US20090035162A1 - Cooling fan - Google Patents
Cooling fan Download PDFInfo
- Publication number
- US20090035162A1 US20090035162A1 US11/845,740 US84574007A US2009035162A1 US 20090035162 A1 US20090035162 A1 US 20090035162A1 US 84574007 A US84574007 A US 84574007A US 2009035162 A1 US2009035162 A1 US 2009035162A1
- Authority
- US
- United States
- Prior art keywords
- cooling fan
- stator
- claws
- hub
- central tube
- Prior art date
- Legal status (The legal status 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 status listed.)
- Abandoned
Links
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/05—Shafts or bearings, or assemblies thereof, specially adapted for elastic fluid pumps
- F04D29/051—Axial thrust balancing
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D25/00—Pumping installations or systems
- F04D25/02—Units comprising pumps and their driving means
- F04D25/06—Units comprising pumps and their driving means the pump being electrically driven
- F04D25/0606—Units comprising pumps and their driving means the pump being electrically driven the electric motor being specially adapted for integration in the pump
- F04D25/0613—Units comprising pumps and their driving means the pump being electrically driven the electric motor being specially adapted for integration in the pump the electric motor being of the inside-out type, i.e. the rotor is arranged radially outside a central stator
- F04D25/062—Details of the bearings
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D25/00—Pumping installations or systems
- F04D25/02—Units comprising pumps and their driving means
- F04D25/06—Units comprising pumps and their driving means the pump being electrically driven
- F04D25/0606—Units comprising pumps and their driving means the pump being electrically driven the electric motor being specially adapted for integration in the pump
- F04D25/0613—Units comprising pumps and their driving means the pump being electrically driven the electric motor being specially adapted for integration in the pump the electric motor being of the inside-out type, i.e. the rotor is arranged radially outside a central stator
- F04D25/0646—Details of the stator
Definitions
- the present invention relates to a cooling fan, and more particularly relates to a cooling fan with a balancing structure for maintaining stable rotation of a rotor thereof.
- a conventional cooling fan includes a stator and a rotor having a hub with a plurality of fan blades extending therefrom.
- the stator establishes an alternating magnetic field interacting with the magnetic field of the rotor to drive the rotor to rotate.
- rotation of the fan blades generates a forced airflow for cooling the electronic packages, such as the CPUs.
- the stator includes a bearing defining a bearing hole therein.
- the rotor has a shaft extending into the bearing hole and is thus rotatably supported by the bearing.
- the rotating fan blades generate an external pressure which pulls the rotor to move upwardly along the axial direction away from the stator, and the rotor is thus kept in a “floating” condition.
- the floating rotor is inclined to generate a level of noise, which can be unacceptable.
- a cooling fan includes a fan housing having a central tube extending upwardly therefrom, a bearing received in the central tube, a stator mounted around the central tube, and a rotor.
- the rotor includes a hub, a magnet adhered to an inner side of the hub, and a shaft extending from a central portion of the hub into the bearing.
- the stator includes a stator core having a ring-shaped main body and a plurality of claws extending radially and outwardly from the main body, coils being wound on the claws, and a printed circuit board being electrically connected to the coils.
- At least one balancing structure extends from the printed circuit board corresponding to a position between two adjacent claws of the stator core.
- the at least one balancing structure is made of magnetizable material, and exerts a downwardly attractive, magnetic force on the magnet.
- FIG. 1 is an isometric, assembled view of a cooling fan in accordance with a preferred embodiment of the present invention
- FIG. 2 is an exploded view of the cooling fan of FIG. 1 ;
- FIG. 3 is a cross-sectional view of the cooling fan taken along line Ill-Ill of FIG. 1 ;
- FIG. 4 is an enlarged, top view of a stator of the cooling fan of FIG. 1 .
- a cooling fan includes a fan housing 10 , a balancing structure 100 , a pair of bearings 30 , a rotor 20 , and a stator 40 in respective to which the rotor 20 is rotatable.
- the fan housing 10 is square column shaped.
- An inner space (not labeled) is defined in the housing 10 receiving the rotor 20 and the stator 40 therein, and thus forms an air inlet 18 at a top side and an air outlet 16 at a bottom side of the housing 10 .
- a base 12 is arranged in the inner space of the housing 10 at the bottom side thereof.
- a central tube 14 extends upwardly from a central portion of the base 12 .
- the central tube 14 defines a central hole 140 therein.
- An annular recess 142 is respectively formed on an inner circumference of the top and bottom ends of the central tube 14 with an inner diameter larger than that of the central hole 140 of the central tube 14 .
- the two recesses 142 communicate with the central hole 140 .
- the bearings 30 are respectively received in the recesses 142 of the central tube 14 .
- the bearings 30 are ball bearing which includes an annular inner ring, an annular outer ring and a plurality of balls sandwiched between the inner and outer rings.
- An outer diameter of the outer rings of the bearings 30 is substantially the same as the diameter of the recesses 142 of the central tube 14 .
- the bearings 30 are not limited to being ball bearings, other types of bearings, such as sleeve bearings, hydrodynamic bearings may also be adopted.
- the rotor 20 includes a hub 22 forming a shaft seat 220 in a central portion thereof, a plurality of fan blades 26 extending radially from an outer periphery of the hub 22 , a permanent magnet 28 adhered to an inner side of the hub 22 , and a shaft 24 received in the shaft seat 220 and extending downwardly from a central portion of the shaft seat 220 .
- a diameter of the shaft 24 is approximately the same as an inner diameter of the inner rings of the bearings 30 and thus the inner rings of the bearings 30 are fixedly mounted around the shaft 24 and rotate with the shaft 24 .
- An annular notch (not labeled) is defined near a free end 240 of the shaft 24 far from the hub 22 .
- the stator 40 includes a stator core 42 consisting of layered yokes.
- Each yoke includes an annular main body 420 and four claws (not labeled) extending radially and outwardly from the main body 420 .
- the stator core 42 may form more than or less than four claws according to practical needs.
- Each of the claws includes a linear-shaped portion 422 extending radially from the main body 420 and an arc-shaped portion 424 formed at an outer end of the linear-shaped portion 422 .
- the arc-shaped portions 424 of the claws are concentric and are evenly spaced from each other along a circumferential direction thereof.
- a narrow gap 90 is defined between two adjacent arc-shaped portions 424 of the claws.
- Stator coils 44 surround the linear-shaped portions 422 of the claws to establish an alternating magnetic field.
- a PCB 46 printed circuit board
- electronic components mounted thereon is electrically connected with the stator coils 44 to control electrical current flowing through the coils 44 .
- upper and lower insulating frames 48 are used to cover the stator core 42 and electrically insulate the stator coils 44 from the stator core 42 .
- the balancing structure 100 includes four column-shaped poles 102 extending upwardly from the PCB 46 .
- the poles 102 are fixedly connected to the PCB 46 through soldering.
- the poles 102 and the PCB 46 can be assembled by interference fit, and in this situation, a plurality of mounting holes can be defined in the PCB 46 receiving the poles 102 therein.
- the poles 102 are arranged corresponding to the gaps 90 of the stator core 42 . Each pole 102 extends through a corresponding gap 90 , and thus the poles 102 and the arc-shaped portions 424 of the claws are concentric and are arranged in alternating fashion along the circumferential direction thereof.
- each pole 102 is approximately at the same level as that of the stator core 42 .
- the poles 102 are made of magnetizable materials, such as steel, iron, iron alloy, nickel, silicon steel, permalloy or ferrite, and thus can magnetically attract the magnet 28 of the rotor 20 to pull the rotor 20 downwardly along the axial direction.
- the poles 102 are connected to the PCB 46 and thus can absorb the heat generated by the circuitry of the PCB 46 and the electronic components mounted on the PCB 46 . It is to be understood that the poles 102 are used to attract the magnet 28 , and thus the shape, the position, the number are not limited to the preferred embodiment as discussed above.
- the poles 102 can have a cross section being square, triangular, polygonal or irregular.
- a size of the poles 102 should be large, and a distance between the magnet 28 and the poles 102 should be small.
- a height of the poles 102 should not be higher than the stator 40 .
- stator 40 When assembled, the stator 40 is mounted around the central tube 1 4 .
- the two bearings 30 are respectively received in the recesses 1 42 of the central tube 1 4 .
- the shaft 24 of the rotor 20 extends through the top bearing 30 , the central hole 140 of the central tube 14 , and then the bottom bearing 30 into the bottom recess 142 of the central tube 14 .
- the notch (not labeled) near the free end 240 of the shaft 24 is located under the bottom bearing 30 .
- a locking washer 60 is located under the bottom bearing 30 and is engaged in the notch of the shaft 24 , thus limiting movement of the shaft 24 along an axial direction thereof.
- the locking washer 60 defines an inner hole (not labeled) with a diameter smaller than the diameter of the shaft 24 , but larger than the diameter of the portion of the shaft 24 defining the notch.
- a conical-shaped coil spring 50 is arranged between the top bearing 30 and the shaft seat 220 of the hub 22 for providing the top bearing 30 and the hub 22 with a cushion therebetween, thus ensuring that the shaft seat 220 of the hub 22 will not have a severe collision with the top bearing 30 when the cooling fan is activated or transported.
- a bottom end of the spring 50 abutting against the inner ring of the top bearing 30 has a diameter relatively smaller than that of a top end of the spring 50 abutting against the shaft seat 220 .
- the magnet 28 is positioned around the stator 40 and faces towards the stator core 42 .
- the rotor 20 is driven to rotate by the interaction of the alternating magnetic field established by the stator 40 and the magnetic field of the rotor 20 .
- the balancing structure 100 can magnetically attract the magnet 28 of the rotor 20 and pull the rotor 20 downwardly along the axial direction.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Iron Core Of Rotating Electric Machines (AREA)
- Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
- Motor Or Generator Cooling System (AREA)
Abstract
Description
- 1. Field of the Invention
- The present invention relates to a cooling fan, and more particularly relates to a cooling fan with a balancing structure for maintaining stable rotation of a rotor thereof.
- 2. Description of related art
- With the continuing development of the electronic technology, electronic packages such as CPUs (central processing units) are generating more and more heat that requires immediate dissipation. Cooling fans are commonly used in combination with heat sinks for cooling the CPUs.
- A conventional cooling fan includes a stator and a rotor having a hub with a plurality of fan blades extending therefrom. The stator establishes an alternating magnetic field interacting with the magnetic field of the rotor to drive the rotor to rotate. Thus rotation of the fan blades generates a forced airflow for cooling the electronic packages, such as the CPUs. The stator includes a bearing defining a bearing hole therein. The rotor has a shaft extending into the bearing hole and is thus rotatably supported by the bearing. However, during rotation of the rotor, the rotating fan blades generate an external pressure which pulls the rotor to move upwardly along the axial direction away from the stator, and the rotor is thus kept in a “floating” condition. The floating rotor is inclined to generate a level of noise, which can be unacceptable.
- For the foregoing reasons, therefore, there is a need in the art for a cooling fan which overcomes the above-mentioned problems.
- According to a preferred embodiment of the present invention, a cooling fan includes a fan housing having a central tube extending upwardly therefrom, a bearing received in the central tube, a stator mounted around the central tube, and a rotor. The rotor includes a hub, a magnet adhered to an inner side of the hub, and a shaft extending from a central portion of the hub into the bearing. The stator includes a stator core having a ring-shaped main body and a plurality of claws extending radially and outwardly from the main body, coils being wound on the claws, and a printed circuit board being electrically connected to the coils. At least one balancing structure extends from the printed circuit board corresponding to a position between two adjacent claws of the stator core. The at least one balancing structure is made of magnetizable material, and exerts a downwardly attractive, magnetic force on the magnet.
- Other advantages and novel features of the present invention will be drawn from the following detailed description of the preferred embodiments of the present invention with attached drawings, in which:
- Many aspects of the present cooling fan can be better understood with reference to the following drawings. The components in the drawings are not necessarily drawn to scale, the emphasis instead being placed upon clearly illustrating the principles of the present cooling fan. Moreover, in the drawings, like reference numerals designate corresponding parts throughout the several views.
-
FIG. 1 is an isometric, assembled view of a cooling fan in accordance with a preferred embodiment of the present invention; -
FIG. 2 is an exploded view of the cooling fan ofFIG. 1 ; -
FIG. 3 is a cross-sectional view of the cooling fan taken along line Ill-Ill ofFIG. 1 ; and -
FIG. 4 is an enlarged, top view of a stator of the cooling fan ofFIG. 1 . - Referring to
FIGS. 1 through 4 , a cooling fan according to a preferred embodiment includes afan housing 10, abalancing structure 100, a pair ofbearings 30, arotor 20, and astator 40 in respective to which therotor 20 is rotatable. - The
fan housing 10 is square column shaped. An inner space (not labeled) is defined in thehousing 10 receiving therotor 20 and thestator 40 therein, and thus forms anair inlet 18 at a top side and anair outlet 16 at a bottom side of thehousing 10. Abase 12 is arranged in the inner space of thehousing 10 at the bottom side thereof. Acentral tube 14 extends upwardly from a central portion of thebase 12. Thecentral tube 14 defines acentral hole 140 therein. Anannular recess 142 is respectively formed on an inner circumference of the top and bottom ends of thecentral tube 14 with an inner diameter larger than that of thecentral hole 140 of thecentral tube 14. The tworecesses 142 communicate with thecentral hole 140. - The
bearings 30 are respectively received in therecesses 142 of thecentral tube 14. In this embodiment, thebearings 30 are ball bearing which includes an annular inner ring, an annular outer ring and a plurality of balls sandwiched between the inner and outer rings. An outer diameter of the outer rings of thebearings 30 is substantially the same as the diameter of therecesses 142 of thecentral tube 14. It is to be understood that thebearings 30 are not limited to being ball bearings, other types of bearings, such as sleeve bearings, hydrodynamic bearings may also be adopted. - The
rotor 20 includes ahub 22 forming ashaft seat 220 in a central portion thereof, a plurality offan blades 26 extending radially from an outer periphery of thehub 22, apermanent magnet 28 adhered to an inner side of thehub 22, and ashaft 24 received in theshaft seat 220 and extending downwardly from a central portion of theshaft seat 220. A diameter of theshaft 24 is approximately the same as an inner diameter of the inner rings of thebearings 30 and thus the inner rings of thebearings 30 are fixedly mounted around theshaft 24 and rotate with theshaft 24. An annular notch (not labeled) is defined near afree end 240 of theshaft 24 far from thehub 22. - The
stator 40 includes astator core 42 consisting of layered yokes. Each yoke includes an annularmain body 420 and four claws (not labeled) extending radially and outwardly from themain body 420. Alternatively, thestator core 42 may form more than or less than four claws according to practical needs. Each of the claws includes a linear-shaped portion 422 extending radially from themain body 420 and an arc-shaped portion 424 formed at an outer end of the linear-shaped portion 422. The arc-shaped portions 424 of the claws are concentric and are evenly spaced from each other along a circumferential direction thereof. Anarrow gap 90 is defined between two adjacent arc-shaped portions 424 of the claws.Stator coils 44 surround the linear-shaped portions 422 of the claws to establish an alternating magnetic field. A PCB 46 (printed circuit board) with electronic components mounted thereon is electrically connected with thestator coils 44 to control electrical current flowing through thecoils 44. To avoid thecoils 44 from coming into electrical contact with thestator core 42, upper and lowerinsulating frames 48 are used to cover thestator core 42 and electrically insulate thestator coils 44 from thestator core 42. - The
balancing structure 100 includes four column-shaped poles 102 extending upwardly from thePCB 46. In this embodiment, thepoles 102 are fixedly connected to thePCB 46 through soldering. Alternatively, thepoles 102 and thePCB 46 can be assembled by interference fit, and in this situation, a plurality of mounting holes can be defined in thePCB 46 receiving thepoles 102 therein. Thepoles 102 are arranged corresponding to thegaps 90 of thestator core 42. Eachpole 102 extends through acorresponding gap 90, and thus thepoles 102 and the arc-shaped portions 424 of the claws are concentric and are arranged in alternating fashion along the circumferential direction thereof. A top edge of eachpole 102 is approximately at the same level as that of thestator core 42. Thepoles 102 are made of magnetizable materials, such as steel, iron, iron alloy, nickel, silicon steel, permalloy or ferrite, and thus can magnetically attract themagnet 28 of therotor 20 to pull therotor 20 downwardly along the axial direction. In addition, thepoles 102 are connected to thePCB 46 and thus can absorb the heat generated by the circuitry of thePCB 46 and the electronic components mounted on thePCB 46. It is to be understood that thepoles 102 are used to attract themagnet 28, and thus the shape, the position, the number are not limited to the preferred embodiment as discussed above. For example, thepoles 102 can have a cross section being square, triangular, polygonal or irregular. For increasing the magnetic attraction force between themagnet 28 and thepoles 102, a size of thepoles 102 should be large, and a distance between themagnet 28 and thepoles 102 should be small. On the other hand, for avoiding thepoles 102 from scraping thehub 22, a height of thepoles 102 should not be higher than thestator 40. - When assembled, the
stator 40 is mounted around the central tube 1 4. The twobearings 30 are respectively received in the recesses 1 42 of the central tube 1 4. Theshaft 24 of therotor 20 extends through thetop bearing 30, thecentral hole 140 of thecentral tube 14, and then the bottom bearing 30 into thebottom recess 142 of thecentral tube 14. The notch (not labeled) near thefree end 240 of theshaft 24 is located under thebottom bearing 30. A lockingwasher 60 is located under the bottom bearing 30 and is engaged in the notch of theshaft 24, thus limiting movement of theshaft 24 along an axial direction thereof. The lockingwasher 60 defines an inner hole (not labeled) with a diameter smaller than the diameter of theshaft 24, but larger than the diameter of the portion of theshaft 24 defining the notch. A conical-shapedcoil spring 50 is arranged between thetop bearing 30 and theshaft seat 220 of thehub 22 for providing thetop bearing 30 and thehub 22 with a cushion therebetween, thus ensuring that theshaft seat 220 of thehub 22 will not have a severe collision with thetop bearing 30 when the cooling fan is activated or transported. A bottom end of thespring 50 abutting against the inner ring of thetop bearing 30 has a diameter relatively smaller than that of a top end of thespring 50 abutting against theshaft seat 220. Themagnet 28 is positioned around thestator 40 and faces towards thestator core 42. - During operation, the
rotor 20 is driven to rotate by the interaction of the alternating magnetic field established by thestator 40 and the magnetic field of therotor 20. When rotation of therotor 20 generating an external pressure pulls therotor 20 upwardly along the axial direction thereof, the balancingstructure 100 can magnetically attract themagnet 28 of therotor 20 and pull therotor 20 downwardly along the axial direction. Thus the axially upward movement and possible floating of therotor 20 during rotation of the cooling fan is avoided, and thus the problem of the noise generated by the floating of therotor 20 during an unstable period of the floating of therotor 20 can be solved by the present invention. - It is understood that the invention may be embodied in other forms without departing from the spirit thereof. Thus, the present example and embodiment are to be considered in all respects as illustrative and not restrictive, and the invention is not to be limited to the details given herein.
Claims (12)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN200710075534.0 | 2007-08-03 | ||
CNA2007100755340A CN101358603A (en) | 2007-08-03 | 2007-08-03 | Radiator fan |
Publications (1)
Publication Number | Publication Date |
---|---|
US20090035162A1 true US20090035162A1 (en) | 2009-02-05 |
Family
ID=40331161
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/845,740 Abandoned US20090035162A1 (en) | 2007-08-03 | 2007-08-27 | Cooling fan |
Country Status (2)
Country | Link |
---|---|
US (1) | US20090035162A1 (en) |
CN (1) | CN101358603A (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20100028177A1 (en) * | 2008-07-29 | 2010-02-04 | Alex Horng | Miniature Fan |
US20130004304A1 (en) * | 2011-06-30 | 2013-01-03 | Nidec Corporation | Fan |
US10215231B2 (en) * | 2017-06-26 | 2019-02-26 | Asia Vital Components Co., Ltd. | Bearing structure with close fit |
US10576227B2 (en) | 2011-04-18 | 2020-03-03 | Resmed Motor Technologies Inc | PAP system blower |
CN111404305A (en) * | 2019-06-03 | 2020-07-10 | 电子科技大学中山学院 | New energy automobile motor end cover and bearing room structure |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2012163021A (en) * | 2011-02-04 | 2012-08-30 | Nippon Densan Corp | Blower fan |
CN102650299A (en) * | 2012-03-16 | 2012-08-29 | 深圳市锦固鸿五金科技有限公司 | High-temperature-resistance abrasion-resistance nanometer bearing fan |
CN109380793A (en) * | 2017-08-04 | 2019-02-26 | 金士盾科技股份有限公司 | Can space make the air vertical convection device of scape |
CN109654043B (en) * | 2017-10-11 | 2022-02-25 | 台达电子工业股份有限公司 | Fan with cooling device |
CN108917303B (en) * | 2018-09-26 | 2023-02-24 | 珠海格力电器股份有限公司 | Fan subassembly, fan and drying-machine |
CN209344914U (en) * | 2019-03-15 | 2019-09-03 | 宁波生久散热科技有限公司 | It is a kind of for motor or the radiator structure of fan |
US11460036B2 (en) * | 2019-10-07 | 2022-10-04 | Cooler Master Co., Ltd. | Light emitting fan device and non-light emitting fan device |
CN111278264B (en) * | 2020-03-24 | 2022-05-13 | Oppo广东移动通信有限公司 | Heat dissipation assembly of electronic equipment and electronic equipment |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6097120A (en) * | 1999-09-04 | 2000-08-01 | Sunonwealth Electric Machine Industry Co., Ltd. | Brushless D.C. motor assembly |
US6384505B1 (en) * | 2001-08-29 | 2002-05-07 | Sunonwealth Electric Machine Industry | Stator with a radial winding |
US6483209B1 (en) * | 2001-06-15 | 2002-11-19 | Sunonwealth Electric Machine Industry Co., Ltd. | Balance rings for motors |
US20030168923A1 (en) * | 2002-03-08 | 2003-09-11 | Sankyo Seiki Mfg. Co., Ltd. | Motor with magnetic attraction member |
US20060163965A1 (en) * | 2005-01-21 | 2006-07-27 | Delta Electronics, Inc. | Stator structure of motor |
US20060181160A1 (en) * | 2005-02-14 | 2006-08-17 | Dahlia Technology Corp. | Balancing structure for motor |
US7221069B2 (en) * | 2005-06-07 | 2007-05-22 | Sunonwealth Electric Machine Industry Co., Ltd. | Balancing structure for motor rotor |
US7230357B2 (en) * | 2002-11-26 | 2007-06-12 | Ebm- Papst St. Georgen Gmbh & Co. Kg | External rotor motor and method for assembling such a motor |
-
2007
- 2007-08-03 CN CNA2007100755340A patent/CN101358603A/en active Pending
- 2007-08-27 US US11/845,740 patent/US20090035162A1/en not_active Abandoned
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6097120A (en) * | 1999-09-04 | 2000-08-01 | Sunonwealth Electric Machine Industry Co., Ltd. | Brushless D.C. motor assembly |
US6483209B1 (en) * | 2001-06-15 | 2002-11-19 | Sunonwealth Electric Machine Industry Co., Ltd. | Balance rings for motors |
US6384505B1 (en) * | 2001-08-29 | 2002-05-07 | Sunonwealth Electric Machine Industry | Stator with a radial winding |
US20030168923A1 (en) * | 2002-03-08 | 2003-09-11 | Sankyo Seiki Mfg. Co., Ltd. | Motor with magnetic attraction member |
US7230357B2 (en) * | 2002-11-26 | 2007-06-12 | Ebm- Papst St. Georgen Gmbh & Co. Kg | External rotor motor and method for assembling such a motor |
US20060163965A1 (en) * | 2005-01-21 | 2006-07-27 | Delta Electronics, Inc. | Stator structure of motor |
US20060181160A1 (en) * | 2005-02-14 | 2006-08-17 | Dahlia Technology Corp. | Balancing structure for motor |
US7221069B2 (en) * | 2005-06-07 | 2007-05-22 | Sunonwealth Electric Machine Industry Co., Ltd. | Balancing structure for motor rotor |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20100028177A1 (en) * | 2008-07-29 | 2010-02-04 | Alex Horng | Miniature Fan |
US7695256B2 (en) * | 2008-07-29 | 2010-04-13 | Sunonwealth Electric Machine Industry Co., Ltd. | Miniature fan |
US10576227B2 (en) | 2011-04-18 | 2020-03-03 | Resmed Motor Technologies Inc | PAP system blower |
US11428232B2 (en) | 2011-04-18 | 2022-08-30 | Resmed Motor Technologies Inc. | Pap system blower |
US11859622B2 (en) | 2011-04-18 | 2024-01-02 | Resmed Motor Technologies Inc. | PAP system blower |
US20130004304A1 (en) * | 2011-06-30 | 2013-01-03 | Nidec Corporation | Fan |
US8899946B2 (en) * | 2011-06-30 | 2014-12-02 | Nidec Corporation | Fan having a balance correction portion |
US10215231B2 (en) * | 2017-06-26 | 2019-02-26 | Asia Vital Components Co., Ltd. | Bearing structure with close fit |
CN111404305A (en) * | 2019-06-03 | 2020-07-10 | 电子科技大学中山学院 | New energy automobile motor end cover and bearing room structure |
Also Published As
Publication number | Publication date |
---|---|
CN101358603A (en) | 2009-02-04 |
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Owner name: FU ZHUN PRECISION INDUSTRY (SHEN ZHEN) CO., LTD., Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:YAN, JIAN-FENG;ZHANG, YONG-KANG;HUANG, YING-MIN;AND OTHERS;REEL/FRAME:019751/0194 Effective date: 20070821 Owner name: FOXCONN TECHNOLOGY CO., LTD., TAIWAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:YAN, JIAN-FENG;ZHANG, YONG-KANG;HUANG, YING-MIN;AND OTHERS;REEL/FRAME:019751/0194 Effective date: 20070821 |
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