US3558943A - Air cooled rotor for dynamo-electric machine - Google Patents

Air cooled rotor for dynamo-electric machine Download PDF

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Publication number
US3558943A
US3558943A US856307A US3558943DA US3558943A US 3558943 A US3558943 A US 3558943A US 856307 A US856307 A US 856307A US 3558943D A US3558943D A US 3558943DA US 3558943 A US3558943 A US 3558943A
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US
United States
Prior art keywords
air
passageway
core structure
dynamo
electric machine
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.)
Expired - Lifetime
Application number
US856307A
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English (en)
Inventor
Arne Lennart Nilsson
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Electrolux AB
Original Assignee
Electrolux AB
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Filing date
Publication date
Application filed by Electrolux AB filed Critical Electrolux AB
Application granted granted Critical
Publication of US3558943A publication Critical patent/US3558943A/en
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    • 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
    • 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
    • H02K1/32—Rotating parts of the magnetic circuit with channels or ducts for flow of cooling medium

Definitions

  • the discs bear against the end walls of the' core structure and provide radial passageways having their inner ends communicating with the inner ends of the axially extending passageways and their outer open ends serving as air outlets.
  • Flow of air is induced through the axially extending and radial passageways responsive to the pressure differential of air at the inlets of the axially extending passageways and air at the outlets of the radial passageways during rotation of the rotor.
  • the flow of air through the axially extending and radial passageways effects cooling of the dynamo-electric machine.
  • the passageways in the insulating elements are developed in such manner that, when the core structure is rotating, air accelerates during its flow through the passageways with a consequent decrease in potential energy at the air outlets, so that air is discharged by centrifugal force from the air outlets at a higher velocity than the velocity at which air enters the air inlets. This is due to the pressure differential of air at the outlets and at the inlets which induces flow of air through the passageways when the core structure is rotating, such flow of air promoting cooling of the dynamo-electric machine.
  • FIG. 1 is an elevation view of a rotor of a dynamo-electric machine embodying my invention
  • FIG. 2 is a front view of an end plate of the rotor shown in FIG. 1;
  • FIG. 3 is a sideview of the end plate shown in FIG. 2;
  • FIG. 4 is a fragmentary rear perspective view of the end plate shown in FIGS. 2 and 3; I
  • FIG. 5 is an enlarged sectional view taken at line 5-5 of FIG. 4;
  • FIG. 6 is an elevation view of a detail of the rotor shown in FIG. 1;
  • FIG. 7 which is a sectional view taken at line 7-7 of FIG. 1, more or less diagrammatically illustrates the rotor to bring out details more clearly.
  • the core structure 11 comprises a stack of laminations 12 having spaced teeth 14 defining slots 15 arranged to receive a winding 16 having ends 17 which project beyond the opposing end prises a central hollow hub 20 of cylindrical form which is fixed to the shaft 10 and a plate or disc 21 which extends radially outward fromone end of the hub 20 and is normal or perpendicular to the axis of the shaft 10.
  • the discs 21 are similar in appearance to the laminations I2 and are provided with teeth 22 defining slots 23 which are in alignment with the slots 15 ofthe laminations 12.
  • the hubs 20 of the insulating members 19 extend axially inward from regions 24 at the opposing ends of the core structure 11.
  • the inner surfaces of the hubs 20 are formed with spaced axially extending ridges 27 which extend radially inward.
  • the inner extremities of the ridges 27 frictionally grip the shaft 10 to hold the insulating members 19 in position at the ends of the core structure 11.
  • the gaps formed between the ridges 27 at the inner surfaces of the hubs 20 define axially extending passageways 28 through which air is drawn inward from the regions 24 to the flared portions 25 of the hubs 20 during rotation of the core structure 12, as will be explained presently.
  • the air flowing through the passageways 28 changes its direction and flows radially outward through passageways 29 defined by the end walls 11a of the core structure and the teeth 22 of the insulating members 19 which are U-shaped in section and include closed ends 210 forming parts of the radially extending plates or discs 21 and spaced walls 21b extending therefrom toward the end walls 11a of the core structure.
  • the outer extremities of the walls 21b physically contact the end walls 11a of the core structure to provide the radial passageways 29 from which air is discharged at openings 30 at the extreme outer ends of the teeth 22.
  • the interior of the core structure 11 can be cooled by utilizing the insulating elements 19 to promote flow of air from one end wall 11a to the opposing end wall 1 la of the core structure through passageways 31 extending axially of the core structure, as shown in FIG. 7.
  • the core structure 11 comprises a stack of laminations 12. Each lamination is formed with a central opening 12a to provide a core structure having an elongated opening through which the shaft 10 extends and upon which the core structure 11 is mounted.
  • the opening 12a in each lamination I2 is generally of circular form and further includes spaced open recesses 12b. When the core structure 12 is mounted on the shaft 12 the open ends of the recesses 12b are closed by the shaft to provide several elongated passageways 3! extending lengthwise through the core structure.
  • the ends of the passageways 31 of the .core structure 11 formed by the recesses 12b communicate with the passageways in the insulating elements 19 at regions between the inlets 24 and the outlets 30 and preferably at the junctures of the passageways 28 and 29.
  • the flow of air induced in the passageways 28 and 29 of the insulating elements 19 also induces flow of air in the longitudinally extending passageways 31 of the core structure 11 formed by the recesses 12b ofthe laminations 12.
  • a rotatable member comprising a shaft and core structure mounted thereon having opposing end walls transverse to the axis of rotation of said member, an insulating element positioned at least at one end wall of said core structure and rotatable therewith, said insulating element being formed to provide at least one passageway for air having an air inlet and an air outlet, the air inlet being nearer to the axis of rotation of said rotatable member than the air outlet to induce flow of air through said passageway responsive to the pressure differential of air at the inlet and air at the outlet produced during rotation of said rotatable member, the air flowing through said passageway functioning to promote cooling of the dynamo-electric machine, and said insulating element comprising a hollow hub disposed about said shaft and spaced therefrom to provide a first part of said passageway and a plate extending radially from said hub at said one end wall to provide a second part of said passageway.
  • a dynamo-electric machine as set forth in claim 1 in which said hub is provided with spaced axially extending ridges which extend radially inward from the inner surface thereof, the inner extremities of said ridges being in physical contact with said shaft.
  • a dynamo-electric machine as set forth in claim 1 in which said plate and said one end wall of said core structure cooperate to provide the second part of said passageway having its inner end communicating with the first part of said passageway and its outer end open and serving as the outlet.
  • a rotatable member comprising a shaft and core structure mounted thereon having opposing end walls transverse to the axis of rotation of said member, an insulating element positioned at least at one end wall of said core structure and rotatable therewith, said insulating element ,being formed to provide at least one passageway for air having an air inlet and an air outlet, the air inlet being nearer to the axis of rotation of said rotatable member than the air outlet to induce flow of air through said passageway responsive to the pressure differential of air at the inlet and air at the outlet produced during rotation of said rotatable member, the air flowing through said passageway functioning to promote cooling of the dynamo electric machine, and said core structure having an axially extending passageway from said one end wall to the opposing end wall thereof, said last-mentioned passageway at said one end wall of said core structure being in communication with the one passageway provided by said insulating element at a region thereof between the inlet and the outlet.
  • a dynamo-electric machine as set forth in claim 4 in which said core structure is formed with at least one axially extending recess having an open end closed by said shaft to provide said axially extending passageway.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)
  • Motor Or Generator Cooling System (AREA)
US856307A 1968-09-11 1969-09-09 Air cooled rotor for dynamo-electric machine Expired - Lifetime US3558943A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE12190/68A SE311039B (de) 1968-09-11 1968-09-11

Publications (1)

Publication Number Publication Date
US3558943A true US3558943A (en) 1971-01-26

Family

ID=20295308

Family Applications (1)

Application Number Title Priority Date Filing Date
US856307A Expired - Lifetime US3558943A (en) 1968-09-11 1969-09-09 Air cooled rotor for dynamo-electric machine

Country Status (7)

Country Link
US (1) US3558943A (de)
DE (1) DE1939184A1 (de)
DK (1) DK120806B (de)
FR (1) FR2017760A1 (de)
GB (1) GB1246353A (de)
NL (1) NL6912929A (de)
SE (1) SE311039B (de)

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3957230A (en) * 1973-07-30 1976-05-18 Boucher Roland A Remotely controlled electric airplane
DE2704189A1 (de) * 1976-02-05 1977-08-11 Gen Electric Umlenkstruktur am ende eines gasspaltes einer dynamoelektrischen maschine mit gegenstromkuehlung
DE2945194A1 (de) * 1979-11-08 1981-05-21 Siemens AG, 1000 Berlin und 8000 München Hochtourige maschine
US4383191A (en) * 1980-07-25 1983-05-10 Tokyo Shibaura Denki Kabushiki Kaisha Dynamoelectric machine
GB2189944A (en) * 1986-04-21 1987-11-04 Johnson Electric Ind Mfg Cooling fan location in electric motors
US5160864A (en) * 1988-04-01 1992-11-03 Hitachi, Ltd. Oil-cooled alternator
US6087744A (en) * 1997-08-26 2000-07-11 Robert Bosch Gmbh Electrical machine
WO2006034922A1 (de) * 2004-09-30 2006-04-06 Robert Bosch Gmbh Vorrichtungen zur entwärmung von elektrischen maschinen
US7028385B2 (en) 2001-02-06 2006-04-18 General Electric Company Method for improved distribution of cooling air in an electric machine
US20100141062A1 (en) * 2009-11-30 2010-06-10 Remy Technologies, L.L.C. Rotating Directional Coolant Spray for Electric Machine
US20110298317A1 (en) * 2010-06-08 2011-12-08 Bradfield Michael D Electric Machine Cooling System and Method
US20110298318A1 (en) * 2010-06-08 2011-12-08 Bradfield Michael D Gravity Fed Oil Cooling for an Electric Machine
US20110298316A1 (en) * 2010-06-08 2011-12-08 Bradfield Michael D Electric Machine Cooling System and Method
US20130313928A1 (en) * 2012-05-25 2013-11-28 Gary Brown Electric Machine Rotor Cooling Method
US9653967B2 (en) 2013-03-15 2017-05-16 Techtronic Power Tools Technology Limited Cooling arrangement for an electric motor
US9973049B2 (en) 2013-03-15 2018-05-15 Techtronic Industries Co. Ltd. Electric motor

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3037615C2 (de) * 1980-10-04 1983-12-01 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Verfahren zur Festlegung der Wickelköpfe der Feldspulen von elektrischen Maschinen mit ausgeprägten Polen
FR2529027A1 (fr) * 1982-06-16 1983-12-23 Black & Decker Inc Nouvelle structure d'induit de moteur electrique, notamment pour outils electriques portables
GB2446686B (en) 2007-02-16 2009-04-01 Rolls Royce Plc A cooling arrangement for a variable reluctance electric machine
GB2518348A (en) 2013-07-16 2015-03-25 Aim Co Ltd A rotor for an electric motor
GB2517410A (en) * 2013-07-16 2015-02-25 Aim Co Ltd A Stator and a Rotor for an Electric Motor
DE102017128856A1 (de) 2017-12-05 2019-06-06 Metabowerke Gmbh Elektromotor
DE102021102430A1 (de) 2021-02-03 2022-08-04 Bayerische Motoren Werke Aktiengesellschaft Rotor für eine elektrische Maschine eines Antriebsstrangs sowie elektrische Maschine für ein Fahrzeug

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2043655A (en) * 1932-04-30 1936-06-09 Ehrmann Paul Cooling of electric machines

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2043655A (en) * 1932-04-30 1936-06-09 Ehrmann Paul Cooling of electric machines

Cited By (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3957230A (en) * 1973-07-30 1976-05-18 Boucher Roland A Remotely controlled electric airplane
DE2704189A1 (de) * 1976-02-05 1977-08-11 Gen Electric Umlenkstruktur am ende eines gasspaltes einer dynamoelektrischen maschine mit gegenstromkuehlung
DE2945194A1 (de) * 1979-11-08 1981-05-21 Siemens AG, 1000 Berlin und 8000 München Hochtourige maschine
US4383191A (en) * 1980-07-25 1983-05-10 Tokyo Shibaura Denki Kabushiki Kaisha Dynamoelectric machine
GB2189944A (en) * 1986-04-21 1987-11-04 Johnson Electric Ind Mfg Cooling fan location in electric motors
GB2189944B (en) * 1986-04-21 1990-06-06 Johnson Electric Ind Mfg Cooling in electric motors
US5160864A (en) * 1988-04-01 1992-11-03 Hitachi, Ltd. Oil-cooled alternator
US6087744A (en) * 1997-08-26 2000-07-11 Robert Bosch Gmbh Electrical machine
US7028385B2 (en) 2001-02-06 2006-04-18 General Electric Company Method for improved distribution of cooling air in an electric machine
WO2006034922A1 (de) * 2004-09-30 2006-04-06 Robert Bosch Gmbh Vorrichtungen zur entwärmung von elektrischen maschinen
US20100141062A1 (en) * 2009-11-30 2010-06-10 Remy Technologies, L.L.C. Rotating Directional Coolant Spray for Electric Machine
US8450890B2 (en) * 2009-11-30 2013-05-28 Remy Technologies, L.L.C. Rotating directional coolant spray for electric machine
US20110298318A1 (en) * 2010-06-08 2011-12-08 Bradfield Michael D Gravity Fed Oil Cooling for an Electric Machine
US20110298316A1 (en) * 2010-06-08 2011-12-08 Bradfield Michael D Electric Machine Cooling System and Method
US8269383B2 (en) * 2010-06-08 2012-09-18 Remy Technologies, Llc Electric machine cooling system and method
US20110298317A1 (en) * 2010-06-08 2011-12-08 Bradfield Michael D Electric Machine Cooling System and Method
US8456046B2 (en) * 2010-06-08 2013-06-04 Remy Technologies, Llc Gravity fed oil cooling for an electric machine
US8519581B2 (en) * 2010-06-08 2013-08-27 Remy Technologies, Llc Electric machine cooling system and method
US20130313928A1 (en) * 2012-05-25 2013-11-28 Gary Brown Electric Machine Rotor Cooling Method
CN103427522A (zh) * 2012-05-25 2013-12-04 迪尔公司 电机转子冷却方法
US8896167B2 (en) * 2012-05-25 2014-11-25 Deere & Company Electric machine rotor cooling method
CN103427522B (zh) * 2012-05-25 2018-03-16 迪尔公司 电机转子冷却方法
US9653967B2 (en) 2013-03-15 2017-05-16 Techtronic Power Tools Technology Limited Cooling arrangement for an electric motor
US9973049B2 (en) 2013-03-15 2018-05-15 Techtronic Industries Co. Ltd. Electric motor
US10622856B2 (en) 2013-03-15 2020-04-14 Techtronic Power Tools Technology Limited Cooling arrangement for an electric motor

Also Published As

Publication number Publication date
SE311039B (de) 1969-05-27
DE1939184A1 (de) 1970-04-16
NL6912929A (de) 1970-03-13
DK120806B (da) 1971-07-19
GB1246353A (en) 1971-09-15
FR2017760A1 (de) 1970-05-22

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