (FIGS. 3 and 4).
  • pressure refers to a radial force per unit area.
  • pressure distribution refers to the circumferential direction dependency of the pressure applied to the tip 9. The same applies to the following.
  • the radius of curvature of the tip 9 of the fitting portion 8 and the radius of the shaft are expressed by the shape before press-fitting. This is because it is convenient when discussing the radius of curvature of the tip 9 of the fitting portion 8 and the radius of the shaft. In the shape after press-fitting, both the fitting portion 8 and the shaft are elastically deformed, and the above discussion becomes difficult.
  • FIG. 5 is an enlarged view of a region 11 surrounded by a broken line shown in FIG. 4, that is, a 45 ° circumferential direction of the rotor core 2.
  • the left end in the figure is point A
  • the right end in the figure is point B
  • the middle point thereof is point C.
  • the shape of the tip 9 of the fitting portion 8 before the shaft 5 is press-fitted is an arc having a curvature radius rc.
  • the radius of the shaft before press-fitting is Rs and the allowance due to press-fitting is ⁇ R
  • the distance from the center C of the arc to the rotation axis 1 is Rs ⁇ R in the state before press-fitting.
  • FIG. 6 is an enlarged view of the vicinity of the fitting portion 8.
  • the fitting portion 8 is formed in the center hole 6 of the rotor core 2 and has a shape protruding toward the inner peripheral side, and has a tip 9 formed on the inner peripheral side and a side surface 15 facing the circumferential direction. .
  • the tip 9 contacts the shaft 5.
  • An arc 10 having a radius Rs ⁇ R is indicated by a broken line.
  • the arc 10 is formed around the rotation axis 1.
  • the radius of curvature rc of the tip 9 of the fitting portion 8 of the rotor core 2 of the first embodiment is larger than Rs ⁇ R. That is, rc> Rs ⁇ R.
  • FIG. 7 shows the pressure applied to the tip 9 of the fitting portion 8 by the magnitude relationship between the radius of curvature rc of the tip 9 of the fitting portion 8 and the distance Rs ⁇ R from the point C of the tip 9 before press-fitting to the rotating shaft 1. It shows how the distribution changes.
  • the vertical axis represents pressure
  • the horizontal axis represents the position of the tip 9 of the fitting portion 8.
  • the rotor core 2 of the first embodiment satisfies rc> Rs ⁇ R.
  • the curvature radius rc of the tip 9 is larger than Rs ⁇ R and set to an appropriate value (rc> Rs ⁇ R), so that the point A of the tip 9 and The pressure generated at point B is reduced, and the pressure can be made substantially uniform at points A, B, and C of the tip 9.
  • T f r (1) f ⁇ N ⁇ p L 1 L 2 (2) p ⁇ y (3)
  • T is the torque
  • f is a frictional force applied to all the fitting portions 8 of the rotor core 2
  • r is the radius of the shaft when pressed into the rotor core 2
  • N is the number of fitting portions 8 (eight in the rotor core 2 of the first embodiment)
  • ⁇ is the coefficient of static friction
  • p is the radial pressure received from the shaft 5
  • L 1 is the circumferential length of the tip 9 of each fitting portion 8 when elastically deformed by the pressure from the shaft 5
  • L 2 is the thickness of the rotor core 2
  • ⁇ y is the yield stress of the material constituting the rotor core 2, It is.
  • FIG. 8 is a diagram showing the force that the tip 9 of the fitting portion 8 of the rotor core 2 receives from the shaft 5 when the shaft 5 (not shown) is press-fitted into the rotor core 2.
  • f, r, ⁇ , p, L 1 and ⁇ y are shown.
  • the fitting portion 8a is located on the radially inner side of the lightening hole 4a” is an area indicated by an angle ⁇ 1 that is sandwiched between the line segment 41 and the line segment 42 that are in contact with the lightening hole 4a through the rotation axis 1. And it means that the fitting part 8a is located in the area
  • the fitting portion 8 is positioned on the radially inner side of the lightening hole 4. .
  • the radius of curvature rc of the tip 9 is larger than Rs ⁇ R, but in the following, instead of the rotor core 2 of the first embodiment, the tip 9 of the fitting portion 8 A rotor core 2A (FIG. 9), which is a rotor core having the same radius of curvature rc and Rs ⁇ R, is used as a reference.
  • the only difference between the rotor core 2A and the rotor core 2 of the first embodiment is whether or not the radius of curvature rc of the tip 9 is equal to Rs- ⁇ R, and the other configurations are the same.
  • a rotor core 2B (FIG. 10) and a rotor core 2C (FIG. 12) described later are introduced.
  • the fitting portions 8 are formed at equal intervals in the circumferential direction.
  • the lightening holes 4 are also formed at equal intervals in the circumferential direction.
  • the definitions of the points A, B, and C at the tip 9 of the fitting portion 8 are the same as those of the rotor core 2 of the first embodiment. (See FIGS. 5, 9, 10, and 12).
  • FIG. 9 shows the rotor core 2A.
  • FIG. 10 shows the rotor core 2B.
  • the number of the hollow holes 4 and the fitting portions 8 are equal, and each is eight. Needless to say, the specific number of eight is one example in which the number of the lightening holes 4 and the fitting portions 8 are equal. The same applies to the following.
  • the fitting portion 8 is located between the lightening holes 4.
  • the lightening holes 4 b and 4 c which are the lightening holes 4 adjacent to each other of the rotor core 2 shown in FIG. A description will be given by taking a fitting portion 8b which is one of the fitting portions 8 as an example.
  • between the lightening holes 4 means between the lightening holes 4 adjacent to each other (here, between the lightening holes 4b and 4c).
  • the fitting portion 8b is located between the lightening holes 4 means an angle between the line segment 43 passing through the rotation axis 1 and contacting the lightening hole 4b and the line segment 44 contacting the lightening hole 4c. This means that the fitting portion 8b is located in the region indicated by ⁇ 2 and in the region on the inner peripheral side of the lightening holes 4b and 4c. The same applies to the following.
  • the circumferential center 12 of the lightening holes 4 and the circumferential center 13 of the fitting portion do not coincide.
  • the curvature radius rc and Rs ⁇ R of the tip 9 of the fitting portion 8 are set to be equal in the rotor core 2 B as well as the rotor core 2 A.
  • FIG. 11 is a diagram illustrating the circumferential dependence of pressure fluctuations of the fitting portion 8 due to centrifugal force in each of the rotating electrical machine 100 using the rotor core 2A and the rotating electrical machine 100 using the rotor core 2B.
  • the vertical axis represents pressure fluctuation due to centrifugal force
  • the horizontal axis represents the position of the tip 9 of the fitting portion 8.
  • two broken lines are drawn, and the pressure distribution at the tip 9 of the fitting portion 8 of the rotor core 2A (line connecting white circles) and the rotor core 2B (line connecting white squares) is shown. ing.
  • the number of the lightening holes 4 and the fitting portions 8 are equal, and both are eight (see FIG. 4).
  • FIG. 13A two of the eight equivalent fitting portions 8 included in the rotor core 2A shown in FIG. 9 are denoted with the fitting portions 8a and 8b. Reworked.
  • the number of the fitting portions 8 and the number of the hollow holes 4 are different. Specifically, ten fitting portions 8 and eight lightening holes 4 are formed.
  • three of the ten fitting portions 8 included in the rotor core 2C shown in FIG. 12 include three fitting portions 8c, fitting portions 8d, and fitting portions.
  • the code was re-assigned to 8e.
  • the entire fitting portion 8 c is located on the radially inner side of the lightening hole 4.
  • about half of the point A side is located on the radially inner side of the lightening hole 4, and about half of the point B side is located between the lightening holes 4.
  • the entire fitting portion 8 e is located between the lightening holes 4.
  • the non-equivalence of the fitting portions 8c to 8e as described above affects the pressure distribution at the tip 9 of the fitting portion 8 that contacts the shaft 5. Details will be described later with reference to FIG.
  • FIG. 13A shows the pressure distribution at the tip 9 of the fitting portion 8 of the rotor core 2 that contacts the shaft 5 and the pressure distribution in the rotating electrical machine 100 using the rotor core 2A shown in FIG. It is the figure which showed the fitting part dependence.
  • the vertical axis represents pressure
  • the horizontal axis represents the position of the tip 9 of the fitting portion 8.
  • FIG. 13A shows two broken lines. This shows the pressure distribution at the tip 9 of the fitting part 8a (line connecting white circles) and the fitting part 8b (line connecting black circles) which are the fitting parts 8 of the rotor core 2A shown in FIG. Yes.
  • FIG. 13B shows a fitting portion 8c, a fitting portion 8d, which is a fitting portion 8 of the rotor core 2 that comes into contact with the shaft 5, in the rotating electrical machine 100 using the rotor core 2C shown in FIG. It is the figure which showed the pressure distribution in each front-end
  • the vertical axis represents pressure
  • the horizontal axis represents the position of the tip 9 of the fitting portion 8.
  • FIG. 13B shows three broken lines. This includes a fitting portion 8c (line connecting white circles), a fitting portion 8d (line connecting black circles), and a fitting portion 8e (white squares) which are the fitting portions 8 of the rotor core 2C shown in FIG.
  • the pressure distribution at the tip 9 of the connected line is shown. Since the above-mentioned three broken lines indicating the pressure distribution at the respective tips 9 of the fitting portions 8c to 8e do not overlap, it can be seen that the pressure distributions are not equal in the fitting portions 8c to 8e. This is because the number of the fitting portions 8 of the rotor core 2C is different from that of the lightening holes 4 and is formed at equal intervals in the circumferential direction.
  • FIG. 14 is a radial cross-sectional view of the vicinity of the fitting portion 8 of the rotor core 2 of the rotor 20 of the rotating electrical machine 100 of the second embodiment.
  • the tip 9 of the fitting portion 8 is an arc.
  • a notch 14 is formed in the circumferential side surface 15 of the fitting portion 8.
  • the curvature radius rc and the radius Rs ⁇ R of the tip 9 are made equal as described above, and the notch 14 is further provided on the side surface 15.
  • the second embodiment also has the effect of uniformizing the pressure distribution at the tip 9 of the fitting portion 8 of the rotor core 2 in contact with the shaft 5, as in the first embodiment, and is stable over a long period of time. Fastening can be realized.
  • FIG. 15 is a radial cross-sectional view of the vicinity of the fitting portion 8 of the rotor 20 of the rotating electrical machine 100 of the third embodiment.
  • tip 9 of the fitting part 8 is not a circular arc but the spline curve which satisfy
  • a point 16 that divides the tip 9 at equal intervals in the circumferential direction is considered, and the point 16 is moved in the radial direction so that the pressure distribution generated at the tip 9 by press fitting becomes uniform.
  • the tip 9 is formed by a spline curve that smoothly connects the points 16 arranged in this manner.
  • the pressure distribution at the tip 9 of the fitting portion 8 of the rotor core 2 that comes into contact with the shaft 5 is uniformed.
  • a stable fastening can be realized over a long period of time.
  • the fitting portions 8 of the rotor core 2 and the lightening holes 4 are arranged at equal intervals in the circumferential direction, but may be arranged at non-equal intervals as long as they do not contradict the gist of the present invention. Is possible.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)
  • Manufacture Of Motors, Generators (AREA)
  • Permanent Field Magnets Of Synchronous Machinery (AREA)

Abstract

La présente invention concerne un noyau de rotor qui permet d'obtenir simultanément une rotation à haute vitesse et une fiabilité de résistance, un rotor qui utilise ce noyau de rotor et une machine électrique rotative équipée de ce rotor. Ladite machine électrique rotative est équipée d'un rotor (20) qui comporte un noyau de rotor (2) et un arbre (5) ajusté avec serrage dans le noyau de rotor (2). Le noyau de rotor (2) présente des parties d'ajustement (8) destinées à être mises en contact avec l'arbre (5), ces parties d'ajustement (8) ayant à leur extrémité un rayon de courbure (rc) qui est supérieur à une valeur (Rs-ΔR) obtenue par soustraction d'une interférence d'ajustement avec serrage (ΔR) du rayon (Rs) de l'arbre (5).
PCT/JP2014/074982 2013-10-03 2014-09-22 Noyau de rotor, rotor et machine électrique rotative WO2015050010A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2013208266A JP6189699B2 (ja) 2013-10-03 2013-10-03 回転子鉄心、回転子、および、回転電機
JP2013-208266 2013-10-03

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150035390A1 (en) * 2013-08-05 2015-02-05 Nidec Sr Drives Ltd. Rotor for an electrical machine
WO2023119404A1 (fr) * 2021-12-21 2023-06-29 三菱電機株式会社 Rotor, moteur, compresseur, et dispositif à cycle de réfrigération

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Publication number Priority date Publication date Assignee Title
JP2018007380A (ja) * 2016-06-30 2018-01-11 アイシン精機株式会社 回転電機
WO2019123952A1 (fr) * 2017-12-18 2019-06-27 日本電産株式会社 Rotor et moteur
JPWO2019123950A1 (ja) * 2017-12-18 2020-12-03 日本電産株式会社 ロータおよびモータ
CN108134491B (zh) * 2017-12-22 2019-11-12 上海电机系统节能工程技术研究中心有限公司 一种永磁同步电机转子铁心设计方法
CN110661349A (zh) * 2018-06-29 2020-01-07 长城汽车股份有限公司 硅钢片和永磁电机
FR3129791B1 (fr) 2021-11-26 2024-05-31 Nidec Psa Emotors Rotor de machine électrique tournante

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JPS5846236U (ja) * 1981-09-24 1983-03-29 株式会社日立製作所 電動機回転子
JP2001186701A (ja) * 1999-12-27 2001-07-06 Matsushita Electric Ind Co Ltd 電動機の永久磁石回転子およびこれを用いた密閉型圧縮機
US6265802B1 (en) * 1996-04-15 2001-07-24 Warner Electric Technology, Inc. Laminated rotor assembly and method for a dynamoelectric machine
JP2001346346A (ja) * 2000-03-30 2001-12-14 Asmo Co Ltd ロータ及び電動機
US20070132336A1 (en) * 2005-12-08 2007-06-14 Ionel Dan M Rotor assembly for an electric machine including a vibration damping member and method of manufacturing same
JP2008278597A (ja) * 2007-04-26 2008-11-13 Mitsubishi Electric Corp ロータコア
JP2010142095A (ja) * 2008-12-15 2010-06-24 Mitsuba Corp 電動モータ
JP2012023823A (ja) * 2010-07-13 2012-02-02 Mitsuba Corp 回転電機の回転子

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JPS56112839A (en) * 1980-02-08 1981-09-05 Takashi Namiki Thin steel plate for rotor core of motor

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Publication number Priority date Publication date Assignee Title
JPS5846236U (ja) * 1981-09-24 1983-03-29 株式会社日立製作所 電動機回転子
US6265802B1 (en) * 1996-04-15 2001-07-24 Warner Electric Technology, Inc. Laminated rotor assembly and method for a dynamoelectric machine
JP2001186701A (ja) * 1999-12-27 2001-07-06 Matsushita Electric Ind Co Ltd 電動機の永久磁石回転子およびこれを用いた密閉型圧縮機
JP2001346346A (ja) * 2000-03-30 2001-12-14 Asmo Co Ltd ロータ及び電動機
US20070132336A1 (en) * 2005-12-08 2007-06-14 Ionel Dan M Rotor assembly for an electric machine including a vibration damping member and method of manufacturing same
JP2008278597A (ja) * 2007-04-26 2008-11-13 Mitsubishi Electric Corp ロータコア
JP2010142095A (ja) * 2008-12-15 2010-06-24 Mitsuba Corp 電動モータ
JP2012023823A (ja) * 2010-07-13 2012-02-02 Mitsuba Corp 回転電機の回転子

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150035390A1 (en) * 2013-08-05 2015-02-05 Nidec Sr Drives Ltd. Rotor for an electrical machine
WO2023119404A1 (fr) * 2021-12-21 2023-06-29 三菱電機株式会社 Rotor, moteur, compresseur, et dispositif à cycle de réfrigération

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