WO1993017485A1 - Motor equipped with stator cooling means - Google Patents
Motor equipped with stator cooling means Download PDFInfo
- Publication number
- WO1993017485A1 WO1993017485A1 PCT/JP1993/000206 JP9300206W WO9317485A1 WO 1993017485 A1 WO1993017485 A1 WO 1993017485A1 JP 9300206 W JP9300206 W JP 9300206W WO 9317485 A1 WO9317485 A1 WO 9317485A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- laminated
- core
- housing
- resin material
- heat
- Prior art date
Links
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
- H02K1/20—Stationary parts of the magnetic circuit with channels or ducts for flow of cooling medium
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K9/00—Arrangements for cooling or ventilating
- H02K9/22—Arrangements for cooling or ventilating by solid heat conducting material embedded in, or arranged in contact with, the stator or rotor, e.g. heat bridges
- H02K9/223—Heat bridges
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K9/00—Arrangements for cooling or ventilating
- H02K9/19—Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil
- H02K9/197—Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil in which the rotor or stator space is fluid-tight, e.g. to provide for different cooling media for rotor and stator
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K9/00—Arrangements for cooling or ventilating
- H02K9/22—Arrangements for cooling or ventilating by solid heat conducting material embedded in, or arranged in contact with, the stator or rotor, e.g. heat bridges
- H02K9/227—Heat sinks
Definitions
- the present invention relates to an electric motor provided with a stator cooling means, and more particularly to a stator winding cooling means which absorbs heat generated by a winding wound around a status slot and thereby suppresses heat generation of the entire stator. It relates to the motor provided. Background art
- a structure in which heat of a stator is absorbed from a stator core or a structure in which heat of a rotor is absorbed via a rotating shaft has been used.
- an outer casing is closely fixed to the outer periphery of the stator core disposed around the rotor, and a cooling medium flow path is provided inside the external casing to transfer the heat of the stator core to the cooling medium.
- a structure has been already proposed in which the cooling effect is further improved by forming a cooling medium passage directly inside the stator core (for example, Japanese Patent Application No. 2-2636373).
- the stator of the electric motor can be cooled mainly by absorbing heat generated from the stator core.
- the heat generated by the stator includes not only heat generated from the stator core due to iron loss but also heat generated due to copper loss of the exciting winding wound around the stator core. Cooling the exciting winding by suppressing or effectively absorbing the heat generated by the copper loss prevents fluctuations in the electric motor output due to changes in the resistance of the winding, and contributes to improving the reliability of the motor. I do.
- the conventional cooling structure as described above cannot directly absorb the heat of the exciting winding.
- the present invention can further effectively cool the stator by absorbing not only the heat due to the iron loss of the stay core but also the heat due to the copper loss of the exciting winding wound around the stay core.
- An object of the present invention is to provide an electric motor provided with cooling means, thereby further improving the performance of the electric motor.
- the present invention provides a housing, a substantially cylindrical laminated stay core fixed to the inside of a housing, and having a plurality of slots in an inner peripheral portion, and a stacking stay core.
- a stator having a plurality of excitation windings wound around each of the core slots, a rotor rotatably disposed inside the stay, and at least the total axial length of the laminated stator core.
- the heat transfer member is filled with a granular material in each gap between the plurality of excitation windings and the inner wall surfaces of the plurality of slots of the laminated stay core and the inner wall surface of the housing, and It can also be formed from a thermally conductive composite resin material that is cured and molded by injecting a heat-resistant resin material in the molten state. Further, it is preferable that the particulate material mixed in the heat conductive composite resin material of the heat transfer member is made of aluminum oxide particles.
- the housing includes a pair of housing members that sandwich the laminated stay core in the axial direction, and a cooling medium passage is provided inside the laminated stay core and the pair of housing members. Conveniently, it extends continuously over the total length of the entire length in the linear direction and the protruding length of each coil end portion of the exciting winding.
- the heat due to the copper loss of the exciting winding wound around the laminated stay core is transmitted to the heat transfer member covering the exciting winding.
- the heat transfer member made of a composite resin material having excellent heat conductivity further conducts this heat to the laminated core and the housing. Then, the heat conducted to the laminated stay core and the housing is absorbed by the cooling medium passing through the cooling medium passage. At the same time, the heat due to the core loss of the laminated stay core is also absorbed by the cooling medium passing through the cooling medium passage. In this way, the heat of the exciting winding and the laminated stay core is efficiently absorbed by the cooling medium, and the stay is cooled effectively.
- FIG. 1 shows an electric motor provided with a cooling unit for stays according to an embodiment of the present invention.
- FIG. 2 is a longitudinal sectional view taken along the line I-I of FIG. 2,
- FIG. 2 is a plan view of a thin sheet core member forming a laminated stay core of the motor of FIG. 1, and
- FIGS. 3a and 3b are diagrams for explaining a molding process of the heat transfer member of the electric motor of FIG. 1.
- FIG. 3 is a cross-sectional view of the laminated stay core of the electric motor of FIG. 1 taken along line III-III of FIG.
- FIG. 1 shows a cross section of an electric motor provided with stay cooling means according to an embodiment of the present invention.
- This motor is disposed inside the motor and has a rotor 10 integrally having a rotating shaft 12 and a laminated stay core 1 disposed on the outer peripheral side of the motor and surrounding the rotor 10 at a predetermined interval. 4, and a stay 18 consisting of a plurality of excitation windings 16 wound around the laminated stay core 14.
- a front housing 20 and a rear housing 22 that support the rotating shaft 12 of the rotor 10 and sandwich the laminated stay core 14 are arranged respectively.
- the front housing 20 is provided with a bearing 24 in a central opening 20a, and rotatably supports a rotating shaft 12 integrated with the rotor 10.
- the rear housing 22 includes an annular member 22 a and a lid member 22 b that is tightly fitted to the annular member 22 a, and a bearing is provided in a central opening 22 c inside the lid member 22 b. 24 is arranged, and the rotation shaft 12 of the rotor 10 is similarly rotatably supported.
- the laminated stator core 14 is formed by laminating a number of thin steel cores 26 of silicon steel plates as shown in FIG. 2 in the axial direction of the electric motor.
- the thin plate core 26 is provided with an opening 26a for surrounding the rotor 10 at the center, and is provided with a plurality of slot holes 28a at the periphery of the opening 26a.
- the laminated stator core 14 is a thin plate core 2 with a thermosetting adhesive applied to both sides in advance.
- the above-described excitation winding 16 is wound around a plurality of slots 28 (see FIG. 3a) formed by stacking a number of thin plate cores 26 and communicating with the slot holes 28a. Is done.
- the thin plate core 26 forming the laminated stay core 14 has a plurality of coolant passages at four corners to form a coolant passage for cooling the stay 18. It has a hole 30a.
- these coolant passage holes 30a communicate with each other to form a coolant passage 30 (FIG. 1) extending in the axial direction inside the laminated stay core 14. You. Further, as shown in FIG.
- the housing 20 before sandwiching the laminated core 14, the housing 20 is provided with a coolant communication passage 32 at a position corresponding to the above-described coolant passage 30, and similarly in the rear.
- the housing 22 has a coolant communication passage 3. Further, the laminated stay core 14, the front housing 20, and the rear housing 22 are fixed to each other by a plurality of tie bolts (not shown).
- Figure 2 shows the port holes 36 for tie bolts.
- the coolant communication passages 32 and 34 of the front housing 20 and the rear housing 22 are provided inside the housings 20 and 22 at the four corners of the laminated stay core 14. Roads 30 communicate with each other.
- the rear housing 22 is provided with a coolant introduction path and a coolant discharge path (only one is indicated by 34a in FIG. 1) connected to an external coolant supply source.
- the coolant is introduced into the coolant channel 30 of the stay core 14, and the coolant is discharged from the coolant channel 30.
- one continuous coolant flow passage is formed from the coolant introduction passage to the coolant discharge passage via the plurality of coolant passages 30 and the respective coolant passages 32, 34.
- the coolant flow path 30 of the laminated core 14 and the coolant communication path 32 of the front housing 20 and A well-known O-ring 38 is provided at each connecting portion of the rear housing 22 and the communication passage 34 to ensure the sealing of each connecting portion.
- the exciting winding 16 wound around the laminated staying core 14 has a portion disposed in the slot 28 and coil end portions 4 protruding from both axial end surfaces of the laminated staying core 14.
- a heat transfer member 42 made of a heat conductive composite resin material described later.
- the thermally conductive composite resin material is formed by mixing a highly heat-conductive and electrically insulating granular material such as aluminum oxide as a filler into a resin having excellent heat resistance and moldability such as an epoxy resin. is there.
- the heat conductive composite resin material is applied between the exciting winding 16 and the inner wall surface of the slot 28 of the laminated stay core 14 and the inner wall surfaces of the front housing 20 and the rear housing 22.
- the thermal connection is made between the inner wall surface of the excitation coil 16 and the inner wall surface of the front housing 20 and the rear housing 22. Therefore, the heat generated in the exciting winding 16 is transferred to the laminated stay core 14, the front housing 20, and the rear housing 22 via the heat transfer member 42 made of a heat conductive composite resin material. Is transmitted well.
- Each of the laminated cores 14, front housing 20, and rear housing 22 has a coolant flow path.
- a coolant communication passage 32, and a coolant communication passage 34 are provided over the entire length of the exciting winding 16 in the axial direction, and the laminated stay core 14 and the housings 20, 2 are provided.
- the heat transferred to 2 is effectively absorbed by the coolant flowing through coolant channel 30 and coolant communication passages 32 and 34.
- the molding process of the heat transfer member 42 using the above-described heat conductive composite resin material will be described below with reference to FIGS. 3A and 3B.
- a plurality of slots of a laminated steel core 14 formed by laminating a number of thin plate cores 26 are formed.
- the stator winding 18 is formed by winding the exciting winding 16 around the contact 28.
- the stage 18 formed in this way is connected to a pair of molds as shown in Fig. 3a.
- the upper mold 46 is provided with a plurality of gates 48. Cores 50, 52, and 54 are placed in the central cavity portion of the stay 18 where the mouth 10 is to be placed and the portion where resin is not injected in the front and rear portions in the axial direction. Deploy. In this arrangement, when the thermally conductive composite resin material 56 containing the above-mentioned filler is injected in a molten state from the gate 48 of the upper mold 46, the thermally conductive composite resin material 56 is lowered by gravity. Then, it reaches the lower mold 44 through the gap between each slot 28 of the laminated steel core 14 and the exciting winding 16.
- the other gates 48 act as air vent holes.
- the thermally conductive composite resin material 56 is injected into the annular cavity 58 between the lower mold 44 and the core 50, and then the slot 28 and the core 5 A plurality of gaps 60 between 2 and the exciting winding 16 and an annular cavity 62 between the upper mold 46 and the core 54 are injected. Thereafter, the heat conductive composite resin material 56 is appropriately cured at room temperature or by heating to form the heat transfer member 42 over the gaps 60 and the cavities 58, 62 (see FIG. 3B). .
- the gap between the slot 28 of the laminated stay core 14 and the exciting winding 16 is narrow, and in the above method, the heat conductive composite resin material is applied to each gap and the cavity. If 56 cannot be sufficiently injected, the heat conductive composite resin material 56 may be injected separately while being separated into a resin material and a filler. That is, first the lower cavity
- the stator 18 in which the heat transfer member 42 surrounding the exciting winding 16 was formed in the slot 28 of the laminated stay core 14 and at the front and rear ends in the axial direction, as described above.
- the electric motor shown in FIG. 1 is formed.
- it is necessary to improve the molding accuracy of the heat transfer member 42 so that the heat transfer member 42 and the inner surfaces of the front housing 20 and the rear housing 22 are in close contact with each other. For this reason, it is actually preferable to employ the second molding method described above.
- the cooling medium that cools the laminated stay core 14 and the exciting winding 16 is described as the cooling liquid.
- the present invention can also be applied to an air-cooled electric motor using cooling air.
- a cooling structure in which a cooling medium flow path is provided in an external housing that is closely fixed to the outer periphery of the laminated stay core can also be applied to the present invention.
- the present invention is directed to a motor housing and / or a laminated stay core extending over the entire length of the laminated stay core and the projecting length of the coil end portion of the exciting winding wound around the laminated stay core.
- a cooling medium passage through which the cooling medium passes is extended, and the space between the exciting winding and the inner wall surface of the slot and the inner wall surface of the housing is covered with the exciting winding to cover the laminated stay core and the housing.
- a heat transfer member that thermally connects the A structure in which a heat member is molded from a heat conductive composite resin material and heat of a plurality of excitation windings is absorbed by a cooling medium passing through a cooling medium passage via a heat transfer member, a laminated stay core, and a housing. And Therefore, the heat of the exciting winding and the laminated stay core is efficiently absorbed by the cooling medium, and the stay is cooled more effectively, thereby reducing the heat loss of the motor and further improving the performance. improves.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Motor Or Generator Cooling System (AREA)
- Iron Core Of Rotating Electric Machines (AREA)
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE69307422T DE69307422T2 (de) | 1992-02-21 | 1993-02-19 | Mit ständerkühlmitteln ausgerüsteter motor |
EP93904326A EP0581966B1 (en) | 1992-02-21 | 1993-02-19 | Motor equipped with stator cooling means |
KR93703145A KR0135988B1 (en) | 1992-02-21 | 1993-10-15 | Motor equipped with stator cooling means |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4/35264 | 1992-02-21 | ||
JP4035264A JP2823412B2 (ja) | 1992-02-21 | 1992-02-21 | 電動機の冷却装置 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1993017485A1 true WO1993017485A1 (en) | 1993-09-02 |
Family
ID=12436950
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP1993/000206 WO1993017485A1 (en) | 1992-02-21 | 1993-02-19 | Motor equipped with stator cooling means |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0581966B1 (ja) |
JP (1) | JP2823412B2 (ja) |
KR (1) | KR0135988B1 (ja) |
DE (1) | DE69307422T2 (ja) |
WO (1) | WO1993017485A1 (ja) |
Cited By (2)
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US20150188385A1 (en) * | 2013-12-30 | 2015-07-02 | Samsung Electro-Mechanics Co., Ltd. | Spindle motor |
EP3376647A1 (en) * | 2017-03-17 | 2018-09-19 | Nidec Corporation | Blower and vacuum cleaner |
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---|---|---|---|---|
EP0632566A1 (en) * | 1993-06-30 | 1995-01-04 | Simmonds Precision Engine Systems, Inc. | Apparatus and methods for heat dissipation in electromechanical devices |
DE19716758C2 (de) * | 1997-04-12 | 2002-01-10 | System Antriebstechnik Dresden | Gehäuselose elektrische Maschine mit mehreren unmittelbar fluiddurchströmten axialen Kühlkanälen |
JPH10322942A (ja) * | 1997-05-21 | 1998-12-04 | Denso Corp | 回転電機 |
AU744424B2 (en) | 1997-07-21 | 2002-02-21 | Siemens Aktiengesellschaft | Electric motor pod drive system for a vessel with a cooling device |
DE29821564U1 (de) * | 1998-12-02 | 2000-07-13 | Impella Cardiotech Ag | Fluidgekühlter Elektromotor mit hoher Leistungsdichte |
CN1372715A (zh) * | 1999-08-03 | 2002-10-02 | 西门子公司 | 防消磁的、永磁体励磁的船用驱动装置 |
DE19954314A1 (de) * | 1999-11-11 | 2001-05-17 | Hilti Ag | Elektromotor |
DE19957942C1 (de) * | 1999-12-02 | 2001-03-08 | Fortuna Werke Maschf Ag | Motorspindel für eine Werkzeugmaschine, insbesondere Hochfrequenz-Motorspindel |
JP3502589B2 (ja) * | 2000-02-10 | 2004-03-02 | 三菱電機株式会社 | 交流発電機 |
JP3806303B2 (ja) | 2000-12-11 | 2006-08-09 | 三菱重工業株式会社 | 発電機における冷却構造 |
US20020089240A1 (en) | 2001-01-09 | 2002-07-11 | Du Hung T. | Electric motor having armature coated with a thermally conductive plastic |
US7814641B2 (en) | 2001-01-09 | 2010-10-19 | Black & Decker Inc. | Method of forming a power tool |
US7096566B2 (en) | 2001-01-09 | 2006-08-29 | Black & Decker Inc. | Method for making an encapsulated coil structure |
JP2003011889A (ja) * | 2001-06-29 | 2003-01-15 | Mitsubishi Heavy Ind Ltd | アジマス推進器 |
US6933633B2 (en) | 2001-10-03 | 2005-08-23 | Nissan Motor Co., Ltd. | Rotating electric machine and cooling structure for rotating electric machine |
KR100839471B1 (ko) * | 2001-12-28 | 2008-06-18 | 두산인프라코어 주식회사 | 전기모터의 냉각구조 |
DE20302709U1 (de) * | 2003-02-19 | 2004-07-29 | Intrasys Gmbh Innovative Transport-Systeme | Stator mit Wickelspulenkühlung |
DE10317593A1 (de) * | 2003-04-16 | 2004-11-18 | Siemens Ag | Elektrische Maschine mit gekühlten Ständer- und Läuferblechpaketen und Wicklungen |
DE102004050743A1 (de) * | 2004-10-19 | 2006-04-20 | Pfeiffer Vacuum Gmbh | Vibrationsarme Vakuumpumpe |
KR101221236B1 (ko) * | 2005-12-23 | 2013-01-11 | 두산인프라코어 주식회사 | 전동기의 냉각 구조장치 |
US7541701B2 (en) | 2006-06-07 | 2009-06-02 | A.O. Smith Corporation | Totally enclosed fan cooled motor |
US8358043B2 (en) * | 2008-10-24 | 2013-01-22 | Baker Hughes Incorporated | Enhanced thermal conductivity material in annular gap between electrical motor stator and housing |
CN103595172A (zh) * | 2009-08-27 | 2014-02-19 | 六逸科技股份有限公司 | 内部具有导热胶的马达 |
US8519582B2 (en) | 2009-09-29 | 2013-08-27 | Regal Beloit America, Inc. | Air cooled electric motor |
EP2378642B1 (en) * | 2010-04-13 | 2013-07-17 | Siemens Aktiengesellschaft | Electric machine |
JP5573330B2 (ja) * | 2010-04-23 | 2014-08-20 | 株式会社Ihi | モータ |
TWI424663B (zh) * | 2010-07-01 | 2014-01-21 | Joy Ride Tech Co Ltd | A motor with heat pipe |
US20130069455A1 (en) * | 2011-09-15 | 2013-03-21 | Colin J. Hamer | Electric machine module cooling system and method |
WO2013067627A1 (en) * | 2011-11-08 | 2013-05-16 | Tm4 Inc. | Cooling assembly for electric machines |
DE102015207865A1 (de) * | 2015-04-29 | 2016-11-03 | Continental Automotive Gmbh | Gehäuselose elektrische Maschine |
JP6672741B2 (ja) * | 2015-11-24 | 2020-03-25 | トヨタ紡織株式会社 | モータ及びこれを備える電動過給機 |
US10971975B2 (en) | 2016-12-14 | 2021-04-06 | American Axle & Manufacturing, Inc. | System and method for stator slot encapsulation using injected polymer |
JP2018155237A (ja) * | 2017-03-17 | 2018-10-04 | 日本電産株式会社 | 送風装置及び掃除機 |
DE102017208550A1 (de) * | 2017-05-19 | 2018-11-22 | Mahle International Gmbh | Elektrische Maschine, insbesondere für ein Fahrzeug |
CN110832746B (zh) * | 2017-07-10 | 2021-11-30 | 三菱电机株式会社 | 电动机、空气调节机、电动吸尘器以及电动机的制造方法 |
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DE102017221836A1 (de) * | 2017-12-04 | 2019-06-06 | Mahle International Gmbh | Elektrische Maschine, insbesondere für ein Fahrzeug |
DE102017221835A1 (de) * | 2017-12-04 | 2019-06-06 | Mahle International Gmbh | Elektrische Maschine, insbesondere für ein Fahrzeug |
US10615663B2 (en) | 2018-02-09 | 2020-04-07 | Deere & Company | Electrical motor cooling design |
CN110858744A (zh) * | 2018-08-23 | 2020-03-03 | 北京锋锐新源电驱动科技有限公司 | 一种具有强化散热性能的轮毂电机 |
CN111384820A (zh) * | 2018-12-27 | 2020-07-07 | 观致汽车有限公司 | 驱动电机冷却结构和具有该冷却结构的驱动电机 |
DE102019215693A1 (de) * | 2019-10-11 | 2021-04-15 | Robert Bosch Gmbh | Elektrische Maschine und Verfahren zur Herstellung der elektrischen Maschine |
US11843281B2 (en) * | 2021-10-01 | 2023-12-12 | Ford Global Technologies, Llc | Electric machine for vehicle |
US20230105407A1 (en) * | 2021-10-01 | 2023-04-06 | Ford Global Technologies, Llc | Electric machine for vehicle |
US11923738B2 (en) | 2021-10-01 | 2024-03-05 | Ford Global Technologies, Llc | Electric machine for vehicle |
EP4283841A1 (de) | 2022-05-24 | 2023-11-29 | Siemens Aktiengesellschaft | Verfahren zur herstellung eines stators einer dynamoelektrischen maschine |
WO2024024792A1 (ja) * | 2022-07-26 | 2024-02-01 | 日本ゼオン株式会社 | 駆動ユニット |
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1992
- 1992-02-21 JP JP4035264A patent/JP2823412B2/ja not_active Expired - Fee Related
-
1993
- 1993-02-19 EP EP93904326A patent/EP0581966B1/en not_active Expired - Lifetime
- 1993-02-19 WO PCT/JP1993/000206 patent/WO1993017485A1/ja active IP Right Grant
- 1993-02-19 DE DE69307422T patent/DE69307422T2/de not_active Expired - Fee Related
- 1993-10-15 KR KR93703145A patent/KR0135988B1/ko not_active IP Right Cessation
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JPS60121941A (ja) * | 1983-12-05 | 1985-06-29 | Fanuc Ltd | 液冷モ−タ |
JPH01198243A (ja) * | 1988-02-02 | 1989-08-09 | Fanuc Ltd | 液冷モータの冷却用管路接合構造 |
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Non-Patent Citations (1)
Title |
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See also references of EP0581966A4 * |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20150188385A1 (en) * | 2013-12-30 | 2015-07-02 | Samsung Electro-Mechanics Co., Ltd. | Spindle motor |
EP3376647A1 (en) * | 2017-03-17 | 2018-09-19 | Nidec Corporation | Blower and vacuum cleaner |
CN108626147A (zh) * | 2017-03-17 | 2018-10-09 | 日本电产株式会社 | 送风装置以及吸尘器 |
Also Published As
Publication number | Publication date |
---|---|
KR0135988B1 (en) | 1998-06-15 |
DE69307422T2 (de) | 1997-08-21 |
EP0581966A4 (en) | 1994-06-08 |
EP0581966A1 (en) | 1994-02-09 |
EP0581966B1 (en) | 1997-01-15 |
JP2823412B2 (ja) | 1998-11-11 |
JPH05236705A (ja) | 1993-09-10 |
DE69307422D1 (de) | 1997-02-27 |
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