WO2022067404A1 - Sistema dedicado de arrefecimento a ar para mancais de máquinas elétricas girantes e máquina elétrica girante correspondente - Google Patents
Sistema dedicado de arrefecimento a ar para mancais de máquinas elétricas girantes e máquina elétrica girante correspondente Download PDFInfo
- Publication number
- WO2022067404A1 WO2022067404A1 PCT/BR2020/050392 BR2020050392W WO2022067404A1 WO 2022067404 A1 WO2022067404 A1 WO 2022067404A1 BR 2020050392 W BR2020050392 W BR 2020050392W WO 2022067404 A1 WO2022067404 A1 WO 2022067404A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- bearing
- bearings
- deflector
- rotary electric
- air flow
- Prior art date
Links
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
- 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 pertains to the field of rotating electrical machines, in particular arrangements for cooling or ventilation of enclosures, envelopes and supports of elements of rotating electrical machines.
- Rotating electrical machines or simply electric motors are equipment used for the transformation of electrical energy into mechanical.
- the rotating electrical machines basically comprise four structures, which are housing, stator, rotor and bearings/covers. In addition to these elements, depending on the different characteristics of each rotating electrical machine, there may also be auxiliary systems such as cooling, lubrication, excitation, among others.
- the housing is the element responsible for the integration of the structures, housing the stator and rotor and any auxiliary systems.
- the stator is the active component (energized), static, responsible for driving the magnetic flux to rotate the rotor.
- the rotor is the active (energized), rotating component of the rotating electrical machine.
- the bearings and covers are the elements responsible for coupling the static parts to the rotating parts of a rotating electrical machine, performing, for example, the coupling, bearing and centralization of the rotor (rotating) in relation to the stator (static).
- the term bearing is used broadly, encompassing any and all elements capable of coupling and/or bearing and/or centering, including, but not limited to, radial bearings , axial and mixed, plain bearings, bushings and the like, used alone or in combination with each other, with or without lubrication, lubrication may be by pasty (grease) compound (semiplastic) or high viscosity lubricants, by lubricating circuit and others forms of lubrication known from the prior art.
- Some applications expose the bearings to high axial forces, resulting from, for example, hydraulic loads or mechanical loads and/or radial forces, such as the rotor's own weight.
- rotating electrical machines demand highly efficient cooling solutions to cope with the high degree of heating, especially on the part of the bearing that supports the largest portion of the loading of the machine or the bearing as a whole.
- the solution of the document WO2017108562 refers to a cooling construction for oil-lubricated bearings in which the removal of heat from the bearing takes place indirectly through the thermal exchange between the insufflated air and the lubricating oil reservoir that surrounds the mancai.
- the air flow is downward and, thus, flows against the movement of hot air, whose natural tendency is to ascend.
- this flow depends on the conduction through a top cover equipped with channels built specifically for this purpose, that is, it depends on a dedicated construction and that cannot be easily applied to other engines that do not have this top cover and/or that, for For example, have plain lubricated, non-cooled bearings.
- the device of US20180241287 repeats the same characteristics of descending air flow, that is, starting from the fan towards the machine, and dedicated construction of the elements directly involved in air cooling, in addition to being applied for engines with oil-lubricated bearings.
- One of the objectives of the present invention is, therefore, to provide a ventilation system dedicated to the air cooling of rotating electrical machine bearings in accordance with the characteristics of claim 1 of the attached claim table.
- Another objective of the present invention is to provide a corresponding rotating electric machine according to the characteristics of claim 6 of the attached claim table.
- Figure 1 shows a partial side view in section of the region around the bearing that supports the largest portion of the load of a rotating electric machine equipped with a ventilation circuit with a dedicated deflector according to the invention
- Figure 2 shows a partial side view of the bearing surrounded by the deflector of figure 1;
- Figure 3 shows a partial perspective view in section of the region around the bearing that supports the largest portion of the load of a rotating electric machine equipped with a ventilation circuit with a dedicated deflector according to the invention.
- the present invention relates to a ventilation circuit comprising a deflector (100) for the dedicated cooling of bearings that support the largest portion of the loading (200) of rotor shafts (300) of rotating electrical machines (400) equipped with of at least one fan (500), which may be one or more of the fans of the ventilation circuit, preferably being, but not limited to, the external fan of the ventilation circuit.
- the deflector (100) is a preferably cylindrical element, formed by at least one cylindrical body (101) of body thickness (ei), internal diameter (110) and external diameter (120), and by a fixing flap (102) gauge/outside diameter (130) and tab thickness (ez).
- the baffle (100) has height (140), an inlet edge (150) at the end opposite the securing tab (102) and an exit edge (160) at the end of the securing tab (102).
- the fan (500) is commonly mounted on the rotor shaft (300), after the bearing (200) and therefore closer to the shaft end opposite the rotor drive/coupling shaft end (300) , being normally surrounded by a protection box (510), sucking air external to the electric motor (400) in a suction region (520), promoting a flow in the opposite direction to the fan, that is, towards the machine, and continuous of air that removes part of the heat generated by the electric motor (400) and its components, comprising, therefore, mainly the heat generated by the bearing (210) and in the region around the bearing (200), before being returned to the external environment in an exhaust region (530), which may or may not be in the protection box (510), in a manner known from the prior art.
- the air flow (170) will preferably be upwards in machines with vertical construction, while in machines with horizontal construction, the air flow (170) will move towards the rear of the electric motor (400 ).
- the deflector (100) is arranged concentrically around the bearing (200), enveloping it, and its inner diameter (110) must always be greater than the outer diameter (240), with between the bearing (200) and the deflector (100), therefore, a radial clearance (r) forming an immersion tunnel (t), in the form of a cylindrical mantle, which involves most of the external height (250) of the bearing (200).
- the deflector (100) is mounted axially out of phase with the bearing, so that there is an axial distance (a) between the base of the bearing (200) and the lower end of the deflector (100), and, optionally a projection distance (p) between the upper part of the bearing (200) and the upper end of the deflector (100).
- the axial distance (a) allows the passage of a part of the air flow sucked in the suction region (520) into the immersion tunnel (t), passing through the suction edge (150) forming a air flow (170) that moves towards the fan (500) inside the immersion tunnel (t), keeping the outer surface of the bearing (200) completely surrounded by the coldest air drawn in, being discharged from the immersion tunnel ( t) passing through the leading edge (160).
- the immersion tunnel (t) has an entrance area, in the form of a rim, considerably smaller than the suction area external to the deflector (100). momentary reduction of static pressure in the immersion tunnel region (t) and, thus, an increase in air flow velocity (170), in the immersion tunnel region (t), causing the immersion tunnel to flood (t) by the aspirated air.
- the cylindrical body (101) must be formed by at least one cross-section, preferably rectangular, and the body thickness (ei) constant. In this way, the possibility of forming a laminar flow is eliminated.
- the construction of the exit edge (160) follows the same principle of preferably rectangular section of the rectangular cross section of the fixing tab (102) and of constant tab thickness (ez).
- the fixing tab (102) can be eliminated and replaced by other ways of fixing the deflector (100) to the structure of the electric motor (400), without changing the deflector's function (100).
- the radial clearance (r) which is equivalent to half the difference between the inner diameter (110) of the deflector (100) and the outer diameter (240) of the bearing (200), must be equivalent to one value from 0.1 to 20%, preferably from 1 to 10%, preferably from 4 to 6% and preferably from 5.5% of the external diameter (240) of the bearing (200).
- the axial distance (a) must be at least equal to the radial clearance (r), and preferably greater than the radial clearance (r), with the axial distance (a) between 1 to 30%, preferably between 10 and 20%, preferably between 11 and 15% and preferably 12.5% greater than the radial clearance (r).
- the projection distance (p) represents the axial measure of how much the deflector (100) projects axially beyond one of the ends of the bearing (200) or bearing cap (230) and can be different from zero.
- the bearing (200) is a bearing formed by at least one bearing, which may be a ball bearing, which may be, but not limited to, deep groove ball bearings, angular contact and axial, self-compensating or not.
- the bearing (200) is a bearing formed by at least one bearing, which may be a roller bearing, which may be, but not limited to, cylindrical, conical, spherical or of needles, self-compensating or not.
- the bearing (200) is a plain bearing.
- a rotating electric machine is an electric motor (400) provided with a circuit that comprises a deflector (100) according to the invention.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Motor Or Generator Cooling System (AREA)
- Mounting Of Bearings Or Others (AREA)
- Motor Or Generator Frames (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/BR2020/050392 WO2022067404A1 (pt) | 2020-09-30 | 2020-09-30 | Sistema dedicado de arrefecimento a ar para mancais de máquinas elétricas girantes e máquina elétrica girante correspondente |
BR112023003433A BR112023003433A2 (pt) | 2020-09-30 | 2020-09-30 | Sistema dedicado de arrefecimento a ar para mancais de máquinas elétricas girantes e máquina elétrica girante correspondente |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/BR2020/050392 WO2022067404A1 (pt) | 2020-09-30 | 2020-09-30 | Sistema dedicado de arrefecimento a ar para mancais de máquinas elétricas girantes e máquina elétrica girante correspondente |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2022067404A1 true WO2022067404A1 (pt) | 2022-04-07 |
Family
ID=80949106
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/BR2020/050392 WO2022067404A1 (pt) | 2020-09-30 | 2020-09-30 | Sistema dedicado de arrefecimento a ar para mancais de máquinas elétricas girantes e máquina elétrica girante correspondente |
Country Status (2)
Country | Link |
---|---|
BR (1) | BR112023003433A2 (pt) |
WO (1) | WO2022067404A1 (pt) |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20050012409A1 (en) * | 2003-07-17 | 2005-01-20 | Jeumont S.A. | Device for cooling and electrical machine, in particular a synchronous electrical machine having permanent magnets |
US20060093250A1 (en) * | 2004-08-31 | 2006-05-04 | Scott Kreitzer | System for maintaining a vertical motor thrust bearing |
US20130193786A1 (en) * | 2012-01-30 | 2013-08-01 | Deere & Company | Sr motor alternative cooling device and method |
US10749389B2 (en) * | 2015-09-08 | 2020-08-18 | Siemens Aktiengesellschaft | Method and electrical machine with couplings in the cooling system |
-
2020
- 2020-09-30 BR BR112023003433A patent/BR112023003433A2/pt unknown
- 2020-09-30 WO PCT/BR2020/050392 patent/WO2022067404A1/pt active Application Filing
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20050012409A1 (en) * | 2003-07-17 | 2005-01-20 | Jeumont S.A. | Device for cooling and electrical machine, in particular a synchronous electrical machine having permanent magnets |
US20060093250A1 (en) * | 2004-08-31 | 2006-05-04 | Scott Kreitzer | System for maintaining a vertical motor thrust bearing |
US20130193786A1 (en) * | 2012-01-30 | 2013-08-01 | Deere & Company | Sr motor alternative cooling device and method |
US10749389B2 (en) * | 2015-09-08 | 2020-08-18 | Siemens Aktiengesellschaft | Method and electrical machine with couplings in the cooling system |
Also Published As
Publication number | Publication date |
---|---|
BR112023003433A2 (pt) | 2023-04-11 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
PT1979708T (pt) | Arrefecimento de rolamentos, motores e outros componentes rotativos geradores de calor | |
US8198770B2 (en) | Heat pipe bearing cooler systems and methods | |
CA1088984A (en) | Heat exchanger arrangement for cooling lubricant for vertical electric motor thrust bearing | |
KR100481600B1 (ko) | 터보 기계 | |
ES2612908T3 (es) | Bomba centrífuga | |
WO2022067404A1 (pt) | Sistema dedicado de arrefecimento a ar para mancais de máquinas elétricas girantes e máquina elétrica girante correspondente | |
CN104981611B (zh) | 涡旋式流体机械装置 | |
KR102052949B1 (ko) | 터보모터의 이중 냉각 구조 | |
BR102014021617A2 (pt) | motobomba de mancal flutuante arrefecida por um fluido circulante | |
US3870907A (en) | Lubricant cooling apparatus for a vertical electric motor | |
BR112015026027B1 (pt) | Bomba de vácuo de palheta rotativa | |
JP5550506B2 (ja) | 立軸回転電機 | |
JP2007215261A (ja) | 空冷式電動機 | |
KR100868896B1 (ko) | 포일베어링과 이를 이용한 모터 | |
EP3626987A1 (en) | Thrust bearing cooling device | |
CN106593919A (zh) | 一种300kw磁悬浮高速风机结构 | |
KR102005232B1 (ko) | 열사이펀을 이용한 터보모터의 냉각 구조 | |
BRPI1103384A2 (pt) | sistema de bombeamento e eixo para sistema de bombeamento de àleo para compressores hermÉticos e compressor compreendendo o sistema e/ou eixo | |
JP6298858B2 (ja) | 真空ポンプ | |
CN105099081B (zh) | 发电机及发电装置 | |
JPH0416052Y2 (pt) | ||
JPH0716103Y2 (ja) | 立軸形回転電機の空冷式ガイド軸受装置 | |
JPS62197795U (pt) | ||
JPS62111200A (ja) | 燃焼用フアン | |
JPS62197794U (pt) |
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: 20955477 Country of ref document: EP Kind code of ref document: A1 |
|
REG | Reference to national code |
Ref country code: BR Ref legal event code: B01A Ref document number: 112023003433 Country of ref document: BR |
|
ENP | Entry into the national phase |
Ref document number: 112023003433 Country of ref document: BR Kind code of ref document: A2 Effective date: 20230224 |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
122 | Ep: pct application non-entry in european phase |
Ref document number: 20955477 Country of ref document: EP Kind code of ref document: A1 |