US20110229350A1 - Blower - Google Patents

Blower Download PDF

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Publication number
US20110229350A1
US20110229350A1 US13/048,484 US201113048484A US2011229350A1 US 20110229350 A1 US20110229350 A1 US 20110229350A1 US 201113048484 A US201113048484 A US 201113048484A US 2011229350 A1 US2011229350 A1 US 2011229350A1
Authority
US
United States
Prior art keywords
ring magnet
blower
rotor
impeller
motor
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
Application number
US13/048,484
Other languages
English (en)
Inventor
Wan Mei He
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Johnson Electric SA
Original Assignee
Johnson Electric SA
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 Johnson Electric SA filed Critical Johnson Electric SA
Assigned to JOHNSON ELECTRIC S.A. reassignment JOHNSON ELECTRIC S.A. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: HE, WAN MEI
Publication of US20110229350A1 publication Critical patent/US20110229350A1/en
Abandoned legal-status Critical Current

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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
    • 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
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47K—SANITARY EQUIPMENT NOT OTHERWISE PROVIDED FOR; TOILET ACCESSORIES
    • A47K10/00—Body-drying implements; Toilet paper; Holders therefor
    • A47K10/48—Drying by means of hot air
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L9/00—Details or accessories of suction cleaners, e.g. mechanical means for controlling the suction or for effecting pulsating action; Storing devices specially adapted to suction cleaners or parts thereof; Carrying-vehicles specially adapted for suction cleaners
    • A47L9/28—Installation of the electric equipment, e.g. adaptation or attachment to the suction cleaner; Controlling suction cleaners by electric means
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L9/00—Details or accessories of suction cleaners, e.g. mechanical means for controlling the suction or for effecting pulsating action; Storing devices specially adapted to suction cleaners or parts thereof; Carrying-vehicles specially adapted for suction cleaners
    • A47L9/28—Installation of the electric equipment, e.g. adaptation or attachment to the suction cleaner; Controlling suction cleaners by electric means
    • A47L9/2889—Safety or protection devices or systems, e.g. for prevention of motor over-heating or for protection of the user
    • 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
    • H02K1/22—Rotating parts of the magnetic circuit
    • H02K1/27—Rotor cores with permanent magnets
    • H02K1/2706—Inner rotors
    • H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
    • H02K1/2726—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of a single magnet or two or more axially juxtaposed single magnets
    • H02K1/2733—Annular magnets
    • 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
    • H02K7/04—Balancing means

Definitions

  • This invention relates to an electric blower and in particular, to a blower suitable for use in a hand dryer or air cleaner.
  • a known blower includes a motor with a rotor and a stator, an impeller driven by the motor and a housing with an air inlet and an air outlet and in which the motor and the impeller are accommodated.
  • the rotor has a ring magnet made of bonded NdFeB (neodymium iron boron) rare earth and adhered to a rotor core of the rotor.
  • the blower has a disadvantage of low reliability and usability, because the ring magnet may breakdown when the rotor is rotating at high speed, such as over 15000 rpm (revolutions per minute). At this speed the bonded rare earth magnet tends to disintegrate due to the forces on the magnet. Even sintered rare earth magnets become physically unstable at rotational speeds above 40,000 rpm.
  • modern appliances, such as hand dryers and air cleaners are requiring motors with high rotation speeds and light weight.
  • the present invention provides a blower comprising: a motor with a rotor and a stator; an impeller driven by the motor; a diffuser for directing air from the impeller; and a housing accommodating the motor, the impeller and the diffuser and having an air inlet and an air outlet, wherein the rotor comprises: a shaft, a rotor core fixed to the shaft, a ring magnet fixed to the rotor core, and a protective sleeve tightly surrounding the ring magnet.
  • the protective sleeve is made of metal.
  • the protective sleeve is made of stainless steel plate.
  • thickness of the protective sleeve is between 0.1 mm and 0.3 mm.
  • the ring magnet is a bonded NdFeB rare earth ring magnet or a sintered NdFeB rare earth ring magnet.
  • NdFeB rare earth magnets provide a higher magnetic energy in a smaller lighter package and thus can reduce the size and thus weight of the motor.
  • the rotor has a pair of balance rings that press against the axial ends of the ring magnet to prevent axial movement of the ring magnet with respect to the rotor core.
  • the ring magnet has an axial length that is longer than the axial length of the rotor core and each of the balance rings has a boss that locates within the respective axial end of the ring magnet.
  • the ring magnet is keyed to the rotor core by a tongue in groove connection to prevent rotation of the ring magnet about the rotor core.
  • the diffuser is disposed between the impeller and the motor for directing air from the impeller to the motor via a plurality of air passages and wherein the diffuser supports a bearing for the shaft.
  • the rotor is configured to rotate at a speed greater than 25,000 rpm, preferably greater than 40,000 rpm.
  • FIG. 1 shows a blower in accordance with the preferred embodiment of the present invention
  • FIG. 2 is a view of the blower of FIG. 1 , with a housing removed;
  • FIG. 3 is a side view of the blower in FIG. 2 ;
  • FIG. 4 is a view from below of the blower of FIG. 3 , showing an impeller and a diffuser, being parts of the blower;
  • FIG. 5 is a partially exploded view of a rotor of the blower.
  • FIG. 6 is an exploded view of a rotor assembly without a shaft, according to a second embodiment.
  • FIGS. 1 to 4 illustrate a blower 100 in accordance with the preferred embodiment of the present invention.
  • the blower comprises an impeller 200 , a diffuser 300 , a motor 400 and a housing 500 .
  • the housing 500 comprises a first housing member 510 and a second housing member 520 .
  • the first housing member 510 accommodates the impeller 200 and the diffuser 300 and forms a volute for the impeller.
  • a second housing member 520 accommodates the motor 400 .
  • the first housing member 510 comprises a circular side wall 512 and a bottom wall 514 .
  • the second housing member 520 comprises a hollow cylinder 522 with an end plate 524 .
  • a flange 526 extends outwardly and radially from the lower open end of the cylinder 522 adjacent to the first housing member 510 .
  • the flange 526 is fixedly assembled with the side wall 512 of the first housing member 510 , preferably by crimping the side wall 512 to the flange.
  • An air inlet 516 is formed at the center of the bottom wall 514 of the first housing member 510 and air outlets 523 are formed on the hollow cylinder 522 of the second housing member 520 , at the upper, closed end thereof.
  • a boss 525 is formed in the end plate 524 with a hole arranged for holding a bearing 433 .
  • the first housing member 510 is a stamped sheet metal part while the second housing member 520 is an injection molded plastics material part.
  • FIGS. 2 to 4 the blower is shown with the housing removed to show the impeller, diffuser and motor disposed within the housing.
  • the impeller 200 is fixed to and rotates with a shaft 442 of the motor 400 .
  • the impeller 200 comprises a cover 220 , a base 240 and a plurality of curved blades 260 .
  • the cover 220 has an opening 222 formed at center thereof and opposite to the air inlet 516 .
  • the plurality of blades 260 are disposed between the cover and the base, extending in a generally radial manner from the opening and evenly distributed circumferentially to form a plurality of flow passages through which air passing through the opening 222 flows when the impeller is rotating.
  • Each blade 260 has a plurality of tabs 262 on each of the two long edges and holes corresponding to the tabs 262 are formed in the cover 220 and the base 240 .
  • a tab 262 and a corresponding hole constitute a clamp structure.
  • the blades 260 are firmly fixed between the cover 220 and the base 240 by crimping or otherwise deforming the tabs after they have been inserted into the holes to prevent their removal, in a manner generally known in the art.
  • the diffuser 300 is arranged between the impeller 200 and the motor 400 and fixedly mounted to the housing 500 .
  • the diffuser 300 is provided with a circular body 320 which has an outer diameter larger than the impeller 200 and is fitted to an inner surface of the circular side wall 512 of the first housing member 510 .
  • a bearing holder with a through hole is formed at center of the circular body 320 for holding a bearing 445 for the shaft 442 .
  • a plurality of diffusing structures 340 integrally formed with the circular body 320 are evenly arranged at outer periphery of one surface of the circular body 320 facing the impeller 200 .
  • Each diffusing structure 340 and the inner surface of the circular side wall 512 of the first housing member 510 defines a diffusing passage 342 which guide the air flow axially as well as circumferentially.
  • a plurality of air guides 360 integrally formed with the circular body 320 are evenly arranged on one surface of the circular body 320 facing the motor 400 .
  • Air passages 362 are formed between adjacent air guides 360 and guide the air flow from the diffusing passages into the hollow body 522 of the second housing 520 , to be exhausted from through the outlets 523 .
  • the diffuser 300 channels or guides the air flow from the impeller 200 into the hollow body 522 .
  • Pressured air exiting from the impeller 200 flows into the air passages 362 via the diffusing passages 342 and then are guided to the motor 400 by the air passages 362 so as to be expelled from the blower 100 through the air outlets 523 of the second housing member 520 .
  • the motor 400 is a brushless motor with a permanent magnet rotor 440 and a stator 420 surrounding the rotor 440 .
  • the stator 420 is fixed to the second housing member 520 and comprises a stator core 422 and windings (not shown in the figures) wounded on teeth 424 of the stator core 422 .
  • the rotor 440 comprises a shaft 442 , a rotor core 444 fixed to the shaft 442 , and a ring magnet 446 fixed to the rotor core 444 .
  • the shaft 442 is rotatably supported by two bearings 443 and 445 .
  • the ring magnet 446 is a bonded NdFeB rare earth ring magnet to lower the cost of the blower 100 .
  • the ring magnet 446 may be a sintered NdFeB rare earth ring magnet.
  • a pair of balance rings 441 are attached to the shaft at respective axial ends of the ring magnet 446 to clamp the ring magnet 446 in an axial direction.
  • a protective sleeve 448 is applied to the ring magnet 446 and the pair of balancing rings 441 .
  • the protective sleeve 448 is preferably made of stainless steel plate with a thickness of about 0.1 mm-0.3 mm, which will not significantly effect performance of the motor but has good mechanical strength to endure centrifugal and electromagnetic forces to prevent the ring magnet 446 from breaking up when the rotor 440 is rotating at high speed over 25,000 rpm (even over 40,000 rpm).
  • FIG. 6 illustrates an exploded view of a rotor assembly of a second embodiment with the shaft omitted.
  • the rotor assembly shown would be fitted to a rotor shaft such as shaft 442 of FIG. 5 .
  • the rotor assembly comprises a rotor core 444 which has a central hole for being press fitted onto the shaft.
  • a ring magnet 446 is fitted to the rotor core.
  • the ring magnet is coupled to the rotor core by a tongue and groove connection comprising two grooves 451 formed in the inner surface of the ring magnet which receive or mate with two ridges or tongues 450 formed on the outer surface of the rotor core.
  • the locations of the tongues and grooves may be reversed and the number of tongues and grooves may be different.
  • the tongue and groove connection prevents the ring magnet from rotating about the rotor core.
  • the axial length of the rotor core may be less than the axial length of the ring magnet such that a small chamber may be formed at each the end of the magnet once fitted to the rotor core.
  • the balance rings each have a boss 449 which locates within a respective chamber when fitted to the rotor core.
  • the balance rings may be pressed onto the shaft to hold the ring magnet axially with respect to the shaft and the rotor core.
  • the balance rings 441 are fixed to the rotor core with the bosses 449 contacting the rotor core. Fixing may be by any suitable means such as by bolts passing through the rotor core from one balance ring to the other.
  • the protective sleeve 448 which fits over the ring magnet 446 to support the ring magnet against the forces trying to destroy the ring magnet during high speed rotation.
  • the protective sleeve in this embodiment, has the same axial length as the
  • the blower in accordance with the present invention is particularly suitable for air processing apparatus such as hand dryers and air cleaners.
  • the advantages of embodiments of the present invention include that reliability of the blower can be improved because the added protect sleeve can prevent the ring magnet from being broken and cost of the blower is low because a ring magnet made of bonded NdFeB rare earth is adopted.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Power Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
US13/048,484 2010-03-22 2011-03-15 Blower Abandoned US20110229350A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN2010201401730U CN201730841U (zh) 2010-03-22 2010-03-22 风机、使用所述风机的干手器及吸尘器
CN2010201401730 2010-03-22

Publications (1)

Publication Number Publication Date
US20110229350A1 true US20110229350A1 (en) 2011-09-22

Family

ID=43521997

Family Applications (1)

Application Number Title Priority Date Filing Date
US13/048,484 Abandoned US20110229350A1 (en) 2010-03-22 2011-03-15 Blower

Country Status (4)

Country Link
US (1) US20110229350A1 (ja)
JP (1) JP3168007U (ja)
CN (1) CN201730841U (ja)
DE (1) DE202011003752U1 (ja)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014158397A (ja) * 2013-02-18 2014-08-28 Asmo Co Ltd ロータ及びロータの製造方法
US20170296020A1 (en) * 2014-11-20 2017-10-19 Jiangsu Midea Cleaning Appliances Co., Ltd. Dust collector
US10041502B2 (en) 2014-04-29 2018-08-07 Johnson Electric S.A. Air blower
US20190238016A1 (en) * 2016-06-23 2019-08-01 Robert Bosch Gmbh Rotor for an electric machine, electric machine with the rotor and to method for producing the rotor
US20220006368A1 (en) * 2018-07-13 2022-01-06 Minebea Mitsumi Inc. Motor

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103023184A (zh) * 2011-09-20 2013-04-03 德昌电机(深圳)有限公司 高速气流产生装置及其无刷电机
CN103321922B (zh) * 2012-03-22 2016-11-23 德昌电机(深圳)有限公司 风机及具有该风机的真空吸尘器和干手机
CN103780021B (zh) * 2012-10-24 2018-02-16 德昌电机(深圳)有限公司 有刷电机
CN103929029A (zh) * 2014-04-21 2014-07-16 顾善德 一种压缩机
CN105090114A (zh) * 2014-05-07 2015-11-25 德昌电机(深圳)有限公司 扩散器及应用该扩散器的风机
CN104622390A (zh) * 2015-01-29 2015-05-20 苏州克林威尔电器有限公司 一种使用无刷马达的手持式吸尘器
CN106194786B (zh) * 2015-04-30 2020-04-10 德昌电机(深圳)有限公司 风机及包括其的干手器
CN105534377B (zh) * 2016-01-15 2018-01-02 袁海文 一种叶轮涡喷式干身机
US11855521B2 (en) 2021-02-02 2023-12-26 Black & Decker, Inc. Brushless DC motor for a body-grip power tool

Citations (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4742259A (en) * 1987-05-11 1988-05-03 Franklin Electric Co., Inc. Permanent magnet rotor for electric motor
US4969797A (en) * 1989-03-22 1990-11-13 Matsushita Electric Industrial Co., Ltd. Fan motor
US5110266A (en) * 1989-03-01 1992-05-05 Hitachi, Ltd. Electric blower having improved return passage for discharged air flow
US5296769A (en) * 1992-01-24 1994-03-22 Electrolux Corporation Air guide assembly for an electric motor and methods of making
US5363004A (en) * 1992-04-01 1994-11-08 Kabushiki Kaisha Toshiba Rotator element for electric motor
US6141856A (en) * 1996-12-19 2000-11-07 General Electric Company Method of fabricating rotors with retaining cylinders and reduced harmonic field effect losses
US6339274B1 (en) * 1997-10-24 2002-01-15 Empresa Brasileira De Compressores S.A.-Embraco Electric motor rotor with permanent magnets
US6808365B2 (en) * 2002-02-07 2004-10-26 Johnson Electric S.A. Blower motor
US20040217660A1 (en) * 2003-04-24 2004-11-04 Kunitake Matsushite Low-profile stepping motor having coils wound rectangularly
US20050225190A1 (en) * 2004-04-12 2005-10-13 Ichinomiya Denki Co., Ltd. Rotor for brushless motor and brushless motor
US7259486B2 (en) * 2005-04-21 2007-08-21 Nidec Corporation Axial fan
US20070247009A1 (en) * 2006-04-20 2007-10-25 Leslie Hoffman Motor blower unit
US20080014080A1 (en) * 2006-07-12 2008-01-17 Johnson Electric S.A. Blower
US20090189492A1 (en) * 2008-01-28 2009-07-30 Alex Horng Heat Dissipating Fan
WO2010001776A1 (ja) * 2008-06-30 2010-01-07 株式会社 明電舎 永久磁石式回転機の回転子構造

Patent Citations (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4742259A (en) * 1987-05-11 1988-05-03 Franklin Electric Co., Inc. Permanent magnet rotor for electric motor
US5110266A (en) * 1989-03-01 1992-05-05 Hitachi, Ltd. Electric blower having improved return passage for discharged air flow
US4969797A (en) * 1989-03-22 1990-11-13 Matsushita Electric Industrial Co., Ltd. Fan motor
US5296769A (en) * 1992-01-24 1994-03-22 Electrolux Corporation Air guide assembly for an electric motor and methods of making
US5363004A (en) * 1992-04-01 1994-11-08 Kabushiki Kaisha Toshiba Rotator element for electric motor
US6141856A (en) * 1996-12-19 2000-11-07 General Electric Company Method of fabricating rotors with retaining cylinders and reduced harmonic field effect losses
US6339274B1 (en) * 1997-10-24 2002-01-15 Empresa Brasileira De Compressores S.A.-Embraco Electric motor rotor with permanent magnets
US6808365B2 (en) * 2002-02-07 2004-10-26 Johnson Electric S.A. Blower motor
US20040217660A1 (en) * 2003-04-24 2004-11-04 Kunitake Matsushite Low-profile stepping motor having coils wound rectangularly
US20050225190A1 (en) * 2004-04-12 2005-10-13 Ichinomiya Denki Co., Ltd. Rotor for brushless motor and brushless motor
US7259486B2 (en) * 2005-04-21 2007-08-21 Nidec Corporation Axial fan
US20070247009A1 (en) * 2006-04-20 2007-10-25 Leslie Hoffman Motor blower unit
US20080014080A1 (en) * 2006-07-12 2008-01-17 Johnson Electric S.A. Blower
US20090189492A1 (en) * 2008-01-28 2009-07-30 Alex Horng Heat Dissipating Fan
WO2010001776A1 (ja) * 2008-06-30 2010-01-07 株式会社 明電舎 永久磁石式回転機の回転子構造
US20110187219A1 (en) * 2008-06-30 2011-08-04 Takashi Okitsu Rotor structure of permanent magnet type rotary machine

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Geiras, et al., Permanent Magnet Motor Technology, page 444, 2002. *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014158397A (ja) * 2013-02-18 2014-08-28 Asmo Co Ltd ロータ及びロータの製造方法
US10041502B2 (en) 2014-04-29 2018-08-07 Johnson Electric S.A. Air blower
US20170296020A1 (en) * 2014-11-20 2017-10-19 Jiangsu Midea Cleaning Appliances Co., Ltd. Dust collector
US20190238016A1 (en) * 2016-06-23 2019-08-01 Robert Bosch Gmbh Rotor for an electric machine, electric machine with the rotor and to method for producing the rotor
US20220006368A1 (en) * 2018-07-13 2022-01-06 Minebea Mitsumi Inc. Motor

Also Published As

Publication number Publication date
JP3168007U (ja) 2011-05-26
DE202011003752U1 (de) 2012-01-24
CN201730841U (zh) 2011-02-02

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Legal Events

Date Code Title Description
AS Assignment

Owner name: JOHNSON ELECTRIC S.A., SWITZERLAND

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:HE, WAN MEI;REEL/FRAME:025959/0723

Effective date: 20110301

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION