WO2019107104A1 - Machine électrique rotative, procédé de fabrication de son rotor, et dispositif auxiliaire électrique automoteur - Google Patents

Machine électrique rotative, procédé de fabrication de son rotor, et dispositif auxiliaire électrique automoteur Download PDF

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Publication number
WO2019107104A1
WO2019107104A1 PCT/JP2018/041426 JP2018041426W WO2019107104A1 WO 2019107104 A1 WO2019107104 A1 WO 2019107104A1 JP 2018041426 W JP2018041426 W JP 2018041426W WO 2019107104 A1 WO2019107104 A1 WO 2019107104A1
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WO
WIPO (PCT)
Prior art keywords
rotor
electric machine
rotor core
rotating electrical
machine according
Prior art date
Application number
PCT/JP2018/041426
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English (en)
Japanese (ja)
Inventor
裕司 辻
金澤　宏至
大祐 郡
一農 田子
貴行 近岡
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 WO2019107104A1 publication Critical patent/WO2019107104A1/fr

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    • 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

Definitions

  • the present invention relates to a rotary electric machine, a method of manufacturing the rotor thereof, and a motor auxiliary device for a motor vehicle, and more particularly to a rotary electric machine suitable for a permanent magnet disposed in a V-shaped magnet insertion hole formed in a rotor core BACKGROUND OF THE INVENTION 1.
  • Field of the Invention The present invention relates to a method of manufacturing a rotor and a motor auxiliary device for an automobile.
  • an embedded permanent magnet type rotating electrical machine is used for air gap shortening due to the absence of a stainless steel (SUS) cover for preventing scattering of permanent magnets and use of inexpensive flat magnets.
  • SUS stainless steel
  • a magnet storage hole larger than the magnet size is required, and the permanent magnet is fixed after the magnet insertion. If the rotating electrical machine is rotated without fixing the permanent magnet sufficiently, the permanent magnet may move due to the centrifugal force, which may cause vibration, noise and damage the permanent magnet.
  • the variation in the attachment position of the permanent magnet causes an increase in cogging torque and torque ripple.
  • the permanent magnet is a brittle material and easily broken due to stress concentration, its fixing method is limited.
  • a method of fixing a permanent magnet with an adhesive or a resin mold leads to an increase in cost due to an increase in direct material cost and man-hours.
  • Patent Document 1 As a fixing technique that does not use an adhesive or a resin, for example, as described in Patent Document 1, there is a technique in which the outer peripheral side bridge is pressure-formed on the magnet side and the magnet is fixed by the bridge portion. Further, as described in Patent Document 2, there is a technique of storing a nonmagnetic magnet support member in a magnet storage hole in order to fix a magnet by reducing leakage magnetic flux and improving demagnetization resistance.
  • the present invention has been made in view of the above-described point, and the object of the present invention is to suppress the cost increase due to the deterioration of the rotating electrical machine characteristics and the increase in the number of parts due to the deformation of the bridge portion, and position the permanent magnet with a simple configuration. It is an object of the present invention to provide a rotary electric machine which can be fixed and fixed, a method of manufacturing the rotor thereof, and an electric motor auxiliary apparatus for a car.
  • a rotary electric machine comprises a stator and a rotor disposed opposite to the stator with a predetermined gap, the rotor comprising a rotor core provided with V-shaped magnet storage holes;
  • a rotating electrical machine comprising a plurality of permanent magnets disposed in the V-shaped magnet storage hole of the rotor core to form one magnetic pole, wherein the permanent magnet is one of a pair of opposing side surfaces
  • the outer side contacts the bridge portion connecting the magnetic poles on the outer peripheral side, the other side surface is provided in the magnet storage hole, and contacts the protrusion integral with the rotor core, and the protrusion contacts the permanent magnet. It is characterized in that it has an urging force for pressing the bridge portion side.
  • a method for manufacturing a rotor of a rotating electrical machine includes a stator and a rotor opposed to the stator with a predetermined gap, and the rotor is a V-shaped magnet storage hole
  • the V-shaped magnet A magnetic steel sheet A punched out in a shape having a projection in the storage hole and a magnetic steel sheet B punched out in a shape without a projection in the V-shaped magnet storage hole are prepared, and the magnetic steel sheet A and the electromagnetic steel sheet B are prepared.
  • the rotor core having the protrusions attached in the vicinity of both axial ends of the V-shaped magnet housing hole is created, and then the permanent magnet is inserted into the V-shaped magnet housing hole.
  • the tip By inserting a deformation jig with a cap into the V-shaped magnet storage hole from the axial direction, the protrusion is pushed out in the circumferential direction, and the protrusion is deformed until the biasing force is generated. After completion of the deformation, the deformation jig is pulled out of the magnet storage hole.
  • a motor vehicle auxiliary device is characterized in that the rotary electric machine having the above-described configuration is mounted.
  • the present invention it is possible to suppress the cost increase due to the deterioration of the rotating electrical machine characteristics and the increase in the number of parts due to the deformation of the bridge portion, and to position and fix the permanent magnet with a simple configuration.
  • FIG. 2 is a cross-sectional view taken along line AA in FIG. It is an enlarged view of the magnetic pole part (B part of FIG. 2) of the rotor enclosed with the broken line of FIG.
  • the Example 2 of the rotary electric machine of this invention is shown, and it is an axial sectional view of a rotor.
  • It is a flowchart which shows the manufacturing method of the rotor in Example 2 of the rotary electric machine of this invention. It is the figure which showed the detail of process S2, S3, S4, S5 of the manufacturing method of the rotor in FIG. It is the figure which showed Example 3 of the rotary electric machine of this invention, and expanded 1 pole part of a rotor.
  • FIG. 10 is a view showing the fourth embodiment of the rotary electric machine according to the present invention, in which one magnetic pole portion of the rotor is enlarged;
  • FIG. 16 is a view showing the fifth embodiment of the rotating electrical machine of the present invention, in which one magnetic pole portion of the rotor is enlarged.
  • FIG. 16 shows Example 6 of the rotary electric machine of the present invention, and is a radial sectional view of a rotor in the consistent pole type rotary electric machine. It is a figure which shows the system configuration of the rotary electric machine in Example 7 of the rotary electric machine of this invention. It is a figure which shows the structure of the EPS (electric power steering) apparatus which applied the rotary electric machine of this invention as Example 8 of this invention.
  • EPS electric power steering
  • a rotary electric machine in the following embodiment is applicable also to the motor-driven power steering apparatus, and the other motor auxiliary equipment for motor vehicles.
  • the present invention is also applicable to general industrial rotating machines. In each embodiment, the same reference numeral is used for the same component.
  • FIG. 1 is an axial sectional view of a rotating electrical machine 100 according to this embodiment
  • FIG. 2 is a radial sectional view of a stator 1 and a rotor 3 when cut along the AA line in FIG.
  • the enlarged view of the magnetic pole part (B part of FIG. 2) of the rotor 3 enclosed with the broken line of 2 is shown.
  • the rotary electric machine 100 includes a stator 1, a rotor 3 rotatably disposed opposite to the stator 1 with a predetermined gap, a drive shaft 7 for rotating the rotor 3, and a stator And a frame 8 for holding one.
  • the rotor 3 described above is integrally formed with the rotor core 4, the plurality of permanent magnets 5 attached to the rotor core 4, and the rotor core 4, and a projection 12 having an urging force for pressing the permanent magnet 5 (this projection 12 is a shaft Are arranged continuously in the direction).
  • the stator 1 includes a stator core 2 and a stator coil 10 (see FIG. 2) wound around the teeth portion 11 of the stator core 2. In FIG. 1, a coil end portion 6 of the stator coil 10 is illustrated. There is.
  • the stator coil 10 is wound around the teeth portion 11 of the stator core 2.
  • the rotor 3 has a rotor core 4 provided with a V-shaped magnet housing hole 9 and a plurality of V-shaped magnet housing holes 9 arranged in a V-shape to form one magnetic pole (2 in FIG. 2).
  • the permanent magnet 5 is provided.
  • one side surface (outer diameter side surface) 14 of the pair of opposing side surfaces is in contact with the bridge portion 13 connecting the magnetic poles, and the other side surface
  • the inner diameter side face 15 is in contact with the projection 12 provided in the magnet housing hole 9, and the projection 12 has a biasing force 16 for pressing the permanent magnet 5 toward the bridge 13.
  • the permanent magnet 5 is positioned and fixed inside the magnet storage hole 9.
  • the projection 12 provided in the magnet housing hole 9 is plastically deformed by a bending stress higher than the yield point of the electromagnetic steel sheet. By doing this, the permanent magnet 5 can be pressed to the bridge portion 13 side and brought into contact with the bridge portion 13.
  • the magnet 5 can be positioned and fixed.
  • the magnetic characteristics of the protrusion 12 deteriorate, that is, the magnetic resistance becomes higher than that of the rotor core 4, and the leakage flux to the protrusion 12 can be reduced. I can expect improvement.
  • the permanent magnet 5 is particularly susceptible to breakage at the corner portions, it is desirable that the projection 12 be in contact with the central portion of the other side surface 15 of the permanent magnet 5. Therefore, the protrusion 12 has a curved structure on the outer diameter side, and the side central portion of the protrusion 12 is in contact with the other side 15 of the permanent magnet 5. Thereby, the stress concentration to the permanent magnet 5 can also be relieved.
  • the stress concentration due to the centrifugal force at the time of rotation can be alleviated by the contact of the one side surface 14 of the permanent magnet 5 with the bridge portion 13 at the surface.
  • FIG. 4 is an axial sectional view of the rotor 3 in the rotary electric machine 100 according to the second embodiment.
  • the protrusions 12 are arranged continuously in the axial direction, but in the present embodiment, the protrusions 12 are arranged at a plurality of locations in the axial direction.
  • the axial length of the protrusion 12 can be reduced, and the leakage magnetic flux to the protrusion 12 can be reduced by reducing the axial length of the protrusion 12, so that the characteristics of the rotary electric machine 100 are improved.
  • the permanent magnet 5 can be reliably positioned and fixed, and the leakage flux can be reduced to the maximum extent.
  • the protrusion 12 in the present embodiment can be disposed on the axial center side of the complete axial end of the complete rotor core 4 to prevent damage to the corner of the permanent magnet 5. That is, when the projection 12 is at the axial end of the rotor core 4, the corner of the permanent magnet 5 which is particularly susceptible to breakage is pressed, so that the projection 12 is closer to the axial end face of the complete rotor core 4. It is better to arrange in the direction center side.
  • the electromagnetic steel plate 17A punched out with the shape having the projection 12 in the magnet housing hole 9 and the electromagnetic steel plate 17B punched out with the shape without the projection 12 in the V-shaped magnet housing hole 9 are prepared (S1 in FIG. 5)
  • the rotor 3 having the protrusions 12 near the both axial end portions of the V-shaped magnet housing holes 9 is created.
  • the permanent magnet 5 is inserted into the V-shaped magnet housing hole 9 (S2 in FIGS. 5 and 6).
  • the deformation jig 18 having a tapered tip is inserted into the V-shaped magnet housing hole 9 from the axial direction 19 to push and spread the protrusion 12 in the circumferential direction, thereby plastically deform the protrusion 12
  • the permanent magnet 12 is fixed (S3, S4 in FIGS. 5 and 6).
  • the deformation jig 18 is pulled out from the magnet housing hole 9 (S5 in FIG. 5 and FIG. 6).
  • Example 3 of the rotary electric machine 100 of this invention is shown.
  • FIG. 7 is an enlarged view of one magnetic pole of the rotor 3 in the rotary electric machine 100 according to the present embodiment.
  • the bridge portion 13 connecting the magnetic poles is formed to be curved toward the protrusion 12 side (inner diameter side).
  • the rotor core 4 having the curved bridge portion 13 may be manufactured by laminating electromagnetic steel plates punched out in a shape in which the bridge portion 13 is curved.
  • Example 4 of the rotary electric machine 100 of this invention is shown.
  • FIG. 8 is an enlarged view of one magnetic pole of the rotor 3 in the rotary electric machine 100 according to the present embodiment.
  • shock-absorbing material 20 which is more elastic than a magnetic steel sheet is disposed.
  • Example 5 of the rotary electric machine 100 of this invention is shown.
  • FIG. 9 is an enlarged view of one magnetic pole of the rotor 3 in the rotary electric machine 100 according to the present embodiment.
  • the permanent magnet 5 when the permanent magnet 5 is magnetized, it is attracted to the inner wall of the magnet housing hole 9 with no gap in the magnetization direction. However, in order to securely fix the permanent magnet 5 at high rotation or when vibration is severe, it may be necessary to position and fix the permanent magnet 5 in the magnetization direction.
  • the permanent magnet 5 in addition to the configuration of the first embodiment, includes a pair of opposing side surfaces 14 and the other side surface 15 targeted in the first embodiment.
  • the pair of second side faces opposed in different directions one second side face 24 contacts the inner wall of the V-shaped magnet housing hole 9, and the other second side face 25 is V-shaped.
  • the second protrusion 12A provided in the magnet storage hole 9 and in contact with the second protrusion 12A integral with the rotor core 4 presses the permanent magnet 5 against the inner wall side of the V-shaped magnet storage hole 9. It has a power.
  • Example 6 of the rotary electric machine 100 of this invention is shown.
  • FIG. 10 shows a rotor 3 in a rotary electric machine 100 according to a sixth embodiment.
  • the rotor 3 of the present embodiment shown in FIG. 10 is a so-called so-called rotor having a rotor core 4, a plurality of permanent magnets 5, and a plurality of pseudo magnetic poles 21 made of soft magnetic material formed between magnetic poles having a pair of permanent magnets 5.
  • the present invention is applied to a constant pole type rotary electric machine.
  • the rotor 3 has a rotor core 4 provided with a V-shaped magnet housing hole 9 and a plurality of permanent magnets 5 disposed in the V-shaped magnet housing hole 9 of the rotor core 4 to form one magnetic pole.
  • the plurality of pseudo magnetic poles 21 made of soft magnetic material formed between certain magnetic poles of a pair of permanent magnets 5 includes one side surface 14 of the pair of opposite side surfaces facing each other.
  • the other side face 15 is provided in the V-shaped magnet housing hole 9 and in contact with the projection 12 integral with the rotor core 4 and the projection 12 is a permanent magnet A biasing force for pressing 5 toward the bridge portion 13 is provided.
  • the magnetic pole of the rotor 3 is a pseudo magnetic pole 21 made of soft magnetic material Since the permanent magnet 5 is used, the amount of magnet used can be reduced.
  • the rotary electric machine 100 having the above-described rotor structure may be driven by the same inverter, or may be driven by two or more inverters. When driven by two or more inverters, even when one inverter fails, the rotating electric machine 100 can be driven by the remaining inverters, which is effective from the viewpoint of failsafe in an emergency.
  • FIG. 11 shows a configuration example of a rotating electrical machine system driven by two inverters.
  • U11 to U15 phases, V11 to V15 phases, W11 to W15 are generated by the first inverter 41.
  • the phases are driven, and the U21 to U25 phases, the V21 to V25 phases, and the W21 to W25 phases are driven by the second inverter 42.
  • FIG. 12 shows the configuration of an EPS (Electric Power Steering) apparatus to which the rotary electric machine 100 described in the above-described embodiment is applied, as an eighth embodiment of the present invention.
  • EPS Electrical Power Steering
  • the EPS apparatus shown in the figure is called a column assist type because it is provided with a rotary electric machine 100 for generating an assist torque in the vicinity of the steering column.
  • the column assist type EPS device includes an steering wheel ST, a torque sensor TS for detecting a rotational driving force of the steering wheel ST, an ECU for controlling an assist torque based on an output of the torque sensor TS, and an ECU for controlling an assist torque.
  • the rotational electric power of the rotating electric machine 100 is decelerated by the gear, and the desired torque is obtained, based on the electric signal of the electric motor 100 outputting the assist torque, the vehicle battery BA serving as the energy supply source of the ECU and the electric machine 100.
  • Gear mechanism GE for outputting the torque, pinion gear PN for transmitting the torque generated by the gear mechanism GE, one or more rods RO for connecting the pinion gear PN and the gear mechanism GE, or
  • the rotational drive force generated in the multiple joints JT and the pinion gear PN is horizontal
  • the rack gear RCG which changes to the power of the rack
  • the rack case RC which covers the rack gear
  • the first dust boot DB1 and the second dust boot DB2 which are provided for preventing dust etc. from entering the rack case, the steering actually proceeds.
  • a second tie rod TR2 is provided to transmit the force to the second tire WH2.
  • the torque sensor TS detects the rotational driving force. Based on the detection signal of the torque sensor TS, the ECU calculates an energization pattern for generating a desired assist torque, and issues a command to the rotary electric machine 100.
  • the rotary electric machine 100 conducts electricity based on the command of the ECU to generate an assist torque.
  • the gear mechanism GE connected to the rotating electrical machine 100 decelerates, and the rotational driving force is transmitted to the pinion gear PN via the rod RO and the joint JT.
  • the pinion gear PN meshes with the rack gear RCG, whereby the rotational driving force of the pinion gear PN is converted into thrust in the direction perpendicular to the traveling direction of the vehicle.
  • the horizontal thrust thus generated steers the tires WH1 and WH2 via the tie rods TR1 and TR2.
  • a pinion assist type EPS device provided with a rotary electric machine 100 for generating an assist torque near the pinion gear PN, and a rotary electric machine 100 for generating an assist torque to a rack gear RCG.
  • a rack assist type EPS device provided.
  • the locking of the rotary electric machine 100 by the broken magnet is not permitted because it directly leads to a serious accident.
  • vibrational energy of the rotary electric machine 100 is propagated into the vehicle compartment via mechanical parts such as the gear mechanism GE, the rod RO, and the pinion gear PN, and is emitted as a sound wave from a panel or an inner wall near the driver's seat. The driver feels this as noise (so-called zipper noise or fastener noise).
  • This noise generation mechanism is common to a column assist type EPS device in which the rotary electric machine 100 is disposed in the vehicle compartment, and a pinion assist type or rack assist type EPS device in which the rotary electric machine 100 is arranged in the engine room.
  • an EPS apparatus capable of preventing the lock of the rotary electric machine 100 with high reliability, improving the assist performance at the time of steering wheel operation, and quieting the vehicle interior can be provided. There is an effect that can be done.
  • the rotating electrical machine having 10 poles and 60 slots is described in the drawings, but the present technology can be applied to a rotating electrical machine having any number of poles and slots.
  • the stator winding may be concentrated winding or distributed winding.
  • the rotating electric machine of the inner rotor having the rotor rotatably disposed in the stator has been described, but the rotating electric machine of the outer rotor having the rotor rotatably disposed outside the stator
  • the permanent magnet is in contact with the bridge connecting one pole of the pair of opposing side surfaces to the bridge connecting the magnetic poles, and the other side is in contact with the projection provided in the magnet housing hole, and the projection

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

Abstract

L'objet de la présente invention est de permettre de supprimer la détérioration de caractéristiques de machines dynamo-électriques en raison de la déformation d'une partie de pont et un accroissement du coût en raison d'un accroissement du nombre de composants, et de positionner et de fixer un aimant permanent au moyen d'une configuration simple. Afin de résoudre le problème ci-dessus, la machine dynamo-électrique selon la présente invention comporte un stator et un rotor disposé à un intervalle prédéfini par rapport au stator, le rotor comprenant un noyau de rotor comportant un trou de logement d'aimants en forme de V, et une pluralité d'aimants permanents logés dans le trou de logement d'aimants en forme de V du noyau de rotor pour former un seul pôle magnétique, la machine dynamo-électrique étant caractérisée : en ce que les aimants permanents sont tels que parmi une paire de surfaces latérales mutuellement opposées, une des surfaces latérales est en contact avec une partie de pont reliant des pôles magnétiques du côté de la périphérie extérieure, et en ce que l'autre surface latérale est en contact avec une excroissance qui est disposée dans le trou de logement d'aimants en forme de V et qui forme un seul bloc avec le noyau de rotor ; et en ce que les excroissances exercent une force d'inclinaison destinée à presser les aimants permanents vers le côté de la partie de pont.
PCT/JP2018/041426 2017-11-29 2018-11-08 Machine électrique rotative, procédé de fabrication de son rotor, et dispositif auxiliaire électrique automoteur WO2019107104A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2017228825A JP2019103173A (ja) 2017-11-29 2017-11-29 回転電機及びそのロータ製作方法並びに自動車用電動補機装置
JP2017-228825 2017-11-29

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113472105A (zh) * 2020-03-30 2021-10-01 日本电产株式会社 Ipm马达用转子
DE102022131793A1 (de) 2022-11-30 2024-06-06 Valeo Eautomotive Germany Gmbh Rotor für eine elektrische Maschine mit einer mechanischen Befestigung von Rotormagneten

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102021126649A1 (de) 2021-10-14 2023-04-20 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Rotoranordnung und Elektromaschine

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012016129A (ja) * 2010-06-30 2012-01-19 Asmo Co Ltd ロータ、及びモータ
JP2013126330A (ja) * 2011-12-15 2013-06-24 Toyota Boshoku Corp 回転電機のコア及びその組み付け方法
JP2015192592A (ja) * 2014-03-31 2015-11-02 日立オートモティブシステムズエンジニアリング株式会社 ブラシレスモータおよびこれを用いた電動パワーステアリング装置
JP2015216786A (ja) * 2014-05-12 2015-12-03 富士電機株式会社 永久磁石埋め込み式回転電機

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012016129A (ja) * 2010-06-30 2012-01-19 Asmo Co Ltd ロータ、及びモータ
JP2013126330A (ja) * 2011-12-15 2013-06-24 Toyota Boshoku Corp 回転電機のコア及びその組み付け方法
JP2015192592A (ja) * 2014-03-31 2015-11-02 日立オートモティブシステムズエンジニアリング株式会社 ブラシレスモータおよびこれを用いた電動パワーステアリング装置
JP2015216786A (ja) * 2014-05-12 2015-12-03 富士電機株式会社 永久磁石埋め込み式回転電機

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113472105A (zh) * 2020-03-30 2021-10-01 日本电产株式会社 Ipm马达用转子
EP3890162A1 (fr) * 2020-03-30 2021-10-06 Nidec Corporation Rotor de moteur ipm
DE102022131793A1 (de) 2022-11-30 2024-06-06 Valeo Eautomotive Germany Gmbh Rotor für eine elektrische Maschine mit einer mechanischen Befestigung von Rotormagneten

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