IT202100024977A1 - HEAT EXCHANGER OF ELECTRIC MACHINE - Google Patents
HEAT EXCHANGER OF ELECTRIC MACHINE Download PDFInfo
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- IT202100024977A1 IT202100024977A1 IT102021000024977A IT202100024977A IT202100024977A1 IT 202100024977 A1 IT202100024977 A1 IT 202100024977A1 IT 102021000024977 A IT102021000024977 A IT 102021000024977A IT 202100024977 A IT202100024977 A IT 202100024977A IT 202100024977 A1 IT202100024977 A1 IT 202100024977A1
- Authority
- IT
- Italy
- Prior art keywords
- electric machine
- metal portions
- magnetic cores
- exchanger
- heat exchanger
- Prior art date
Links
- 229910052751 metal Inorganic materials 0.000 claims description 26
- 239000002184 metal Substances 0.000 claims description 26
- 238000004804 winding Methods 0.000 claims description 11
- 239000000110 cooling liquid Substances 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 7
- 239000007788 liquid Substances 0.000 description 4
- 230000017525 heat dissipation Effects 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 230000000699 topical effect Effects 0.000 description 1
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K3/00—Details of windings
- H02K3/04—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors
- H02K3/24—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors with channels or ducts for cooling medium between the conductors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/08—Cooling; Ventilating
- H01F27/10—Liquid cooling
-
- 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
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K9/00—Arrangements for cooling or ventilating
- H02K9/22—Arrangements for cooling or ventilating by solid heat conducting material embedded in, or arranged in contact with, the stator or rotor, e.g. heat bridges
- H02K9/223—Heat bridges
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D1/00—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators
- F28D1/02—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid
- F28D1/04—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits
- F28D1/047—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits the conduits being bent, e.g. in a serpentine or zig-zag
- F28D1/0477—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits the conduits being bent, e.g. in a serpentine or zig-zag the conduits being bent in a serpentine or zig-zag
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F1/00—Tubular elements; Assemblies of tubular elements
- F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
- F28F1/12—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element
- F28F1/14—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element and extending longitudinally
- F28F1/20—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element and extending longitudinally the means being attachable to the element
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Separation By Low-Temperature Treatments (AREA)
- Motor Or Generator Cooling System (AREA)
- Compression-Type Refrigeration Machines With Reversible Cycles (AREA)
Description
Domanda di brevetto per invenzione industriale dal titolo: Patent application for industrial invention entitled:
SCAMBIATORE DI CALORE DI MACCHINA ELETTRICA HEAT EXCHANGER OF ELECTRIC MACHINE
DESCRIZIONE DESCRIPTION
La presente invenzione riguarda uno scambiatore di calore. The present invention relates to a heat exchanger.
In particolare, la presente invenzione concerne uno scambiatore di calore a liquido di una macchina elettrica statica il cui circuito magnetico comprende dei traferri. In particular, the present invention relates to a liquid heat exchanger of a static electric machine whose magnetic circuit comprises air gaps.
La presente invenzione ha inoltre ad oggetto una macchina elettrica statica comprendente uno scambiatore di calore a liquido. The present invention also relates to a static electric machine comprising a liquid heat exchanger.
Le macchine elettriche, destinate a molteplici utilizzi che non rilevano ai fini della presente trattazione, necessitano, ai fini del raggiungimento di buone e costanti prestazioni, dello smaltimento del calore generato al proprio interno. Electric machines, intended for multiple uses that are not relevant for the purposes of this discussion, need, in order to achieve good and constant performance, the disposal of the heat generated internally.
Le problematiche connesse ad un efficace smaltimento del calore sono sempre di estrema attualit? nella costruzione delle macchine elettriche poich?, per raggiungere potenze e prestazioni sempre maggiori devono conseguentemente essere accresciute anche l?efficienza e la capacit? dei dispositivi utilizzati per smaltire il calore in esse generato. Are the problems associated with effective heat dissipation always extremely topical? in the construction of electric machines since?, to reach ever greater power and performance must consequently also be increased? efficiency and capacity? of the devices used to dispose of the heat generated in them.
Un esempio, non limitativo, di macchina elettrica in cui si rivela assai utile lo smaltimento del calore ? quello degli induttori trifase. A non-limiting example of an electric machine in which heat dissipation is very useful? that of three-phase inductors.
Gli scambiatori a liquido di tipo noto e normalmente utilizzati prevedono una piastra metallica posta sostanzialmente a contatto con le parti attive della macchina elettrica, la quale piastra riceve il calore per conduzione dalle parti attive e lo dissipa trasferendolo, attraverso il metallo che ? un buon termoconduttore, all?acqua o altro liquido che lo attraversa per poi a sua volta disperderlo nell?ambiente. Known and normally used liquid heat exchangers have a metal plate placed substantially in contact with the active parts of the electric machine, which plate receives the heat by conduction from the active parts and dissipates it by transferring it through the metal which is a good heat conductor, to water or other liquid which passes through it and then in turn disperses it into the environment.
In genere, come detto, la forma nota di uno scambiatore ? una piastra con differenti forature e con idraulica asservita al trasporto del calore che viene inserita o all?interno degli avvolgimenti o all?interno dei nuclei o superficialmente all?esterno degli avvolgimenti. Generally, as mentioned, the known shape of an exchanger ? a plate with different holes and with hydraulics slaved to the transport of the heat which is inserted either inside the windings or inside the cores or superficially outside the windings.
Le citate piastre metalliche (in genere di alluminio) sono normalmente investite da campo magnetico ed il campo magnetico genera al loro interno delle perdite di energia che la macchina elettrica non accusa particolarmente in termini di temperatura ma che, comunque, peggiorano l?efficienza della macchina stessa in termini di prestazioni. The aforementioned metal plates (generally aluminum) are normally hit by a magnetic field and the magnetic field generates energy losses inside them which the electric machine does not particularly experience in terms of temperature but which, in any case, worsen the efficiency of the machine same in terms of performance.
In altri termini, i campi magnetici che investono le piastre metalliche generano delle correnti (vorticose) che peggiorano l?efficienza complessiva della macchina elettrica. In other words, the magnetic fields which strike the metal plates generate currents (whirling) which worsen the overall efficiency of the electric machine.
Inoltre, gli scambiatori di tipo noto, anche relativamente all?efficienza nello smaltimento del calore non sempre si sono mostrati esenti da inconvenienti, soprattutto con macchine elettriche di elevate prestazioni. Furthermore, the exchangers of the known type, even with regard to the efficiency in dissipating the heat, have not always shown themselves to be free from drawbacks, especially with high-performance electric machines.
Scopo della presente invenzione ? quello di proporre uno scambiatore di calore di macchina elettrica che sia esente dagli inconvenienti della tecnica nota e che garantisca al contempo un efficace smaltimento del calore ed una ottimale efficienza della macchina elettrica. Purpose of the present invention? that of proposing an electric machine heat exchanger which is free from the drawbacks of the prior art and which ensures at the same time effective heat dissipation and optimum efficiency of the electric machine.
Ulteriore scopo della presente invenzione ? quello di fornire uno scambiatore di calore di macchine elettriche che sia di pratica ed economica realizzazione e di facile installazione. Another purpose of the present invention ? that of providing a heat exchanger for electric machines which is practical and economical to make and which is easy to install.
Ancora un altro scopo della presente invenzione ? quello di fornire una macchina elettrica efficace e di elevate prestazioni. Yet another object of the present invention? to provide an effective and high performance electric machine.
Secondo l'invenzione, questi scopi ed altri ancora sono raggiunti da uno scambiatore di calore e da una macchina elettrica comprendenti le caratteristiche tecniche descritte nelle allegate rivendicazioni. According to the invention, these aims and others still are achieved by a heat exchanger and by an electric machine comprising the technical characteristics described in the attached claims.
Le caratteristiche tecniche dell'invenzione, secondo i suddetti scopi, sono chiaramente descritte nelle rivendicazioni allegate e i suoi vantaggi sono evidenti dalla descrizione dettagliata che segue, con riferimento ai disegni allegati che ne illustrano forme di realizzazione esemplificative e non limitative, in cui: - la figura 1 illustra, in una vista prospettica schematica con alcune parti asportate per meglio comprenderne altre, una forma di realizzazione dello scambiatore di calore secondo la presente invenzione, integrato in una relativa macchina elettrica; The technical characteristics of the invention, according to the aforementioned aims, are clearly described in the attached claims and its advantages are evident from the following detailed description, with reference to the attached drawings which illustrate exemplifying and non-limiting embodiments thereof, in which: - the figure 1 illustrates, in a schematic perspective view with some parts removed to better understand others, an embodiment of the heat exchanger according to the present invention, integrated in a related electric machine;
- le figure 2 e 3, illustrano, in rispettive viste schematiche in pianta dall?alto e prospettica dall?alto, la macchina elettrica di figura 1 con ulteriori parti asportate; - figures 2 and 3 show, in respective schematic top plan and top perspective views, the electric machine of figure 1 with further parts removed;
- le figure 4 e 5 illustrano, in rispettive viste prospettiche schematiche da differenti angolazioni, una variante realizzativa dello scambiatore di calore secondo la presente invenzione. - figures 4 and 5 illustrate, in respective schematic perspective views from different angles, a variant embodiment of the heat exchanger according to the present invention.
Secondo quanto illustrato in figura 1, con il numero 1 di riferimento ? indicata nel suo complesso una macchina elettrica integrante uno scambiatore 2 di calore realizzato in accordo con la presente invenzione. According to what is illustrated in figure 1, with the reference number 1 ? indicated as a whole an electric machine integrating a heat exchanger 2 made in accordance with the present invention.
In dettaglio, a titolo esemplificativo la macchina 1 elettrica di figura 1 ? una macchina trifase e per ciascuna fase F1, F2, F3 comprende un rispettivo scambiatore 2 di calore; solamente uno dei tre scambiatori 2 di calore, quello relativo alla fase F1, risulta visibile in figura 1 in virt? degli elementi costruttivi che sono stati rimossi, appunto per consentirne una migliore visione. In detail, by way of example, the electric machine 1 of figure 1 ? a three-phase machine and for each phase F1, F2, F3 comprises a respective heat exchanger 2; only one of the three heat exchangers 2, the one relating to phase F1, is visible in figure 1 by virtue of of the construction elements that have been removed, precisely to allow a better view.
La macchina 1 elettrica comprende, per ciascuna fase F1, F2 ed F3, rispettivi nuclei magnetici 3 superiori e nuclei magnetici 4 inferiori e un avvolgimento 5 che circonda esternamente tali nuclei magnetici 3, 4. The electric machine 1 comprises, for each phase F1, F2 and F3, respective upper magnetic cores 3 and lower magnetic cores 4 and a winding 5 which externally surrounds these magnetic cores 3, 4.
Secondo quanto illustrato nelle figure da 1 a 3, lo scambiatore 2 di calore comprende due porzioni P metalliche disposte in successione secondo una direzione D longitudinale determinata. As illustrated in figures 1 to 3, the heat exchanger 2 comprises two metal portions P arranged in succession according to a given longitudinal direction D.
Lo scambiatore 2 di calore comprende inoltre un condotto 6 di circolazione di un liquido di raffreddamento, il quale condotto 6 ? posto a contatto con ciascuna porzione P metallica in corrispondenza di rispettive cavit? 7 ricavate nelle porzioni P metalliche stesse. The heat exchanger 2 also comprises a duct 6 for the circulation of a cooling liquid, which duct 6 is? placed in contact with each metal portion P in correspondence with respective cavities? 7 formed in the metal portions P themselves.
Le citate cavit? 7 sono vantaggiosamente controsagomate rispetto al condotto 6 in modo da offrire una reciproca estesa superficie di contatto e, conseguentemente, di scambio termico. The aforementioned cavities? 7 are advantageously counter-shaped with respect to the duct 6 so as to offer a large mutual contact surface and, consequently, a heat exchange surface.
Rispettivi mezzi di circolazione del liquido di raffreddamento, di tipo noto e non illustrato, sono previsti appunto per far circolare il liquido di raffreddamento all?interno del condotto 6. Respective means for circulating the cooling liquid, of a known type and not shown, are provided precisely to circulate the cooling liquid inside the duct 6.
Secondo la forma realizzativa dello scambiatore 2 illustrata nelle figure 4 e 5, le porzioni P metalliche sono una pluralit?, anche in numero considerevole, disposte in successione secondo la citata direzione D longitudinale determinata. According to the embodiment of the exchanger 2 illustrated in figures 4 and 5, the metallic portions P are a plurality, even in considerable numbers, arranged in succession according to the aforementioned determined longitudinal direction D.
Il numero delle porzioni P metalliche ? chiaramente selezionato in funzione della dimensione della macchina 1 elettrica, dei traferri presenti nel nucleo magnetico in cui lo scambiatore 2 di calore ? destinato ad essere installato ed al numero di nuclei 3 magnetici presenti. Con riferimento alle forme realizzative illustrate dello scambiatore 2 secondo l?invenzione, tra le citate porzioni P metalliche sussiste una lacuna L, ovverosia un vuoto, che rende le stesse porzioni P tra loro fisicamente separate a meno del collegamento realizzato dal condotto 6 di circolazione del liquido di raffreddamento. The number of metallic portions P ? clearly selected according to the size of the electric machine 1, the air gaps present in the magnetic core in which the heat exchanger 2 ? intended to be installed and the number of magnetic cores 3 present. With reference to the illustrated embodiments of the exchanger 2 according to the invention, between the aforementioned metal portions P there is a gap L, i.e. a vacuum, which makes the same portions P physically separate from each other except for the connection made by the duct 6 for circulation of the cooling liquid.
La citata lacuna L definisce, pertanto, tra le porzioni P metalliche stesse una discontinuit? di materiale. Therefore, does the cited gap L define a discontinuity between the metal portions P themselves? of material.
Secondo varianti realizzative dello scambiatore 2 di calore non illustrate ma comunque rientranti nel medesimo concetto inventivo, la citata discontinuit? di materiale ? data non da una lacuna che definisce una separazione fisica tra due porzioni P metalliche adiacenti ma, ad esempio, da una discontinuit? nello spessore del materiale o dalla presenza di fori o aperture che contribuiscono comunque a identificare una zona di distinzione tra due porzioni P metalliche adiacenti. According to embodiments of the heat exchanger 2 not illustrated but in any case falling within the same inventive concept, the cited discontinuity? of material? given not by a gap that defines a physical separation between two adjacent metal portions P but, for example, by a discontinuity? in the thickness of the material or by the presence of holes or openings which in any case contribute to identifying a zone of distinction between two adjacent metal portions P.
Vantaggiosamente, tale discontinuit?, indifferentemente definita da una lacuna o da una ridotta presenza di materiale (in virt? di un ridotto spessore del materiale metallico o della presenza di fori o aperture) ? disposta in corrispondenza di un rispettivo traferro di una macchina elettrica configurato per aumentare la riluttanza del circuito magnetico che in essa si instaura. Advantageously, this discontinuity, indifferently defined by a gap or by a reduced presence of material (by virtue of a reduced thickness of the metallic material or the presence of holes or openings) is? arranged in correspondence with a respective air gap of an electric machine configured to increase the reluctance of the magnetic circuit established in it.
Vantaggiosamente, si ? verificato sia sperimentalmente che mediante simulazioni agli elementi finiti, che il fatto di eliminare in tutto o in parte il materiale metallico dello scambiatore 2 che si trova che si trova in corrispondenza dei traferri (mediante la distinzione tra porzioni P metalliche adiacenti) implica come diretta conseguenza il fatto di eliminare o comunque ridurre drasticamente il fenomeno delle correnti vorticose, cos? incrementando l?efficienza della macchina elettrica. Advantageously, yes? verified both experimentally and by means of finite element simulations, that the fact of eliminating all or part of the metallic material of the exchanger 2 which is located in correspondence with the air gaps (by means of the distinction between adjacent metallic portions P) implies as a direct consequence the fact of eliminating or in any case drastically reducing the phenomenon of swirling currents, cos? increasing the efficiency of the electric car.
Secondo quanto illustrato nelle allegate figure, in entrambe le forme realizzative dello scambiatore 2 le citate porzioni P metalliche presentano vantaggiosamente sezione trasversale conformata ad H, con una rispettiva zona 8 centrale e due ali 9, 10 laterali. As illustrated in the attached figures, in both embodiments of the exchanger 2 the metal portions P advantageously have an H-shaped cross section, with a respective central zone 8 and two lateral wings 9, 10.
Con l?espressione sezione trasversale si intende l?ingombro della porzione P metallica su un piano perpendicolare alla citata direzione D longitudinale determinata. The expression cross section refers to the overall dimensions of the metal portion P on a plane perpendicular to the aforementioned determined longitudinal direction D.
Come chiaramente illustrato in figura 1, la zona 8 centrale della porzione P metallica conformata ad H ? atta ad essere interposta tra due nuclei 3, 4 magnetici rispettivamente superiore e inferiore della macchina 1 elettrica, mentre le due ali 9, 10 laterali sono atte ad essere interposte tra i nuclei magnetici 3, 4 e i rispettivi avvolgimenti 5 esterni. As clearly illustrated in figure 1, the central region 8 of the metal portion P shaped like an H? adapted to be interposed between two magnetic cores 3, 4 respectively upper and lower of the electric machine 1, while the two lateral wings 9, 10 are adapted to be interposed between the magnetic cores 3, 4 and the respective external windings 5.
Secondo le forme realizzative illustrate dello scambiatore 2, ciascuna porzione P metallica avente sezione trasversale conformata ad H comprende una prima piastra 11 metallica definente la citata zona 8 centrale, una seconda 12 ed una terza 13 piastra definenti le citate due ali 9, 10 laterali. According to the illustrated embodiments of the exchanger 2, each metal portion P having an H-shaped cross section comprises a first metal plate 11 defining the aforementioned central area 8, a second 12 and a third 13 plate defining the aforementioned two lateral wings 9, 10.
Vantaggiosamente la seconda e la terza piastra 12, 13 sono collegate stabilmente alla prima piastra 11. Advantageously, the second and third plates 12, 13 are stably connected to the first plate 11.
Secondo quanto illustrato in particolare nelle figure 1 e 4, il citato condotto 6 di circolazione del liquido di raffreddamento attraversa almeno la zona 8 centrale delle porzioni P metalliche ed ? su tali zone 8 centrali che sono ricavate le sopra citate cavit? 7. As shown in particular in figures 1 and 4, the cited duct 6 for circulation of the cooling liquid crosses at least the central area 8 of the metal portions P and ? on these central zones 8 which are obtained the aforementioned cavities? 7.
Nel caso, come quello illustrato, di un condotto 6 di circolazione a conformazione tubolare cilindrica, le citate cavit? 7 presentano anch?esse una parete semicilindrica controsagomata per aderire al condotto 6 stesso e garantire una efficace trasmissione del calore per conduzione tra le porzioni P metalliche ed il condotto 6. In the case, like the one illustrated, of a circulation duct 6 with a cylindrical tubular shape, the cited cavities 7 also have a counter-shaped semi-cylindrical wall to adhere to the duct 6 itself and ensure effective heat transmission by conduction between the metal portions P and the duct 6.
La sopra descritta forma ad H delle porzioni P metalliche implica considerevoli vantaggi. The H shape described above of the metal portions P implies considerable advantages.
Per prima cosa, la conformazione ad H senza incidere sulle dimensioni complessive della macchina consente di incrementare la superficie di scambio: da una parte verso il nucleo magnetico e dall?altra verso l?avvolgimento. Non si incrementano le dimensioni complessive in quanto le piastre 12, 13 definenti le ali 9, 10 dell?H occupano la zona di aria normalmente esistente nella macchina elettrica intorno al nucleo e adibita a distanziare il nucleo dall?avvolgimento. First of all, the H shape without affecting the overall dimensions of the machine allows to increase the heat exchange surface: on one side towards the magnetic core and on the other towards the winding. The overall dimensions are not increased since the plates 12, 13 defining the wings 9, 10 of the H occupy the area of air normally existing in the electric machine around the core and used to distance the core from the winding.
Nelle macchine raffreddate ad aria questa zona o ?canale? ? utilizzato per finalit? di raffreddamento ma in quelle raffreddate ad acqua, come quelle cui la presente invenzione ? riferita, ? sostanzialmente dannoso in quanto contribuisce al riscaldamento dell?ambiente circostante. In air-cooled machines this area or ?channel? ? used for purpose? of cooling but in those cooled by water, such as those to which the present invention? referred, ? substantially harmful as it contributes to the heating of the surrounding environment.
In sintesi, grazie alla configurazione ad H si raggiungono molteplici vantaggi: In summary, thanks to the H configuration, multiple advantages are achieved:
- si riduce la dispersione di energia verso l?aria e l?ambiente circostante, - the dispersion of energy towards the air and the surrounding environment is reduced,
- si aumenta la superficie di scambio termico verso il nucleo, - the heat exchange surface towards the core is increased,
- si aumenta la superficie di scambio termico verso l?avvolgimento, evitando magari anche il ricorso ad ulteriori scambiatori agenti, dall?esterno sull?avvolgimento. - the heat exchange surface towards the winding is increased, possibly also avoiding the use of additional heat exchangers acting on the winding from the outside.
Claims (8)
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WO2011038184A1 (en) * | 2009-09-24 | 2011-03-31 | Parker Hannifin Corporation | Embedded cooling of wound electrical components |
US20180199466A1 (en) * | 2017-01-06 | 2018-07-12 | Raytheon Company | Adaptable thin section liquid pump for electronics cooling systems or other systems |
US20190006082A1 (en) * | 2017-06-28 | 2019-01-03 | Prippell Technologies, Llc | Fluid cooled magnetic element |
GB2580262A (en) * | 2017-10-26 | 2020-07-15 | Mitsubishi Electric Corp | Heat sink and circuit device |
US20190394907A1 (en) * | 2018-06-26 | 2019-12-26 | Ford Glogal Technologies, LLC | Vehicle Power Module Assembly |
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