WO2017104436A1 - Moteur de synchronisation à aimant permanent - Google Patents

Moteur de synchronisation à aimant permanent Download PDF

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Publication number
WO2017104436A1
WO2017104436A1 PCT/JP2016/085836 JP2016085836W WO2017104436A1 WO 2017104436 A1 WO2017104436 A1 WO 2017104436A1 JP 2016085836 W JP2016085836 W JP 2016085836W WO 2017104436 A1 WO2017104436 A1 WO 2017104436A1
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WO
WIPO (PCT)
Prior art keywords
rotor
permanent magnet
synchronous motor
magnet synchronous
magnets
Prior art date
Application number
PCT/JP2016/085836
Other languages
English (en)
Japanese (ja)
Inventor
裕司 辻
金澤　宏至
Original Assignee
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
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エンジニアリング株式会社 filed Critical 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
Publication of WO2017104436A1 publication Critical patent/WO2017104436A1/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 permanent magnet synchronous motor, and more particularly to a permanent magnet synchronous motor used in an electric auxiliary system for an automobile such as an electric power steering device.
  • EPS electric power steering
  • the driver feels the torque pulsation of the motor through the steering wheel. Therefore, in the EPS motor, it is necessary to reduce the torque pulsation to about 1 to several percent or less of the assist torque and the cogging torque to about 0.1% of the assist torque. Furthermore, in recent years, engine noise reduction has progressed against the background of the spread of vehicles equipped with an idling stop function. As a result, low vibration and low noise are strongly demanded for electrical components such as EPS devices from the viewpoint of reducing vehicle interior noise.
  • the positioning of the rotor permanent magnet is improved by placing the permanent magnet close to the protrusion provided on the rotor core, and the rotor-side positioning accuracy is improved.
  • a method of reducing a cogging torque component caused by variation is known.
  • the present invention has been made to solve the above-described problems of the prior art, suppresses the deterioration of cogging torque and torque pulsation, eliminates the difference between forward and reverse rotation of torque pulsation, and improves steering feeling.
  • the purpose is to improve.
  • the permanent magnet synchronous motor includes a first rotor having a plurality of first magnets, and a second rotor having a plurality of second magnets arranged in the direction of the rotation axis with respect to the first rotor.
  • the first rotor has a plurality of first fixing portions that fix the plurality of first magnets, and the second rotor fixes each of the plurality of second magnets.
  • Each of the plurality of first magnets is disposed close to one side of each of the plurality of first fixing portions in the circumferential direction, and each of the plurality of second magnets.
  • the forward / reverse difference in torque pulsation of the permanent magnet synchronous motor can be eliminated, and the steering feeling can be improved.
  • FIG. 2 is a view showing a radial cross section of the first rotor 1 when cut along the AA cross section in FIG. 1 and a radial cross section of the second stator 3 when cut along the BB cross section. It is the figure which showed the radial direction cross section of the 1st rotor 1, and the radial direction cross section of the 2nd stator 3 of the permanent magnet synchronous motor in 2nd Embodiment side by side. It is the figure which put in order and showed the radial direction cross section of the 1st rotor 1, and the radial direction cross section of the 2nd stator 3 of the permanent-magnet synchronous motor in 3rd Embodiment.
  • FIG. 1 is an axial sectional view of a permanent magnet synchronous motor according to the present embodiment.
  • the permanent magnet synchronous motor of this embodiment includes a single stator 2, a first rotor 1 and a second rotor 3 that are rotatably arranged in the stator 2 and divided in the axial direction, and a first A drive shaft 5 that supports the rotor 1 and the second rotor 3 and a frame 6 that holds the stator 2 are provided.
  • Stator 2 has a stator core and a stator winding wound around a tooth portion of the stator core. In FIG. 1, a coil end portion 7 of the stator winding is shown.
  • FIG. 2 is a diagram showing the radial cross section of the first rotor 1 when cut along the AA cross section in FIG. 1 and the radial cross section of the second stator 3 when cut along the BB cross section. is there.
  • the first rotor 1 has a plurality of first permanent magnets 9 attached to the outer periphery of the first rotor core 50.
  • the second rotor 3 has a plurality of second permanent magnets 14 attached to the outer periphery of the second rotor core 51.
  • FIG. 7 shows a radial cross-sectional view of a conventional rotor as a comparative example.
  • the first permanent magnet 9 of the first rotor 1 and the second permanent magnet 14 of the second rotor 3 are arranged close to the fixed portion 51 and the fixed portion 52 on the same direction side. is doing.
  • FIG. 8 shows a calculation result of a torque waveform of a conventional technique as a comparative example, and the torque has a fluctuation (torque pulsation) when energized.
  • the solid line waveform indicates that the first permanent magnet 9 and the second permanent magnet 14 shown in FIG. 7 are not brought close to the fixed portion 51 or the fixed portion 52, and are intermediate between the plurality of fixed portions 51 or between the plurality of fixed portions 52. The result when arranged is shown.
  • the large dotted line waveform indicates that the first permanent magnet 9 and the second permanent magnet 14 are brought close to the fixed portion 51 and the fixed portion 52 along the rotation direction 12 (forward rotation direction) of the motor.
  • the fine dotted waveform shows the result when the motor rotates in the reverse direction (opposite to the rotational direction 12) when approaching the fixed part of the magnet in the same manner as when the large dotted waveform is calculated.
  • FIG. 9 shows the value of torque pulsation obtained from the torque waveform of FIG. Conventionally, when the rotor is divided in the axial direction, the permanent magnets are moved in the same direction as shown in FIG. 7, so that the torque waveform and torque during normal rotation and reverse rotation as shown in FIGS. There was a difference in pulsation.
  • the first rotor 1 includes a rotor core 50, a plurality of first permanent magnets 9, and a plurality of first permanent magnets that respectively fix the first permanent magnets.
  • the fixing part 10 is formed.
  • Each of the plurality of first magnets 10 is disposed close to the one surface 10a side of each of the plurality of first fixing portions 10 in the circumferential direction.
  • the second rotor 3 forms a rotor core 51, a plurality of second permanent magnets 14, and a plurality of second fixing portions 15 that fix the second permanent magnets 14, respectively.
  • Each of the plurality of second magnets 14 is a surface of each of the plurality of second fixing portions 15 in the circumferential direction, and is disposed close to the other surface 15b side opposite to the one surface 15a side.
  • the direction in which the first permanent magnet 9 approaches and the direction 11 in which the second permanent magnet 14 approaches are opposite to the rotation direction 12 of the motor, so that the first rotor 1 and the second rotor 3 If both are considered as one rotor, in the rotor, there is no difference between the left and right in the rotor geometry, so that substantially the same torque pulsation occurs during forward and reverse rotation of the motor.
  • the first rotor 1 and the second rotor 3 are arranged in the axial direction with a space therebetween, but the first rotor 1 and the second rotor 3 may be connected, In order to reduce cogging torque and torque pulsation, the second rotor 3 may be arranged with a shift in the circumferential direction with respect to the first rotor 1.
  • FIG. 3 is a diagram showing the radial cross section of the first rotor 1 and the radial cross section of the second stator 3 of the permanent magnet synchronous motor in the second embodiment.
  • the motor of this embodiment is a synchronous motor with a built-in embedded magnet.
  • the 1st permanent magnet 9 is arrange
  • the second permanent magnet 14 is arranged close to the inner surface side opposite to the side where the first permanent magnet 9 is brought closer to the rotation direction 12 of the motor in the insertion hole 21 provided in the rotor. .
  • the first rotor 1 and the second rotor 3 bring the permanent magnets in the opposite directions 11 so that the change in the cogging torque / torque pulsation of the first rotor 1 and the second rotor. Since the cogging torque / torque pulsation changes of 3 cancel each other, the cogging torque / torque pulsation itself does not deteriorate.
  • FIG. 4 is a diagram showing the radial cross section of the first rotor 1 and the radial cross section of the second stator 3 of the permanent magnet synchronous motor according to the third embodiment.
  • the motor of the present embodiment is a continuous pole type surface magnet type synchronous motor and has a pseudo magnetic pole 22 formed between the first permanent magnets 9.
  • the plurality of first permanent magnets 9 of the first rotor 1 are arranged close to the one surface 10 a side of the first fixed portion 10.
  • the plurality of second permanent magnets 14 of the second rotor 3 are arranged close to the other side 15b of the second fixed portion 15 opposite to the one surface 15a side.
  • the first fixing part 10 and the second fixing part 15 may be made of the same material as the pseudo magnetic pole, or may be different.
  • FIG. 5 is a view showing the radial cross section of the first rotor 1 and the radial cross section of the second stator 3 side by side in the permanent magnet synchronous motor in the fourth embodiment.
  • the motor of this embodiment is a continuous pole type embedded magnet type synchronous motor.
  • the 1st permanent magnet 9 is the insertion hole 20 provided in the rotor, and is arrange
  • the 2nd permanent magnet 14 is the insertion hole 21 provided in the rotor, and is arrange
  • FIG. 6 is an axial cross-sectional view of a permanent magnet synchronous motor in the fifth embodiment.
  • the motor of this embodiment is obtained by applying the rotor structure in the first embodiment to a motor having a plurality of stators in the axial direction.
  • the motor of the present embodiment is rotatable in the first motor unit having the first rotor 1 disposed rotatably in the first stator 25 and in the second stator 26.
  • the second motor unit having the second rotor 3 arranged in the first, the drive shaft 5 provided in common for the first rotor 1 and the second rotor 3, the first stator 25 and the second fixed And a frame 6 that holds the child 26.
  • the first stator 25 and the second stator 26 may be arranged with an angle shifted in the circumferential direction. Moreover, you may arrange
  • the first fixing portion 10 and the second fixing portion 15 may be formed of a material different from that of the rotor core.
  • the leakage magnetic flux to the first fixed portion 10 and the second fixed portion 15 is reduced, and the cogging torque and torque pulsation suppression effect is reduced. Can be expected.
  • stator winding may be concentrated winding or distributed winding.
  • the number of rotors with magnets on the forward rotation side or reverse rotation side will be one more, but with the rotors with magnets on the normal rotation side fixed part, The effect of reducing the torque pulsation forward / reverse difference proportional to the number of rotor pairs with magnets brought to the side fixing portion can be obtained.
  • the motor of the inner rotor having the rotor arranged rotatably in the stator has been described.
  • the outer rotor having the rotor arranged rotatably outside the stator The same effect as above can be obtained by reversing the direction in which the magnet of the first rotor is approached and the direction in which the magnet of the second rotor is approached.
  • the radial gap type motor in which the stator and the rotor are coaxially opposed to each other has been described.
  • the stator and the rotor are disposed to face each other in the axial direction.
  • the same effect as described above can be obtained by reversing the direction in which the magnet of the first rotor is approached and the direction in which the magnet of the second rotor is approached.
  • the above motor may be driven by a single inverter or may be driven by a plurality of inverters. When driven by a plurality of inverters, even when one inverter fails, the remaining inverters can drive the motor, which is effective from the viewpoint of fail-safe in an emergency.

Landscapes

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

Abstract

L'objet de la présente invention est de réduire la différence de pulsation de couple pendant des rotations normales/inverses d'un moteur de synchronisation à aimant permanent et d'améliorer la sensation de direction. Le moteur de synchronisation à aimant permanent selon la présente invention est pourvu d'un premier rotor présentant une pluralité de premiers aimants et d'un second rotor présentant une pluralité de seconds aimants, le second rotor étant positionné dans la direction de l'axe rotatif par rapport au premier rotor. Le premier rotor présente une pluralité de premières parties de fixation pour fixer chaque aimant de la pluralité de premiers aimants. Le second rotor présente une pluralité de secondes parties de fixation pour fixer chaque aimant de la pluralité de seconds aimants. Chaque aimant de la pluralité de premiers aimants est agencé plus proche d'un côté de surface de chaque partie de la pluralité de premières parties de fixation dans la direction circonférentielle. Chaque aimant de la pluralité de seconds aimants est agencé plus proche de l'autre côté de surface, sur le côté opposé au côté de surface susmentionné, de chaque partie de la pluralité de secondes parties de fixation dans la direction circonférentielle.
PCT/JP2016/085836 2015-12-18 2016-12-02 Moteur de synchronisation à aimant permanent WO2017104436A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2015-246854 2015-12-18
JP2015246854A JP2017112778A (ja) 2015-12-18 2015-12-18 永久磁石同期モータ

Publications (1)

Publication Number Publication Date
WO2017104436A1 true WO2017104436A1 (fr) 2017-06-22

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WO (1) WO2017104436A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019138767A1 (fr) * 2018-01-15 2019-07-18 株式会社デンソー Moteur sans balais
WO2022091198A1 (fr) 2020-10-27 2022-05-05 三菱電機株式会社 Machine électrique tournante et dispositif de direction assistée électrique

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4387058A1 (fr) * 2022-12-13 2024-06-19 GE Energy Power Conversion Technology Ltd Machine électrique tournante, ensemble de telles machines, bateau et laminoir associés

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09182387A (ja) * 1995-12-27 1997-07-11 Aisin Aw Co Ltd モータ
JP2006060952A (ja) * 2004-08-23 2006-03-02 Matsushita Electric Ind Co Ltd 永久磁石埋込み型電動機
JP2009118739A (ja) * 2002-10-18 2009-05-28 Mitsubishi Electric Corp 永久磁石式回転電機の製造方法および永久磁石式回転電機
JP2010226784A (ja) * 2009-03-19 2010-10-07 Minebea Co Ltd モーター用磁石組立体及びこれを用いたローター並びにモーター
JP2011083188A (ja) * 2010-11-24 2011-04-21 Hitachi Automotive Systems Ltd 回転電機および電気自動車
JP2013066370A (ja) * 2011-06-21 2013-04-11 Asmo Co Ltd モータ及びロータの製造方法

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09182387A (ja) * 1995-12-27 1997-07-11 Aisin Aw Co Ltd モータ
JP2009118739A (ja) * 2002-10-18 2009-05-28 Mitsubishi Electric Corp 永久磁石式回転電機の製造方法および永久磁石式回転電機
JP2006060952A (ja) * 2004-08-23 2006-03-02 Matsushita Electric Ind Co Ltd 永久磁石埋込み型電動機
JP2010226784A (ja) * 2009-03-19 2010-10-07 Minebea Co Ltd モーター用磁石組立体及びこれを用いたローター並びにモーター
JP2011083188A (ja) * 2010-11-24 2011-04-21 Hitachi Automotive Systems Ltd 回転電機および電気自動車
JP2013066370A (ja) * 2011-06-21 2013-04-11 Asmo Co Ltd モータ及びロータの製造方法

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019138767A1 (fr) * 2018-01-15 2019-07-18 株式会社デンソー Moteur sans balais
WO2022091198A1 (fr) 2020-10-27 2022-05-05 三菱電機株式会社 Machine électrique tournante et dispositif de direction assistée électrique

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