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
  • H02K5/22—Auxiliary parts of casings not covered by groups H02K5/06-H02K5/20, e.g. shaped to form connection boxes or terminal boxes
• • 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

Definitions

• the present invention relates to rotating electrical machines and more particularly, but not exclusively, industrial alternators.
• the application FR 2 842 367 A1 discloses an electric machine having on the front side an enlarged part in which a fan rotates and made with air outlet grids obtained in one piece by molding material with the rest of the enlarged part. .
• connection to the engine is made with a plate attached to the enlarged part.
• No deflector is provided inside the enlarged part, to deflect the air flow generated by the fan before its output by the grids.
• the interface with the drive motor can be of different dimensions, and of different shapes.
• connection of the fixed part of the alternator to the motor is generally done by an interlocking, in particular with short centering and with a pierced support face to receive screws.
• the same mechanism can accommodate several lengths of active part, and therefore correspond to several machine powers whose cooling needs are different. Therefore, either the dimensioning of the average cooling torque / coupling flange is unique and wedged on the greatest need, or it is adapted to the need of each power. In the first case, the cost of the machines of less need is penalized, and in the second case, we increase the multiplicity of parts and thus we reduce the volume of each reference, with a detrimental impact on their cost, as mentioned above. above.
• the operating cost is such that optimization of the overall efficiency of energy production is sought.
• the efficiency of the alternator takes precedence over the power and the limitation of the losses is synonymous with a need for reduced ventilation.
• the subject of the invention is an electric machine, in particular an alternator, intended to be coupled to a driving or driven machine, notably a heat engine, comprising:
• this flange for connection to the driving or driven machine, this flange comprising:
• the flange advantageously houses a fan driven by the rotor.
• the invention has many advantages.
• the rear part can be a part common to all the variations of machines built with the same magnetic circuit. No matter the power, the mechanical engine interface, or the need for ventilation, this room remains the same. Its manufacturing cost can therefore be optimized thanks to the volume to be produced, and it is preferably produced by injection of metal, in particular aluminum.
• the front part of the interface can be the subject of different variants that allow to adapt the interface of the machine to the various standardized interfaces according to the aforementioned SAE standard, or even to configure the machine in two-bearing version.
• the variety of parts is therefore limited to these parts, low mass.
• the manufacturing means of these parts may be different depending on the variants and the quantity to be produced for each variant, and the front part may be made by cast iron foundry, aluminum foundry, aluminum injection, or oxy-cut steel, among other techniques. .
• the front portion being removable, it allows to accommodate in the flange a large diameter fan that could not be introduced into a one-piece flange.
• the front portion can thus have a central opening, and the fan have an outer diameter greater than that of the central opening.
• This configuration therefore advantageously makes it possible to respond to the three problems mentioned above, while reducing the overall cost of the function.
• the flange may have one or more mounting studs extending therein between the front and rear portions.
• the machine preferably comprises one or more deflectors fixed on the flange.
• the shape and arrangement of the mounting stud or pads advantageously to receive the air deflector (s). By creating a kind of volute, this or these deflectors have the ability to limit the pressure drop at the air outlet, thus significantly increasing the air flow and thus the cooling efficiency of the machine.
• the baffle or baffles may be injected plastic, and their cost is then very low. At least one air deflector may be attached to the flange via at least one of said pads. The baffle may be removably attached to the flange.
• the attachment or defectors can be made by slide and pinch between the two front and rear portions of the flange.
• the deflector may be arranged to fit between two adjacent studs, in particular to be slidably mounted thereon.
• the mounting pads can be made of material with the rear part.
• the mounting pads may have tapped holes for receiving screws for fixing one of the parts on the other.
• the flange may comprise at least one air outlet grille, in particular two grids assembled together.
• the baffle or baffles guide the air to the exit grid (s).
• the rear part can be attached and fixed in various ways on the fixed part of the machine.
• the rear portion is fixed on the fixed part by screwing, in particular by screwing through tie rods.
• the invention further relates to a range of electrical machines comprising at least two electrical machines according to the invention, as defined above, these machines having the same rear flange portion and different front parts.
• the subject of the invention is also a range comprising two electrical machines, these machines comprising the same rear parts, and possibly the same front parts as well, and for one of the machines, at least one deflector, preferably disposed on at least one side. one of said mounting pads, this deflector being absent on the other machine.
• FIG. 1 represents, schematically and in perspective, an example of a machine made according to the invention
• FIG. 2 is an exploded view of the coupling flange of the machine of FIG. 1.
• the machine 1 shown in Figures 1 and 2 is an alternator intended to be coupled to a driving machine, for example a heat engine, known in itself and not shown.
• the machine 1 comprises a rotor intended to be rotated about an axis of rotation X, rotating inside a stator housed in a housing 10 of the machine, the latter resting for example as illustrated by tabs 11 on a support not shown.
• the machine 1 may comprise a housing 12 housing for example a terminal block for connecting the machine to an installation intended to be powered by the electricity produced by the alternator, the housing 12 may also include, if necessary, a regulator and / or any other useful electronic circuits.
• the casing 10 is preferably metallic.
• the machine 1 is provided at the front with a coupling flange 20 which serves for its connection with the driving machine.
• the flange 20 which is shown in more detail in FIG. 2, comprises a rear part 21, which is connected to the fixed part of the machine, in this case the casing 10, and a front part 22 interface with the driving machine, this front portion 22 being attached to the rear portion 21.
• the fixing of the rear portion 21 on the housing 10 can be done by screwing through tie rods, one end of which is located in tapped holes in the rear portion 21.
• the fixing of the rear portion 21 on the fixed part 10 is done differently.
• the front portion 22 can be attached to the rear portion 21 with screws 23 screwed into mounting studs 24, the latter having threaded holes 26 provided for this purpose.
• the mounting pads 24 are made in one piece with the rear portion 21, for example by aluminum injection.
• the number of pads 24 is a function of requirements and is preferably at least four, being in the example of eight, the pads 24 being arranged in pairs substantially in the four corners of the rear portion 21.
• a fan 30 is disposed inside the flange 20, between the mounting studs 24.
• the front interface portion 22 has a central opening 33 whose diameter is smaller than the outside diameter of the fan 30 , the latter being fixed on the rotor while the front portion of interface 22 is not yet in place on the rear portion 21.
• the flange 20 comprises two air outlet grids 40 which are joined to one another by fastening elements 50 such as screws, as shown in FIG. 1, these fastening elements 50 being for example engaged in bores formed on flanges 53 made at the end of the grids 40.
• the latter each comprise a notch 56.
• the notches 56 correspond to clearances which allow access to the cavity of a lifting ring which is in the upper part of the rear part of the flange.
• the flange 20 comprises volute portions 60 which, in the example shown, are connected to the mounting studs 24, being for example made in the form of webs of material integrally with the latter by molding.
• volute portions 60 as well as any webs of material 62 which connect them to the mounting pads 24 contribute to stiffening the latter and to increasing the mechanical strength of the assembly of the front portion 22 on the rear portion 21.
• the flange 20 comprises reliefs 70 arranged to allow the attachment of deflectors 80, the latter may or may not be provided in the flange 20 depending on the ventilation requirements.
• these deflectors 80 are located inside the flange 20 and complete the volute portions 60 by defining a deflection surface of the air which is smooth and arranged to guide the air driven by the fan to the grids 40 air outlet, and allow to obtain a gradual relaxation of the air coming out of the fan.
• the shape of each of the deflectors 80 is a spiral arc.
• the baffles 80 are preferably made of thermoplastic material.
• the mounting of the deflectors 80 on the reliefs 70 can be effected for example by sliding, the reliefs 70 then being for example in the form of grooves oriented parallel to the axis of rotation X, these grooves being made at the end of the portions of volute 60.
• the deflectors 80 are also clamped between the facing faces of the front and rear parts, when they are assembled to one another.
• the front portion of interface 22 is preferably made to meet a standard for the coupling of heat engines and alternators, in particular SAE J 617.
• the machine may thus comprise a set of circular bores 61 arranged around its central opening 33.
• the machine may comprise a coupling disk 90 fixed at its center on the rotor shaft and having at its periphery bores for fastening to the rotor. driving machine tree.
• Elongated oblong vents 62 can lighten the workpiece and avoid foundry shrinkage.
• the shape of the front portion of interface 22 can be modified so as to adapt it to different driving machines.
• the machine has a housing 10 but it is not beyond the scope of the present invention when it is absent.
• the front interface portion 22 may be other than realized to meet the SAE J 617 standard.
• the deflector (s) 80 can be fixed inside the flange 20 other than on reliefs 70 made with the mounting studs 24.
• the deflectors allowing the optimization of the air flow can thus have shapes and modes of different fixation. They can be obtained in different ways and made in different materials.

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

Applications Claiming Priority (2)

Publications (1)

Family

ID=48979850

Family Applications (1)

Country Status (5)

Families Citing this family (4)

Citations (1)

Family Cites Families (9)

• 2013
  • 2013-03-04 FR FR1351892A patent/FR3002822B1/fr active Active
  • 2013-10-24 CN CN201320659859.4U patent/CN203984161U/zh not_active Expired - Lifetime
• 2014
  • 2014-03-04 EP EP14711007.6A patent/EP2965406A2/de not_active Withdrawn
  • 2014-03-04 WO PCT/IB2014/059417 patent/WO2014136042A2/fr not_active Ceased
  • 2014-03-04 US US14/772,806 patent/US9893589B2/en active Active

Patent Citations (1)

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