WO2001008285A1 - Air-cooled electrical machine with axial inclined cooling ducts - Google Patents

Air-cooled electrical machine with axial inclined cooling ducts Download PDF

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Publication number
WO2001008285A1
WO2001008285A1 PCT/HR2000/000027 HR0000027W WO0108285A1 WO 2001008285 A1 WO2001008285 A1 WO 2001008285A1 HR 0000027 W HR0000027 W HR 0000027W WO 0108285 A1 WO0108285 A1 WO 0108285A1
Authority
WO
WIPO (PCT)
Prior art keywords
cooling ducts
air
air cooling
magnetic core
axial inclined
Prior art date
Application number
PCT/HR2000/000027
Other languages
French (fr)
Inventor
Radivoj Belobrajić
Original Assignee
Belobrajic Radivoj
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 Belobrajic Radivoj filed Critical Belobrajic Radivoj
Priority to AU58344/00A priority Critical patent/AU5834400A/en
Publication of WO2001008285A1 publication Critical patent/WO2001008285A1/en

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Classifications

    • 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
    • H02K1/12—Stationary parts of the magnetic circuit
    • H02K1/20—Stationary parts of the magnetic circuit with channels or ducts for flow of cooling medium
    • 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

  • This invention refers to design of air cooling of electrical rotational machines magnetic core.
  • Magnetic core of electrical rotational machines is exposed to alternating magnetic field. It produces Joule losses, which heats the core. Because of that the magnetic core is designed with air cooling ducts.
  • Ordinary magnetic core of electrical rotational machines is designed that core sheets are divided in number segments (in axial direction) which are separated by air cooling ducts. Usual width of air ducts is 0.5 to 1 cm. It makes magnetic core is longer in axial way for air cooling ducts width and accordingly the length of rotor poles. In the same time air ducts increase leakage and disparate of magnetic field. All that results in increasing of material waste and energy losses.
  • the aim of the invention is design of compact magnetic core of air-cooled electrical rotational machines and reducing the losses.
  • Magnetic core of electrical rotational machines with axial inclined air cooling ducts is designed so that air ducts are formed by adequate shapes of magnetic core sheets.
  • the sheets are of such shape that combined one to another and drawn tight they form axial inclined air cooling ducts.
  • the ducts against axis view, form number of holes in magnetic core.
  • the cross-section and longitudinal-section of air ducts can be designed to reach the best effects in heat transfer and so reduce ventilation losses.
  • the ducts pass close to winding so increasing heat transfer from coils and it means that design with higher current load can be used
  • FIG 1 schematic used air-cooling system of electrical rotational machines
  • FIG. 1 cross-section of one magnetic core segment with used air-cooling
  • FIG. 3 cross-section of one magnetic core segment (through air cooling ducts) with axial inclined air cooling ducts

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)
  • Motor Or Generator Cooling System (AREA)

Abstract

Magnetic core (8) of air cooled rotational electric machines with axial inclined air cooling ducts (7) designed so that air cooling ducts are formed by adequate shapes of magnetic core sheets, which combined one to another and drawn tight form axial inclined air cooling ducts.

Description

AIR-COOLED ELECTRICAL MACHINE WITH AXIAL INCLINED COOLING DUCTS
Technical Field
This invention refers to design of air cooling of electrical rotational machines magnetic core.
Magnetic core of electrical rotational machines is exposed to alternating magnetic field. It produces Joule losses, which heats the core. Because of that the magnetic core is designed with air cooling ducts.
Background art
Ordinary magnetic core of electrical rotational machines is designed that core sheets are divided in number segments (in axial direction) which are separated by air cooling ducts. Usual width of air ducts is 0.5 to 1 cm. It makes magnetic core is longer in axial way for air cooling ducts width and accordingly the length of rotor poles. In the same time air ducts increase leakage and disparate of magnetic field. All that results in increasing of material waste and energy losses.
Disclosure of invention
The aim of the invention is design of compact magnetic core of air-cooled electrical rotational machines and reducing the losses.
Magnetic core of electrical rotational machines with axial inclined air cooling ducts is designed so that air ducts are formed by adequate shapes of magnetic core sheets. The sheets are of such shape that combined one to another and drawn tight they form axial inclined air cooling ducts.
The ducts, against axis view, form number of holes in magnetic core. As shape of sheets can be at will, the cross-section and longitudinal-section of air ducts can be designed to reach the best effects in heat transfer and so reduce ventilation losses. The ducts pass close to winding so increasing heat transfer from coils and it means that design with higher current load can be used
Air cooling ducts in teeth increase magnetic field and losses but this increasing is much lower than decreasing of losses over all. Drawings
Figure 1 schematic used air-cooling system of electrical rotational machines
Figure 2 cross-section of one magnetic core segment with used air-cooling
Figure 3 cross-section of one magnetic core segment (through air cooling ducts) with axial inclined air cooling ducts Figure 4 detail of cross-section form figure 3
List of drawing designations:
1. Machine axis
2. pole core on rotor
3. Stator windings
4. Segment of stator magnetic core
5. Stator air cooling ducts
6. Cooling air flow direction
7. Axial inclined air cooling ducts
8. Stator magnetic core

Claims

Claims
1. Magnetic core of air cooled rotational electric machines designated so that air cooling ducts are axial inclined
2. Axial inclined air cooling ducts from claim 1 designated so that they are formed by adequate shapes of magnetic core sheets, which combined one to another and drawn tight form axial inclined air cooling ducts. Cross-section and longitudinal- section of the ducts depends of sheet shape so they can be design at will to reach the best effects.
PCT/HR2000/000027 1999-07-26 2000-07-11 Air-cooled electrical machine with axial inclined cooling ducts WO2001008285A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU58344/00A AU5834400A (en) 1999-07-26 2000-07-11 Air-cooled electrical machine with axial inclined cooling ducts

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
HRP990235A 1999-07-26
HR990235A HRP990235A2 (en) 1999-07-26 1999-07-26 Magnetic stator core of air cooled rotary electric machines with radial, axially slanting cooling channels

Publications (1)

Publication Number Publication Date
WO2001008285A1 true WO2001008285A1 (en) 2001-02-01

Family

ID=10946959

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/HR2000/000027 WO2001008285A1 (en) 1999-07-26 2000-07-11 Air-cooled electrical machine with axial inclined cooling ducts

Country Status (3)

Country Link
AU (1) AU5834400A (en)
HR (1) HRP990235A2 (en)
WO (1) WO2001008285A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20110221286A1 (en) * 2010-03-12 2011-09-15 Nippon Soken, Inc. Electric rotating machine
US10468741B2 (en) 2013-09-15 2019-11-05 Elta Systems Ltd. Phased array antenna assembly

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2986664A (en) * 1959-11-23 1961-05-30 Gen Electric Diagonal flow direct-cooled dynamoelectric machine rotor
US3660702A (en) * 1970-05-11 1972-05-02 Hitachi Ltd Direct-cooled rotor for rotary electric machines
DE3334501A1 (en) * 1982-09-25 1984-03-29 Fuji Electric Co., Ltd., Kawasaki, Kanagawa Method for producing laminated iron cores for electrical machines and apparatuses, and an arrangement of a laminated iron core produced according to said method

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2986664A (en) * 1959-11-23 1961-05-30 Gen Electric Diagonal flow direct-cooled dynamoelectric machine rotor
US3660702A (en) * 1970-05-11 1972-05-02 Hitachi Ltd Direct-cooled rotor for rotary electric machines
DE3334501A1 (en) * 1982-09-25 1984-03-29 Fuji Electric Co., Ltd., Kawasaki, Kanagawa Method for producing laminated iron cores for electrical machines and apparatuses, and an arrangement of a laminated iron core produced according to said method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20110221286A1 (en) * 2010-03-12 2011-09-15 Nippon Soken, Inc. Electric rotating machine
US10468741B2 (en) 2013-09-15 2019-11-05 Elta Systems Ltd. Phased array antenna assembly

Also Published As

Publication number Publication date
HRP990235A2 (en) 2001-10-31
AU5834400A (en) 2001-02-13

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