US20120195776A1 - Fan comprising an electronically commutated drive motor - Google Patents

Fan comprising an electronically commutated drive motor Download PDF

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Publication number
US20120195776A1
US20120195776A1 US13/384,595 US201013384595A US2012195776A1 US 20120195776 A1 US20120195776 A1 US 20120195776A1 US 201013384595 A US201013384595 A US 201013384595A US 2012195776 A1 US2012195776 A1 US 2012195776A1
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US
United States
Prior art keywords
fan
bearing tube
canceled
fan according
bearing
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
US13/384,595
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English (en)
Inventor
Peter Ragg
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.)
Ebm Papst St Georgen GmbH and Co KG
Original Assignee
Ebm Papst St Georgen GmbH and Co KG
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 Ebm Papst St Georgen GmbH and Co KG filed Critical Ebm Papst St Georgen GmbH and Co KG
Assigned to EBM-PAPST ST. GEORGEN GMBH & CO. KG reassignment EBM-PAPST ST. GEORGEN GMBH & CO. KG ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: RAGG, PETER, MR
Publication of US20120195776A1 publication Critical patent/US20120195776A1/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
    • 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
    • F04D25/08—Units comprising pumps and their driving means the working fluid being air, e.g. for ventilation
    • F04D25/082—Units comprising pumps and their driving means the working fluid being air, e.g. for ventilation the unit having provision for cooling the motor
    • 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
    • F04D29/58—Cooling; Heating; Diminishing heat transfer
    • F04D29/5806—Cooling the drive system
    • 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
    • F04D29/58—Cooling; Heating; Diminishing heat transfer
    • F04D29/582—Cooling; Heating; Diminishing heat transfer specially adapted for elastic fluid pumps
    • F04D29/584—Cooling; Heating; Diminishing heat transfer specially adapted for elastic fluid pumps cooling or heating the machine
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/16—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields
    • H02K5/173—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields using bearings with rolling contact, e.g. ball bearings
    • H02K5/1735—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields using bearings with rolling contact, e.g. ball bearings radially supporting the rotary shaft at only one end of the rotor
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/20—Casings or enclosures characterised by the shape, form or construction thereof with channels or ducts for flow of cooling medium
    • H02K5/207—Casings or enclosures characterised by the shape, form or construction thereof with channels or ducts for flow of cooling medium with openings in the casing specially adapted for ambient air
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K9/00—Arrangements for cooling or ventilating
    • H02K9/02—Arrangements for cooling or ventilating by ambient air flowing through the machine
    • H02K9/04—Arrangements for cooling or ventilating by ambient air flowing through the machine having means for generating a flow of cooling medium
    • H02K9/06—Arrangements for cooling or ventilating by ambient air flowing through the machine having means for generating a flow of cooling medium with fans or impellers driven by the machine shaft
    • 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
    • F04D29/056—Bearings

Definitions

  • the invention relates to a fan having an electronically commutated drive motor.
  • Such fans are used principally as so-called “equipment fans” for cooling electronic devices, for example for cooling computers, servers, circuit boards, etc.
  • Such fans must be extremely inexpensive, but, on the other hand, are expected to be highly reliable and to have a service life at least as long as the service life of the device cooled by the fan.
  • Such fans contain a variety of elements, for example Hall sensors, ICs, transistors, capacitors, etc., as well as bearings, for example plain bearings, rolling bearings, etc.
  • performance-determining element That element which is most greatly jeopardized by high operating temperatures is referred to as the “performance-determining element.” Depending on the construction of the fan, this can therefore be an electronic or a mechanical element.
  • a fan having an internal stator, an external rotor coupled to a central shaft, rotatably journaled inside a bearing tube containing a plurality of bearings, wherein, to facilitate cooling and avoid “hot spots,” the cylindrical wall of bearing tube is formed with a plurality of conduits through which a coolant, for example air, can pass, thereby dissipating heat.
  • the conduits are longitudinal and mutually parallel.
  • Coolant i.e. generally air
  • Coolant can flow through the conduits, provided in the wall of the bearing tube between the internal stator and the bearing elements, so that the waste heat created in the lamination stack cannot be transferred directly to the bearing elements in the bearing tube. This is the case, in particular, for the bearing element adjacent the rotor shaft base, the temperature of which bearing element is lowered by the coolant, so that the temperature at this sensitive location can be reduced, thereby correspondingly extending the service life of the bearing element there, and thus the service life of the fan as a whole.
  • a bearing tube of this kind can be implemented to be very light and very economical of material, but still sufficiently rigid and functionally suitable, for example in terms of cooling at critical locations.
  • FIG. 1 is a perspective depiction of the housing of an axial fan prior to installation of the drive motor and the fan wheel, the bearing tube being visible at the center;
  • FIG. 2 is a depiction analogous to FIG. 1 , from a slightly different angle of view and at greatly enlarged scale;
  • FIG. 3 is a depiction viewed from the underside of the depiction of FIG. 2 , i.e. in the direction of arrow III of FIG. 1 ;
  • FIG. 4 depicts a rotor on which a fan wheel is arranged
  • FIG. 5 is a perspective depiction of housing, drive motor, and fan wheel, viewed approximately in the direction of arrow III of FIG. 1 ;
  • FIG. 6 is a perspective depiction of housing, drive motor, and fan wheel, viewed from a perspective similar to that of FIG. 1 ;
  • FIG. 7 is a longitudinal section through the assembled fan, similar to the depiction of FIG. 5 ;
  • FIG. 8 depicts measurement curves; this figure shows the measurements for a fan not having conduits in the bearing tube and for use of a standard rotor not having a radial fan wheel;
  • FIG. 9 is a depiction analogous to FIG. 8 for a fan of the same size as in FIG. 8 but having a radial fan wheel in the rotor and having conduits in the bearing tube, although here they are closed off so that air cannot flow through them;
  • FIG. 10 is a depiction analogous to FIGS. 8 and 9 for a fan of the same size as in those figures, but having a radial fan wheel in the rotor and having conduits in the wall of the bearing tube which are open, so that air can flow through them during operation, as indicated schematically in FIG. 7 .
  • FIG. 1 shows housing 20 of a typical equipment fan 22 that is depicted in the assembled state in FIG. 6 .
  • Fan 22 here has a fan wheel 24 having seven fan blades 26 , which are mounted on the central rotor 28 of a drive motor 27 and, in FIG. 6 , rotate in the direction of an arrow 30 , i.e. counter-clockwise, so that in FIG. 6 air is transported through fan 22 in the direction of an arrow 34 , i.e. from top to bottom.
  • the result is to produce a corresponding pressure difference at fan 22 , i.e. in FIG. 6 the pressure is greater at the bottom than at the top.
  • Flow-through direction 34 of the transported air is also schematically depicted in FIG. 7 for the right half of that Figure.
  • Fan wheel 24 is depicted in FIG. 4 from the lower (in FIG. 6 ) side.
  • Rotor 28 has on its outer side a pot- or bell-shaped housing 29 that is made of plastic and is integral with blades 26 , as clearly shown in FIG. 5 .
  • a magnetic yoke 40 whose shape is best gathered from FIG. 7 , is mounted in housing 29 by molding.
  • the upper (in FIG. 4 ) end 44 of a rotor shaft 46 is cast, by means of a suitable metal alloy 42 (e.g. ZAMAK) in a collar 41 in the center of yoke 40 .
  • a suitable metal alloy 42 e.g. ZAMAK
  • a small radial fan wheel 48 that keeps air moving there during operation and that improves cooling, particularly in the region of the winding ends. In some cases, such a fan wheel is not necessary, this being ascertained by experiment.
  • Upper end 44 of shaft 46 has an annular groove 45 into which metal alloy 42 engages (see FIG. 7 ).
  • a multi-pole, radially magnetized ring magnet 47 is mounted in yoke 40 .
  • Shaft 46 is journaled in two bearings 52 , 54 , in this case in ball bearings, whose inner rings are slid onto shaft 46 .
  • the inner ring of the lower (in FIG. 7 ) bearing 54 is additionally retained by a snap ring 56 .
  • the outer ring of upper bearing 52 is pressed from above into an opening 60 of a bearing tube 62 as far as a stop 64
  • the outer ring of lower bearing 54 is likewise pressed from below into an opening 66 of bearing tube 62 to the same stop 64 .
  • the latter holds the two outer rings at a predefined spacing.
  • Bearing tube 62 has a wall 59 , whose inner surface is designated 61 and whose outer surface is designated 63 . It is manufactured from a suitable plastic that has the requisite mechanical stability and heat resistance. It is, in this case, integral with a flange 70 whose function is to support internal stator 72 of drive motor 27 and the associated circuit board 76 for the motor electronics. This flange 70 is held by spokes 78 in outer ring 80 of housing 20 .
  • Internal stator 72 has a lamination stack 84 equipped with a stator winding 82 (see FIG. 7 ), which stack is pressed onto ribs 81 on the outer side 63 of bearing tube 62 as far as a stop 86 ( FIG. 2 ) so that waste heat from lamination stack 84 is transferred to wall 59 of bearing tube 62 and, via the latter, in particular to upper bearing 52 ( FIG. 7 ).
  • Wall 59 of bearing tube 62 is equipped with, for example, ten continuous conduits 90 ( FIG. 2 ) whose angular extent alpha can be equal to, for example 25°. Extending between them are radial ribs 92 having an angular extent of, for example, 11°, i.e. the angular extent of conduits 90 is approximately 1.5 to three times the angular extent of ribs 92 . Ribs 81 are located radially outside conduits 90 .
  • conduits 90 extend through flange 70 so that cooling air can flow, in FIG. 7 , from the discharge (lower) side of fan 22 upward through conduits 90 , as indicated by arrows 94 schematically and only for the right side of FIG. 7 .
  • This air 94 cools wall 59 of bearing tube 62 and transports, upward in FIG. 7 , the heat that travels from lamination stack 84 into bearing tube 62 .
  • Bearing tube 62 thus has a honeycomb structure in cross section, making it possible to lengthen the service life of the fan without additional outlay.
  • Radial fan wheel 48 (if present) causes a distribution of the circulating air in the upper (in FIG. 7 ) part of internal stator 72 , and thereby produces uniform cooling.
  • FIG. 8 shows measurement curves for a standard fan in which a radial fan wheel is not provided in rotor 28 , and in which a solid bearing tube, not having a honeycomb structure, is used.
  • the symbol P designates the electrical power level, plotted on the right-hand scale in FIG. 8 .
  • the measured room temperature is labeled 102 , and in this case is equal to 24° C.
  • Curve 104 is the temperature difference of stator winding 82 ( FIG. 7 ) relative to room temperature 102 , i.e. for a volumetric flow rate of zero, this temperature difference is equal to 38° K, and at 380 m 3 /h, it decreases to 22° K.
  • Curve 106 is the temperature difference of upper ball bearing 52
  • 108 is the temperature of lower ball bearing 54 , both relative to room temperature. It is evident that the upper (in FIG. 7 ) ball bearing 52 is hotter than lower ball bearing 54 because the upper ball bearing is being cooled less effectively.
  • FIG. 9 shows measurement curves for a bearing tube 62 that has a honeycomb structure, but in which conduits 90 are closed off.
  • P designates the electrical power level, the curve for which is similar to that in FIG. 8 and is likewise plotted on the right-hand scale in FIG. 9 .
  • Room temperature is labeled 112 and in this case is equal to 23° C.
  • Curve 114 is the temperature difference of stator winding 82 with respect to room temperature.
  • Curve 116 is the temperature difference of upper ball bearing 52 with respect to room temperature.
  • Curve 118 shows the temperature difference of lower ball bearing 54 with respect to room temperature. It is evident that upper ball bearing 52 is approximately 5° K hotter than lower ball bearing 54 .
  • FIG. 10 shows measurement curves for a bearing tube 62 having a honeycomb structure as depicted in FIG. 2 , conduits 90 being open, so that air flows through conduits 90 and through motor 27 as indicated schematically in FIG. 7 by flow arrows 94 , 96 , 98 .
  • Radial fan wheel 48 ( FIG. 4 ) is also provided. Once again, P designates the electrical power level.
  • FIGS. 9 and 10 shows the considerable difference.
  • Room temperature is labeled 122 in FIG. 10 , and is equal here to 23° C.
  • winding temperature The difference between the winding temperature and room temperature is labeled 124 , and is somewhat lower than in FIG. 9 because winding 82 is being cooled better.
  • the temperature difference between upper ball bearing 52 and room temperature is labeled 126 , and is 10° K lower here than in FIG. 9 , i.e. upper ball bearing 52 is being cooled substantially better in FIG. 10 than in FIG. 9 .
  • the temperature difference between lower ball bearing 54 and room temperature 122 is labeled 128 . That difference is approximately 7° K less than in FIG. 9 , i.e. bearing 54 is also being cooled substantially better, so that what results as a whole, from the measures and features according to FIGS. 1 to 7 , is a substantially longer service life for fan 22 , without the need for additional costs for that purpose.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Motor Or Generator Cooling System (AREA)
  • Motor Or Generator Frames (AREA)
US13/384,595 2009-07-18 2010-07-01 Fan comprising an electronically commutated drive motor Abandoned US20120195776A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE202009009840.0 2009-07-18
DE202009009840 2009-07-18
PCT/EP2010/003970 WO2011009525A2 (de) 2009-07-18 2010-07-01 Lüfter mit einem elektronisch kommutierten antriebsmotor

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US20120195776A1 true US20120195776A1 (en) 2012-08-02

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Application Number Title Priority Date Filing Date
US13/384,595 Abandoned US20120195776A1 (en) 2009-07-18 2010-07-01 Fan comprising an electronically commutated drive motor

Country Status (5)

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US (1) US20120195776A1 (zh)
EP (1) EP2457308B1 (zh)
CN (1) CN102474153B (zh)
DE (1) DE202010010272U1 (zh)
WO (1) WO2011009525A2 (zh)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20140286786A1 (en) * 2012-01-12 2014-09-25 Ebm-Papst St. Georgen Gmbh & Co. Kg Axial or diagonal fan with trip edge on the rotor blade
US10006470B2 (en) 2012-10-12 2018-06-26 Ebm-Papst St. Georgen Fastening device for fastening a ventilation array to a seat
CN109713813A (zh) * 2019-02-02 2019-05-03 沈阳工大电机有限公司 一种新型双外冷外转子永磁同步电机
CN113824249A (zh) * 2021-09-03 2021-12-21 珠海格力电器股份有限公司 一种电机

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013112922A1 (de) * 2013-11-22 2015-05-28 Ebm-Papst St. Georgen Gmbh & Co. Kg Diagonal- oder Axiallüfter
CN205123443U (zh) * 2015-09-29 2016-03-30 佛山市启正电气有限公司 一种可直接安装扇叶的吊扇电机
CN205602145U (zh) * 2016-01-19 2016-09-28 深圳市大疆创新科技有限公司 电机、动力装置及使用该动力装置的无人飞行器
CN106451917B (zh) * 2016-11-30 2023-04-21 北京三一智能电机有限公司 发电机和风力发电设备
DE102019107706A1 (de) * 2019-03-26 2020-10-01 Ebm-Papst St. Georgen Gmbh & Co. Kg Lüftergehäuse mit integrierter Motorelektronik

Citations (12)

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US2439127A (en) * 1946-02-25 1948-04-06 Carnegie Illinois Steel Corp Shaft and bearing cooling means
US5821654A (en) * 1994-08-23 1998-10-13 Samsung Electro-Mechanics Co., Ltd. Bearing support for cylindrical rotating shaft bearing
US6384494B1 (en) * 1999-05-07 2002-05-07 Gate S.P.A. Motor-driven fan, particularly for a motor vehicle heat exchanger
US20030210992A1 (en) * 2002-05-07 2003-11-13 Wen-Shi Huang Heat-dissipating device
US6700257B2 (en) * 2001-08-31 2004-03-02 Asia Vital Components Co., Ltd. Bearing fixed assembly in a direct current fan
US20060147322A1 (en) * 2005-01-04 2006-07-06 Asia Vital Component Co., Ltd. Heat dissipating device in a fan
US7300262B2 (en) * 2004-07-16 2007-11-27 Hon Hai Precision Industry Co., Ltd. Heat dissipation fan
US20080218018A1 (en) * 2007-03-09 2008-09-11 Foxconn Technology Co., Ltd. Cooling fan and method of fabrication
US20090009962A1 (en) * 2005-10-11 2009-01-08 Vinson Wade D Computer system with motor cooler
US20090142203A1 (en) * 2005-10-14 2009-06-04 Pietro De Filippis Cooling Fan for a Motor Vehicle
US20090202342A1 (en) * 2008-02-08 2009-08-13 Peter Ragg Fan unit having a fan
US20100124510A1 (en) * 2008-11-18 2010-05-20 Shuo-Hsiu Hsu Fan, motor and bushing thereof

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE20001236U1 (de) * 2000-01-25 2000-04-27 Hsieh Hsin Mao Ventilator
US6318976B1 (en) * 2000-04-10 2001-11-20 Hsieh Hsin-Mao Heat dissipation fan
US7201562B2 (en) * 2004-11-03 2007-04-10 Asia Vital Component Co., Ltd. Fan with central intake
TWI279063B (en) * 2005-06-10 2007-04-11 Delta Electronics Inc Fan and rotor thereof
JP4291846B2 (ja) * 2006-11-24 2009-07-08 アスモ株式会社 ファンモータ

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2439127A (en) * 1946-02-25 1948-04-06 Carnegie Illinois Steel Corp Shaft and bearing cooling means
US5821654A (en) * 1994-08-23 1998-10-13 Samsung Electro-Mechanics Co., Ltd. Bearing support for cylindrical rotating shaft bearing
US6384494B1 (en) * 1999-05-07 2002-05-07 Gate S.P.A. Motor-driven fan, particularly for a motor vehicle heat exchanger
US6700257B2 (en) * 2001-08-31 2004-03-02 Asia Vital Components Co., Ltd. Bearing fixed assembly in a direct current fan
US20030210992A1 (en) * 2002-05-07 2003-11-13 Wen-Shi Huang Heat-dissipating device
US7300262B2 (en) * 2004-07-16 2007-11-27 Hon Hai Precision Industry Co., Ltd. Heat dissipation fan
US20060147322A1 (en) * 2005-01-04 2006-07-06 Asia Vital Component Co., Ltd. Heat dissipating device in a fan
US20090009962A1 (en) * 2005-10-11 2009-01-08 Vinson Wade D Computer system with motor cooler
US20090142203A1 (en) * 2005-10-14 2009-06-04 Pietro De Filippis Cooling Fan for a Motor Vehicle
US20080218018A1 (en) * 2007-03-09 2008-09-11 Foxconn Technology Co., Ltd. Cooling fan and method of fabrication
US20090202342A1 (en) * 2008-02-08 2009-08-13 Peter Ragg Fan unit having a fan
US20100124510A1 (en) * 2008-11-18 2010-05-20 Shuo-Hsiu Hsu Fan, motor and bushing thereof

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20140286786A1 (en) * 2012-01-12 2014-09-25 Ebm-Papst St. Georgen Gmbh & Co. Kg Axial or diagonal fan with trip edge on the rotor blade
US9803649B2 (en) * 2012-01-12 2017-10-31 Ebm-Papst St. Georgen Gmbh & Co. Kg Axial or diagonal fan with trip edge on the rotor blade
US10006470B2 (en) 2012-10-12 2018-06-26 Ebm-Papst St. Georgen Fastening device for fastening a ventilation array to a seat
CN109713813A (zh) * 2019-02-02 2019-05-03 沈阳工大电机有限公司 一种新型双外冷外转子永磁同步电机
CN113824249A (zh) * 2021-09-03 2021-12-21 珠海格力电器股份有限公司 一种电机

Also Published As

Publication number Publication date
EP2457308B1 (de) 2014-04-30
CN102474153A (zh) 2012-05-23
DE202010010272U1 (de) 2010-12-02
WO2011009525A2 (de) 2011-01-27
EP2457308A2 (de) 2012-05-30
WO2011009525A3 (de) 2011-07-07
CN102474153B (zh) 2014-06-11

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Owner name: EBM-PAPST ST. GEORGEN GMBH & CO. KG, GERMANY

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:RAGG, PETER, MR;REEL/FRAME:027547/0855

Effective date: 20111006

STCB Information on status: application discontinuation

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