[go: up one dir, main page]

WO2025160648A1 - Machine électrique à flux axial et couvercle d'une machine électrique à flux axial - Google Patents

Machine électrique à flux axial et couvercle d'une machine électrique à flux axial

Info

Publication number
WO2025160648A1
WO2025160648A1 PCT/BR2025/050036 BR2025050036W WO2025160648A1 WO 2025160648 A1 WO2025160648 A1 WO 2025160648A1 BR 2025050036 W BR2025050036 W BR 2025050036W WO 2025160648 A1 WO2025160648 A1 WO 2025160648A1
Authority
WO
WIPO (PCT)
Prior art keywords
cooling channel
cover
cooling
expansion
axial
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.)
Pending
Application number
PCT/BR2025/050036
Other languages
English (en)
Portuguese (pt)
Inventor
João Paulo Correa MANENTE
Samuel Santos Borges
Thiago Piazera CARVALHO
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.)
WEG Equipamentos Eletricos SA
Original Assignee
WEG Equipamentos Eletricos 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 WEG Equipamentos Eletricos SA filed Critical WEG Equipamentos Eletricos SA
Publication of WO2025160648A1 publication Critical patent/WO2025160648A1/fr
Pending legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • 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
    • 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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K9/00—Arrangements for cooling or ventilating
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K9/00—Arrangements for cooling or ventilating
    • H02K9/08—Arrangements for cooling or ventilating by gaseous cooling medium circulating wholly within the machine casing
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K9/00—Arrangements for cooling or ventilating
    • H02K9/10—Arrangements for cooling or ventilating by gaseous cooling medium flowing in closed circuit, a part of which is external to the machine casing
    • H02K9/12—Arrangements for cooling or ventilating by gaseous cooling medium flowing in closed circuit, a part of which is external to the machine casing wherein the cooling medium circulates freely within the casing
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K9/00—Arrangements for cooling or ventilating
    • H02K9/19—Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil

Definitions

  • the present invention relates to an axial flux electrical machine and, more specifically, to an axial flux motor or generator.
  • Axial electromagnetic flux electric machines are widely known in the art, and basically comprise at least one stator and at least one disc-shaped rotor, in which the electromagnetic flux travels in the axial direction of the rotating shaft of the machine. They can comprise both electric motors and electric generators.
  • an external mechanism such as a pump or compressor, pumps coolant fluid into the motor (preferably inside the casing and/or stator), so that the fluid can extract heat from the motor.
  • EP2606561 shows an electrical machine with an annular chamber through which a cooling medium can circulate around the stator coils.
  • Document KR101999860 discloses an electric motor with a cooling solution comprising a coolant distribution chamber that includes a portion of the introduced coolant and a second coolant distribution path to guide another portion of the coolant to the side of the rear cover.
  • Document WO2019/171318 discloses a cooling component for an electric motor comprising a channel defined by an outer ring, an inner ring concentric to the outer ring and linear segments extending radially from the inner ring towards the outer ring.
  • the present invention relates to an electrical machine cover and an axial flux electrical machine comprising such an electrical machine cover.
  • the axial flux electric machine comprises a housing with at least one cover, the at least one cover comprising at least one cooling channel through which a cooling gas passes, the at least one cooling channel comprising at least one expansion region designed to ensure a controlled expansion of the cooling gas.
  • the cover comprises a refrigerant inlet and a refrigerant outlet and, preferably, the expansion region has a cross-sectional area with a cross-sectional expansion ratio of between 150% and 1000% from the refrigerant inlet to the refrigerant outlet.
  • the expansion region is formed as a part of the geometry of the cooling channel.
  • the cooling channel may be formed directly integrated with the lid. However, in an alternative embodiment, the cooling channel may be formed in a structure coupled to the lid.
  • Figure 1 is a perspective view of an axial flux electrical machine according to an embodiment of the present invention.
  • Figure 2 is a plan view of an axial flux electrical machine according to an embodiment of the present invention.
  • Figure 3 - is a schematic view showing the assembly of some internal components of an axial flux electrical machine according to an embodiment of the present invention.
  • Figure 4 - is a schematic illustration of four possible configurations for a cooling channel of an axial flux electrical machine according to the present invention.
  • Figure 1 shows an axial flux electric motor according to an embodiment of the present invention.
  • the electric motor comprises at least a cover 1, a central through hole 2 and coolant inlet holes 3 and outlet holes 4.
  • the through hole 2 is intended for receiving a shaft, however, it should be understood that in other embodiments of the invention, the shaft could be integrated into the motor.
  • the machine may comprise a housing with a body closed by a cover or covers connected together to form an enclosure.
  • the enclosure could be formed differently, for example with a central body part and two side covers.
  • the lid 1 comprises at least one cooling channel 5 for the circulation of a refrigerant fluid and, more specifically, of a refrigerant gas.
  • FIG. 1 and 2 show, schematically, the refrigeration circuit C of the refrigerant gas.
  • the at least one cooling channel 5, which is illustrated for visualization in figures 1 and 2 can be formed directly integrated with the cover, for example, as a casting or machined part, or it may be formed into a coupled structure, for example, into a coupled inner overcover.
  • the present invention proposes the formation of at least one expansion region E in the at least one cooling channel 5.
  • This expansion region is designed to ensure a controlled expansion of the cooling gas, so that the gas temperature reduces to levels suitable for avoiding external freezing and abrupt pressure drops, maintaining the efficiency of the cooling circuit C.
  • the cooling channel 5 requires an expansion of the cross-sectional area between the fluid inlet and the fluid outlet.
  • Such expansion preferably has a cross-sectional expansion ratio between 150% and 1000% from the refrigerant inlet to the refrigerant outlet.
  • Such expansion may preferably occur smoothly, as shown in the exemplary embodiment of figure 4a, or abruptly, as shown in figure 4b.
  • the area expansion rate per channel length should not exceed a rate of 4000%/m.
  • the expansion region E is formed as part of the geometry of the cooling channel and comprises a region capable of controllingly expanding a gas passing through it.
  • the cross-section of the channel 5 may have different shapes, such as circular, elliptical, rectangular, trapezoidal, or polygonal. Cooling channels may also be designed with custom or irregular shapes to meet specific site conditions or flow requirements, as long as the area expansion ratio criteria are met.
  • the stator 6 of the machine is coupled to the cover 1 and, in this embodiment, the at least one cooling channel 5 is particularly efficient for cooling the stator 6.
  • the one or more expansion regions can be strategically provided with defined geometries and locations to avoid hot spots in the fixed stator on the inside of the lid.
  • a bearing 7 can also be provided for receiving the shaft 8 of the machine and this bearing 7 is also efficiently cooled by the cooling system (cooling channel 5) of the cover 1.
  • the lid 1 may further comprise a seal to prevent leakage of the refrigerant gas.
  • FIG. 4 shows a schematic illustration of four possible configurations a, b, c and d for a cooling channel of an axial flux electric machine according to the present invention.
  • the expansion regions E are formed by different geometries. It should be emphasized that the expansion region could have other geometries, as long as it allows a controlled expansion of the cooling gas.
  • the channels are of different shapes between the refrigerant fluid inlet and the refrigerant fluid outlet, such as circular - see figures 4a and 4b, polygonal (figure 4c) and serpentine (figure 4d).
  • the present invention by providing at least one expansion region E in the cooling channel, uses the temperature reduction due to gas expansion to improve the cooling performance of an axial flow machine.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Motor Or Generator Cooling System (AREA)

Abstract

La présente invention concerne une machine électrique à flux axial (1) comprenant au moins un couvercle (1), le couvercle (1) comportant au moins un canal de réfrigération (5) par lequel passe un gaz de réfrigération, ledit au moins un canal de réfrigération (5) présentant au moins une zone de dilatation (E) conçue pour assurer une dilatation contrôlée du gaz de réfrigération.
PCT/BR2025/050036 2024-02-01 2025-02-01 Machine électrique à flux axial et couvercle d'une machine électrique à flux axial Pending WO2025160648A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US202463548654P 2024-02-01 2024-02-01
US63/548,654 2024-02-01

Publications (1)

Publication Number Publication Date
WO2025160648A1 true WO2025160648A1 (fr) 2025-08-07

Family

ID=96589110

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/BR2025/050036 Pending WO2025160648A1 (fr) 2024-02-01 2025-02-01 Machine électrique à flux axial et couvercle d'une machine électrique à flux axial

Country Status (1)

Country Link
WO (1) WO2025160648A1 (fr)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040000820A1 (en) * 2002-06-13 2004-01-01 Cromas Joseph Charles Automotive generator
US20050134125A1 (en) * 2003-12-19 2005-06-23 Daewoo Heavy Industries & Machinery Ltd. Cooling device for built-in-spindle type spindle motor of machine tool
KR20060068667A (ko) * 2004-12-16 2006-06-21 두산인프라코어 주식회사 전동기의 냉각구조
KR20140119300A (ko) * 2013-03-28 2014-10-10 현대모비스 주식회사 하우징어셈블리 및 축방향자속모터
US10050495B2 (en) * 2010-08-25 2018-08-14 Clean Wave Technologies, Inc. Systems and methods for regulating fluid flow for internal cooling and lubrication of electric machines
US20210075282A1 (en) * 2018-03-08 2021-03-11 Texa Dynamics S.R.L. Cooling component for electric motor
US20220393543A1 (en) * 2019-11-06 2022-12-08 Eaton Intelligent Power Limited Axial flux motor with cooling jacket

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040000820A1 (en) * 2002-06-13 2004-01-01 Cromas Joseph Charles Automotive generator
US20050134125A1 (en) * 2003-12-19 2005-06-23 Daewoo Heavy Industries & Machinery Ltd. Cooling device for built-in-spindle type spindle motor of machine tool
KR20060068667A (ko) * 2004-12-16 2006-06-21 두산인프라코어 주식회사 전동기의 냉각구조
US10050495B2 (en) * 2010-08-25 2018-08-14 Clean Wave Technologies, Inc. Systems and methods for regulating fluid flow for internal cooling and lubrication of electric machines
KR20140119300A (ko) * 2013-03-28 2014-10-10 현대모비스 주식회사 하우징어셈블리 및 축방향자속모터
US20210075282A1 (en) * 2018-03-08 2021-03-11 Texa Dynamics S.R.L. Cooling component for electric motor
US20220393543A1 (en) * 2019-11-06 2022-12-08 Eaton Intelligent Power Limited Axial flux motor with cooling jacket

Similar Documents

Publication Publication Date Title
US11309756B2 (en) Motor
US11177489B2 (en) Centrifugal compressor with diffuser
US8901791B2 (en) Internal thermal management for motor driven machinery
CA2817064C (fr) Machines electriques a flux axial
KR102508011B1 (ko) 베어링 냉각 수로를 포함하는 터보 압축기
BR102015019631A2 (pt) bomba de refrigeração elétrica
US11973407B2 (en) Thermal management techniques for electric motors
KR20220003578A (ko) 고정자 블록, 고정자 어셈블리 및 고정자 어셈블리의 냉각 시스템
US20220190682A1 (en) Motor-cooling apparatus
US20200313499A1 (en) End turn cooling
CN119042235A (zh) 轴向磁悬浮轴承、磁悬浮旋转机械
JP5388961B2 (ja) 回転電機
JP2001078390A (ja) 回転電機
CN119021977A (zh) 轴向磁悬浮轴承、磁悬浮旋转机械
US4364241A (en) Device for draining cooling liquid from rotary electric machine with liquid cooled rotor
WO2025160648A1 (fr) Machine électrique à flux axial et couvercle d'une machine électrique à flux axial
US11005341B2 (en) Sealing structure for peripheral area of generator fan
JP6246388B2 (ja) 回転電機
CN119021976A (zh) 轴向磁悬浮轴承、磁悬浮旋转机械
KR101373070B1 (ko) 초고속 회전체를 이용한 기체 압축장치 및 이를 포함하는 기체 압축 시스템
WO2025001015A1 (fr) Moteur électrique
JP2000295818A (ja) 液冷式回転電機
RU2717838C1 (ru) Электрическая машина многороторная с комбинированной системой охлаждения
CN116710636A (zh) 旋转机械以及使用了该旋转机械的制冷装置
CN223035510U (zh) 轴向磁悬浮轴承、磁悬浮旋转机械

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 25747370

Country of ref document: EP

Kind code of ref document: A1