WO2023136117A1 - Machine électrique rotative - Google Patents

Machine électrique rotative Download PDF

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Publication number
WO2023136117A1
WO2023136117A1 PCT/JP2022/047952 JP2022047952W WO2023136117A1 WO 2023136117 A1 WO2023136117 A1 WO 2023136117A1 JP 2022047952 W JP2022047952 W JP 2022047952W WO 2023136117 A1 WO2023136117 A1 WO 2023136117A1
Authority
WO
WIPO (PCT)
Prior art keywords
axial direction
rotor
centrifugal fan
electric machine
machine according
Prior art date
Application number
PCT/JP2022/047952
Other languages
English (en)
Japanese (ja)
Inventor
健二 福井
隆之 鬼橋
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
Publication of WO2023136117A1 publication Critical patent/WO2023136117A1/fr

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K9/00—Arrangements for cooling or ventilating
    • H02K9/02—Arrangements for cooling or ventilating by ambient air flowing through the machine
    • H02K9/04—Arrangements for cooling or ventilating by ambient air flowing through the machine having means for generating a flow of cooling medium
    • H02K9/06—Arrangements for cooling or ventilating by ambient air flowing through the machine having means for generating a flow of cooling medium with fans or impellers driven by the machine shaft

Definitions

  • the present application discloses a technique for solving the above problems, and aims to provide a highly efficient rotating electric machine with high cooling capacity.
  • a rotating electrical machine with high cooling capacity and high efficiency can be provided.
  • FIG. 1 is a cross-sectional view showing the configuration of a rotating electrical machine 100 according to Embodiment 1.
  • FIG. 2 is a plan view of the rotor 10 viewed from the axial direction Z.
  • FIG. The rotary electric machine 100 includes a stator 20 , a rotor 10 rotatably supported with its outer peripheral surface opposed to the inner peripheral surface of the stator 20 with a gap 4 interposed therebetween, and a housing 3 .
  • the rotor 10 is composed of a shaft 11 , a rotor core 12 , magnets 13 , end plates 14 and a centrifugal fan 15 .
  • a rotor core 12 in which electromagnetic steel plates are laminated in the axial direction Z is fixed to the shaft 11 .
  • a plate 14 is provided.
  • the rotary electric machine 100 is an IPM rotary electric machine (IPM: Interior Permanent Magnet).
  • FIG. 3 is a perspective view showing the configuration of the centrifugal fan 15.
  • FIG. 3 is a perspective view showing the configuration of the centrifugal fan 15.
  • the number of blades 15W is six in FIG. 3, the number of blades 15W does not have to be six, and the number of blades 15W may be changed according to the required cooling capacity and rotational speed.
  • FIG. 4 is a perspective view showing the configuration of the centrifugal fan 15 with a shroud.
  • the shroud 15A is attached inside the centrifugal fan 15 in the axial direction Z.
  • the shroud 15A has a hollow disk shape facing the coil 22 in the axial direction Z.
  • the shroud 15A restricts the flow path of the coolant flowing into the centrifugal fan 15 from the axial direction Z, and restricts blowback of the coolant.
  • the outer diameter of the shroud 15A is Rfo, which is the same as the outer diameter of the centrifugal fan 15 .
  • the inner diameter of the shroud 15A is Rfsi.
  • the housing 3 has an outlet 31OUT on the side with the centrifugal fan 15 and an inlet 31OUT on the side without the centrifugal fan 15 (opposite side in the axial direction Z) in order to secure the flow path of the refrigerant from the outside.
  • 31 IN is provided.
  • the suction port 31IN is provided outside the end plate 14 in the axial direction Z so as to open in the radial direction X. It may be provided to One end of the discharge port 31OUT on the stator core side in the axial direction Z is closer to the stator core 21 than the shroud 15A in the axial direction Z. As shown in FIG.
  • the centrifugal fan 15 of the rotor 10 creates a negative pressure inside the rotating electrical machine 100, and the coolant flows through the flow path indicated by the arrow P in FIG. flowing. That is, the refrigerant flows in the axial direction Z from the inlet 31IN side toward the outlet 31OUT.
  • FIG. 5 is a cross-sectional view showing the configuration of rotating electric machine 200 according to the second embodiment.
  • the difference in configuration between rotating electrical machine 100 of the first embodiment and rotating electrical machine 200 of the second embodiment is the support configuration of rotor 210 .
  • Rotating electric machine 200 is composed of rotor 210 , stator 20 and housing 3 .
  • a bearing 16 is provided on the outer side of the one end plate 14 in the axial direction Z.
  • a centrifugal fan 15 is provided between the end plate 14 and the bearing 16 (outside the end plate 14 in the axial direction Z), and the centrifugal fan 15 is arranged on a plane perpendicular to the axial direction Z of the shaft 211. ing. Centrifugal fan 15 rotates coaxially with shaft 11 .
  • a non-rotating portion of the bearing 16 (the outer ring of the bearing 16 in FIG. 5) is fixed to the housing 203 .
  • the rotor core 12 may be a dust core instead of the laminated electromagnetic steel sheets.
  • a cross section perpendicular to the axial direction Z of the rotor 210 is the same as in FIG. 2 of the first embodiment.
  • the outer diameter of the rotor 10 is Rrc.
  • the rotor core 12 extends in the axial direction Z and is provided with four slots S provided at regular intervals in the circumferential direction Y, and the magnets 13 are inserted in the axial direction Z in the IPM electric rotating machine ( IPM: Interior Permanent Magnet).
  • the configurations of the centrifugal fan 15 and the stator 20 are also the same as those of the first embodiment, so they are omitted.
  • the housing 203 is composed of a housing body 32 and a bracket 33.
  • the housing body 32 is provided with a discharge port 31OUT on the side with the centrifugal fan 15 and an intake port 231IN on the side without the centrifugal fan 15 (opposite side in the axial direction Z) in order to secure a coolant flow path.
  • the discharge port 31OUT is provided so as to open in the axial direction Z, but it may be provided so as to open in the radial direction X at the end of the housing body 32 on the side where the centrifugal fan 15 is not provided.
  • the bracket 33 may be omitted.
  • the refrigerant flows into the housing 203 from the suction port 231IN of the bracket 33 provided at one end of the housing 203 in the axial direction Z, flows through the gap 4 between the rotor 210 and the stator 20, and flows through the centrifugal fan 15. It is discharged to the outside of the housing 203 from an outlet 31OUT facing the centrifugal fan 15 in the radial direction X. Rotating electric machine 200 can be cooled by the flow of this coolant.
  • the vortex of the refrigerant flowing into the centrifugal fan 15 from the inner side of the shroud 15A in the radial direction X is The shroud 15A serves as a wall and can suppress the blowback of the refrigerant to the upstream side.
  • the coolant can be efficiently flowed to the outside of the rotating electrical machine 100 without reducing the cross-sectional area of the flow path (without generating pressure loss), and the cooling efficiency of the rotating electrical machine 100 can be improved.
  • the rotating electric machine 200 can be easily assembled.
  • the rotary electric machine 300 according to the third embodiment has the same effects as the first and second embodiments. Moreover, since the bearing 16 is provided only on one side as compared with the first embodiment, the assembly of the rotary electric machine 300 is facilitated.
  • the rotor 10 with the bearings 16 fixed thereto is inserted into the stator 20 after the stator 20 is fixed to the housing body 32. Since the rotary electric machine 300 can be assembled with the rotary electric machine 300, the ease of assembly of the rotary electric machine 300 can be improved.
  • FIG. 12 is a cross-sectional view showing the configuration of rotating electric machine 400 according to the fourth embodiment.
  • FIG. 7 is a perspective view of end plate 414 .
  • the lower side of the paper surface of FIG. 7 is the rotor core 12 side.
  • Four notches 414k are provided in the lower surface of the end plate 414 at equal intervals in the circumferential direction in the axial direction Z, and these notches 414k communicate with the flux barriers 17 adjacent in the circumferential direction. , are provided so as to open in the radial direction X.
  • the rotary electric machine when the rotor rotates, negative pressure is formed by the centrifugal fan 15, and the refrigerant flows in the axial direction Z from the side where the centrifugal fan 15 is not arranged to the side where the centrifugal fan 15 is arranged.
  • the flux barrier 17 provided on the rotor 10 can also be used as a coolant flow path through the notch 414k. Thereby, the cooling performance of the rotor 10 can be further improved.
  • the coolant that has flowed through the flux barrier 17 flows toward the coil end portions 22e of the coils 22 located outside in the radial direction X of the rotor 10, and the coolant flows to the coil end portions 22e.
  • the notch 414k is positioned on the rotor 10 side (the stator core side) of the shroud 15A in the axial direction.
  • the outer diameter L1 of the end plate 514 is made larger than the length W1 between the two magnets 13 arranged symmetrically about the center O of the shaft 11 .
  • the end plate 514 covers at least part of the end surface of the magnet 13 in the axial direction Z, but does not cover the axial opening 17OUT of the flux barrier 17 .
  • the flux barrier 17 can be secured as a coolant flow path without interfering with the magnet fixing function of the end plate 514 .
  • the rotor 10 rotates, a negative pressure is generated by the centrifugal fan 15, and the refrigerant flows in the axial direction Z from the side where the centrifugal fan 15 is not arranged to the side where it is arranged.
  • the flux barrier 17 provided on the rotor 10 can also be used as a flow path. Thereby, the cooling performance of the rotor 10 can be improved.
  • the radius of the end plate 614 having the tapered portion 614T on the side of the centrifugal fan 15 may be smaller than the outer diameter of the shaft 15S of the centrifugal fan 15 . If both are the same, the outer peripheral surface of one axially outer end of the tapered portion 614T of the end plate is preferably connected to the outer peripheral surface of the root portion of the blade 15W of the centrifugal fan 15, as shown in FIG.
  • the space between the end plate 614 and the coil end portion 22e of the stator 20 is widened, and the refrigerant flowing out from the gap 4 can be smoothly introduced into the centrifugal fan 15. This can reduce the pressure loss.
  • FIG. 10 is a cross-sectional view showing the configuration of rotating electric machine 700 according to the seventh embodiment. As shown in FIG. 10, in this embodiment, shaft 715S of centrifugal fan 715 functions as an end plate.
  • a single part can perform the functions of the end plates 14 to 614 and the centrifugal fan 15 described above, and the number of parts of the rotary electric machine 700 can be reduced. can.
  • the balance of the rotor 710 is corrected after the shaft 11, the rotor core 12, the magnet 13 and the end plate 14 are assembled, and then the centrifugal fan 15 is assembled. However, if the end plate 14 and the centrifugal fan 15 are integrally molded, the shaft 11, the rotor core 12, the magnet 13, the end plate 14, and the centrifugal fan 715 are assembled. The balance adjustment process can be completed with a single balance correction.
  • the coil 822 is covered and fixed by the potting 23, so that the vibration resistance of the coil 822 can be improved. Moreover, since the potting 23 can function as a shroud for the centrifugal fan 15, the shroud for the centrifugal fan 15 can be omitted, and the moment of inertia of the rotor 10 can be reduced accordingly. In addition, manufacturing of the centrifugal fan 15 is facilitated.
  • FIG. 13 is a cross-sectional view of main parts showing the configuration of rotating electric machine 900 according to the ninth embodiment. As shown in FIG. 13, slots 20S for accommodating the coils 22 of the stator 920 are formed between the tooth portions 21T adjacent in the circumferential direction Y. As shown in FIG. 13,
  • the coil 22 is fixed by filling the potting 23 made of a resin material in the slot 20S and sealing it.
  • the tooth portion 21T of the stator 920 has shoe portions 21TS that protrude from the inner tip in the radial direction X to both sides in the circumferential direction Y.
  • a slot open portion SO is provided between two tooth portions 21T adjacent to each other in the circumferential direction Y.
  • a groove 24 extending in the axial direction Z is provided in the resin potting 23 of the slot open portion SO.
  • a groove 24 extending in the axial direction Z is formed by recessing on the outside of X. As shown in FIG.
  • the groove 24 provided in the resin material of the slot open portion SO increases the cross-sectional area of the coolant flow path between the stator 920 and the rotor 10, thereby increasing the flow rate of the coolant. Thereby, the cooling capacity of the coil 22 can be improved.
  • the present invention is not limited to the SPM rotating electric machine, and can also be applied to an IPM rotating electric machine and the like.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Motor Or Generator Cooling System (AREA)

Abstract

Une machine électrique rotative (100) comprend un rotor (10) pourvu d'un ventilateur centrifuge (15) qui tourne de manière coaxiale avec un arbre (11), un stator (20) pourvu d'un noyau de stator (21) et d'une bobine (22) enroulée autour du noyau de stator (21), et un boîtier (3) à l'intérieur duquel le stator (20) est fixé. Le boîtier (3) est pourvu d'un orifice d'admission (31IN) davantage vers l'extérieur dans la direction axiale (Z) qu'une autre plaque d'extrémité (14) qui ne comporte pas de ventilateur centrifuge (15) ; le boîtier (3) est pourvu d'un orifice d'évacuation (31OUT) opposé au ventilateur centrifuge (15) dans la direction radiale (X) ; le ventilateur centrifuge (15) est pourvu d'un carénage (15A) sur le côté intérieur dans la direction axiale (Z) ; et le diamètre intérieur du carénage (15A) est supérieur au diamètre extérieur du rotor (10).
PCT/JP2022/047952 2022-01-11 2022-12-26 Machine électrique rotative WO2023136117A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2022-002361 2022-01-11
JP2022002361 2022-01-11

Publications (1)

Publication Number Publication Date
WO2023136117A1 true WO2023136117A1 (fr) 2023-07-20

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ID=87279055

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2022/047952 WO2023136117A1 (fr) 2022-01-11 2022-12-26 Machine électrique rotative

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WO (1) WO2023136117A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015198527A (ja) * 2014-04-02 2015-11-09 三菱電機株式会社 回転電機
WO2019008820A1 (fr) * 2017-07-05 2019-01-10 三菱電機株式会社 Machine électrique tournante
WO2019186615A1 (fr) * 2018-03-26 2019-10-03 三菱電機株式会社 Stator, moteur électrique, aspirateur électrique et dispositif de séchage des mains

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015198527A (ja) * 2014-04-02 2015-11-09 三菱電機株式会社 回転電機
WO2019008820A1 (fr) * 2017-07-05 2019-01-10 三菱電機株式会社 Machine électrique tournante
WO2019186615A1 (fr) * 2018-03-26 2019-10-03 三菱電機株式会社 Stator, moteur électrique, aspirateur électrique et dispositif de séchage des mains

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