WO2019212142A1 - Moteur à courant continu sans balai ayant un capot moulé pour protection de masse - Google Patents

Moteur à courant continu sans balai ayant un capot moulé pour protection de masse Download PDF

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Publication number
WO2019212142A1
WO2019212142A1 PCT/KR2019/002975 KR2019002975W WO2019212142A1 WO 2019212142 A1 WO2019212142 A1 WO 2019212142A1 KR 2019002975 W KR2019002975 W KR 2019002975W WO 2019212142 A1 WO2019212142 A1 WO 2019212142A1
Authority
WO
WIPO (PCT)
Prior art keywords
coupled
bearing
motor
shaft
cover
Prior art date
Application number
PCT/KR2019/002975
Other languages
English (en)
Inventor
Jeong Cheol Jang
Kyoung Joo Lee
Byung Soo Kim
Hyun Sung Yang
Original Assignee
New Motech Co., Ltd.
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 New Motech Co., Ltd. filed Critical New Motech Co., Ltd.
Priority to CN201980013134.8A priority Critical patent/CN111712998B/zh
Publication of WO2019212142A1 publication Critical patent/WO2019212142A1/fr

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
    • H02K11/40—Structural association with grounding devices
    • 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
    • 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
    • H02K5/16—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields
    • H02K5/173—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields using bearings with rolling contact, e.g. ball bearings
    • H02K5/1732—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields using bearings with rolling contact, e.g. ball bearings radially supporting the rotary shaft at both ends of the rotor
    • 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
    • H02K5/22—Auxiliary parts of casings not covered by groups H02K5/06-H02K5/20, e.g. shaped to form connection boxes or terminal boxes
    • H02K5/225—Terminal boxes or connection arrangements
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/08—Structural association with bearings
    • H02K7/083—Structural association with bearings radially supporting the rotary shaft at both ends of the rotor

Definitions

  • the present invention relates to the ground structure of the motor. More specifically, the present invention relates to a motor with a ground structure having improved performance and durability, and less vibration and noise by improving the ground structure to prevent electrolytic corrosion of the bearing more effectively, and protecting the grounding part by using a mold cover.
  • motors comprise stators and rotors.
  • the rotor rotates being affected by the magnetic field formed by the stator.
  • the shaft which is coupled to the rotor to rotate together with the rotor has a bearing supporting the rotation of the shaft installed at an upper part and a lower part of the rotor.
  • Such motors are controlled by a driving circuit. Electrolytic corrosion occurs to the bearing by the potential difference generated between the upper bearing and the lower bearing when the driving circuit operates, or by the axial direction current generated for another reason. When a motor operates by such electrolytic corrosion, noise and vibration occur, which badly affect the performance of the motor and the durability of the motor.
  • Korean Patent Laid-Open No. 10-2008-0109168 discloses a technology preventing electrolytic corrosion of the bearing by connecting the output side bracket enclosing the upper bearing and the opposite output side bracket enclosing the lower bearing with a conductive tape to make the potential of both sides to be equipotential.
  • the structure of the part fixing the end of the conductive tape is weak, and thus there may be problems in maintaining equipotentiality.
  • Korean Patent No. 10-1562736 discloses a structure in which a metal member for grounding is installed at an outer side of the motor housing so as to directly connect an upper end and a lower end of the metal member for grounding to an upper bearing cover and a lower bearing cover.
  • ground connection is made effectively between the upper bearing cover and the lower bearing cover, but since it has a structure inserting the bearing into the outside of the upper bearing cover and the lower bearing cover, the two bearings are easily exposed to the outside.
  • an end of the metal member for grounding is slightly in contact with the lower bearing cover, it is likely that the ground member may be isolated, and accordingly there may be a problem that the electrolytic corrosion of the bearing is not prevented effectively.
  • the present inventors suggest a motor with improved ground structure that has not been suggested in the prior art, which has a new structure that can protect grounding by using a mold cover while effectively preventing the penetration of water into the bearing side.
  • the brushless DC motor according to the present invention comprises:
  • a housing 10 comprising a stator 15 in the inside, and having a hollow part 11 in which a rotor 20 coupled to a shaft 21 is positioned in the middle part;
  • an upper bearing cover 31 accommodating the upper bearing 22 and covering the hollow part 11;
  • a lower bearing 23 coupled to a lower end of the shaft 21 to rotatably support the shaft
  • a lower bearing holder 32 accommodating the lower bearing 23 and coupled to a middle protrusion 14 protruding from the middle of a lower part of the housing 10;
  • first grounding member 50 having an upper end part 50a bendingly coupled to an outer part of the upper bearing cover 31, and a lower end part 50b coupled to a middle part of the lower bearing holder 32, so as to make the upper bearing cover 31 and the lower bearing holder 32 electrically equipotential;
  • a mold cover 42 covering a lower part of the middle protrusion 14 and part of the first grounding member 50 together.
  • the first grounding member 50 is positioned on a first groove 13 formed to be connected to the upper surface and the side surface of the housing 10, and a lower groove 13a which is in communication with the first groove 13 and is formed to be connected to the bottom surface of the housing 10.
  • the mold cover 42 may have a middle covering part 42a, which is a part covering the lower opening part 14a formed to have part of the lower bearing holder 32 exposed on a lower part in the middle of the housing 10.
  • the mold cover 42 may have an insertion protrusion 42b formed to fit into the lower opening part 14a and the lower groove 13a.
  • the lower end part 50b has a bent shape, and the end of the bent shape is interposed between the lower bearing 23 and the lower bearing holder 32.
  • the lower end part 50b of the first grounding member 30 is coupled to a second groove 32a formed on the lower bearing holder 32.
  • the present invention has an effect of preventing the electrolytic corrosion of the bearing more effectively by effectively maintaining equipotentiality between the upper bearing and the lower bearing through the new structure of the ground member which contacts the lower bearing cover and the bearing simultaneously.
  • the present invention has an effect of stably fixing the grounding member and preventing the penetration of water into the motor by preventing the grounding member from being separated by applying a mold cover to the part in which the bearing is exposed and the grounding member.
  • Fig. 1 is a perspective view of the motor according to the present invention
  • Fig. 2 is an exploded perspective view of the motor according to the present invention.
  • Fig. 3 is an exploded bottom perspective view of the motor according to the present invention.
  • Fig. 4 is an exploded perspective view of the ground structure from the lower bearing cover side of the motor according to the present invention.
  • Fig. 5 is a cross sectional view taken along line A-A' of Fig. 1.
  • Fig. 1 is a perspective view of the motor 100 according to the present invention
  • Fig. 2 is an exploded perspective view of the motor 100 according to the present invention
  • Fig. 3 is an exploded bottom perspective view of the motor 100 according to the present invention.
  • the motor 100 may comprise a housing 10, a rotor 20, an upper bearing cover 31, a lower bearing holder 32, an upper protecting member 41 and a mold cover 42.
  • the housing 10 has a hollow part 11 where the space in the middle is hollow, and an annular flange part 12 upwardly protruding along an upper part of the hollow part 11.
  • a rotor 20 coupled to a shaft 21 to rotate together therewith is positioned in the hollow part 11.
  • a first groove 13 is a place where a first grounding member 50 is positioned.
  • the first groove 13 is formed from the flange part 12 or a part adjacent to the flange part 12 to be connected to the upper surface and the side surface of the housing 10.
  • a lower part of the first grounding member 50 is positioned on a lower groove 13a in communication with the first groove 13 and is formed on a bottom surface of the housing 10.
  • a lower protrusion 14 is downwardly protruding in the middle of a lower surface of the housing 10.
  • the lower groove 13a in communication with the first groove 13 may be formed to be extended up to a lower opening part 14a of the middle protrusion 14.
  • a lower opening part 14a where the bottom surface of the lower bearing holder 32 is exposed is formed on a bottom surface of the middle protrusion 14.
  • the middle protrusion 14 is upwardly protruding from the bottom surface of the housing 10, and a lower bearing holder 32 is coupled in the space therein.
  • a stator 15 is positioned inside the housing 10 positioned to face a side surface of the rotor 20.
  • the stator 15 is electrically connected to a printed circuit substrate 15a, and a connector 15b is connected to a lead wire (not shown) connected to an external power to be installed to supply an external power to the printed circuit substrate 15a.
  • Fig. 3 illustrates the stator 15 and the housing 10 to be separate parts. However, preferably, the stator 15, the printed circuit substrate 15a and the connector 15b are manufactured by injecting molding to be integrally formed with the housing 10 in an insert mold.
  • the rotor 20 comprises a magnet positioned to face the stator.
  • a shaft 21 is penetratingly coupled in the middle part of the rotor 20. Accordingly, the rotor 20 and the shaft 21 become one unit and rotate together.
  • a load such as a fan is coupled to an upper end of the shaft 21. In other words, the upper end of the shaft 21 becomes the output side.
  • An upper bearing 22 for supporting the rotation of the shaft 21 is coupled to a bottom part of the upper end of the shaft 21.
  • a lower bearing 23 is coupled to a lower end of the shaft 21 to support the rotation of the shaft 21.
  • An upper bearing cover 31 is coupled to cover the hollow part 11 of the housing 10 with a conductive material.
  • the circumferential part of the upper bearing cover 31 is coupled to the flange part 12 of the housing 10.
  • the middle part of the upper bearing cover 31 has an upwardly protruding shape, and an upper bearing 22 is coupled to the inner side part of the protruding shape.
  • Fig. 2 illustrates that the upper bearing 22 is coupled to a lower side of the upper bearing cover 31, but the coupling shape is not limited thereto, and the protruding shape in the middle part of the upper bearing cover 31 may be changed so that the upper bearing 22 is coupled to an upper side of the upper bearing cover 31.
  • the upper part of the upper bearing cover 31 is covered by an upper protecting member 41 to be protected.
  • the lower bearing holder 32 is made of a conductive material and has the shape of a cup whose upper part is open, and a lower bearing 23 is coupled in the space in the middle.
  • a second groove 32a coupled to a lower end part 50b of the first grounding member 50 is formed on a bottom surface of the lower bearing holder 32.
  • a lower opening part 32b is formed in the middle of the bottom surface of the lower bearing holder 32, and the second groove 32a and the lower opening part 32b have a shape connected to one another.
  • Part of the bottom surface of the lower bearing holder 32 is exposed to the outside through the lower opening part 14b of the bottom surface of the housing 10.
  • the exposed part is covered by a mold cover 42.
  • a middle covering part 42a of the mold cover 42 is coupled to cover a lower opening part 14a.
  • the upper protecting member 41 and the mold cover 42 may have rubber or plastic of an elastic material applied thereto.
  • the mold cover 42 has a middle covering part 42a, which is a part covering the lower opening part 14a of the housing 10. Also, the mold cover 42 has a lower groove 13a in communication with a first groove 13 so that the part coupled to the bottom surface of the housing 10 of the first grounding member 50 is inserted, and an insertion protrusion 42b protrudingly formed to fit together with the lower opening part 14a.
  • This structure of the mold cover 42 prevents water from penetrating into the lower opening part 14a side. Also, by firmly fixing the lower part of the first grounding member 50 to the lower groove 13a, it is possible to prevent the coupling of the lower end part of the first grounding member 50 and the lower bearing holder 32 from being separated.
  • Fig. 4 is an exploded perspective view of the ground structure from the lower bearing holder 32 side of the motor 100 according to the present invention
  • Fig. 5 is a cross sectional view taken along line A-A' of Fig. 1.
  • the first grounding member 50 is coupled along the first groove 13 of the housing 10 to the lower groove 13a.
  • a grounding hole 50c is formed in the first grounding member 50 of a side surface part of the housing 10.
  • a second grounding member 51 is inserted into the grounding hole 50c so as to penetrate a side surface of the housing 10 and be coupled to a core part of the stator 15 inside the housing 10.
  • Fig. 5 illustrates that the second grounding member 51 is a bolt, but the second grounding member is not necessarily limited to a bolt, but other members such as a pin or screw, etc. may be used as far as it can be coupled to the grounding hole 50c to make the stator core and the first grounding member 50 electrically equipotential.
  • An upper end part 50a of the first grounding member 50 has a bent shape, and as can be seen from Fig. 5, it is pressedly inserted between the flange part 12 of the housing 10 and the outer peripheral part of the upper bearing cover 31 to be coupled thereto.
  • a lower end part 50b of the first grounding member 50 has a shape where the end thereof is bent in a "U" shape, and the bent part is coupled to a second groove 32a of the lower bearing holder 32.
  • the first grounding member 50 is coupled along the first groove 13 and the lower groove 13a, and has a bent shape so as to pass through the lower opening part 14a and allow the end part thereof to be coupled to a second groove 32a of the lower bearing holder 32.
  • the lower end part 50b which is the end part coupled to the second groove 32a, has a "U" shape.
  • the bent part at an end of the lower end part 50b of the first grounding member 50 is in contact with a bottom surface part 23a of the lower bearing 23.
  • the end of the lower end part 50b of the first grounding member 50 is interposed between the lower bearing 23 and the lower bearing holder 32 to be in contact with both members.

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

Abstract

Le moteur à courant continu sans balai selon la présente invention comprend : un carter 10 renfermant un stator 15 et ayant une partie creuse 11 dans la partie centrale de laquelle est positionné un rotor 20 couplé à un arbre 21 ; un palier supérieur 22 couplé à un côté de sortie de l'arbre 21 pour supporter l'arbre de manière rotative ; un capot de palier supérieur 31 logeant le palier supérieur 22 et recouvrant la partie creuse 11 ; un palier inférieur 23 couplé à une extrémité inférieure de l'arbre 21 pour supporter l'arbre de manière rotative ; un support de palier inférieur 32 logeant le palier inférieur 23 et couplé à une protubérance centrale 14 faisant saillie depuis le milieu d'une partie inférieure du carter 10 ; un premier élément de mise à la masse 50 ayant une partie d'extrémité supérieure 50a couplée de manière cintrée à une partie externe du capot de palier supérieur 31, et une partie d'extrémité inférieure 50b couplée à une partie centrale du support de palier inférieur 32 de sorte à mettre le capot de palier supérieur 31 et le support de palier inférieur 32 au même potentiel électrique ; et un capot moulé 42 recouvrant conjointement une partie inférieure de la protubérance centrale 14 et une partie du premier élément de mise à la masse 50.
PCT/KR2019/002975 2018-05-02 2019-03-14 Moteur à courant continu sans balai ayant un capot moulé pour protection de masse WO2019212142A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201980013134.8A CN111712998B (zh) 2018-05-02 2019-03-14 带接地保护铸模端盖的无刷直流电机

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR1020180050481A KR102030089B1 (ko) 2018-05-02 2018-05-02 접지 보호용 몰드 커버를 갖는 bldc 모터
KR10-2018-0050481 2018-05-02

Publications (1)

Publication Number Publication Date
WO2019212142A1 true WO2019212142A1 (fr) 2019-11-07

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Application Number Title Priority Date Filing Date
PCT/KR2019/002975 WO2019212142A1 (fr) 2018-05-02 2019-03-14 Moteur à courant continu sans balai ayant un capot moulé pour protection de masse

Country Status (3)

Country Link
KR (1) KR102030089B1 (fr)
CN (1) CN111712998B (fr)
WO (1) WO2019212142A1 (fr)

Cited By (1)

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Publication number Priority date Publication date Assignee Title
WO2021200480A1 (fr) * 2020-03-31 2021-10-07 株式会社富士通ゼネラル Moteur électrique

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CN112260463B (zh) * 2020-10-10 2024-08-20 珠海凯邦电机制造有限公司 一种一体式导电减震胶圈及电机
KR102408448B1 (ko) * 2022-01-21 2022-06-14 주식회사 이공기전 축전류 방지 및 제거 장치
KR102711517B1 (ko) 2022-08-22 2024-10-04 주식회사 모터온 음식물 분쇄기용 bldc모터의 전류누설 방지구조

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Publication number Priority date Publication date Assignee Title
US20080136273A1 (en) * 2006-11-20 2008-06-12 Emerson Electric Co. Motor end bell having terminal access opening and cover
JP2013081264A (ja) * 2011-09-30 2013-05-02 Fujitsu General Ltd モールドモータ
JP2014072908A (ja) * 2012-09-27 2014-04-21 Fujitsu General Ltd モールドモータ
KR20150106980A (ko) * 2014-03-12 2015-09-23 뉴모텍(주) 브러쉬리스 dc 모터
KR101562736B1 (ko) * 2014-05-07 2015-10-23 뉴모텍(주) 브러쉬리스 dc 모터의 접지 구조

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021200480A1 (fr) * 2020-03-31 2021-10-07 株式会社富士通ゼネラル Moteur électrique
JP2021164315A (ja) * 2020-03-31 2021-10-11 株式会社富士通ゼネラル 電動機
JP7415751B2 (ja) 2020-03-31 2024-01-17 株式会社富士通ゼネラル 電動機

Also Published As

Publication number Publication date
CN111712998A (zh) 2020-09-25
KR102030089B1 (ko) 2019-11-08
CN111712998B (zh) 2023-06-16

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