US20020192087A1 - Low power loss heat dissipation fan - Google Patents

Low power loss heat dissipation fan Download PDF

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Publication number
US20020192087A1
US20020192087A1 US09/879,945 US87994501A US2002192087A1 US 20020192087 A1 US20020192087 A1 US 20020192087A1 US 87994501 A US87994501 A US 87994501A US 2002192087 A1 US2002192087 A1 US 2002192087A1
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United States
Prior art keywords
fan
stator
permanent magnet
coil
low
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Granted
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US09/879,945
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US6488483B1 (en
Inventor
Hsin-mao Hsieh
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Individual
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Publication of US6488483B1 publication Critical patent/US6488483B1/en
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    • 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
    • F04D25/064—Details of the rotor

Definitions

  • the present invention relates to a heat dissipation fan, and more particularly to a heat dissipation fan with low power loss.
  • a conventional heat dissipation fan in accordance with the prior art comprises a casing ( 40 ), a stator ( 50 ) and a fan ( 60 ).
  • the combination of the stator ( 40 ) and the fan ( 60 ) constitute a motor with the fan ( 60 ) serving as a rotor for the motor.
  • the casing includes a sleeve ( 54 ) secured in the casing ( 40 ).
  • the stator ( 50 ) is pressed onto the sleeve ( 54 ).
  • the stator ( 50 ) has a coil ( 53 ), two pole disks ( 51 , 52 ) and a circuit board ( 55 ).
  • the coil ( 53 ) has two sides, and the two pole disks ( 51 , 52 ) respectively abut opposite sides of the coil ( 53 ).
  • the circuit board ( 55 ) is securely attached to the stator ( 50 ) and is electrically connected to the coil ( 53 ).
  • the fan ( 60 ) is rotatably mounted in the stator ( 50 ) inside the casing ( 40 ).
  • a permanent magnet ( 63 ) is securely mounted in the fan ( 60 ) to make the fan ( 60 ) the motor rotor.
  • the fan ( 60 ) rotates due to the interaction between the magnetic forces in stator ( 50 ) and the permanent magnet ( 63 ).
  • a low-friction member ( 541 ) like a lubricating bushing or a ball bearing is pressed into the sleeve ( 54 ).
  • a shaft ( 64 ) securely attached to the fan ( 60 ) extends from the fan ( 60 ) and passes through a passage (not numbered) defined axially through the low-friction member ( 541 ).
  • a neck (not numbered) is defined near the free end of the shaft ( 64 ).
  • a locking disk ( 542 ) is mounted in the neck to securely hold the shaft ( 64 ) in the low-friction member ( 541 ).
  • the shaft ( 64 ) will move up and down in the passage in the low-friction member ( 541 ) when the heat dissipation fan is in operation.
  • the axial movement of the shaft ( 64 ) in the passage causes power loss in the fan motor.
  • the present invention provides an improved heat dissipation fan to mitigate or obviate the aforementioned problems.
  • the main objective of the invention is to provide an improved heat dissipation fan that has low power loss.
  • the heat dissipation fan has a casing, a stator and a fan.
  • the combination of the stator and the fan constitutes a motor with the fan serving as a rotor for the motor.
  • the casing includes a sleeve secured in the casing.
  • the stator is pressed onto the sleeve inside the casing.
  • the stator has a coil, two pole disks and a circuit board. The two pole disks respectively abut opposite sides of the coil.
  • a low-friction member is mounted in the sleeve.
  • the fan is rotatably mounted in the stator inside the casing.
  • a permanent magnet is securely mounted in the fan to make the fan the motor rotor.
  • a shaft securely attached to the fan extends from the fan and passes through the low-friction member.
  • the permanent magnet and the coil in the stator have fixed heights. The height of the permanent magnet is smaller than that of the coil.
  • the permanent magnet has a horizontal central line displaced axially from a horizontal central line of the coil of the stator.
  • FIG. 1 is side plan view in partial section of a first embodiment of a heat dissipation fan in accordance with the present invention
  • FIG. 2 is a side plan view in partial section of a second embodiment of a heat dissipation fan in accordance with the present invention
  • FIG. 3 is an operational side plan view in partial section of the heat dissipation fan in FIG. 2;
  • FIG. 4 is a side plan view in partial section of a conventional heat dissipation fan in accordance with the prior art.
  • a heat dissipation fan in accordance with the present invention comprises a casing ( 10 ), a stator ( 20 ) and a fan ( 30 ).
  • the combination of the stator ( 20 ) and the fan ( 30 ) constitute a motor with the fan ( 30 ) serving as a rotor for the motor.
  • the casing ( 10 ) includes a sleeve ( 24 ) securely mounted in the casing ( 10 ).
  • the stator ( 20 ) is pressed onto the sleeve ( 24 ) inside the casing ( 10 ).
  • the stator ( 20 ) comprises a coil ( 23 ), two pole disks ( 21 , 22 ) and a circuit board ( 25 ).
  • the coil ( 23 ) has two sides, and the two pole disks ( 21 , 22 ) respectively abut opposite sides of the coil ( 23 ).
  • the circuit board ( 25 ) is attached to the stator ( 20 ) and is electrically connected to the coil ( 23 ).
  • a low-friction member (not numbered) is securely mounted in the sleeve ( 21 ).
  • the low-friction member can be a lubricating bushing containing lubricant, a bearing or a combination of friction reducing elements.
  • one embodiment of the low-friction member comprises a lubricating bushing ( 242 ), a ball bearing ( 241 ) and multiple gaskets (not numbered) arranged between the busing ( 242 ) and the ball bearing ( 241 ).
  • a passage (not numbered) is defined axially through the low-friction member.
  • the fan ( 30 ) is rotatably mounted in the stator ( 20 ) inside the casing ( 10 ).
  • the fan has a central radial base ( 31 ) with an outer edge (not numbered), and a skirt ( 32 ) is defined around and extends axially from the outer edge of the base ( 31 ).
  • the skirt ( 32 ) has an outer periphery and an inner periphery. Multiple blades (not numbered) are arranged on the outer periphery of the skirt ( 32 ) of the fan ( 40 ).
  • a permanent magnet ( 33 ) is mounted on the inner periphery of the skirt ( 32 ) of the fan ( 30 ) to make the fan the motor rotor.
  • the permanent magnet ( 33 ) has an axial height shorter than that of the coil ( 23 ) of the stator ( 20 ).
  • the permanent magnet ( 33 ) has a horizontal central line displaced axially from a horizontal central line (A) of the coil ( 23 ).
  • the permanent magnet ( 33 ) is secured in the skirt ( 32 ) and near the base ( 31 ).
  • a shaft ( 34 ) securely attached to the fan ( 30 ) extends from the fan ( 30 ) and passes through the passage in the low-friction member mounted in the sleeve ( 24 ).
  • a neck (not numbered) is defined near the free end of the shaft ( 34 ), and a locking disk ( 243 ) with a central hole securely engages the neck of the shaft ( 34 ) to securely hold the shaft ( 34 ) in the passage in the low-friction member.
  • the fan ( 30 ) will move relative to the low-friction member until the base ( 31 ) of the fan ( 30 ) abuts the low-friction member due to the magnetic attraction provided by the coil ( 23 ) on the permanent magnet ( 33 ). Consequently, the horizontal position of the fan ( 30 ) will be held by means of the magnetic attraction provided by the coil ( 23 ) on the permanent magnet ( 33 ).
  • the fan ( 30 ) with the shaft ( 34 ) will not move axially during the operation of the heat dissipation fan even when a gap is defined between the locking disk ( 243 ) and the low-friction member. An axial vibration of the shaft ( 34 ) will not occur, the rotation of the fan ( 30 ) becomes smoother and power will not be lost.
  • the permanent magnet ( 33 ) is mounted in the skirt ( 32 ) away from the base ( 31 ).
  • the fan ( 30 ) will move relative to the low-friction member until the locking disk ( 243 ) abuts the low-friction member due the magnetic attraction provided by the coil ( 23 ) on the permanent magnet ( 33 ).
  • the fan ( 30 ) and the shaft ( 34 ) will not move axially during the operation of the heat dissipation fan even when there is a gap defined between the base ( 31 ) of the fan ( 30 ) and the low-friction member.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
  • Permanent Magnet Type Synchronous Machine (AREA)

Abstract

A heat dissipation fan that has a casing, a stator and a fan. The stator is pressed onto a sleeve secured in the casing. The stator has a coil and two pole disks respectively abutting opposite sides of the coil. A low-friction member is mounted in the sleeve. The fan is rotatably mounted in and around the stator inside the casing. A permanent magnet is mounted in the fan to make the fan a rotor. A shaft securely attached to the fan extends from the fan and passes through the low-friction member. The permanent magnet has an axial height shorter than that of the coil of the stator. The permanent magnet has a horizontal central line axially displaced from a horizontal central line of the coil of the stator. Accordingly, the fan with the shaft will not move axially during the operation of the heat dissipation fan. Power loss will be avoided.

Description

    BACKGROUND OF THE INVENTION
  • 1. Field of the Invention [0001]
  • The present invention relates to a heat dissipation fan, and more particularly to a heat dissipation fan with low power loss. [0002]
  • 2. Description of Related Art [0003]
  • With reference to FIG. 4, a conventional heat dissipation fan in accordance with the prior art comprises a casing ([0004] 40), a stator (50) and a fan (60). The combination of the stator (40) and the fan (60) constitute a motor with the fan (60) serving as a rotor for the motor. The casing includes a sleeve (54) secured in the casing (40). The stator (50) is pressed onto the sleeve (54). The stator (50) has a coil (53), two pole disks (51, 52) and a circuit board (55). The coil (53) has two sides, and the two pole disks (51, 52) respectively abut opposite sides of the coil (53). The circuit board (55) is securely attached to the stator (50) and is electrically connected to the coil (53).
  • The fan ([0005] 60) is rotatably mounted in the stator (50) inside the casing (40). A permanent magnet (63) is securely mounted in the fan (60) to make the fan (60) the motor rotor. The fan (60) rotates due to the interaction between the magnetic forces in stator (50) and the permanent magnet (63). A low-friction member (541) like a lubricating bushing or a ball bearing is pressed into the sleeve (54). A shaft (64) securely attached to the fan (60) extends from the fan (60) and passes through a passage (not numbered) defined axially through the low-friction member (541). A neck (not numbered) is defined near the free end of the shaft (64). A locking disk (542) is mounted in the neck to securely hold the shaft (64) in the low-friction member (541).
  • Because there is a gap defined between the low-friction member ([0006] 541) and the locking disk (542) and another gap defined between the low-friction member (541) and the fan (60), the shaft (64) will move up and down in the passage in the low-friction member (541) when the heat dissipation fan is in operation. The axial movement of the shaft (64) in the passage causes power loss in the fan motor.
  • To overcome the shortcomings, the present invention provides an improved heat dissipation fan to mitigate or obviate the aforementioned problems. [0007]
    • SUMMARY OF THE INVENTION
  • The main objective of the invention is to provide an improved heat dissipation fan that has low power loss. The heat dissipation fan has a casing, a stator and a fan. The combination of the stator and the fan constitutes a motor with the fan serving as a rotor for the motor. The casing includes a sleeve secured in the casing. The stator is pressed onto the sleeve inside the casing. The stator has a coil, two pole disks and a circuit board. The two pole disks respectively abut opposite sides of the coil. A low-friction member is mounted in the sleeve. The fan is rotatably mounted in the stator inside the casing. A permanent magnet is securely mounted in the fan to make the fan the motor rotor. A shaft securely attached to the fan extends from the fan and passes through the low-friction member. The permanent magnet and the coil in the stator have fixed heights. The height of the permanent magnet is smaller than that of the coil. The permanent magnet has a horizontal central line displaced axially from a horizontal central line of the coil of the stator. With such an arrangement, the fan will not move relative to the low-friction member due to the magnetic attraction provided by the coil on the permanent magnet. The fan with the shaft will not move axially during the operation of the heat dissipation fan. Consequently there is no power loss due to axial movement of the shaft in the low-friction member. [0008]
  • Other objects, advantages and novel features of the invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.[0009]
    • BRIEF DESCRIPTION OF THE DRAWINGS
  • FIG. 1 is side plan view in partial section of a first embodiment of a heat dissipation fan in accordance with the present invention; [0010]
  • FIG. 2 is a side plan view in partial section of a second embodiment of a heat dissipation fan in accordance with the present invention; [0011]
  • FIG. 3 is an operational side plan view in partial section of the heat dissipation fan in FIG. 2; and [0012]
  • FIG. 4 is a side plan view in partial section of a conventional heat dissipation fan in accordance with the prior art.[0013]
    • DETAILED DESCRIPTION OF PREFERRED EMBODIMENT
  • With reference to FIG. 1, a heat dissipation fan in accordance with the present invention comprises a casing ([0014] 10), a stator (20) and a fan (30). The combination of the stator (20) and the fan (30) constitute a motor with the fan (30) serving as a rotor for the motor. The casing (10) includes a sleeve (24) securely mounted in the casing (10). The stator (20) is pressed onto the sleeve (24) inside the casing (10). The stator (20) comprises a coil (23), two pole disks (21,22) and a circuit board (25). The coil (23) has two sides, and the two pole disks (21,22) respectively abut opposite sides of the coil (23). The circuit board (25) is attached to the stator (20) and is electrically connected to the coil (23).
  • A low-friction member (not numbered) is securely mounted in the sleeve ([0015] 21). The low-friction member can be a lubricating bushing containing lubricant, a bearing or a combination of friction reducing elements. With reference to FIG. 1, one embodiment of the low-friction member comprises a lubricating bushing (242), a ball bearing (241) and multiple gaskets (not numbered) arranged between the busing (242) and the ball bearing (241). A passage (not numbered) is defined axially through the low-friction member.
  • The fan ([0016] 30) is rotatably mounted in the stator (20) inside the casing (10). The fan has a central radial base (31) with an outer edge (not numbered), and a skirt (32) is defined around and extends axially from the outer edge of the base (31). The skirt (32) has an outer periphery and an inner periphery. Multiple blades (not numbered) are arranged on the outer periphery of the skirt (32) of the fan (40). A permanent magnet (33) is mounted on the inner periphery of the skirt (32) of the fan (30) to make the fan the motor rotor. The permanent magnet (33) has an axial height shorter than that of the coil (23) of the stator (20). The permanent magnet (33) has a horizontal central line displaced axially from a horizontal central line (A) of the coil (23). In practice, the permanent magnet (33) is secured in the skirt (32) and near the base (31).
  • A shaft ([0017] 34) securely attached to the fan (30) extends from the fan (30) and passes through the passage in the low-friction member mounted in the sleeve (24). A neck (not numbered) is defined near the free end of the shaft (34), and a locking disk (243) with a central hole securely engages the neck of the shaft (34) to securely hold the shaft (34) in the passage in the low-friction member.
  • During the operation of the dissipation fan, the fan ([0018] 30) will move relative to the low-friction member until the base (31) of the fan (30) abuts the low-friction member due to the magnetic attraction provided by the coil (23) on the permanent magnet (33). Consequently, the horizontal position of the fan (30) will be held by means of the magnetic attraction provided by the coil (23) on the permanent magnet (33). The fan (30) with the shaft (34) will not move axially during the operation of the heat dissipation fan even when a gap is defined between the locking disk (243) and the low-friction member. An axial vibration of the shaft (34) will not occur, the rotation of the fan (30) becomes smoother and power will not be lost.
  • With reference to FIGS. 2 and 3, in a second embodiment, the permanent magnet ([0019] 33) is mounted in the skirt (32) away from the base (31). When the dissipation fan is switched on, the fan (30) will move relative to the low-friction member until the locking disk (243) abuts the low-friction member due the magnetic attraction provided by the coil (23) on the permanent magnet (33). The fan (30) and the shaft (34) will not move axially during the operation of the heat dissipation fan even when there is a gap defined between the base (31) of the fan (30) and the low-friction member.
  • Even though numerous characteristics and advantages of the present invention have been set forth in the foregoing description, together with details of the structure and function of the invention, the disclosure is illustrative only, and changes may be made in detail, especially in matters of shape, size, and arrangement of parts within the principles of the invention to the full extent indicated by the broad general meaning of the terms in which the appended claims are expressed. [0020]

Claims (5)

What is claimed is:
1. A heat dissipation fan comprising:
a casing;
a sleeve secured in the casing;
a stator pressed onto the sleeve and having a coil with two sides and two pole disks respectively abutting opposite sides of the coil;
a low-friction member mounted in the sleeve and having a passage defined through the low-friction member;
a fan rotatably mounted around the stator inside the casing;
a permanent magnet mounted in the fan to make the fan a rotor;
a shaft securely attached to the fan extending from the fan and passing through the passage in the low-friction member; and
a locking disk securely mounted on a free end of the shaft to lock the shaft in the low-friction member,
wherein the permanent magnet has an axial height shorter than that of the coil of the stator; and
the permanent magnet has a horizontal central line axially displaced from a horizontal central line of the coil of the stator.
2. The dissipation fan as claimed in claim 1, wherein the fan comprises:
a base;
a skirt with an inner and outer periphery defined around the base on which the permanent magnet is securely mounted on the inner periphery; and
multiple blades attached to or formed on an outer periphery of the skirt.
3. The dissipation fan as claimed in claim 2, wherein the permanent magnet is attached to the inner periphery of the skirt near the base.
4. The dissipation fan as claimed in claim 2, wherein the permanent magnet is attached to the inner periphery of the skirt away from the base.
5. The dissipation fan as claimed in claim 1, wherein the low-friction member comprises a lubricating bushing pressed into the sleeve, a ball bearing pressed into the sleeve and multiple gaskets arranged between the bushing and the ball bearing.
US09/879,945 2001-06-14 2001-06-14 Low power loss heat dissipation fan Expired - Fee Related US6488483B1 (en)

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Cited By (6)

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US20050244291A1 (en) * 2004-04-28 2005-11-03 Kentaro Tomioka Pump and electronic apparatus having this pump
US20050265001A1 (en) * 2004-05-31 2005-12-01 Tomonori Saito Cooling system and projection-type image display apparatus using the same
US7301771B2 (en) 2004-04-28 2007-11-27 Kabushiki Kaisha Toshiba Heat-receiving apparatus and electronic equipment
US20070280837A1 (en) * 2006-06-06 2007-12-06 Nidec Sankyo Corporation Vortex pump
US20120087816A1 (en) * 2008-02-29 2012-04-12 Foxconn Technology Co., Ltd. Cooling fan
WO2020231897A1 (en) * 2019-05-10 2020-11-19 Carrier Corporation Compressor with thrust control

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JP2001304199A (en) * 2000-04-19 2001-10-31 Minebea Co Ltd Blower
TW568508U (en) * 2001-03-27 2003-12-21 Delta Electronics Inc Fan with good heat dissipation
US7094039B2 (en) * 2003-05-21 2006-08-22 Act-Rx Technology Corporation Heat-dissipating fan
US20060273677A1 (en) * 2005-06-07 2006-12-07 Sunonwealth Electric Machine Industry Co., Ltd. Rotor for motor
TWI266467B (en) * 2005-12-30 2006-11-11 Sunonwealth Electr Mach Ind Co Pivot-connection structure of motor rotor
TWI275227B (en) * 2006-01-19 2007-03-01 Sunonwealth Electr Mach Ind Co Structure of retention ring for motor
TWI279962B (en) * 2006-02-06 2007-04-21 Sunonwealth Electr Mach Ind Co Structure of motor rotor
US20080008590A1 (en) * 2006-07-06 2008-01-10 Foxconn Technology Co., Ltd. Electric fan with bearing system
TWI381613B (en) * 2008-12-02 2013-01-01 Sunonwealth Electr Mach Ind Co Rotor of a motor
US20120171024A1 (en) * 2011-01-02 2012-07-05 Asia Vital Components Co., Ltd. Bearing holding structure and fan module using same
US20140355917A1 (en) * 2013-05-30 2014-12-04 Kuo-Chen Chang Connection structure for a shaft and a bearing
US10215231B2 (en) * 2017-06-26 2019-02-26 Asia Vital Components Co., Ltd. Bearing structure with close fit

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050244291A1 (en) * 2004-04-28 2005-11-03 Kentaro Tomioka Pump and electronic apparatus having this pump
US7301771B2 (en) 2004-04-28 2007-11-27 Kabushiki Kaisha Toshiba Heat-receiving apparatus and electronic equipment
US7548425B2 (en) 2004-04-28 2009-06-16 Kabushiki Kaisha Toshiba Heat-Receiving apparatus and electronic equipment
US20050265001A1 (en) * 2004-05-31 2005-12-01 Tomonori Saito Cooling system and projection-type image display apparatus using the same
US7275833B2 (en) 2004-05-31 2007-10-02 Kabushiki Kaisha Toshiba Cooling system and projection-type image display apparatus using the same
US20070280837A1 (en) * 2006-06-06 2007-12-06 Nidec Sankyo Corporation Vortex pump
US20120087816A1 (en) * 2008-02-29 2012-04-12 Foxconn Technology Co., Ltd. Cooling fan
US8435018B2 (en) * 2008-02-29 2013-05-07 Fu Zhun Precision Industry (Shen Zhen) Co., Ltd. Cooling fan
WO2020231897A1 (en) * 2019-05-10 2020-11-19 Carrier Corporation Compressor with thrust control

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