EP1851442A1 - Method for producing a mini fan and a mini fan produced according to said method - Google Patents

Method for producing a mini fan and a mini fan produced according to said method

Info

Publication number
EP1851442A1
EP1851442A1 EP05814941A EP05814941A EP1851442A1 EP 1851442 A1 EP1851442 A1 EP 1851442A1 EP 05814941 A EP05814941 A EP 05814941A EP 05814941 A EP05814941 A EP 05814941A EP 1851442 A1 EP1851442 A1 EP 1851442A1
Authority
EP
European Patent Office
Prior art keywords
fan
permanent magnet
plastic
support member
outer rotor
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.)
Granted
Application number
EP05814941A
Other languages
German (de)
French (fr)
Other versions
EP1851442B1 (en
Inventor
Rodica Peia
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.)
Ebm Papst St Georgen GmbH and Co KG
Original Assignee
Ebm Papst St Georgen GmbH and Co KG
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 Ebm Papst St Georgen GmbH and Co KG filed Critical Ebm Papst St Georgen GmbH and Co KG
Publication of EP1851442A1 publication Critical patent/EP1851442A1/en
Application granted granted Critical
Publication of EP1851442B1 publication Critical patent/EP1851442B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/02—Selection of particular materials
    • F04D29/023—Selection of particular materials especially adapted for elastic fluid pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D25/00—Pumping installations or systems
    • F04D25/02—Units comprising pumps and their driving means
    • F04D25/06—Units comprising pumps and their driving means the pump being electrically driven
    • F04D25/0606—Units comprising pumps and their driving means the pump being electrically driven the electric motor being specially adapted for integration in the pump
    • F04D25/0613—Units comprising pumps and their driving means the pump being electrically driven the electric motor being specially adapted for integration in the pump the electric motor being of the inside-out type, i.e. the rotor is arranged radially outside a central stator
    • F04D25/062—Details of the bearings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D25/00—Pumping installations or systems
    • F04D25/02—Units comprising pumps and their driving means
    • F04D25/06—Units comprising pumps and their driving means the pump being electrically driven
    • F04D25/0606—Units comprising pumps and their driving means the pump being electrically driven the electric motor being specially adapted for integration in the pump
    • F04D25/0613—Units comprising pumps and their driving means the pump being electrically driven the electric motor being specially adapted for integration in the pump the electric motor being of the inside-out type, i.e. the rotor is arranged radially outside a central stator
    • F04D25/064—Details of the rotor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D25/00—Pumping installations or systems
    • F04D25/02—Units comprising pumps and their driving means
    • F04D25/06—Units comprising pumps and their driving means the pump being electrically driven
    • F04D25/0606—Units comprising pumps and their driving means the pump being electrically driven the electric motor being specially adapted for integration in the pump
    • F04D25/0666—Units comprising pumps and their driving means the pump being electrically driven the electric motor being specially adapted for integration in the pump a sensor is integrated into the pump/motor design
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/60—Mounting; Assembling; Disassembling
    • F04D29/601—Mounting; Assembling; Disassembling specially adapted for elastic fluid pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2230/00—Manufacture
    • F05D2230/50—Building or constructing in particular ways
    • F05D2230/53—Building or constructing in particular ways by integrally manufacturing a component, e.g. by milling from a billet or one piece construction
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2300/00—Materials; Properties thereof
    • F05D2300/40—Organic materials
    • F05D2300/43—Synthetic polymers, e.g. plastics; Rubber
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2300/00—Materials; Properties thereof
    • F05D2300/50—Intrinsic material properties or characteristics
    • F05D2300/507—Magnetic properties
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2300/00—Materials; Properties thereof
    • F05D2300/60—Properties or characteristics given to material by treatment or manufacturing
    • F05D2300/603—Composites; e.g. fibre-reinforced
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49229—Prime mover or fluid pump making
    • Y10T29/49236—Fluid pump or compressor making
    • Y10T29/49245—Vane type or other rotary, e.g., fan

Definitions

  • the invention relates to a method for producing a mini-fan, and it relates to a mini-fan, which is obtainable by this method.
  • Such fans are also referred to as small or micro fan.
  • sensor fans are used for air measurement. These have e.g. an outer diameter of 30 mm, i. it is according to the technical usage of mini fans.
  • Such mini fans are also used to cool processors in computers, for example
  • the fans of the ebm-papst series 250 have dimensions of 8 x 25 x 25 mm, those of the ebm-papst series 400F dimensions of 10 x 40 x 40 mm, those of the ebm-papst series 400 of 20 x 40 x 40 mm, and the fans of the ebm-papst 600 series of 25 x 60 x 60 mm.
  • the power consumption of such fans is 0.4 ... 0.6 W for the 250 series, 0.7 to 0.9 W for the 400F series and 0.9 ... 3 for the 400 and 600 series , 4 W.
  • the weight is eg 5 g in the 250 series, 17 to 27 g in the 400 / 400F series, and 85 g in the 600 series.
  • the rotor shaft has z. B. often only the thickness of a knitting needle and can therefore be easily bent when carefree handling, causing the fan is unusable.
  • this object is achieved by a method according to claim 1 and a mini fan according to claim 3.
  • a method according to claim 1 manufactures the rotor in the two-component injection molding, it is very stable, because even the injected permanent magnet contributes to the stability of the fan, so that in a surprising way, the engine is very quiet.
  • the motors are of very high, consistent quality.
  • the miniaturization of such parts is greatly facilitated by this type of manufacture.
  • Fig. 1 is a partially sectioned illustration of a space
  • FIG. 2 shows a variant of FIG. 1,
  • Fig. 3 is an illustration of a contact pin with which the mini fan can be plugged onto a circuit board, said fastening part allows both an electrical and a mechanical connection of the fan to the circuit board
  • Fig. 4 is a section, taken along the line IV - IV of Fig. 3rd
  • Fig. 1 shows a mini-fan 10, which may in practice usually have a diameter of 30 to 35 mm, but is greatly enlarged for reasons of clarity. It has an outer housing 12 made of an insulating plastic, and this housing has at the top an air inlet opening 14 and laterally air outlet openings 16, of which in Fig. 1, only the rear is visible.
  • the housing 12 widens via an annular portion 18 to a cylindrical portion 20th
  • a circuit board 22 On the annular portion 18 is a circuit board 22, and on this a sealing ring 24 is attached from sponge rubber in the manner shown.
  • the circuit board 22 is substantially round and has in its center a transverse web 26, of which in Fig. 1, only the rear half is visible and on which an NTC resistor 28 is arranged, which serves as a temperature sensor for air, which in the direction of Arrows 30, 32 flows from above through the opening 14 and flows through the lateral opening 16.
  • the NTC resistor 28 is connected by tracks 34 with contact pins 36, 38 which are arranged in the cylindrical part 20 of the outer housing 12 in the manner shown.
  • These contact pins 36, 38 each have a bottom contacting foot 36 'and 38', each of which has two resilient elements 40, 42, which are shown in Fig. 4.
  • the Kunststofftechnischsfutee 36 'and 38' are inserted as shown in FIG. 3 and 4 in an opening 44 of a printed circuit board 46.
  • This opening 44 is connected to a metal layer 47, which extends through the opening 44 and is connected to a conductor track 48 of the printed circuit board 46.
  • the Kunststoff Industriessffinie 36 ', 38' so make electrical connections from the circuit board 46 to the fan 10 and its temperature sensor 28 ago.
  • the electronics for the commutation is not in the fan 10 itself, but on the associated circuit board 46. However, it is within the scope of the invention also possible, these components in the fan 10th to arrange yourself.
  • the cylindrical part 20 of the outer housing 12 is closed at the bottom by a circuit board 50, in the middle of a metal bushing 52 is arranged. This is surrounded by a cylindrical portion 54 which is integral with the circuit board 50 and which merges at its upper end in an annular disc 56, which forms a bobbin 57 for a stator winding 58 together with the parts 50 and 54.
  • the board 50 has notches 51 at its outer edge, through which the contact pins 36 and 38 and other contact pins 53 protrude.
  • the rotor 62 has a plastic support member 64 having in its center a hub 66 into which is injected the upper end of the shaft 60 which has a knurl 68 for better anchoring.
  • the outer rotor 62 has approximately the shape of an upside-down shell and has at its periphery a rim portion 70 which extends approximately parallel to the shaft 60.
  • a permanent magnet 72 is injected directly in the two-component injection molding process.
  • the magnet 72 contains hard ferrites in a matrix of plastic, and therefore this plastic with its Hartferritteilchen 74, which can be represented naturally only schematically, e.g. be injected as a ring in the support member 64, wherein the interfaces, which is symbolized by dotted lines 76, intimately connect by melting the plastics.
  • the magnet ring 72 is radially magnetized in a suitable device, as shown symbolically in FIG. 1 by the letters N (north pole) and S (south pole) in the usual way.
  • radially extending fan blades 80 are formed, that is, it is preferably a radial fan.
  • a radial fan Integral with the support member 64 radially extending fan blades 80 are formed, that is, it is preferably a radial fan.
  • the free end 82 of the shaft 60 forms a thrust bearing with the local portion 83 of the board 50, which is opposite to this end 82.
  • the end 82 of the shaft 60 is pressed down against the portion 83, and this is done by the magnetic ring 72 is offset relative to the cylindrical portions shown in Fig. 1, 84, 86 of a Klauenpolteils 88 in the axial direction. In this way, the magnetic ring 72 is pulled by an axial force F down.
  • Fig. 2 shows a variant of the invention.
  • the support member 64 ' here has an axial projection 90, and the magnetic ring 72' is injected during injection around this projection 90 around, so that there can be an even more intimate connection of the plastics.
  • many variants are possible here, e.g. Nubs, grooves, teeth, etc., to make the connection as good as possible.
  • the variant according to FIG. 1 is preferred because there the volume of the ring magnet 72 is greater than in FIG. 2, which improves the engine performance.

Abstract

A method is disclosed for producing a mini-fan that includes a fan wheel equipped with fan blades (80) and, in order to drive said fan wheel (64), an electric drive motor (61). The latter has an internal stator (90) and an external rotor (62). The latter has a supporting part (64) made of plastic and connected to a shaft (60), which part is implemented integrally with the fan blades (80). The external rotor (62) furthermore has at least one permanent magnet (72; 72′) having hard ferromagnetic particles (74). The plastic supporting part (64) is connected by plastic injection molding to the shaft (60), and by two-component injection molding to a plastic in which the hard ferromagnetic particles (74) of the rotor permanent magnet (72; 72′) are arranged, so that at least a portion of the transition zone (76) between the supporting part (64) and rotor permanent magnet (72; 72′) is formed by a materially engaging connection. The pre-assembled external rotor (62), thus formed, is inserted into the mini-fan.

Description

Verfahren zur Herstellung eines Minilüfters, und Minilüfter nach diesem Verfahren Method of making a mini-fan, and mini-fan by this method
Die Erfindung betrifft ein Verfahren zur Herstellung eines Minilüfters, und es betrifft einen Minilüfter, der nach diesem Verfahren erhältlich ist. Solche Lüfter werden auch als Klein- oder Kleinstlüfter bezeichnet.The invention relates to a method for producing a mini-fan, and it relates to a mini-fan, which is obtainable by this method. Such fans are also referred to as small or micro fan.
Zur Luftmessung, z.B. für Klimaanlagen in Kraftfahrzeugen, werden Sensorlüfter verwendet. Diese haben z.B. einen Außendurchmesser von 30 mm, d.h. es handelt sich nach dem technischen Sprachgebrauch um Minilüfter.For air measurement, e.g. For air conditioning in motor vehicles, sensor fans are used. These have e.g. an outer diameter of 30 mm, i. it is according to the technical usage of mini fans.
Derartige Minilüfter dienen auch zur Kühlung von Prozessoren in Computern, zurSuch mini fans are also used to cool processors in computers, for
Gerätekühlung bei kleinen Geräten, etc., und ihre Abmessungen sind sehr klein. Z.B. haben die Lüfter der ebm-papst-Serie 250 Abmessungen von 8 x 25 x 25 mm, die der ebm-papst-Serie 400F Abmessungen von 10 x 40 x 40 mm, die der ebm-papst-Serie 400 von 20 x 40 x 40 mm, und die Lüfter der ebm-papst-Serie 600 von 25 x 60 x 60 mm.Device cooling on small devices, etc., and their dimensions are very small. For example, the fans of the ebm-papst series 250 have dimensions of 8 x 25 x 25 mm, those of the ebm-papst series 400F dimensions of 10 x 40 x 40 mm, those of the ebm-papst series 400 of 20 x 40 x 40 mm, and the fans of the ebm-papst 600 series of 25 x 60 x 60 mm.
Die Leistungsaufnahme solcher Lüfter liegt bei der Serie 250 bei 0,4 ... 0,6 W, bei der Serie 400F bei 0,7 bis 0,9 W, und bei der Serie 400 und 600 bei 0,9 ... 3,4 W. Das Gewicht beträgt z.B. bei der Serie 250 etwa 5 g, bei der Serie 400/400F zwischen 17 und 27 g, und bei der Serie 600 etwa 85 g.The power consumption of such fans is 0.4 ... 0.6 W for the 250 series, 0.7 to 0.9 W for the 400F series and 0.9 ... 3 for the 400 and 600 series , 4 W. The weight is eg 5 g in the 250 series, 17 to 27 g in the 400 / 400F series, and 85 g in the 600 series.
Bei Lüftern dieser Miniaturgröße die sehr preiswert sein müssen, ist es wichtig, Herstellung und Montage äußerst einfach zu machen, damit ein hoher Automatisierungsgrad möglich wird und man eine gleichmäßige, hohe Qualität und Geräuscharmut solcher Lüfter erhält.With fans of this miniature size that must be very inexpensive, it is important to make manufacturing and assembly extremely easy, so that a high degree of automation is possible and you get a uniform, high quality and low noise of such fans.
Bei solchen extrem kleinen Lüftern kommt erschwerend hinzu, dass ihre Bauteile, durchaus vergleichbar mit denen eines mechanischen Uhrwerks, sehr zierlich und deshalb wenig robust sind. Die Rotorwelle hat z. B. oft nur die Dicke einer Stricknadel und kann deshalb bei sorglosem Umgang leicht verbogen werden, wodurch der Lüfter unbrauchbar wird.In such extremely small fans is aggravating added that their components, quite comparable to those of a mechanical movement, very delicate and Therefore, they are not very robust. The rotor shaft has z. B. often only the thickness of a knitting needle and can therefore be easily bent when carefree handling, causing the fan is unusable.
Es ist deshalb eine Aufgabe der Erfindung, ein neues Verfahren zur Herstellung eines Minilüfters und einen Minilüfter nach diesem Verfahren, bereit zu stellen.It is therefore an object of the invention to provide a new method for manufacturing a mini-fan and a mini-fan according to this method.
Nach der Erfindung wird diese Aufgabe gelöst durch ein Verfahren gemäß Patentanspruch 1 und einen Minilüfter gemäß Patentanspruch 3. Dadurch, dass man den Rotor im Zweikomponenten-Spritzguss herstellt, wird er sehr stabil, weil auch der eingespritzte Dauermagnet zur Stabilität des Lüfterrads beiträgt, so dass in überraschender weise der Motorlauf sehr ruhig wird. Ferner gibt es keinen Ausschluss wegen falscher Montage oder wegen unerwünschter Geräusche, da durch diese Art der Herstellung die Motoren von sehr hoher, gleich bleibender Qualität sind. Außerdem wird die Miniaturisierung solcher Teile durch diese Art der Herstellung sehr erleichtert.According to the invention, this object is achieved by a method according to claim 1 and a mini fan according to claim 3. The fact that one manufactures the rotor in the two-component injection molding, it is very stable, because even the injected permanent magnet contributes to the stability of the fan, so that in a surprising way, the engine is very quiet. Furthermore, there is no exclusion due to improper mounting or because of unwanted noise, since this type of production, the motors are of very high, consistent quality. In addition, the miniaturization of such parts is greatly facilitated by this type of manufacture.
Weitere Einzelheiten und vorteilhafte Weiterbildungen der Erfindung ergeben sich aus den im folgenden beschriebenen und in der Zeichnung dargestellten, in keiner Weise als Einschränkung der Erfindung zu verstehenden Ausführungsbeispieien, sowie aus den Unteransprüchen. Es zeigt:Further details and advantageous developments of the invention will become apparent from the hereinafter described and illustrated in the drawing, in no way as a limitation of the invention to be understood Ausführungsbeispieien, and from the dependent claims. It shows:
Fig. 1 eine teilweise im Schnitt dargestellte raumbildliche Darstellung einesFig. 1 is a partially sectioned illustration of a space
Minilüfters nach einem bevorzugten Ausführungsbeispiel der Erfindung, in sehr stark vergrößerter Darstellungsweise,Mini fans according to a preferred embodiment of the invention, in a very greatly enlarged representation,
Fig. 2 eine Variante zu Fig. 1 ,2 shows a variant of FIG. 1,
Fig. 3 eine Darstellung eines Kontaktstiftes, mit welchem der Minilüfter auf eine Leiterplatte aufgesteckt werden kann, wobei dieses Befestigungsteil sowohl eine elektrische wie eine mechanische Verbindung des Lüfters mit der Leiterplatte ermöglicht, und Fig. 4 einen Schnitt, gesehen längs der Linie IV - IV der Fig. 3.Fig. 3 is an illustration of a contact pin with which the mini fan can be plugged onto a circuit board, said fastening part allows both an electrical and a mechanical connection of the fan to the circuit board, and Fig. 4 is a section, taken along the line IV - IV of Fig. 3rd
Fig. 1 zeigt einen Minilüfter 10, der in der Praxis gewöhnlich einen Durchmesser von 30 bis 35 mm haben kann, aber aus Gründen der Anschaulichkeit stark vergrößert dargestellt ist. Er hat ein Außengehäuse 12 aus einem isolierenden Kunststoff, und dieses Gehäuse hat oben eine Lufteintrittsöffnung 14 und seitlich Luftaustrittsöffnungen 16, von denen in Fig. 1 nur die hintere sichtbar ist.Fig. 1 shows a mini-fan 10, which may in practice usually have a diameter of 30 to 35 mm, but is greatly enlarged for reasons of clarity. It has an outer housing 12 made of an insulating plastic, and this housing has at the top an air inlet opening 14 and laterally air outlet openings 16, of which in Fig. 1, only the rear is visible.
Ausgehend von der Lufteintrittsöffnung 14 erweitert sich das Gehäuse 12 über einen ringförmigen Abschnitt 18 zu einem zylindrischen Abschnitt 20.Starting from the air inlet opening 14, the housing 12 widens via an annular portion 18 to a cylindrical portion 20th
Auf dem ringförmigen Abschnitt 18 liegt eine Leiterplatte 22 auf, und auf dieser ist ein Dichtring 24 aus Moosgummi in der dargestellten Weise befestigt.On the annular portion 18 is a circuit board 22, and on this a sealing ring 24 is attached from sponge rubber in the manner shown.
Die Leiterplatte 22 ist im wesentlichen rund und hat in ihrer Mitte einen Quersteg 26, von dem in Fig. 1 nur die hintere Hälfte sichtbar ist und auf dem ein NTC- Widerstand 28 angeordnet ist, der als Temperatursensor für Luft dient, welche in Richtung von Pfeilen 30, 32 von oben durch die Öffnung 14 einströmt und durch die seitliche Öffnung 16 abströmt.The circuit board 22 is substantially round and has in its center a transverse web 26, of which in Fig. 1, only the rear half is visible and on which an NTC resistor 28 is arranged, which serves as a temperature sensor for air, which in the direction of Arrows 30, 32 flows from above through the opening 14 and flows through the lateral opening 16.
Der NTC-Widerstand 28 ist durch Leiterbahnen 34 mit Kontaktstiften 36, 38 verbunden, die im zylindrischen Teil 20 des Außengehäuses 12 in der dargestellten Weise angeordnet sind. Diese Kontaktstifte 36, 38 haben unten jeweils einen Kontaktierungsfuß 36' bzw. 38', von denen jeder zwei federnde Elemente 40, 42 hat, die in Fig. 4 dargestellt sind. Die Kontaktierungsfüße 36' bzw. 38' werden gemäß Fig. 3 und 4 in eine Öffnung 44 einer Leiterplatte 46 gesteckt. Diese Öffnung 44 ist mit einer Metallschicht 47 verbunden, die sich durch die Öffnung 44 erstreckt und mit einer Leiterbahn 48 der Leiterplatte 46 verbunden ist. Die Kontaktierungsfüße 36', 38' stellen also elektrische Verbindungen von der Leiterplatte 46 zum Lüfter 10 bzw. dessen Temperatursensor 28 her. Besonders bei sehr kleinen Lüftern ist es denkbar, dass sich die Elektronik für die Kommutierung nicht im Lüfter 10 selbst befindet, sondern auf der zugehörigen Leiterplatte 46. Jedoch ist es im Rahmen der Erfindung auch möglich, diese Bauteile im Lüfter 10 selbst anzuordnen.The NTC resistor 28 is connected by tracks 34 with contact pins 36, 38 which are arranged in the cylindrical part 20 of the outer housing 12 in the manner shown. These contact pins 36, 38 each have a bottom contacting foot 36 'and 38', each of which has two resilient elements 40, 42, which are shown in Fig. 4. The Kontaktierungsfüße 36 'and 38' are inserted as shown in FIG. 3 and 4 in an opening 44 of a printed circuit board 46. This opening 44 is connected to a metal layer 47, which extends through the opening 44 and is connected to a conductor track 48 of the printed circuit board 46. The Kontaktierungsfüße 36 ', 38' so make electrical connections from the circuit board 46 to the fan 10 and its temperature sensor 28 ago. Especially with very small fans, it is conceivable that the electronics for the commutation is not in the fan 10 itself, but on the associated circuit board 46. However, it is within the scope of the invention also possible, these components in the fan 10th to arrange yourself.
Der zylindrische Teil 20 des Außengehäuses 12 wird nach unten abgeschlossen durch eine Platine 50, in deren Mitte eine Metallbuchse 52 angeordnet ist. Diese wird umgeben von einem zylindrischen Abschnitt 54, der mit der Platine 50 einstückig ist und der an seinem oberen Ende in eine Ringscheibe 56 übergeht, welche zusammen mit den Teilen 50 und 54 einen Spulenkörper 57 für eine Statorwicklung 58 bildet. Die Platine 50 hat an ihrem Außenrand Einkerbungen 51 , durch welche die Kontaktstifte 36 und 38 sowie andere Kontaktstifte 53 ragen.The cylindrical part 20 of the outer housing 12 is closed at the bottom by a circuit board 50, in the middle of a metal bushing 52 is arranged. This is surrounded by a cylindrical portion 54 which is integral with the circuit board 50 and which merges at its upper end in an annular disc 56, which forms a bobbin 57 for a stator winding 58 together with the parts 50 and 54. The board 50 has notches 51 at its outer edge, through which the contact pins 36 and 38 and other contact pins 53 protrude.
Innerhalb der Buchse 52 befindet sich ein (nicht dargestelltes) Sinterlager für die Welle 60 des Außenrotors 62 eines Elektromotors 61 . Der Rotor 62 hat ein Trageteil 64 aus Kunststoff, das in seiner Mitte eine Nabe 66 hat, in welche das obere Ende der Welle 60 eingespritzt ist, das zwecks besserer Verankerung eine Rändelung 68 hat. Der Außenrotor 62 hat etwa die Form einer auf dem Kopf stehenden Schale und hat an seiner Peripherie einen Randabschnitt 70, der etwa parallel zur Welle 60 verläuft.Inside the bushing 52 is a sintered bearing (not shown) for the shaft 60 of the outer rotor 62 of an electric motor 61. The rotor 62 has a plastic support member 64 having in its center a hub 66 into which is injected the upper end of the shaft 60 which has a knurl 68 for better anchoring. The outer rotor 62 has approximately the shape of an upside-down shell and has at its periphery a rim portion 70 which extends approximately parallel to the shaft 60.
Wie dargestellt, ist in diesem Randabschnitt 70 ein Permanentmagnet 72 im Zweikomponenten-Spritzverfahren direkt eingespritzt. Der Magnet 72 enthält Hartferrite in einer Matrix aus Kunststoff, und deshalb kann dieser Kunststoff mit seinen Hartferritteilchen 74, die naturgemäß nur schematisch dargestellt werden können, z.B. als Ring in das Trägerteil 64 eingespritzt werden, wobei sich die Grenzflächen, welche durch strichpunktierte Linien 76 symbolisiert ist, durch Anschmelzen der Kunststoffe innig verbinden.As shown, in this edge portion 70, a permanent magnet 72 is injected directly in the two-component injection molding process. The magnet 72 contains hard ferrites in a matrix of plastic, and therefore this plastic with its Hartferritteilchen 74, which can be represented naturally only schematically, e.g. be injected as a ring in the support member 64, wherein the interfaces, which is symbolized by dotted lines 76, intimately connect by melting the plastics.
Anschließend an das Einspritzen des Magnetrings 72 wird dieser in einer geeigneten Vorrichtung radial magnetisiert, wie das in Fig. 1 durch die Buchstaben N (Nordpol) und S (Südpol) in der üblichen Weise symbolisch dargestellt ist.Subsequent to the injection of the magnet ring 72, it is radially magnetized in a suitable device, as shown symbolically in FIG. 1 by the letters N (north pole) and S (south pole) in the usual way.
Einstückig mit dem Trägerteil 64 sind radial verlaufende Lüfterflügel 80 ausgebildet, d.h. es handelt sich bevorzugt um einen Radiallüfter. Von großem Vorteil bei der Erfindung ist, dass bei dieser Art der Herstellung der Außenrotor 62 nach dem Einspritzen der Kunststoffe bereits weitgehend ausgewuchtet ist, so dass allenfalls noch kleinere Wuchtarbeiten notwendig werden. Auch ergibt sich eine Einsparung bei der Montage, da gerade solche extrem kleinen Teile schwierig zu handhaben und zu montieren sind, und da deshalb bei der Montage leicht Fehler auftreten könnten. Durch die Erfindung vermeidet man Ausschuss, da der Rotor mit seinem Rotormagnet bei der Montage als fertiges und geprüftes Teil vorliegt, das nur noch im Lager montiert werden muss, was gewöhnlich durch Einstecken der Welle in das Lager geschieht.Integral with the support member 64 radially extending fan blades 80 are formed, that is, it is preferably a radial fan. Of great advantage in the invention is that in this type of production of the outer rotor 62 is already largely balanced after the injection of plastics, so that at most even smaller balancing work will be necessary. Also, there is a saving in assembly, since just such extremely small parts are difficult to handle and assemble, and therefore could easily occur during assembly errors. The invention avoids rejects, since the rotor is present with its rotor magnet during assembly as a finished and tested part that only needs to be mounted in the camp, which usually happens by inserting the shaft in the camp.
Bei dem Lüfter gemäß Fig. 1 bildet das freie Ende 82 der Welle 60 ein Axiallager mit dem dortigen Abschnitt 83 der Platine 50, der diesem Ende 82 gegenüber liegt. Dabei wird das Ende 82 der Welle 60 nach unten gegen den Abschnitt 83 gepresst, und dies geschieht dadurch, dass der Magnetring 72 relativ zu den in Fig. 1 dargestellten zylindrischen Abschnitten 84, 86 eines Klauenpolteils 88 in axialer Richtung versetzt ist. Auf diese Weise wird der Magnetring 72 durch eine axiale Kraft F nach unten gezogen.In the fan of FIG. 1, the free end 82 of the shaft 60 forms a thrust bearing with the local portion 83 of the board 50, which is opposite to this end 82. In this case, the end 82 of the shaft 60 is pressed down against the portion 83, and this is done by the magnetic ring 72 is offset relative to the cylindrical portions shown in Fig. 1, 84, 86 of a Klauenpolteils 88 in the axial direction. In this way, the magnetic ring 72 is pulled by an axial force F down.
Fig. 2 zeigt eine Variante der Erfindung. Das Trägerteil 64' hat hier einen axialen Vorsprung 90, und der Magnetring 72' wird beim Einspritzen um diesen Vorsprung 90 herum gespritzt, so dass dort eine noch innigere Verbindung der Kunststoffe erfolgen kann. Naturgemäß sind hier viele Varianten möglich, z.B. Noppen, Rillen, Zähne etc., um die Verbindung möglichst gut zu machen. Jedoch wird die Variante nach Fig. 1 bevorzugt, da dort das Volumen des Ringmagnets 72 größer ist als bei Fig. 2, was die Motorleistung verbessert.Fig. 2 shows a variant of the invention. The support member 64 'here has an axial projection 90, and the magnetic ring 72' is injected during injection around this projection 90 around, so that there can be an even more intimate connection of the plastics. Naturally, many variants are possible here, e.g. Nubs, grooves, teeth, etc., to make the connection as good as possible. However, the variant according to FIG. 1 is preferred because there the volume of the ring magnet 72 is greater than in FIG. 2, which improves the engine performance.
Naturgemäß sind im Rahmen der vorliegenden Erfindung vielfache Abwandlungen und Modifikationen möglich. Naturally, many modifications and modifications are possible within the scope of the present invention.

Claims

Patentansprüche claims
1. Verfahren zur Herstellung eines Minilüfters, welcher ein mit Lüfterflügeln (80) versehenes Lüfterrad und einen elektrischen Antriebsmotor (61) zum Antrieb dieses Lüfterrads aufweist, welcher Antriebsmotor (61) einen Innenstator (90) und einen Außenrotor (62) aufweist, welch letzterer ein mit einer Welle (60) verbundenes Trageteil (64) aus Kunststoff aufweist, das einstückig mit den Lüfterflügeln (80) ausgebildet ist, und welcher Außenrotor (62) ferner mindestens einen Dauermagneten (72; 72') mit hartferromagnetischen Partikeln (74) aufweist, mit folgenden Schritten:1. A method for producing a mini fan, which has a fan blades (80) provided fan and an electric drive motor (61) for driving this fan, which drive motor (61) has an inner stator (90) and an outer rotor (62), which latter a plastic support member (64) connected to a shaft (60) integrally formed with the fan blades (80), and which outer rotor (62) further comprises at least one permanent magnet (72; 72 ') having hard ferromagnetic particles (74) , with the following steps:
Das Kunststoff-Trageteil (64) wird durch Kunststoff-Spritzguss mit der Welle (60) und durch Zweikomponenten-Spritzguss mit einem Kunststoff verbunden, in dem die hartferromagnetischen Partikel (74) des Rotor-Dauermagneten (72; 72') angeordnet sind, so dass mindestens ein Teil der Übergangszone (76) zwischen Trageteil (64) und Rotor-Dauermagnet (72; 72') durch eine stoffschlüssige Verbindung gebildet wird; der so gebildete Außenrotor (62) wird im Minilüfter montiert.The plastic support member (64) is connected by plastic injection molding with the shaft (60) and by two-component injection molding with a plastic in which the hartferromagnetischen particles (74) of the rotor permanent magnet (72; 72 ') are arranged so that at least part of the transition zone (76) between the support member (64) and the rotor permanent magnet (72, 72 ') is formed by a material connection; The outer rotor (62) thus formed is mounted in the mini-fan.
2. Verfahren nach Anspruch 1, bei welchem gleichzeitig mit dem Trageteil (64) Lüfterflügel (80) durch Kunststoff-Spritzguss erzeugt werden, welche mit dem Trageteil (64) einstückig ausgebildet sind.2. The method of claim 1, wherein simultaneously with the support member (64) fan blades (80) are produced by plastic injection molding, which are integrally formed with the support member (64).
3. Minilüfter, welcher ein mit Lüfterflügeln (80) versehenen Lüfterrad und einen elektrischen Antriebsmotor (61) zum Antrieb dieses Lüfterrades aufweist, welcher Antriebmotor (61) einen Innenstator (90) und einen Außenrotor (62) aufweist, welch letzterer ein mit einer Welle (60) verbundenes Trageteil (64) aus Kunststoff aufweist, das einstückig mit den Lüfterflügeln (80) ausgebildet ist, welcher Außenrotor (62 ferner mindestens einen Dauermagneten (72; 72') mit hartferromagnetischen Partikeln (74) aufweist, welche Partikel in einer Matrix aus einem spritzgussfähigen Kunststoff angeordnet sind, welcher Dauermagnet (72; 72') als Spritzgussteil am Trageteil (64) angespritzt ist, wobei mindestens ein Teil der Übergangszone (76) zwischen Trageteil und Dauermagnet (72; 72') durch Anschmelzen von benachbarten Kunststoffen als stoff schlüssige Verbindung ausgebildet ist.3. Mini fan, which has a fan blades (80) provided fan wheel and an electric drive motor (61) for driving this fan wheel, which drive motor (61) has an inner stator (90) and an outer rotor (62), which latter one with a shaft (60) comprises a plastic support member (64) integrally formed with said fan blades (80), said outer rotor (62) further comprising at least one permanent magnet (72; 72 ') having hard ferromagnetic particles (74) which particles in a matrix are arranged from an injection-moldable plastic, which permanent magnet (72, 72 ') is molded on the support part (64) as an injection-molded part, wherein at least a part of the transition zone (76) between the support member and the permanent magnet (72, 72 ') is formed by melting of adjacent plastics as a material-coherent connection.
4. Minilüfter nach Anspruch 3, bei welchem zwischen Trageteil (64) und Dauermagnet (72; 72') eine mechanische Verzahnung (90) vorgesehen ist.4. miniature fan according to claim 3, wherein between the support member (64) and permanent magnet (72, 72 '), a mechanical toothing (90) is provided.
5. Minilüfter nach Anspruch 3 oder 4, welcher als Sensorlüfter ausgebildet ist und einen Temperatursensor (28) aufweist.5. mini fan according to claim 3 or 4, which is designed as a sensor fan and a temperature sensor (28).
6. Minilüfter nach einem der Ansprüche 3 bis 5, bei welchem zwischen dem Außenrotor (62) und dem Innenstator (90) ein Axiallager (82, 83) vorgesehen ist, und der Dauermagnet (72; 72') des Außenrotors (62) gegenüber weichferromagnetischen Teilen (84, 86) des Innenstators (90) axial versetzt ist, um eine zwischen Innenstator (90) und Außenrotor (62) wirkende Magnetkraft (F) zu bewirken, welche in Richtung zu diesem Axiallager (82, 83) wirksam ist. A miniature fan according to any one of claims 3 to 5, wherein a thrust bearing (82, 83) is provided between the outer rotor (62) and the inner stator (90), and the permanent magnet (72, 72 ') faces the outer rotor (62) soft ferromagnetic portions (84, 86) of the inner stator (90) is axially displaced to effect a magnetic force (F) acting between the inner stator (90) and outer rotor (62), which is effective toward this thrust bearing (82, 83).
EP05814941A 2005-02-24 2005-12-10 Method for producing a mini fan and a mini fan produced according to said method Not-in-force EP1851442B1 (en)

Applications Claiming Priority (2)

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DE202005003413U DE202005003413U1 (en) 2005-02-24 2005-02-24 Mini fan
PCT/EP2005/013260 WO2006089577A1 (en) 2005-02-24 2005-12-10 Method for producing a mini fan and a mini fan produced according to said method

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EP1851442A1 true EP1851442A1 (en) 2007-11-07
EP1851442B1 EP1851442B1 (en) 2009-04-15

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EP (1) EP1851442B1 (en)
JP (1) JP4866865B2 (en)
AT (1) ATE428859T1 (en)
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WO (1) WO2006089577A1 (en)

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WO2006089577A1 (en) 2006-08-31
DE502005007113D1 (en) 2009-05-28
US8727746B2 (en) 2014-05-20
DE202005003413U1 (en) 2006-07-13
EP1851442B1 (en) 2009-04-15
US20090232677A1 (en) 2009-09-17
JP2008531905A (en) 2008-08-14
ATE428859T1 (en) 2009-05-15
JP4866865B2 (en) 2012-02-01

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