WO2020059512A1 - Moteur sans noyau à balai plat - Google Patents

Moteur sans noyau à balai plat Download PDF

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Publication number
WO2020059512A1
WO2020059512A1 PCT/JP2019/034933 JP2019034933W WO2020059512A1 WO 2020059512 A1 WO2020059512 A1 WO 2020059512A1 JP 2019034933 W JP2019034933 W JP 2019034933W WO 2020059512 A1 WO2020059512 A1 WO 2020059512A1
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WO
WIPO (PCT)
Prior art keywords
brush
bracket
armature
heat
motor
Prior art date
Application number
PCT/JP2019/034933
Other languages
English (en)
Japanese (ja)
Inventor
雄一郎 定永
Original Assignee
パナソニックＩｐマネジメント株式会社
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 パナソニックＩｐマネジメント株式会社 filed Critical パナソニックＩｐマネジメント株式会社
Publication of WO2020059512A1 publication Critical patent/WO2020059512A1/fr

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K13/00—Structural associations of current collectors with motors or generators, e.g. brush mounting plates or connections to windings; Disposition of current collectors in motors or generators; Arrangements for improving commutation
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/02—Casings or enclosures characterised by the material 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
    • H02K5/14—Means for supporting or protecting brushes or brush holders
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K9/00—Arrangements for cooling or ventilating
    • H02K9/28—Cooling of commutators, slip-rings or brushes e.g. by ventilating

Definitions

  • the present invention relates to a flat brushless coreless motor used for a radiator cooling fan used for a motorcycle or an automobile or a condenser cooling fan used for a car air conditioner in a vehicle-mounted field.
  • the commutator motor it is required to prevent the brush constituting the portion for rectifying the current from being oxidized and deteriorated, thereby preventing abrasion from being promoted. Therefore, there is a strong demand for commutator motors to have improved heat radiation so that the brushes of the commutator motor do not exceed a certain temperature.
  • Patent Document 1 describes a structure in which a rectangular space, that is, an air groove is provided on the outer periphery of a brush holder. According to this configuration, it is shown that the heat radiation of the brush is improved by increasing the contact area between the brush and the air.
  • Patent Document 2 describes the following structure. That is, the pigtail connected to the brush is connected to the pigtail. An electrically insulating and thermally conductive sealing material is interposed between the plate and the bracket, which form a conductive portion for the brush. With this configuration, a heat dissipation structure is provided to allow heat to escape from the brush to the bracket side.
  • Patent Literature 1 is a structure in consideration of maintaining the motor size, particularly the size of the brush holder.
  • the space that the air space can take is too narrow. Therefore, in this structure, it is considered that heat easily stays in the air layer and it is difficult to obtain a heat radiation effect. Conversely, if the size of the air layer is set to a sufficient heat radiation effect by using this structure, the motor size may be increased.
  • the present invention solves the conventional problems.
  • the present invention provides a flat brushless coreless motor with a brush that ensures the reliability of the brush and has little reduction in life due to a rise in temperature even when the flat brushless coreless motor is used in a high temperature and wide temperature range.
  • the purpose is to:
  • the present invention is provided with the following configuration in order to efficiently radiate self-heating generated in the electric motor. That is, in the electric motor, the bracket as the heat radiating member and the cover plate are in contact with each other via the heat conductive molded body. Further, in the electric motor, a heat insulating material is located between the armature, which is a heating element, and the bracket. Thermal insulation has a lower thermal conductivity than air. Therefore, a heat path is formed in the electric motor for transmitting the heat of the brush to the bracket via the cover plate and the heat conductive molded body while preventing radiant heat from the armature.
  • the flat type brushless coreless motor includes an armature, a magnet, a housing, a bracket, a brush, a brush holder, a cover plate, and a heat conductive molded body. And a heat insulating material.
  • the armature integrally forms a shaft, a plurality of coils, and a commutator with a mold resin.
  • the shaft extends in the axial direction.
  • the plurality of coils are attached in a circumferential direction about the axis.
  • the commutator has a commutator piece connected to each of the plurality of coils.
  • the magnet is located facing the armature.
  • the housing holds the magnet.
  • the bracket is located to face the magnet with the armature and the gap therebetween.
  • the brush contacts the commutator.
  • the brush holder includes a groove in which the brush can move.
  • the cover plate covers the groove.
  • the heat conductive molding is located between the bracket and the cover plate.
  • the heat insulating material is located between the armature and the bracket. Thermal insulation has a lower thermal conductivity than air.
  • the first aspect of the present invention it is possible to secure electrical insulation and to prevent a short circuit between the cover plate and the bracket adjacent to the brush. That is, according to this aspect, a heat insulating material having a lower thermal conductivity than air can be in contact with the bracket between the bracket and the armature without contacting the armature. Therefore, according to this aspect, it is possible to prevent the bracket from receiving the heat generated by the armature that is the heat generating portion. Therefore, the coreless motor of the present embodiment can efficiently insulate heat. For this reason, the coreless motor of this aspect can effectively radiate the heat of the brush from the bracket, so that the temperature of the brush can be reduced. Therefore, in the coreless motor according to the present embodiment, the wear resistance of the brush is improved, and the life of the motor can be extended.
  • the heat insulating material is preferably formed by impregnating a sheet-like material to be impregnated (for example, a nonwoven fabric) with a heat insulating material and sandwiching the film-like or sheet-like resin.
  • the heat insulating material is used by punching into an arbitrary shape.
  • the thermally conductive molded body has rubber elasticity.
  • the thermally conductive molded body can suppress vibration and noise with backlash generated by the clearance between the brush and the brush holder due to a damping effect, and can improve quietness.
  • the heat insulating material is impregnated with a heat insulating material containing silica xerogel (Silica @ Xerogel) having high heat resistance.
  • the coreless motor of this aspect can ensure sufficient heat resistance in a high-temperature environment such as an on-vehicle use. Therefore, according to the present embodiment, the coreless motor of the present embodiment can obtain a heat insulating structure excellent in cost and moldability.
  • the thermally conductive molded body is a silicone rubber or an acrylic rubber.
  • the coreless motor of the present aspect in a high temperature environment, can ensure high reliability and heat dissipation.
  • FIG. 1A is a bottom view of the motor according to the first embodiment of the present invention.
  • FIG. 1B is a side view of the motor according to the first embodiment of the present invention.
  • FIG. 1C is a top view of the motor according to the first embodiment of the present invention.
  • FIG. 2 is an exploded view of the motor according to the first embodiment of the present invention.
  • FIG. 3 is a sectional view of the motor according to the first embodiment of the present invention.
  • FIG. 4 is a sectional view of a conventional motor.
  • Flat brushless coreless motors used around the engine room of vehicles are used, for example, in radiator cooling fans or condenser cooling fans for car air conditioners.
  • a flat brushless coreless motor for a radiator cooling fan used in a vehicle will be described as an example.
  • a flat brushless coreless motor may be simply referred to as a motor.
  • FIG. 1A is a bottom view of the motor according to Embodiment 1 of the present invention.
  • FIG. 1B is a side view of the motor according to Embodiment 1 of the present invention.
  • FIG. 1C is a top view of the motor according to Embodiment 1 of the present invention.
  • FIG. 2 is an exploded view of the motor according to the first embodiment of the present invention.
  • FIG. 3 is a sectional view of the motor according to the first embodiment of the present invention. In FIG. 3, the right side shows an enlarged part of the motor.
  • FIG. 4 is a sectional view of a conventional motor. In FIG. 4, the right side shows an enlarged part of a conventional motor.
  • the flat brushless coreless motor 100 includes a housing 10, a bracket 11, a brush holder 15, an armature 14, and the like.
  • the magnetic circuit included between the housing 10 and the bracket 11 will be described.
  • the housing 10 is formed into a substantially thin cup shape by processing an iron plate. Similarly, a flange used for assembling with the bracket 11 is formed by processing an iron plate.
  • the housing 10 and the bracket 11 are fitted and fixed by means such as press-fitting, screwing, or bonding with a sealant.
  • a bearing 13a is held on the output shaft side of the housing 10.
  • a magnet 12 made of a permanent magnet is adhered and fixed.
  • the housing 10 and the bracket 11 include an armature 14 via a gap.
  • the magnet 12 has magnetic poles of N poles and S poles alternately, and is magnetized, for example, with four poles or six poles.
  • the armature 14 has a configuration in which a shaft 14a, a commutator 14b, and a coil 14c are integrally formed with a mold resin 14d.
  • the plurality of coils 14c wound with copper wires are connected to commutator pieces of the commutator 14b by fusing or the like. In order to make the drawings easy to understand, details of the commutator pieces are not shown.
  • the armature 14 is located between the magnet 12 and the bracket 11 with a gap therebetween.
  • the bracket 11 also serves as a back yoke as a magnetic circuit. With this configuration, the armature 14 forms a magnetic circuit by the magnet 12 and the bracket 11 that are located opposite to each other.
  • the bracket 11 includes a bearing receiving portion into which the bearing 13b is inserted. The bearing receiving portion holds and fixes the bearing 13b.
  • the power supply unit included between the brush holder 15 and the bracket 11 will be described.
  • the brush holder 15 is formed of a thermosetting resin so as to withstand high temperatures.
  • the brush holder 15 includes a groove 15d in which the brush 15a can move.
  • the brush 15a supplies power to the commutator 14b by rubbing against and contacting the commutator 14b.
  • the cover plate 15b covers the groove 15d.
  • the cover plate 15b is made of metal and covers the groove 15d so as to cover it.
  • the brush holder 15 forms a brush box with the cover plate 15b covering the groove 15d.
  • a spring 15c for applying pressure to the brush 15a is incorporated in the brush box, that is, in a space surrounded by the brush holder 15 and the cover plate 15b.
  • the spring 15c applies pressure to the brush 15a to stabilize the operation in which the brush 15a slides on and contacts the commutator 14b.
  • the brush 15a is connected to an external power supply harness (not shown) via a pigtail attached to the brush 15a.
  • the brush holder 15 and the bracket 11 are fixed by means such as screwing.
  • a heat insulating material 30 is located between the bracket 11 and the armature 14.
  • the heat insulating material 30 thermally separates radiant heat (the hatched arrow in FIG. 3) from the armature 14 serving as a heat generating portion.
  • the heat insulating material 30 is formed by sandwiching a sheet of nonwoven fabric impregnated with a heat insulating material with a film. A sheet-like material to be impregnated made of glass wool is used for the nonwoven fabric.
  • silica xerogel shown in (Table 1) is used as the heat insulating material.
  • the silica xerogel used in the present embodiment has a thermal conductivity of about 0.017 W / m ⁇ K.
  • a glass cloth is used for the film.
  • the film in which such a heat insulating material is sandwiched is punched into an arbitrary shape. Table 1 compares the properties of heat insulating materials formed from various materials.
  • the heat (solid arrow in FIG. 3) of the brush 15 a which is a power supply unit and the other heating element, is transmitted to the bracket 11 via the heat conductive molded body 20 via the metal cover plate 15 b. .
  • the heat transmitted to the bracket 11 is radiated from the bracket 11 to the outside.
  • the heat conductive molded body 20 has electrical insulation, heat conductivity, and rubber elasticity.
  • the heat of the brush 15 a can be sufficiently transmitted to the bracket 11 by using the heat conductive molded body 20 and the heat insulating material 30 together. Therefore, it is possible to prevent adverse effects such as the temperature of the brush 15a further increasing due to the reverse flow of heat from the armature 14, which is considered when only the heat conductive molded body 20 is used.
  • a conventional motor 101 will be described.
  • the conventional motor 101 shown in FIG. 4 there is no heat insulating material corresponding to the heat insulating material 30 of the present embodiment. Therefore, in the conventional motor 101, heat from the armature 114 is transmitted to the brush 115a through the bracket 111, as indicated by the hatched arrow in FIG. That is, the conventional motor 101 suffers from an adverse effect such as a further increase in the temperature of the brush 115a.
  • the heat conductive molded body 20 has rubber elasticity. Therefore, the motor 100 in the present embodiment suppresses rattling vibration and noise due to the clearance generated between the brush 15a and the brush holder 15 due to the damping effect of the thermally conductive molded body 20. Motor 100 in the present embodiment has improved quietness.
  • the flat type brushless coreless motor 100 includes the armature 14, the magnet 12, the housing 10, the bracket 11, the brush 15a, the brush holder 15, and the cover plate 15b. , A heat conductive molded body 20 and a heat insulating material 30.
  • the armature 14 has a shaft 14a, a plurality of coils 14c, and a commutator 14b, which are integrally formed with a mold resin 14d.
  • the shaft 14a extends in the direction of the axis C.
  • the plurality of coils 14c are attached in a circumferential direction about the axis C.
  • the commutator 14b has a commutator piece connected to each of the plurality of coils 14c.
  • the magnet 12 is located so as to face the armature 14.
  • the housing 10 holds a magnet 12.
  • the bracket 11 is positioned to face the magnet 12 with the armature 14 and the gap therebetween.
  • the brush 15a contacts the commutator 14b.
  • the brush holder 15 includes a groove 15d in which the brush 15a can move.
  • the cover plate 15b covers the groove 15d.
  • the heat conductive molding 20 is located between the bracket 11 and the cover plate 15b.
  • the heat insulating material 30 is located between the armature 14 and the bracket 11. The heat insulating material 30 has a lower thermal conductivity than air.
  • the flat type brushless coreless motor 100 according to the present embodiment electrical insulation can be ensured and a short circuit between the cover plate 15b adjacent to the brush 15a and the bracket 11 can be prevented. Further, by using motor 100 according to the present embodiment, it is possible to prevent heat generated by armature 14 serving as a heat generating portion from being received by bracket 11. Therefore, the motor 100 according to the present embodiment can be efficiently insulated. Therefore, the motor 100 according to the present embodiment can effectively radiate the heat of the brush 15a from the bracket 11. Therefore, motor 100 according to the present embodiment can lower the temperature of brush 15a. Therefore, the motor 100 according to the present embodiment has improved wear resistance and can have a longer motor life.
  • the heat insulating material 30 is impregnated with a heat insulating material containing silica xerogel.
  • the flat brushless coreless motor according to the present embodiment can secure sufficient heat resistance for use in a high-temperature environment such as in-vehicle use.
  • the motor of the present embodiment when the motor is used at a high temperature, the reliability of the brush is secured, and the life of the brushless motor due to the temperature rise is small, and the flat brushless coreless motor with high quietness is realized. it can.
  • the heat conductive molded body 20 shown in FIG. 3 is made of silicone rubber.
  • the thermally conductive molded body 20 may be made of acrylic rubber.
  • Table 2 is a table showing characteristics of the thermally conductive molded body 20 molded using various materials.
  • the heat conductive molded body 20 when the heat conductive molded body 20 is formed using silicone rubber or acrylic rubber, the heat conductive molded body 20 having heat resistance that can withstand even in a high temperature environment such as in-vehicle use is obtained. be able to.
  • the thermally conductive molded body 20 is located between the metal cover plate 15b and the bracket 11. Therefore, since the thermally conductive molded body 20 has elastic force, it can reduce the stress generated by vibration, and can obtain high reliability. Further, by using the heat conductive molded body 20, the heat generated by the brush 15a, which is a heating element, can be efficiently radiated, so that a highly reliable flat brushless coreless motor can be realized.
  • the heat conductive molded body be silicone rubber or acrylic rubber.
  • the present invention is not limited to the flat type brushless coreless motor and the one shown in the drawings in the above embodiment.
  • the present invention can be implemented by variously changing the design without departing from the gist of the present invention.
  • the flat brushless coreless motor according to the present invention can have a long life. Therefore, the present invention can be applied not only to in-vehicle use but also to industrial use or home electric appliance use. In particular, it is useful in the field used under a high temperature environment.

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

Abstract

La présente invention porte sur un moteur sans noyau à balai plat comprenant : une armature ; un aimant ; un boîtier ; un support ; un balai ; un porte-balai ; une plaque de couvercle ; un corps moulé thermoconducteur ; et un matériau d'isolation thermique. L'armature est moulée d'un seul tenant avec un arbre, une pluralité de bobines et un commutateur à l'aide d'une résine de moulage. L'aimant est positionné face à l'armature. Le boîtier maintient l'aimant. Le support est positionné face à l'aimant, prenant en sandwich l'armature et un vide. Le porte-balai comporte une rainure dans laquelle le balai peut se déplacer. La plaque de couvercle recouvre la rainure. Le corps moulé thermoconducteur est positionné entre le support et la plaque de couvercle. Le matériau d'isolation thermique est positionné entre l'armature et le support. Le matériau d'isolation thermique possède une conductivité thermique inférieure à celle de l'air.
PCT/JP2019/034933 2018-09-18 2019-09-05 Moteur sans noyau à balai plat WO2020059512A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2018-173172 2018-09-18
JP2018173172 2018-09-18

Publications (1)

Publication Number Publication Date
WO2020059512A1 true WO2020059512A1 (fr) 2020-03-26

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PCT/JP2019/034933 WO2020059512A1 (fr) 2018-09-18 2019-09-05 Moteur sans noyau à balai plat

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WO (1) WO2020059512A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10543219B2 (en) 2010-04-12 2020-01-28 Clarus Therapeutics, Inc. Oral testosterone ester formulations and methods of treating testosterone deficiency comprising same
US11179402B2 (en) 2005-04-15 2021-11-23 Clarus Therapeutics, Inc. Pharmaceutical delivery systems for hydrophobic drugs and compositions comprising same

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5417018U (fr) * 1977-07-08 1979-02-03
JPS57197752U (fr) * 1981-06-11 1982-12-15
JPS6288449U (fr) * 1985-11-25 1987-06-05
JPH08223848A (ja) * 1995-02-07 1996-08-30 Sawafuji Electric Co Ltd 回転電機
JPH09157440A (ja) * 1995-12-13 1997-06-17 Mitsubishi Electric Corp 樹脂組成物およびその樹脂組成物により封止された樹脂モールドモータ、樹脂封止型半導体装置、並びに、その樹脂組成物の硬化方法
JP2002305853A (ja) * 2001-03-30 2002-10-18 Railway Technical Res Inst 全閉式回転電機
JP2004147499A (ja) * 2003-12-24 2004-05-20 Matsushita Electric Ind Co Ltd 樹脂モールド電機子の製造方法
JP2011035962A (ja) * 2009-07-30 2011-02-17 Mitsuba Corp 電動モータ
JP2011200041A (ja) * 2010-03-19 2011-10-06 Mitsubishi Electric Corp 回転電機
JP2013070501A (ja) * 2011-09-22 2013-04-18 Panasonic Corp 扁平型ブラシ付コアレスモータ

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5417018U (fr) * 1977-07-08 1979-02-03
JPS57197752U (fr) * 1981-06-11 1982-12-15
JPS6288449U (fr) * 1985-11-25 1987-06-05
JPH08223848A (ja) * 1995-02-07 1996-08-30 Sawafuji Electric Co Ltd 回転電機
JPH09157440A (ja) * 1995-12-13 1997-06-17 Mitsubishi Electric Corp 樹脂組成物およびその樹脂組成物により封止された樹脂モールドモータ、樹脂封止型半導体装置、並びに、その樹脂組成物の硬化方法
JP2002305853A (ja) * 2001-03-30 2002-10-18 Railway Technical Res Inst 全閉式回転電機
JP2004147499A (ja) * 2003-12-24 2004-05-20 Matsushita Electric Ind Co Ltd 樹脂モールド電機子の製造方法
JP2011035962A (ja) * 2009-07-30 2011-02-17 Mitsuba Corp 電動モータ
JP2011200041A (ja) * 2010-03-19 2011-10-06 Mitsubishi Electric Corp 回転電機
JP2013070501A (ja) * 2011-09-22 2013-04-18 Panasonic Corp 扁平型ブラシ付コアレスモータ

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11179402B2 (en) 2005-04-15 2021-11-23 Clarus Therapeutics, Inc. Pharmaceutical delivery systems for hydrophobic drugs and compositions comprising same
US10543219B2 (en) 2010-04-12 2020-01-28 Clarus Therapeutics, Inc. Oral testosterone ester formulations and methods of treating testosterone deficiency comprising same
US10617696B2 (en) 2010-04-12 2020-04-14 Clarus Therapeutics, Inc. Oral testosterone ester formulations and methods of treating testosterone deficiency comprising same

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