DE202013012219U1 - Electric motor, in particular radiator fan motor - Google Patents

Abstract

Electric motor (10), in particular radiator fan motor of a motor vehicle, with a rotatably mounted relative to a stator (12) rotor (16), and with an electronics compartment (28) having motor carrier (26), and with an electronics compartment cover (32), wherein a Umrichterelektronik (30) arranged in the electronics compartment (28) and covered by the electronics compartment cover (32) which is connected to the motor carrier (26) by means of a latching hook (50) and a latching nose (48) comprising latching connection (46).

Description

The invention relates to an electric motor, in particular a brushless electric motor with an inner rotor, preferably a radiator fan motor of a motor vehicle.

Such an electric motor usually comprises a relative to a fixed stator or stator rotatably mounted rotor or rotor. In a brushless electric motor, the stator is often equipped with a rotating field winding, which is generated by the application of an alternating current, a magnetic rotating field. The arranged within the substantially hollow cylindrical stator rotor is usually equipped with permanent magnets which generate a rotor magnetic field interacting with the rotating field of the stator.

In a brushless electric motor, the alternating current provided for feeding the stator winding is usually generated by a converter (inverter). For smaller electric motors, this inverter is often included together with an associated control electronics in an electronics compartment, which is integrated into the motor housing. The control electronics is to protect against moisture, which is why in such, for example, used as a cooling fan motors in motor vehicles electric motors comparatively high demands are placed on the tightness of the electronics compartment.

The invention is therefore an object of the invention to provide an electric motor of the type mentioned, which is relatively easy to manufacture, and the electronics is suitably reliably sealed with the least possible effort, and to provide an arrangement that reliably sealed with the least possible effort.

With regard to the electric motor, the object is achieved by the features of claim 1 and in terms of the arrangement by the features of claim 10. Advantageous variants, refinements and developments are the subject of the dependent claims.

The electric motor, in particular part of a motor vehicle and z. B. is a radiator fan motor, has a stator and a rotor, wherein the rotor is rotatably mounted relative to the stator. Furthermore, the electric motor comprises a motor mount, which is connected in particular to the stator. The engine mount has an electronics compartment, within which a converter electronics is arranged. By means of the converter electronics, a coil arrangement of the stator is suitably energized in order to create a time-varying magnetic field. The electric motor is thus preferably brushless and designed, for example, in the manner of an internal rotor. In other words, the rotor is enclosed by the stator. The rotor itself expediently has a number of permanent magnets which, during operation of the electric motor, interact with the time-varying magnetic field generated by means of the stator and thus cause the rotor to rotate with respect to the stator.

The converter electronics has a number of electronic components, such as capacitors and / or semiconductor switches, wherein the semiconductor switches are connected in particular in the manner of a bridge circuit, in particular in a B6 circuit. The converter electronics are covered by an electronics compartment cover, which covers the electronics compartment and thus protects the converter electronics against environmental influences. In particular, the converter electronics by means of the electronics compartment cover and the electronics compartment is substantially air-tight and / or sealed splash-proof. Here, the electronics compartment cover of the inverter electronics z. B. spaced to allow air circulation within the electronics compartment. Alternatively, the converter electronics are applied to the electronics compartment lid to allow heat transfer from the converter electronics to the electronics compartment lid. In summary, the converter electronics between the engine mount and the electronics compartment cover is arranged.

The electronics compartment lid is connected by means of a latching connection to the motor carrier, wherein the latching connection has a latching hook and a latching nose. The electric motor expediently has a number of latching connections, in particular between 4 and 6 latching connections. To produce the locking connection of the latching hook is elastically deformed so that it engages behind the rigid latching lug. After a renewed bending of the latching hook in its original shape due to its elastic properties after removal of the latching hook in the desired position, the locking lug inhibits the further movement of the latching hook and thus prevents detachment of the electronics compartment cover from the motor mount.

Preferably, the electronics compartment lid is connected to the motor carrier without the use of further aids, for example screws. In other words, the connection between the electronics compartment cover and the engine mount is screwless. Due to the latching connection, also referred to as snap hook connection, a mounting of the electronics compartment cover to the motor carrier without the aid of further aids is possible. Consequently, an assembly of the electric motor is simplified.

Conveniently, the electronics compartment cover comprises a circumferential sealing groove, in which engages a corresponding edge of the electronics compartment. In this way, an increased tightness of the electronics compartment is given against external environmental influences. Conveniently, the sealing groove and / or the edge has at least one sealing ridge, by means of which the edge is pressed against a boundary of the sealing groove. As a result, there is a frictional connection between the edge and the sealing groove, wherein the force acts perpendicular to the course of the sealing groove. This further improves the sealing of the electronics compartment. In particular, the sealing groove is filled with a sealant. The sealing compound is expediently plastically deformable at least during assembly of the electric motor. For example, the sealant is a silicone. By means of the sealant any existing cavities between the sealing edge and the sealing groove are filled, which makes it difficult to penetrate a liquid in the electronics compartment.

In particular, the electronics compartment cover and / or the engine mount has at least one rib, which is shaped in the manner of a small plate. The rib is here in the assembled state either side of the outside of the sealing groove or one of the rib corresponding counter contour. By means of the rib and the counter contour or the sealing groove, a movement of the electronics compartment cover with respect to the motor carrier is prevented perpendicular to the course of the sealing groove. The rib is in the mounting state inside or outside the electronics compartment. Alternatively or in combination thereto, the electronics compartment cover and / or the engine mount comprises a rib which has a U-shaped cross-section. In the assembled state, the rib preferably surrounds a web and rests at least partially with the two mutually parallel legs on the web, which is part of the respective other component, ie the motor carrier or the electronics compartment lid. By means of the two mutually parallel legs of the rib and the web, a centering of the electronics compartment cover is thus achieved with respect to the motor carrier. In particular, a number of such ribs are present, which are distributed along the circumference of the sealing groove. In this way, the sealing web is centered with respect to the sealing groove, and a squeezing out of any existing sealing compound is prevented from the sealing groove.

Conveniently, the motor carrier is made of aluminum. In this way, the engine mount is relatively stable, the weight of the engine mount is comparatively low. Alternatively or in combination, the electronics compartment lid is made of a plastic which can be done relatively inexpensively. Particularly preferably, the motor carrier made of aluminum and the electronics compartment lid is made of a plastic, wherein the locking lug attached to the engine mount and in particular integrally formed on this and the latching hook attached to the electronics compartment lid, and in particular is molded. Consequently, the locking lug on a comparatively high rigidity, and it is possible to design the latching hook by means of a suitable choice of the plastic elastic.

For example, the latching hook has two mutually parallel mounting legs, which are each free end connected to a holding leg, so that the shape of the latching hook is substantially U-shaped. There is a latching tongue between the attachment legs, which is preferably elastically bendable with respect to the mounting legs. In particular, the latching tongue is elastically bent during assembly of the electronics compartment cover to the motor carrier. Conveniently, this is the locking tongue biased. In other words, the latching tongue is shaped such that during a mounting of the electronics compartment cover to the motor carrier, the latching tongue is deformed in comparison to the unmounted state.

In particular, in the mounted state, only the latching tongue bears on the latching lug. Consequently, the latching hook is only by means of the latching tongue in mechanical contact with the latching lug. For example, the latching tongue is connected to the holding leg and expediently integral with this. Particularly preferably, the mounting legs are integral with the retaining leg and the latching tongue, resulting in a relatively high stability of the latching hook. Conveniently, the latching tongue is parallel to the fastening legs, so that the composite of fastening legs, retaining legs and latching tongue is substantially W-shaped. In this way, the latching tongue is protected from any damage by means of the mounting legs.

In a preferred embodiment of the invention, the mounting legs are bent at their respective free end, which is the holding leg opposite, by 90 °. Here, the free ends are each oriented perpendicular to the holding leg. The orientation of the two free ends is preferably in the same direction, in particular, the cross section of the latching hook is perpendicular to the holding leg substantially L-shaped. In this way it is possible by means of the latching hook to engage around the latching lug, which is preferably oriented radially outward. In other words, the latching tongue is bent radially outward during assembly by means of the latching lug. In particular, the latching hook is the element of either the electronics compartment cover or the motor carrier, which has the largest radial distance. In other words, the limitation of the electronics compartment lid or of the engine mount formed by the latching hook which engages around the respective other part of the electric motor. In this way, on the one hand a review of the assembly is simplified and on the other hand prevented by means of the latching connection a radial displacement of the motor carrier with respect to the electronics compartment lid in at least one direction.

In an alternative embodiment of the invention, the free ends of the fastening legs are bent in such a way that the free ends are parallel to the retaining leg. The locking lug of the latching connection is in this case oriented in particular radially inward. By means of such an embodiment of the fastening legs, a comparatively space-saving and flush attachment of the latching hook is made possible. In interaction with a radially inwardly oriented locking lug thus the locking connection is offset from the peripheral side of the motor carrier and the electronics compartment cover radially inward, which protects the locking connection against any mechanical stress or damage.

Preferably, the latching hook is attached to the electronics compartment lid and in particular integrally with this. In this way, in case of damage to the latching hook or when canceling the latching hook only the electronics compartment lid must be replaced, and the motor carrier, which has a comparatively complex wiring can be used. In particular, the latching hook is at least partially disposed in the mounting state in a recess of the motor carrier, wherein the latching lug is expediently also positioned within the recess. In this way, the locking connection is protected against environmental influences and mechanical effects that could otherwise lead to damage to the latching connection. For example, the locking lug is attached or integrally formed on the engine mount. Preferably, the locking lug is made of the material of the motor carrier, which has a comparatively high stability. Consequently, the locking lug is also relatively robust, and it is possible to produce the locking connection comparatively quickly and without causing damage.

Particularly preferably, the locking lug on a latching surface on which the latching hook in the assembled state frictionally applied. The latching surface is oblique to the connecting direction of the latching connection. The connection direction is the direction in which the movement of the latching hook is inhibited in the assembled state by means of the latching lug. In particular, the connection direction is the direction in which the latching hook is moved with respect to the latching lug for mounting and producing the latching connection. Suitably, the latching tongue rests on the latching surface, provided that it is present. For example, the angle which the latching surface encloses with the connection direction is greater than 30 ° or greater than 40 °. Conveniently, the angle is less than 60 ° or 50 °. In particular, the angle is substantially 45 °.

By means of the inclination of the locking surface any manufacturing tolerances in the creation of the latching lug and / or the latching hook are compensated, whereby even with comparatively large deviations always a concern of the latching hook is ensured on the latching lug. Only the point of the system is changed. Due to the substantially play-free attachment of the engine mount to the electronics compartment lid displacement of a sealant from the sealing groove is prevented due to overpressing, provided that these components are present. In such a case, the sealing groove in interaction with the sealing edge prevents displacement of the motor carrier with respect to the electronics compartment lid due to the radial force transmitted by the latching surface perpendicular to the connecting direction. In summary, a tolerance compensation is created by means of the latching surface, wherein the latching hook is inhibited in the connecting direction. In particular, the radial extent of the latching lug increases in the connecting direction, wherein the latching surface extends in particular up to the radial end of the latching lug. During assembly, consequently, the latching hook is initially guided over the maximum radial extent of the latching lug and moved along the latching surface until an equilibrium of forces between the elastic deformation of the latching hook, in particular the latching tongue, if this is present, and a contact pressure is established.

Conveniently, the locking lug on a step which is arranged in the connecting direction behind the locking lug. In other words, during the assembly of the latching connection, the latching hook is first guided over the step and then along the latching surface. In particular, the step goes over into the locking surface. For example, the boundary surfaces of the step are parallel to the connection direction. By means of the stage, the robustness of the locking lug is increased. The cross section of the step perpendicular to the connection direction has a first edge which is parallel to the connection direction. Conveniently, the cross-section comprises a second edge which is perpendicular to the first edge. Consequently, the cross section of the step is L-shaped. The second edge is advantageously connected at its end facing away from the first edge with the latching surface.

The arrangement comprises a latching hook and a latching nose, which engage with each other in a connecting direction, and are thus connected to each other. The connection is in this case in particular a frictional connection, and the connection direction is the direction in which a movement of the latching hook due to the Latch is inhibited. The locking lug has a latching surface which extends obliquely with respect to the connecting direction. In other words, the latching surface is chamfered to the connecting direction. At the locking surface of the locking hook is non-positively. Due to the bevel is always guaranteed a concern of the latching hook on the latch without play even with manufacturing tolerances. If, for example, the length of the latching hook in the connecting direction is increased, then the latching hook still abuts against the latching lug, wherein, however, the contact surface changes in comparison to the normal position. However, there is no play between locking lug and latching hooks, as is the case in the absence of the beveled locking surface.

In particular, the latching hook is biased. In other words, the latching hook is made such that the latching hook by means of the locking lug, even with comparatively high manufacturing tolerances frictionally rests against the latching lug. If the latching hook has a latching tongue arranged between two mutually parallel fastening legs, the extent of the latching surface along the connecting direction is preferably greater than the distance between the latching tongue and the free ends of the fastening legs.

An embodiment of the invention will be explained in more detail with reference to a drawing. Show:

1 an exploded view of a radiator fan for a motor vehicle with a self-cooled, brushless internal rotor motor with motor mount and with integrated converter electronics,

2 in a perspective view overlooking a connection side of the engine according to 1 .

3 in plan view of the engine according to 1 with removed electronics compartment cover (housing cover),

4 in a perspective view of the motor carrier by means of a snap connection attached electronics compartment lid,

5a , b in perspective view and in sectional view a first embodiment of the latching connection, and

6a , b in perspective, a second embodiment of the latching connection.

Corresponding parts and sizes are always provided with the same reference numerals in all figures.

1 shows in disassembled state a fan 2 for the radiator of a motor vehicle. The fan 2 includes a fan 4 with a central cap 6 around its outer periphery (only slightly illustrated) air guide vanes 8th are arranged equally distributed. The fan 2 further includes an electric motor also referred to as a fan motor 10 , by means of which the fan wheel 4 is rotationally driven.

The motor 10 is essentially formed by a stator 12 that with a three-phase rotating field winding 14 is wound in the form of coils. The motor 10 further includes a permanently energized rotor 16 inside the stator 12 around a motor axis 18 is rotatably mounted. For storage of the rotor 16 includes the engine 10 two rolling bearings 20 and 22 , from axially opposite sides on the rotor 16 attack. The axial play of the rotor 16 between the two rolling bearings 20 and 22 is here by a spring washer 24 sprung.

The rotor 16 is (in a manner not shown) formed by a laminated core, are used in the permanent magnet for generating a field exciter, wherein the laminated core is molded together with the permanent magnet used with a plastic sheath. Similarly, the stator also exists 12 from a laminated core, which is encapsulated with a plastic sheath.

The motor 10 further includes an approximately disc-shaped engine mount 26 , which is made of aluminum and in particular formed by a one-piece die-cast aluminum. At one of the fan 4 opposite end face is in the engine mount 26 an electronics compartment 28 introduced into which a converter electronics 30 is used. For tight closure of the electronics compartment 28 includes the engine 10 a hereinafter also referred to as a housing cover electronics compartment lid 32 made of plastic, which is the inverter electronics 30 completely covers. The electronics compartment lid 16 is made as an injection molded plastic part.

At its front is the rotor 16 with four screw domes 36 provided by means of which the rotor 16 in the assembled state on the fan 4 is screwed. The fastening of the engine 10 and thus the entire fan 2 on the vehicle via the engine mount 26 , the purpose of this with three protruding from its outer circumference Schraublaschen 38 is provided. At the engine 10 it is a brushless self-cooled internal rotor or internal rotor motor.

Im in 2 shown, assembled state of the engine 10 is the stator 12 firmly on a front side of the engine mount 26 applied. The rotor 16 is in the plastic jacket 40 overmolded stator 12 used, the rotor 16 from both axial sides of each one of the two rolling bearings 20 and 22 flanked. The rolling bearings 20 and 22 are in this case not shown in a manner mounted on a pivot pin, which in turn on the engine mount 26 is attached.

3 shows the engine 10 with removed electronics compartment lid 32 with a view into the electronics compartment 28 with converter electronics arranged therein 30 , Led to this and contacted with this are supply lines (plus and minus or ground pole) 42a as well as sensor or data cables 42b a connection cable 42 , The electronics compartment 28 is of a circumferential, closed sealing or joining edge 44 enclosed.

In 4 is the perspective of the engine mount 26 by means of five locking connections 46 Tailored electronics compartment lid 32 shown. Every locking connection 46 each has a latch 48 and a latching hook 50 on, with four of the five locking hooks shown 50 each within a recess 52 of the engine mount 26 are arranged. All catch hooks 50 are here on the electronics compartment lid 32 and all locking lugs 48 on the engine mount 26 formed. Other lanyards that cover the electronics compartment 32 on the engine mount 26 fasten, are not present.

A first embodiment of the latching hook 50 is in 5a in perspective and in 5b in a sectional view parallel to a connecting direction 54 shown, with the connection direction 54 indicates the direction in which a movement of the latching hook 50 due to the catch 48 is inhibited. The latching hook 50 has two mutually parallel mounting legs 56 on, in the connection direction 54 run. At one of the free ends of the two equally long mounting legs 56 is a holding thigh 58 molded so that the shape of the latching hook 50 is essentially U-shaped. The remaining free ends 60 are bent by 90 ° so that they are perpendicular to the holding leg 58 as well as to the connection direction 54 run.

Between the two attachment legs 56 there is a catch tongue 62 which are essentially parallel to the connection direction 54 runs and on the holding leg 58 is formed. When installing the electronics compartment cover 32 on the engine mount 26 becomes the catch tongue 62 bent so that these are substantially parallel to the direction of connection 54 is. When unmounted, the tongue closes 62 with the connection direction 54 an angle other than 0 °. Consequently, a force acts between the latching tongue in the assembled state 62 and the latch 48 indicating the position of the electronics compartment cover 32 with respect to the engine mount 26 stabilized.

The catch 48 is oriented radially outward. In other words, the free end of the latch 48 further from the center of the engine mount 26 removed than that with other components of the engine mount 26 connected end of the latch 48 , The catch 48 has a level 64 and a catch area 66 on. The stage 64 is here in the connection direction 54 behind the locking surface 66 and both adjoin one another. The locking surface 66 is with respect to the connection direction 54 beveled. In other words, the locking surface closes 66 and the connection direction 54 an angle with each other, which is 45 °. Due to the beveling manufacturing tolerances in production of the individual components of the electric motor 10 balanced. For example, the catch tongue lies 62 in a shortened embodiment thereof in the connection direction 54 and radially inwardly offset on the latching surface 66 at. In an extended embodiment of the latching tongue 62 is the contact point opposite to the connection direction 54 offset radially outwards. The radial limit of the detent 48 in the area of the stage 54 however, it is essentially parallel to the direction of connection 54 ,

The electronics compartment lid 32 also has a circumferential sealing groove 68 on, in which the circumferential edge 44 of the engine mount 26 intervenes. The edge 44 circumferentially completely surrounds the electronics compartment 28 , A between the edge 44 and the sealing groove 68 remaining space is with a sealant 70 filled, for example, a silicone. Due to the sealing groove 68 , the edge 44 and the sealant 70 is the electronics compartment 28 protected against environmental influences and especially splash water. Additional to the electronics compartment lid 32 molded ribs 72 ( 4 ) cause a centering of the electronics compartment lid 32 with respect to the engine mount 26 so that the electronics compartment lid 32 despite the inclined locking surfaces 66 and the associated force perpendicular to the direction of connection 54 remains at the desired position even with different manufacturing tolerances.

In 6a and 6b is a perspective view of a second embodiment of the latching hook 50 once with and once against the direction of connection 54 shown, wherein the retaining leg 58 always in the connection direction 54 in front of the catch tongue 62 is arranged. The also on the electronics compartment lid 32 molded snap hooks 50 is different from the one in the 5a . 5b shown embodiment only in the embodiment of the free ends 60 , These are also bent by 90 °, but run parallel to the holding leg 58 with the two ends aligned opposite each other. The two ends 60 are with the electronics compartment lid 32 tethered. This embodiment of the latching hook 50 is comparatively space-saving, whereas by means of in 5a . 5b shown embodiment of the latching hook 50 the engine mount 26 is encompassed. The latching hook 50 is in the recess 52 arranged, by means of which the latching hook 50 is protected from damage. The catch 48 is oriented radially inwards. In other words, there is the catch 48 at the radially outer edge of the recess 52 and points towards the center of the engine mount 26 ,

The invention is not limited to the embodiments described above. Rather, other variants of the invention can be derived therefrom by the person skilled in the art without departing from the subject matter of the invention. In particular, all the individual features described in connection with the exemplary embodiments can also be combined with one another in other ways, without departing from the subject matter of the invention.

LIST OF REFERENCE NUMBERS

2

Fan

4

fan

6

cap

8th

air deflector

10

electric motor

12

stator

14

Rotary field winding

16

rotor

18

motor axis

20

roller bearing

22

roller bearing

24

spring washer

26

engine support

28

electronics

30

inverter electronics

32

Electronics compartment cover

36

screw boss

38

Schraublasche

40

Plastic sheath

42

connection cable

42a

supply line

42b

Sensor or data line

44

sealing edge

46

locking connection

48

locking lug

50

latch hook

52

recess

54

connection direction

56

fastening leg

58

holding leg

60

free end

62

catch tongue

64

step

66

Rest area

68

sealing groove

70

sealant

72

rib

Claims (10)

Electric motor ( 10 ), in particular radiator fan motor of a motor vehicle, with respect to a stator ( 12 ) rotatably mounted rotor ( 16 ), and with an electronics compartment ( 28 ) having engine mount ( 26 ), as well as with an electronics compartment lid ( 32 ), wherein a converter electronics ( 30 ) in the electronics compartment ( 28 ) and by means of the electronics compartment lid ( 32 ) which is attached to the engine mount ( 26 ) by means of a latching hook ( 50 ) and a catch ( 48 ) comprehensive locking connection ( 46 ) is attached. Electric motor ( 10 ) according to claim 1, characterized in that the electronics compartment lid ( 32 ) a circumferential sealing groove ( 68 ) into which a peripheral edge ( 44 ) of the electronics compartment ( 28 ) engages, wherein the sealing groove ( 68 ), in particular with a sealant ( 70 ) is filled. Electric motor ( 10 ) according to claim 1 or 2, characterized in that the engine mount ( 26 ) made of aluminum and / or the electronics compartment lid ( 32 ) is made of a plastic. Electric motor ( 10 ) according to one of claims 1 to 3, characterized in that the latching hook ( 50 ) U-shaped with two mutually parallel mounting legs ( 56 ) and an intermediate holding leg ( 58 ), wherein between the attachment legs ( 56 ) a latching tongue ( 62 ) is arranged, in particular on the holding leg ( 58 ) is attached. Electric motor ( 10 ) according to claim 4, characterized in that the fastening legs ( 56 ) are bent over at 90 ° on the free end, the free ends ( 60 ) each perpendicular to the holding leg ( 58 ), and wherein the detent ( 48 ) is oriented in particular radially outward. Electric motor ( 10 ) according to claim 4, characterized in that the fastening legs ( 56 ) are bent over at 90 ° on the free end, the free ends ( 60 ) each parallel to the holding leg ( 58 ), and wherein the detent ( 48 ) is oriented in particular radially inward. Electric motor ( 10 ) according to one of claims 1 to 6, characterized in that the latching hook ( 50 ) on the electronics compartment lid ( 32 ), and in particular at least partially within a recess ( 52 ) of the engine mount ( 26 ) is arranged. Electric motor ( 10 ) according to one of claims 1 to 7, characterized in that the latching lug ( 48 ) one to the connection direction ( 54 ) oblique locking surface ( 66 ), on which the latching hook ( 50 ) frictionally applied, wherein the angle between the connecting direction ( 54 ) and the locking surface ( 66 ) is in particular 45 °. Electric motor ( 10 ) according to claim 8, characterized in that the latching lug ( 48 ) a step ( 64 ), which in the connecting direction ( 54 ) behind the locking surface ( 66 ) is arranged. Arrangement with a latching hook ( 50 ) and with a catch ( 48 ) in a connection direction ( 54 ) are engaged with each other, wherein the detent ( 48 ) one to the connection direction ( 54 ) beveled catch surface ( 66 ), on which the latching hook ( 50 ) frictionally applied.

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