WO2020262139A1 - Machine tournante électrique - Google Patents

Machine tournante électrique Download PDF

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Publication number
WO2020262139A1
WO2020262139A1 PCT/JP2020/023739 JP2020023739W WO2020262139A1 WO 2020262139 A1 WO2020262139 A1 WO 2020262139A1 JP 2020023739 W JP2020023739 W JP 2020023739W WO 2020262139 A1 WO2020262139 A1 WO 2020262139A1
Authority
WO
WIPO (PCT)
Prior art keywords
housing
thermal resistance
stator core
circumferential direction
electric machine
Prior art date
Application number
PCT/JP2020/023739
Other languages
English (en)
Japanese (ja)
Inventor
健佑 田中
茂昌 加藤
Original Assignee
株式会社デンソー
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 株式会社デンソー filed Critical 株式会社デンソー
Publication of WO2020262139A1 publication Critical patent/WO2020262139A1/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
    • H02K1/12—Stationary parts of the magnetic circuit
    • H02K1/18—Means for mounting or fastening magnetic stationary parts on to, or to, the stator structures
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/18—Casings or enclosures characterised by the shape, form or construction thereof with ribs or fins for improving heat transfer
    • 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

Definitions

  • This disclosure relates to a rotary electric machine.
  • a functional part such as a mounting part is provided on the outer peripheral surface of the housing in addition to the heat dissipation part.
  • the thermal resistance tends to be higher in the part where the functional part such as the mounting part is located than in other parts without the functional part, that is, the thermal resistance tends to be higher in the circumferential direction of the housing. It was found to be non-uniform. Therefore, the inventor has found a problem that the cooling of the stator may differ depending on the setting of the circumferential position of the stator with respect to the housing.
  • the purpose of the present disclosure is to provide a rotary electric machine that enables efficient cooling of the stator.
  • the rotary electric machine includes a tubular housing and a stator core having an annular shape along the circumferential direction of the housing and fixed to the inner peripheral surface of the housing. ..
  • the housing has a first thermal resistance portion (25) partially provided in the circumferential direction.
  • the first thermal resistance portion has a higher thermal resistance than the portion (21a) other than the first thermal resistance portion in the circumferential direction of the housing.
  • the stator core has a second thermal resistance portion (34, 41) partially provided in the circumferential direction.
  • the second thermal resistance portion has a higher thermal resistance than the portion (32a) other than the second thermal resistance portion in the circumferential direction of the stator core.
  • the second thermal resistance portion is located inside the first thermal resistance portion in the radial direction.
  • the first thermal resistance portion which is a portion having a high thermal resistance of the housing
  • the second thermal resistance portion which is a portion having a high thermal resistance of the stator core
  • FIG. 1 is a schematic cross-sectional view of a rotary electric machine according to an embodiment.
  • FIG. 2A is a plan view of the stator in the same form, and FIG. 2B is an enlarged plan view showing a part of the stator in the same form.
  • FIG. 3A is a plan view of the stator in the modified example, and FIG. 3B is an enlarged plan view showing a part of the stator in the modified example.
  • the rotary electric machine 11 of the present embodiment includes a housing 12 having a substantially bottomed cylindrical shape and a cover 13 attached to the housing 12. Further, the rotary electric machine 11 includes a substantially cylindrical stator 14 fixed to the inner peripheral surface of the housing 12, and a rotor 15 rotatably supported inside the stator 14.
  • the rotary electric machine 11 of the present embodiment is used, for example, as a drive source for a ventilation fan or a blower for a radiator of a vehicle.
  • the rotor 15 is a permanent magnet fixed to a stator core fixed to a rotating shaft 16.
  • the rotating shaft 16 is rotatably supported by bearings 17 fixed to the bottom 22 of the housing 12 and the cover 13, respectively. Further, one side of the rotating shaft 16 in the axial direction is provided so as to project outward.
  • the output unit 18 is fixed to one side of the rotating shaft 16 in the axial direction.
  • a propeller fan as an output unit 18 is fixed to the rotary shaft 16.
  • the housing 12 includes a cylindrical peripheral wall 21 and a bottom portion 22 that closes one end of the peripheral wall 21 in the axial direction.
  • the cover 13 closes the open end 23, which is the axial end of the peripheral wall 21 opposite to the bottom 22.
  • each screw engaging portion 25 has a thickness in the radial direction that is thicker than a portion other than the screw engaging portion 25 in the circumferential direction of the peripheral wall 21. Further, each screw engaging portion 25 is formed along the axial direction from the open end portion 23 to an intermediate position in the axial direction (see FIG. 1).
  • each screw engaging portion 25 is also formed along the axial direction.
  • the screw member 24 is inserted into the screw insertion hole 13a formed through the cover 13 and is screwed into the screw hole 25a of the housing 12.
  • the cover 13 is fixed to the peripheral wall 21 of the housing 12.
  • each screw engaging portion 25 Since each screw engaging portion 25 has a screw hole 25a, it has a higher thermal resistance than a portion other than the screw engaging portion 25 in the circumferential direction of the peripheral wall 21 (hereinafter, referred to as a low thermal resistance portion 21a). .. That is, each screw engaging portion 25 corresponds to the first thermal resistance portion.
  • the low thermal resistance portion 21a of the present embodiment is a portion between the screw engaging portions 25 in the circumferential direction of the peripheral wall 21. Further, each screw engaging portion 25 of the present embodiment has a thickness in the radial direction thicker than that of the low thermal resistance portion 21a, and therefore has a higher thermal resistance than the low thermal resistance portion 21a.
  • the housing 12 is provided with a plurality of heat radiation fins 26 protruding outward in the radial direction from the outer peripheral surface of the peripheral wall 21.
  • the plurality of heat radiation fins 26 are provided at equal angular intervals in the circumferential direction. Further, the plurality of heat radiation fins 26 are provided radially.
  • the heat radiation fin 26 of this embodiment is integrally molded with the peripheral wall 21. Further, the heat radiation fins 26 are formed from one end in the axial direction to the other end in the axial direction of the peripheral wall 21.
  • each heat radiation fin 26 is configured to be located on the same circle centered on the axis of the rotating shaft 16. Further, some of the heat radiation fins 26 are formed at the same positions as the screw engaging portion 25 in the circumferential direction. That is, a part of the heat radiating fin 26 formed at the same position as the screw engaging portion 25 in the axial direction protrudes from the outer surface of the screw engaging portion 25. Therefore, in the portion of the heat radiating fin 26 protruding from the screw engaging portion 25, the protruding length in the radial direction is short (that is, the surface area is small), and the heat radiating performance is lower than that of other parts.
  • the stator 14 has a substantially annular stator core 31 fixed to the inner peripheral surface of the peripheral wall 21 of the housing 12.
  • the stator core 31 is made of a magnetic material.
  • the stator core 31 has a configuration in which a plurality of core sheets 31a (see FIG. 1) formed by press working from a metal plate are laminated in the axial direction.
  • Each core sheet 31a of the present embodiment is made of an electromagnetic steel plate.
  • the stator core 31 includes a base portion 32 forming an annular shape along the circumferential direction of the rotating shaft 16, and a plurality of teeth 33 extending radially inward from the inner peripheral surface of the base portion 32.
  • the plurality of teeth 33 are provided at equal angular intervals in the circumferential direction. Windings (not shown) are mounted on the plurality of teeth 33.
  • a welding groove 34 extending along the axial direction from one end to the other end in the axial direction of the base portion 32 is formed on the outer peripheral surface of the base portion 32.
  • four welding grooves 34 are formed at equal angular intervals in the circumferential direction.
  • Each welding groove 34 has a welded portion 34a formed by welding for fixing each core sheet 31a constituting the stator core 31 to each other.
  • the welded portion 34a is a weld mark and has a shape protruding outward in the radial direction in the welded groove 34.
  • Each welding groove 34 has a higher thermal resistance than a portion other than the welding groove 34 (hereinafter referred to as a low thermal resistance portion 32a) in the circumferential direction of the base portion 32. That is, each welding groove 34 corresponds to the second thermal resistance portion and the outer peripheral groove.
  • the plurality of core sheets 31a of the present embodiment are laminated one by one or a plurality of core sheets while rotating at an angle interval between the welding grooves 34 adjacent to each other in the circumferential direction (that is, 90 degrees in the present embodiment). ing.
  • each welding groove 34 coincides with the circumferential position of one corresponding screw engaging portion 25. That is, each weld groove 34 is located radially inside one corresponding screw engaging portion 25.
  • the center line of the welding groove 34 overlaps the center of the screw hole 25a in the circumferential direction of the stator 14. That is, the welding groove 34 is located inside the screw hole 25a in the radial direction.
  • the circumferential width of the welding groove 34 (in other words, the opening angle) is set smaller than the circumferential width of the screw hole 25a (in other words, the opening angle).
  • the entire circumferential direction of the welding groove 34 is configured to be located inside the screw hole 25a in the radial direction.
  • the portion of the stator core 31 where the weld groove 34 of the base portion 32 is formed is not in contact with the inner peripheral surface of the peripheral wall 21 of the housing 12, heat is not easily transferred from the base portion 32 to the peripheral wall 21.
  • the low heat resistance portion 32a of the base portion 32 is in contact with the inner peripheral surface of the peripheral wall 21, so that heat is easily transferred to the peripheral wall 21.
  • the screw engaging portion 25, which is a portion of the housing 12 having a high thermal resistance, and the portion of the stator core 31 having a high thermal resistance (that is, a portion having a low thermal resistance to the housing 12) are welded.
  • the positions of the grooves 34 are aligned in the circumferential direction.
  • the heat transferred to the peripheral wall 21 of the housing 12 is efficiently dissipated from each heat radiating fin 26. Then, in the present embodiment, the wind generated by the propeller fan as the output unit 18 flows in the axial direction of the rotary electric machine 11 and passes in the vicinity of each heat radiation fin 26 to dissipate heat from each heat radiation fin 26 to the outside. Is being promoted.
  • the screw engaging portion 25 of the present embodiment has a shape that protrudes outward in the radial direction from the peripheral wall 21, there is a risk of hindering a suitable flow of wind passing in the vicinity of the heat radiating fin 26, which may interfere with this. This is one of the causes of deterioration of heat dissipation in the screw engaging portion 25. Therefore, by adopting a structure in which the low thermal resistance portions 21a and 32a efficiently dissipate heat from the locations where they overlap in the radial direction, the effect of improving the heat dissipation of the rotating electric machine 11 as a whole can be obtained more remarkably.
  • the housing 12 includes a screw engaging portion 25 having a screw hole 25a into which the screw member 24 is screwed. That is, by providing the screw engaging portion 25, the stator 14 can be efficiently cooled in a configuration in which the heat dissipation performance of the housing 12 is not uniform in the circumferential direction.
  • the stator core 31 includes a weld groove 34 in which a welded portion 34a for fixing a plurality of core sheets 31a to each other is formed. That is, by providing the welding groove 34, the stator 14 can be efficiently cooled in a configuration in which the heat dissipation performance of the stator core 31 is not uniform in the circumferential direction.
  • the housing 12 includes a tubular peripheral wall 21 in which the stator core 31 is fixed to the inner peripheral surface, and a plurality of heat radiating fins 26 protruding from the outer peripheral surface of the peripheral wall 21. As a result, the heat transferred to the peripheral wall 21 of the housing 12 can be efficiently dissipated from each heat radiating fin 26.
  • This embodiment can be modified and implemented as follows.
  • the present embodiment and the following modified examples can be implemented in combination with each other within a technically consistent range.
  • the number of screw engaging portions 25 and the number of welding grooves 34 are not limited to the above embodiment, and can be appropriately changed depending on the configuration. Further, the number of screw engaging portions 25 and the number of welding grooves 34 do not have to be the same.
  • the welding groove 34 is located inside the screw hole 25a in the radial direction as in the above embodiment, but it is not necessarily inside the screw hole 25a in the radial direction but at a position inside the screw engaging portion 25 in the radial direction. It suffices if it is set.
  • the configuration of the second thermal resistance portion of the stator core 31 is not limited to the above embodiment.
  • FIGS. 3 (a) and 3 (b) An example of changing the second thermal resistance portion of the stator core 31 will be described with reference to FIGS. 3 (a) and 3 (b).
  • FIGS. 3A and 3B the same reference numerals as those in the above embodiment indicate the same configuration, and the preceding description will be referred to.
  • the stator 14 shown in FIGS. 3A and 3B is provided with a key groove 41 on the outer peripheral surface of the base portion 32.
  • Four key grooves 41 are formed at equal angular intervals in the circumferential direction.
  • Each keyway 41 extends along the axial direction from one end in the axial direction of the base 32 to the other end.
  • the stator core 31 is provided with four welding grooves 34 at equal angular intervals in the circumferential direction.
  • the welding grooves 34 and the key grooves 41 are alternately formed at equal angular intervals in the circumferential direction.
  • Each key groove 41 has a higher thermal resistance than a portion other than the weld groove 34 and the key groove 41 in the circumferential direction of the base portion 32 (that is, a portion between the weld groove 34 and the key groove 41 adjacent to each other in the circumferential direction). That is, each key groove 41 corresponds to the second thermal resistance portion and the outer peripheral groove.
  • One of the four key grooves 41 is aligned in the circumferential direction with respect to the groove 43 formed on the inner peripheral surface of the peripheral wall 21 of the housing 12. Then, by fitting the key member 42 into the hole formed by the key groove 41 and the groove 43 of the housing 12, the housing 12 and the stator core 31 are positioned in the circumferential direction to prevent them from rotating. ..
  • the core sheet 31a described in the above embodiment has a rotationally laminated structure, there is a key member 42 to which the key member 42 is not fitted.
  • each key groove 41 coincides with the circumferential position of one corresponding screw engaging portion 25. That is, each keyway 41 is located radially inside one corresponding screw engaging portion 25. More specifically, the key groove 41 is preferably located inside the screw hole 25a in the radial direction.
  • the portions of the rotary electric machine 11 having low heat dissipation are concentrated in the circumferential direction, so that the rotary electric machine 11 as a whole It is possible to improve the heat dissipation of the. As a result, the stator 14 can be efficiently cooled.
  • the number of key grooves 41 is not limited to four, and can be appropriately changed depending on the configuration.
  • the welding groove 34 is not arranged inside the screw engaging portion 25 in the radial direction, but the present invention is not limited to this, and both the welding groove 34 and the key groove 41 are the same or individual screw engaging portions. It may be arranged inside 25 in the radial direction.
  • the screw member 24 is screwed into the screw hole 25a of the screw engaging portion 25, but in addition to this, for example, a screw engaging portion having a hole through which a through bolt is inserted may be used. ..
  • the screw engaging portion 25 is configured as a portion for fixing the cover 13 to the housing 12, but in addition to this, for example, the screw engaging portion 25 is configured as a portion for fixing the rotary electric machine 11 to the mounted portion. You may.
  • the screw engaging portion 25 projects radially outward from the outer peripheral surface of the peripheral wall 21, but the present invention is not limited to this, and the peripheral wall 21 may have a uniform thickness over the entire circumferential direction. Even with this configuration, since the screw hole 25a serves as a thermal resistance in the peripheral wall 21, the second thermal resistance portion (that is, the welding groove 34 or the key groove 41) of the stator core 31 is provided inside the screw hole 25a in the radial direction. By arranging the arrangement, the same effect as that of the above embodiment can be obtained.
  • the heat radiation fin 26 of the above embodiment is integrally molded with the peripheral wall 21, but the present invention is not limited to this, and the heat radiation fin 26 may be configured as a separate body from the peripheral wall 21.
  • the housing 12 of the above embodiment may be configured by omitting the heat radiation fins 26.
  • a cooling structure for circulating a cooling liquid may be added inside.
  • the output unit 18 is not limited to the propeller fan, and the configuration of the output unit 18 can be appropriately changed according to the application of the rotary electric machine 11.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Motor Or Generator Frames (AREA)
  • Motor Or Generator Cooling System (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)

Abstract

La présente invention concerne une machine tournante électrique (11) comprenant : un logement cylindrique (12) ; et un noyau de stator (31) qui est formé de façon annulaire dans le sens circonférentiel du logement et fixé à la surface circonférentielle interne du logement. Le logement comporte des premières parties résistantes à la chaleur (25) partiellement disposées dans le sens circonférentiel. Les premières parties résistantes à la chaleur ont des résistances à la chaleur supérieures à celles d'une partie (21a) qui est une partie autre que les premières parties résistantes à la chaleur dans le sens circonférentiel du logement. Le noyau de stator comporte des secondes parties résistantes à la chaleur (34, 41) partiellement disposées dans le sens circonférentiel. Les secondes parties résistantes à la chaleur ont des résistances à la chaleur supérieures à celles d'une partie (32a) qui est une partie autre que les secondes parties résistantes à la chaleur dans le sens circonférentiel du noyau de stator. Les secondes parties résistantes à la chaleur sont situées radialement à l'intérieur des premières parties résistantes à la chaleur.
PCT/JP2020/023739 2019-06-27 2020-06-17 Machine tournante électrique WO2020262139A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2019119522A JP7251355B2 (ja) 2019-06-27 2019-06-27 回転電機
JP2019-119522 2019-06-27

Publications (1)

Publication Number Publication Date
WO2020262139A1 true WO2020262139A1 (fr) 2020-12-30

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PCT/JP2020/023739 WO2020262139A1 (fr) 2019-06-27 2020-06-17 Machine tournante électrique

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WO (1) WO2020262139A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014082935A (ja) * 2014-02-13 2014-05-08 Hitachi Automotive Systems Ltd 回転電機の固定子、およびこれを備えた回転電機
JP2019022250A (ja) * 2017-07-11 2019-02-07 三菱電機株式会社 電動機ケース部品、電動機、換気扇および押出成形部品
WO2019043767A1 (fr) * 2017-08-29 2019-03-07 三菱電機株式会社 Moteur et dispositif de climatisation

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4864229B2 (ja) * 2001-05-17 2012-02-01 株式会社鶴見製作所 水中モータにおけるステータコアの回り止め構造
US9531221B2 (en) * 2012-02-27 2016-12-27 Nissan Motor Co., Ltd. Locking structure for stator core

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014082935A (ja) * 2014-02-13 2014-05-08 Hitachi Automotive Systems Ltd 回転電機の固定子、およびこれを備えた回転電機
JP2019022250A (ja) * 2017-07-11 2019-02-07 三菱電機株式会社 電動機ケース部品、電動機、換気扇および押出成形部品
WO2019043767A1 (fr) * 2017-08-29 2019-03-07 三菱電機株式会社 Moteur et dispositif de climatisation

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JP7251355B2 (ja) 2023-04-04
JP2021005970A (ja) 2021-01-14

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