WO2019097603A1 - 永久磁石式回転電機 - Google Patents

永久磁石式回転電機 Download PDF

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Publication number
WO2019097603A1
WO2019097603A1 PCT/JP2017/041095 JP2017041095W WO2019097603A1 WO 2019097603 A1 WO2019097603 A1 WO 2019097603A1 JP 2017041095 W JP2017041095 W JP 2017041095W WO 2019097603 A1 WO2019097603 A1 WO 2019097603A1
Authority
WO
WIPO (PCT)
Prior art keywords
permanent magnet
rotor core
stator
electric machine
magnet type
Prior art date
Application number
PCT/JP2017/041095
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
磯田　仁志
純士 北尾
義浩 深山
拓真 笹井
Original Assignee
三菱電機株式会社
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 三菱電機株式会社 filed Critical 三菱電機株式会社
Priority to CN201780096572.6A priority Critical patent/CN111316537B/zh
Priority to JP2019554091A priority patent/JP6929379B2/ja
Priority to PCT/JP2017/041095 priority patent/WO2019097603A1/ja
Priority to DE112017008150.5T priority patent/DE112017008150T5/de
Publication of WO2019097603A1 publication Critical patent/WO2019097603A1/ja

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
    • H02K21/12—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets
    • H02K21/14—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets rotating within the armatures
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22—Rotating parts of the magnetic circuit
    • H02K1/27—Rotor cores with permanent magnets
    • H02K1/2706—Inner rotors
    • H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
    • H02K1/274—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
    • H02K1/2753—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets the rotor consisting of magnets or groups of magnets arranged with alternating polarity
    • H02K1/276—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM]
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K29/00—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices
    • H02K29/03—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices with a magnetic circuit specially adapted for avoiding torque ripples or self-starting problems
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K2213/00—Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
    • H02K2213/03—Machines characterised by numerical values, ranges, mathematical expressions or similar information

Definitions

  • the present invention relates to a permanent magnet type rotating electrical machine, and more particularly to a rotor structure.
  • a permanent magnet type rotating electric machine which does not require external field energy for size reduction and high output is widely used.
  • the stator winding structure of this type of rotating electrical machine is roughly classified into two types: concentrated winding in which a coil is wound on one tooth and distributed winding in which a coil is wound across a plurality of teeth. Ru.
  • the concentrated winding has a shorter coil end length than the distributed winding, so the motor axial length can be shortened.
  • the magnetomotive force generated in the concentrated winding stator includes low-order harmonic components that do not contribute to torque, and due to these effects, an increase in torque ripple and an electromagnetic excitation having a low-order deformation mode Cause the occurrence of force and so on.
  • the frame resonates to generate noise when the electromagnetic excitation force is at a specific rotation number that matches the resonance frequency of a component of the rotating electrical machine, for example, the frame.
  • Patent Documents 1 and 2 have a structure that reduces torque ripple. However, this structure can not necessarily reduce the radial electromagnetic force generated on the teeth causing vibration and noise.
  • the present invention has been made to solve the above-described problems, and it is an object of the present invention to obtain a permanent magnet type rotary electric machine capable of reducing the radial electromagnetic force generated on teeth causing vibration and noise. .
  • a stator iron core is formed between the teeth in which teeth are radially projected from an annular core back and circumferentially arranged and slots are adjacent to each other in the circumferential direction; And a stator having a stator winding mounted on the stator core, and coaxially and rotatably disposed on the inner peripheral side of the stator via the magnetic gap with the stator.
  • the rotor core is formed so as to penetrate in the axial direction, and the magnet insertion hole into which the permanent magnet is inserted, and both circumferentially protruding from the magnet insertion hole, and penetrates the rotor core in the axial direction
  • a flux barrier formed as described above, and a notch formed on one end of the axial direction to the other end on the q axis of the outer peripheral surface of the rotor core, and the minimum iron in the q axis
  • the circumferential width D of the notch portion is larger than the minimum iron width C in the q axis.
  • the rotor core using a rotor core with a smaller amount of protrusion of the flux barrier from the magnet insertion hole and satisfying the relationship of A ⁇ C is subjected to centrifugal force. It is a figure which shows the result of having analyzed the stress which generate
  • FIG. 6 is a diagram showing the results of analysis of magnetic flux lines generated at the time of current application in the rotating electrical machine on which the rotor used in the analysis of FIG. 3 is mounted.
  • FIG. 5 is a diagram showing a result of analysis of magnetic flux lines generated at the time of current application in the rotating electrical machine on which the rotor used in the analysis of FIG. 4 is mounted.
  • FIG. 7 is a diagram showing a result of analysis of magnetic flux lines generated at the time of current application in the rotating electrical machine on which the rotor used in the analysis of FIG.
  • FIG. 1 is a cross-sectional view showing a permanent magnet type rotary electric machine according to Embodiment 1 of the present invention
  • FIG. 2 is a view around a permanent magnet of a rotor in the permanent magnet type rotary electric machine according to Embodiment 1 of the present invention. It is a principal part cross-sectional view shown.
  • a cross-sectional view is a cross-sectional view which shows the cross section orthogonal to the axial center of a rotor. 1 and 2 are illustrated with hatching omitted for convenience.
  • the permanent magnet type rotating electric machine 1 is composed of a stator 10 and a rotor 20.
  • the stator 10 is composed of a stator core 11 and a stator winding 15 mounted on the stator core 11.
  • the stator core 11 is composed of an annular core back 12 and 36 teeth 13 formed on the core back 12.
  • the 36 teeth 13 respectively protrude radially inward from the inner circumferential surface of the core back 12 and are arranged at equal angular pitches in the circumferential direction.
  • the space formed between the adjacent teeth 13 is a slot 14.
  • the stator winding 15 is composed of 36 concentrated winding coils 16 wound around each of the teeth 13.
  • the stator winding 15 connects the concentrated winding coil 16 and is configured, for example, as a three-phase winding.
  • the rotor 20 is composed of a rotor core 21 fixed to a rotating shaft 22 inserted at an axial center position, and a permanent magnet 23 mounted on the rotor core 21.
  • 24 magnet insertion holes 24 axially penetrating the outer peripheral portion of the rotor core 21 are formed at equal angular pitches in the circumferential direction.
  • One permanent magnet 23 is inserted into each of the magnet insertion holes 24.
  • the permanent magnets 23 arranged in the circumferential direction are magnetized such that the polarity on the outer circumferential side alternately becomes the N pole and the S pole in the circumferential direction.
  • One permanent magnet 23 constitutes one magnetic pole.
  • the rotor core 21 is manufactured by laminating and integrating magnetic pieces punched out of a magnetic thin plate such as a magnetic steel sheet.
  • the permanent magnet type rotary electric machine 1 has a rotor 20 coaxially and rotatably disposed with the stator 10 on the inner circumferential side of the stator 10 with a magnetic air gap between the stator 10 and the stator 10, Configured
  • the permanent magnet type rotating electrical machine configured in this way is a rotating electrical machine of 24 poles and 36 slots, that is, a rotating electrical machine of 2-pole 3-slot series.
  • the magnet insertion hole 24 is formed in a hole shape having a substantially rectangular cross section, and is disposed on the outer peripheral portion of the rotor core 21 with the long side of the rectangular cross section directed circumferentially. A pair of air gaps are formed so as to project from the magnet insertion hole 24 on both sides in the circumferential direction. This void portion becomes the flux barrier 25.
  • the flux barrier 25 communicates with the magnet insertion hole 24 except for the portion on the inner diameter side of the short side of the rectangular cross section of the magnet insertion hole 24.
  • the inner wall surface on the outer diameter side of the flux barrier 25 extends in the circumferential direction from the inner wall surface on the outer diameter side of the magnet insertion hole 24 and is formed in a gentle curved surface gradually displaced to the inner diameter side as it is separated from the magnet insertion hole 24 There is.
  • the flux barrier 25 may be filled with varnish or the like in a state where the permanent magnet 23 is inserted into the magnet insertion hole 24.
  • the permanent magnet 23 is formed in a rectangular cross section equivalent to the magnet insertion hole 24.
  • the permanent magnet 23 is accommodated in each of the magnet insertion holes 24 with its circumferential movement restricted by a portion on the inner diameter side of the short side of the rectangular cross section of the magnet insertion hole 24.
  • the radial direction passing through the central position in the longitudinal direction of the long side of the rectangular cross section of the permanent magnet 23 is the d axis. Further, the radial direction passing through the center position between the d axes adjacent in the circumferential direction is the q axis.
  • the d axis is a magnetic flux axis of the permanent magnet 23.
  • the q-axis is an axis electrically and magnetically orthogonal to the d-axis.
  • a notch 26 for reducing torque ripple is formed on the q-axis with the groove direction as an axial direction by recessing the outer peripheral surface of the rotor core 21.
  • the notch portion 26 is configured in a single R shape, that is, a groove shape in which circular arcs of a single radius of curvature are axially connected.
  • A is the minimum iron width at the iron portion on the outer diameter side of the magnet insertion hole 24 and the flux barrier 25
  • B is the minimum iron width at the iron portion between the notch 26 and the flux barrier 25
  • C is the q axis
  • D in the iron portion between the flux barriers 25 opposed to each other across the surface is the circumferential width of the notch 26.
  • the notch portion is formed in a complicated R shape.
  • the notch portion 26 is formed in a single R shape, that is, a groove shape in which circular arcs of a single radius of curvature are axially connected. This facilitates dimensional inspection of the rotor core 21.
  • FIG. 3 shows that the centrifugal force is applied to the rotor using the rotor iron core 21A in which the cylindrical outer peripheral surface of the iron core and the outer diameter side wall surface of the flux barrier 25 are parallel while satisfying the relationship A> C.
  • FIG. 4 is a rotor in which the width of the iron portion between the cylindrical outer peripheral surface of the iron core and the outer diameter side wall surface of the flux barrier 25 becomes wider as it approaches the q axis while satisfying the relationship A> C.
  • the result of analyzing the stress generated when centrifugal force is applied to the rotor using the iron core 21B is shown.
  • the notch part 26 is not formed.
  • a and C of the rotor core 21B were the same as A and C of the rotor core 21A used in the analysis of FIG.
  • the numbers indicate the portions where the principal stress is the highest, and indicate the numerical values of the principal stress based on the maximum value of the principal stress in FIG. 3. From FIG. 4, even if the minimum iron width A of the iron portion between the outer peripheral surface of rotor core 21B and the outer diameter side wall surface of flux barrier 25 is the same, rotor core 21B is relative to rotor core 21A. It was confirmed that the principal stress could be reduced by nearly 60%.
  • FIG. 5 uses a rotor core 21C in which the amount of protrusion of the flux barrier 25 from the magnet insertion hole is reduced and the relationship A ⁇ C is satisfied. The results of analyzing the stress generated when centrifugal force is applied to the rotor are shown. In addition, the notch part 26 is not formed.
  • the numbers indicate the portions where the principal stress is the highest, and indicate the numerical values of the principal stress based on the maximum value of the principal stress in FIG. 3. From FIG. 5, even if the minimum iron width A of the iron portion between the outer peripheral surface of rotor core 21C and the outer diameter side wall surface of flux barrier 25 is the same, rotor core 21C is relative to rotor core 21A. It was confirmed that the principal stress could be reduced by nearly 50%. However, it was confirmed that the main stress of the rotor core 21C is increased with respect to the rotor core 21B. From this, it can be understood that in order to reduce the main stress acting on the flux barrier 25, the minimum iron width C between the flux barriers 25 adjacent in the circumferential direction may be made as narrow as possible within the processable range.
  • FIG. 6 shows that when a centrifugal force is applied to the rotor using the rotor core 21 in which the notches 26 are formed such that A ⁇ B in the rotor core 21B used in the analysis of FIG. 4. The results of analyzing the generated stress are shown.
  • the numbers indicate the portions where the principal stress is the highest, and indicate the numerical values of the principal stress based on the maximum value of the principal stress in FIG. 3. It was confirmed from FIG. 6 that the rotor core 21 can obtain a principal stress distribution equivalent to that of the rotor core 21B. Furthermore, it was confirmed from FIG. 6 that the rotor core 21 can reduce the principal stress with respect to the rotor core 21B.
  • FIG. 7 the results of analyzing the magnetic flux lines generated at the time of current conduction are shown in FIG.
  • part P of FIG. 7 it was found that a part of the magnetic flux emitted from the teeth 13 flows in the circumferential direction without passing through the rotor core 21A, and interlinks with the adjacent teeth 13. This is because the outer peripheral surface of the rotor core 21A and the outer diameter side wall surface of the flux barrier 25 are parallel to each other, so that iron between the outer peripheral surface of the rotor core 21A and the outer diameter side wall surface of the flux barrier 25 It is presumed that the part is magnetically saturated by the magnetic flux of the permanent magnet 23 linking the iron part.
  • the magnetic flux of the stator is hard to pass through the iron portion on the outer peripheral side of the flux barrier 25. Therefore, the magnetic flux of the stator passing through the portion P in FIG. 7 does not contribute to the torque and hardly contributes to the generation of the radial electromagnetic force in the teeth 13.
  • FIG. 8 shows the results of analysis of magnetic flux lines generated at the time of current application in the rotating electrical machine on which the rotor used in the analysis of FIG. 4 is mounted.
  • part P of FIG. 8 it was found that a part of the magnetic flux coming out of the teeth 13 interlinks with the adjacent teeth 13 through the surface on the q axis of the rotor core 21B. This is because the outer peripheral surface of the rotor core 21B and the outer diameter side wall surface of the flux barrier 25 are not parallel to each other, so that the space between the outer peripheral surface of the rotor core 21B and the outer diameter side wall of the flux barrier 25 is It is presumed that only the minimum iron width portion of the iron portion is magnetically saturated by the magnetic flux of the permanent magnet 23 linking the iron portion.
  • the magnetic flux of the stator is likely to pass through the iron portion on the outer peripheral side of the flux barrier 25. Therefore, the magnetic flux of the stator passing through the P portion in FIG. 8 does not contribute to the torque because it links only a part of the surface of the rotor core 21B. However, since the magnetic flux of the stator passing through the portion P in FIG. 8 passes the teeth 13 in the radial direction, a radial electromagnetic force is generated in the teeth 13.
  • FIG. 9 shows the result of analyzing the magnetic flux lines generated at the time of current application in the rotating electrical machine on which the rotor used in the analysis of FIG. 6 is mounted. As shown in part P of FIG. 9, it was found that a part of the magnetic flux emitted from the teeth 13 interlinks with the adjacent teeth 13 without passing through the rotor core 21. In this electric rotating machine, although the outer peripheral surface of the rotor core 21 and the outer diameter side wall surface of the flux barrier 25 are not parallel, the notch 26 is provided on the q-axis.
  • the magnetic air gap between the stator and the rotor on the q axis is expanded, and the magnetic flux of the stator is the iron portion between the outer peripheral surface of the rotor core 21 and the outer diameter side wall surface of the flux barrier 25. It is thought that it is difficult to pass through. Therefore, the magnetic flux of the stator passing through the portion P in FIG. 9 does not contribute to the torque, and the radial electromagnetic force generated in the teeth 13 can be reduced.
  • FIG. 10 is a diagram showing the result of analyzing the radial electromagnetic force generated in the teeth by changing the minimum iron width C of the rotor core.
  • the horizontal axis is D / C
  • the vertical axis is radial electromagnetic force (sixth component) generated in the teeth.
  • Each line shows radial electromagnetic force generated on the teeth when C is made constant and D is changed.
  • C is changing for every line.
  • an electromagnetic excitation force is generated in a magnetic gap between a stator and a rotor.
  • the electromagnetic excitation force generates a radial electromagnetic force in teeth of a stator. .
  • the radial electromagnetic force vibrates the stator, structural members around the stator, and the like to generate noise.
  • radial direction electromagnetic forces of various time components for example, radial direction electromagnetic force whose deformation mode of the stator is zero order and whose sixth order time component is generated.
  • the influence of the direction of the radial direction of the deformation mode is particularly large and the time component is 6 order is large.
  • C and D should be set to satisfy C ⁇ D, D / C. It is more preferable to set C and D so as to satisfy ⁇ 1.6.
  • FIG. 11 is a cross-sectional view showing a permanent magnet type rotary electric machine according to Embodiment 2 of the present invention
  • FIG. 12 is a view around a permanent magnet of a rotor in a permanent magnet type rotary electric machine according to Embodiment 2 of the present invention. It is a principal part cross-sectional view shown. 11 and 12 are illustrated with hatching omitted for the sake of convenience.
  • the permanent magnet type rotating electrical machine 1A is configured of a stator 10 and a rotor 20A. That is, the permanent magnet type rotary electric machine 1A is configured the same as the permanent magnet type rotary electric machine 1 of the first embodiment except that the rotor 20A is used instead of the rotor 20.
  • the rotor 20A is composed of a rotor core 21A fixed to the rotating shaft 22 inserted at the axial center position, and a permanent magnet 23A mounted on the rotor core 21A.
  • a magnet insertion hole 24A having a substantially rectangular cross section which penetrates the outer peripheral portion of the rotor core 21A in the axial direction, is convex toward the axis of the rotary shaft 22, and the outer periphery of the rotor core 21A
  • Twenty-four pairs of magnet insertion holes 24A arranged in a V shape extending toward the surface are formed at equal angular pitches in the circumferential direction.
  • One permanent magnet 23A having a substantially rectangular cross section is inserted into each of the magnet insertion holes 24A.
  • the pair of permanent magnets 23 inserted into the pair of magnet insertion holes 24A is magnetized so that the opposite surfaces, ie, the surfaces on the outer peripheral side, have the same polarity.
  • the 24 pairs of permanent magnets 23A arranged in the circumferential direction are arranged so that the polarities on the outer circumferential side alternately become the N pole and the S pole in the circumferential direction for each pair.
  • the rotor core 21A is manufactured by laminating and integrating magnetic pieces punched out of a magnetic thin plate such as a magnetic steel sheet.
  • a pair of air gaps are formed to project from the magnet insertion holes 24A on both sides in the circumferential direction. These void portions become flux barriers 25Aa and 25Ab.
  • the flux barriers 25Aa and 25Ab communicate with the magnet insertion hole 24A except for the portion on the inner diameter side of the short side of the rectangular cross section of the magnet insertion hole 24A.
  • the inner wall surface on the outer diameter side of the flux barrier 25Aa communicating with the outer diameter side of the magnet insertion hole 24A extends circumferentially from the inner wall surface on the outer diameter side of the magnet insertion hole 24A, and gradually changes in inner diameter as it separates from the magnet insertion hole 24A. It is formed in a gentle curved surface that is displaced to the side.
  • the flux barriers 25Aa and 25Ab may be filled with varnish or the like in a state in which the permanent magnet 23A is inserted into the magnet insertion hole 24A.
  • the permanent magnet 23A is accommodated in each of the magnet insertion holes 24A with its movement in the circumferential direction being restricted by the portion on the inner diameter side of the short side of the rectangular cross section of the magnet insertion hole 24A.
  • the pair of permanent magnets 23A inserted in the pair of magnet insertion holes 24A constitutes one magnetic pole.
  • the permanent magnet 23A constituting one magnetic pole, the magnet insertion holes 24A, and the flux barriers 25Aa, 25Ab pass through the circumferential center position between the pair of magnet insertion holes 24A, and a plane including the axial center of the rotation shaft 22 is a plane of symmetry. It is configured to be in plane symmetry.
  • the radial direction in this plane of symmetry is the d axis. Further, the radial direction passing through the center position between the d axes adjacent in the circumferential direction is the q axis.
  • a notch 26 for reducing torque ripple is disposed on the q-axis with the groove direction as an axial direction by recessing the outer peripheral surface of the rotor core 21A.
  • the notch 26 is configured in a single R shape.
  • A is the minimum iron width in the iron portion on the outer diameter side of the magnet insertion hole 24A and the flux barrier 25Aa
  • B is the minimum iron width in the iron portion between the notch 26 and the flux barrier 25Aa
  • C is , The minimum iron width in the iron portion between the flux barriers 25Aa facing each other across the q-axis
  • D is the circumferential width of the notch 26.
  • the rotor core 21A is manufactured so as to satisfy the relationship of A ⁇ B, C ⁇ D, and A ⁇ C. Further, C is twice as large as the thickness of the magnetic thin plate constituting the rotor core 21A. Therefore, also in the second embodiment, the same effect as that of the first embodiment can be obtained.
  • the concentrated winding permanent magnet type rotating electrical machine of 24 poles and 36 slots is used, but in the case of a concentrated pole permanent magnet type rotating electrical machine of 2-pole 3-slot series, the number of poles is equal to the number of slots. It is not limited to.

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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/JP2017/041095 2017-11-15 2017-11-15 永久磁石式回転電機 WO2019097603A1 (ja)

Priority Applications (4)

Application Number Priority Date Filing Date Title
CN201780096572.6A CN111316537B (zh) 2017-11-15 2017-11-15 永磁体式旋转电机
JP2019554091A JP6929379B2 (ja) 2017-11-15 2017-11-15 永久磁石式回転電機
PCT/JP2017/041095 WO2019097603A1 (ja) 2017-11-15 2017-11-15 永久磁石式回転電機
DE112017008150.5T DE112017008150T5 (de) 2017-11-15 2017-11-15 Rotierende elektrische Permamentmagnetmaschine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2017/041095 WO2019097603A1 (ja) 2017-11-15 2017-11-15 永久磁石式回転電機

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WO2019097603A1 true WO2019097603A1 (ja) 2019-05-23

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PCT/JP2017/041095 WO2019097603A1 (ja) 2017-11-15 2017-11-15 永久磁石式回転電機

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CN (1) CN111316537B (de)
DE (1) DE112017008150T5 (de)
WO (1) WO2019097603A1 (de)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009118687A (ja) * 2007-11-08 2009-05-28 Nissan Motor Co Ltd 永久磁石式回転機
JP2011097754A (ja) * 2009-10-30 2011-05-12 Mitsubishi Electric Corp 永久磁石埋込型電動機及び送風機
WO2017077789A1 (ja) * 2015-11-06 2017-05-11 アイシン精機株式会社 回転電機

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5450472B2 (ja) 2011-02-03 2014-03-26 株式会社日立産機システム 永久磁石式ジェネレータとそれを用いたハイブリッド車両
US9705366B2 (en) * 2014-04-08 2017-07-11 Mitsubishi Electric Corporation Embedded permanent magnet rotary electric machine
JP6507956B2 (ja) 2015-09-09 2019-05-08 日産自動車株式会社 永久磁石式回転電機

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009118687A (ja) * 2007-11-08 2009-05-28 Nissan Motor Co Ltd 永久磁石式回転機
JP2011097754A (ja) * 2009-10-30 2011-05-12 Mitsubishi Electric Corp 永久磁石埋込型電動機及び送風機
WO2017077789A1 (ja) * 2015-11-06 2017-05-11 アイシン精機株式会社 回転電機

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JPWO2019097603A1 (ja) 2020-04-02
JP6929379B2 (ja) 2021-09-01
DE112017008150T5 (de) 2020-07-16
CN111316537A (zh) 2020-06-19
CN111316537B (zh) 2022-05-03

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