Electric motor

Abstract

The invention relates to an electric motor, in particular for a radiator fan. The invention relates to an electric motor having a motor carrier with an electronics compartment for motor electronics, the electronics compartment having an electronics compartment base and a side wall that is upright in the height direction relative to the electronics compartment base. Furthermore, the electric motor has an electronics compartment cover for closing the electronics compartment, the electronics compartment cover having an in particular slot-like receptacle for the free end of the side wall, the receptacle having an outer wall arranged on the outer side of the side wall, and the tongue extending from the outer wall, in particular from the free end of the outer wall, against the height direction, and the convex tongue is provided with a convex tongue base section and a clamping element which is arranged on the convex tongue base section and is used for forming a clamping connection part with the clamping convex nose of the motor carrier.

Description

Technical Field

[0001] The invention relates to an electric motor having a motor carrier with an electronics compartment for motor electronics and having an electronics compartment cover for closing the electronics compartment. Background Art

[0002] For example, DE 10 2018 200 598 A1 discloses an electric motor whose stator is fastened to a motor carrier. In addition, the motor carrier has an electronics compartment for motor electronics on its side facing away from the stator, wherein the electronics compartment is covered by an electronics compartment cover in the assembled state.

[0003] In such electric motors, the electronics compartment cover is typically glued to the free ends of the side walls of the electronics compartment.

[0004] The electronics compartment cover should be secured in order to prevent uncontrolled sliding of the electronics compartment cover relative to the side wall during assembly, in particular also when the electronics compartment cover is glued to the side wall. Summary of the invention

[0005] The object of the present invention is to specify an electric motor in which a particularly suitable fixing of the electronics compartment cover to the motor carrier is achieved. The fixing should be carried out in a manner that saves as much space and / or material as possible.

[0006] This object is achieved according to the invention by an electric motor having the features of claim 1. Advantageous embodiments and developments of the invention are the subject matter of the dependent claims.

[0007] The electric motor is particularly provided and configured for a radiator fan. For example, the electric motor is provided and configured for rotationally driving a fan wheel.

[0008] The electric motor comprises a motor carrier. The stator of the electric motor and / or the bearing of the rotor shaft for the rotor of the electric motor are preferably fastened to the motor carrier. For example, the motor carrier is arranged above the stator and the rotor in the axial direction, i.e. in the direction of the axis of rotation of the rotor. The stator expediently has a plurality of coils which are interconnected with one another, for example, in a star circuit or a delta circuit.

[0009] The electric motor expediently comprises motor electronics. For example, the motor electronics is configured to energize the coils of the stator for generating the rotating field. To this end, the motor electronics comprises a bridge circuit electrically connected to the coils of the stator.

[0010] The motor carrier has an electronics compartment for the motor electronics. In other words, the electronics compartment forms a storage space for the motor electronics. For this purpose, the electronics compartment has an electronics compartment bottom and side walls that stand in the height direction, in particular in the axial direction, relative to the electronics compartment bottom, in particular perpendicular to the electronics compartment bottom. Preferably, the motor carrier is integrally formed, i.e. in one piece, so that the side walls are formed onto the electronics compartment bottom.

[0011] The electric motor also comprises an electronics compartment cover for covering, in particular closing, the electronics compartment. The electronics compartment cover, also referred to below as the cover, has a receptacle for the free end, i.e. for the end of the side wall facing away from the electronics compartment bottom. Thus, in the assembled state, the free end of the side wall is arranged in the receptacle, wherein an adhesive is preferably introduced into the receptacle for joining the cover to the side wall.

[0012] The electronics compartment cover is expediently formed from an aluminum-magnesium alloy, in particular from EN AW 5754. The electronics compartment cover is therefore particularly corrosion-resistant. Furthermore, the electronics compartment cover made from this material is relatively resistant to bending.

[0013] The receiving portion is preferably configured as a groove. Therefore, the receiving portion comprises a substantially U-shaped cross section, wherein, in the assembled state, the free end of the side wall and / or the adhesive is received in the region between two parallel U sides of the U shape.

[0014] Preferably, the receiving portion extends along the circumference of the cover, in particular along the entire circumference.

[0015] The receiving portion has an outer wall, which is arranged outside the side wall of the electronic device compartment. Therefore, the outer wall is arranged outside the receiving space surrounded by the side wall. For example, the outer wall is substantially parallel to the side wall at least in the area of ​​its free end, that is, in the area of ​​the lower end with respect to the height direction. If the receiving portion is configured as a groove, the outer wall is formed by the following U side, that is, by the groove wall arranged outside the side wall.

[0016] A tongue extends from the outer wall of the receiving part of the electronics compartment cover, in particular from the free end of the outer wall, in other words from the lower end of the outer wall with respect to the height direction, in other words from the edge of the outer wall, counter to the height direction. In particular, the tongue is integrally formed on the outer wall. In general, the tongue protrudes in the opposite direction of the height relative to the edge of the outer wall.

[0017] Suitably, the tongue forms a continuation of the outer wall and / or has the same thickness as the outer wall.

[0018] Again, the tongue has a preferably flat (tongue) base section and a snap-in element arranged on the base section, in particular protruding from the base section. The snap-in element is hereby provided for forming a snap-in connection with a snap-in nose (locking nose) of the motor carrier. In the assembled state, the snap-in element engages the snap-in nose of the motor carrier from behind to form the snap-in connection. For example, in the assembled state, the snap-in element is arranged below the snap-in nose with respect to the height direction, while the outer wall is arranged above the snap-in nose. In summary, the tongue base section forms a snap-in arm, while the snap-in element forms a locking element for the snap-in connection.

[0019] Advantageously, when assembling the electric motor, a particularly easy-to-establish fastening of the electronics compartment cover to the motor carrier is achieved by means of such a snap connection. Here, a tongue protruding from the outer wall and engaging behind a snap-on nose of the motor carrier is a particularly advantageous design of a space-saving and material-saving snap-on connection.

[0020] According to a particularly suitable design, the tongue has a U-shaped inner seam. In other words, the tongue has a U-shaped gap, which extends completely within the surface opened by the tongue, that is, does not extend to the edge of the tongue. In other words, the gap start point and the gap end point are arranged inside the tongue. The inner seam is continuous in a direction perpendicular to the surface opened by the tongue. It is particularly preferred that the U shape is open in a direction opposite to the height direction. In other words, two parallel U sides (vertical sides) extend in the height direction, wherein the U connecting side (horizontal side) connecting the two parallel U sides is arranged at the upper end of the parallel U sides with respect to the height direction.

[0021] The section of the tongue surrounded by the inner seam, i.e. enclosed, is inclined at a first inclination angle toward the side wall, or alternatively away from the side wall, so that the enclosed section forms a snap element. Thus, the section of the tongue arranged between the parallel U-shaped sides of the inner seam in the direction of the edge along the outer wall forms a snap element.

[0022] In other words, the tongue base section forms an in particular flat frame which comprises a rectangular recess, wherein the latching element is preferably formed on a side delimiting the recess downwardly with respect to the height direction and extends obliquely from this side relative to the frame.

[0023] In other words, it is preferred that the lower end of the snap element with respect to the height direction is connected to the tongue base section, wherein the free end of the snap element, i.e. the upper end of the snap element with respect to the height direction, is bent away from the tongue base section in a direction perpendicular to the plane unfolded by the tongue base section.

[0024] Overall, a portion of the tongue is used as a snap-in element in a material-saving manner.

[0025] According to a suitable development, the first angle of inclination, i.e. the angle between the base section of the tongue and the snap element, is between 20° and 35°, in particular between 25° and 30°. In particular, if the electronics compartment cover and thus the tongue is formed from an aluminum-magnesium alloy, in particular EN AW 5754, it has a relatively low elastic deformation capacity. When the first angle of inclination is between 20° and 35°, in particular between 25° and 30°, the extent of elastic deformation of the tongue during assembly is sufficient to form a secure rear inlay.

[0026] According to a suitable embodiment, the tongue, in particular the tongue base section, i.e. the section of the tongue on which the snap element is arranged, opens out a plane which is oriented parallel to the free end of the outer wall, in particular parallel to the section of the free end of the outer wall extending beyond the tongue. In this way, the structural space required for the snap connection is relatively small.

[0027] According to a preferred design, the tongue base section of the tongue is inclined at a second inclination angle relative to the height direction. Preferably, the lower end of the tongue with respect to the height direction is inclined away from the side wall of the electronics compartment.

[0028] Suitably, the second inclination angle is between 0.1° and 5°, in particular between 0.5° and 2.0°, and preferably 1°.

[0029] In this way, the deformation required during the assembly process is reduced, so that a secure hold is achieved even when the cover consists of a relatively elastically non-deformable material, such as an aluminum-magnesium alloy (in particular made of EN AW 5754).

[0030] In a suitable embodiment, the snap-on nose is formed by means of the side wall. In particular, the snap-on nose is formed onto the side wall and / or by means of the side wall. For example, the side wall has an undercut on the outside, i.e. a recess into which the snap-on element is inserted to form the snap-on connection. In this embodiment, the snap-on element is advantageously bent toward the side wall. Advantageously, in this variant, the snap-on nose function is integrated into the side wall.

[0031] According to an alternative design, the snap-on nose is arranged spaced apart from the side wall and is preferably arranged parallel. Here, in the assembled state, the tongue is arranged between the side wall and the snap-on nose, that is, it extends between the side wall and the snap-on nose. In this design, the snap-on element is preferably bent away from the side wall.

[0032] According to a suitable development that can be used for both variants, the side of the snap-in nose facing the tongue is inclined at a third inclination angle γ relative to the height direction H. During assembly, i.e. when the electronics compartment cover is plugged in, this side in particular forms a guide surface for the snap-in element. During assembly, the snap-in nose is therefore pressed against the guide surface and slides on it counter to the height direction, wherein the tongue is continuously deformed.

[0033] Particularly preferably, the third angle of inclination, i.e. the angle between the height direction and the side of the snap-in nose facing the tongue, is preferably between 5° and 20°, in particular between 7° and 15°. In this way, assembly is facilitated, in particular the formation of the snap connection, in particular for covers made of relatively elastically non-deformable materials such as aluminum-magnesium alloys (in particular EN AW 5754). BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The embodiments of the present invention are explained in more detail below with reference to the accompanying drawings, wherein:

[0035] Figure 1 schematically shows a cross section of an electric motor having a motor carrier, wherein the motor carrier forms an electronics compartment for motor electronics and wherein the electronics compartment is closed with an electronics compartment cover;

[0036] Figure 2 A perspective view of a first variant of a motor carrier is shown, in which the side wall of the electronics compartment has snap-in projections which engage from behind with snap-in elements of tongues of the electronics compartment cover to form a snap-in connection;

[0037] Figure 3 A top view of a tongue of an electronics compartment cover is shown, wherein a U-shaped inner seam is introduced into the tongue to form a snap-fit ​​element;

[0038] Figure 4 The cross-sectional view shows a perspective view of a motor carrier and a Figure 2 A cross-section of an electronic device hatch cover, wherein the cross-section plane passes through the snap connection portion;

[0039] Figure 5 Shown on an enlarged scale Figure 4 A top view of a region V;

[0040] Figure 6 A cross section of the electronics bay cover is shown on an enlarged scale, with the section plane passing through the tab;

[0041] Figure 7 A cross section of a snap-on nose of a side wall of an electronics bay is shown on an enlarged scale;

[0042] Figure 8shows a perspective view of a second variant of the motor carrier, in which the snap-on nose is spaced apart from the side wall of the electronics compartment;

[0043] Fig. 9 The cross-sectional view shows the Figure 7 A cross section of a motor carrier and an electronics compartment cover, wherein the section plane passes through the snap-fit ​​connection; and

[0044] Fig.10 Shown on an enlarged scale Fig. 9 A top view of region X.

[0045] Parts and dimensions that correspond to one another are always provided with the same reference symbols in all the figures. DETAILED DESCRIPTION

[0046] Figure 1 2 shows an electric motor 2 which is designed as an inner rotor by way of example and which is provided in particular for a radiator fan.

[0047] The electric motor 2 comprises a rotor 4 and a stator 6, wherein the rotor 4 is connected to the fan wheel in a manner not shown in detail and drives the fan wheel in rotation. According to the embodiment shown here, the rotor 4 is arranged radially inside the stator 6. In other words, the electric motor 2 is configured as an inner rotor.

[0048] The electric motor 2 further comprises a motor carrier 8, to which the stator 6 is fastened. For example, the plastic encapsulation of the lamination stack of the stator has cylindrical projections 10 for this purpose, which are received in corresponding receptacles 11 of the motor carrier 8 and are hot-riveted there, for example. The bearing for the rotor shaft 12 of the rotor 4 is fastened to the motor carrier in a manner not shown in detail.

[0049] The motor carrier 8 further comprises a flange 14 with screw lead-throughs 16 for fastening to a frame.

[0050] The motor carrier 8 is arranged above the stator 6 in the axial direction, ie along an axis defined by the rotor shaft 12. The motor carrier 8 is designed integrally, ie in one piece. For example, the motor carrier 8 is a cast part.

[0051] The motor carrier 8 forms an electronics compartment 18, i.e., a receiving space for motor electronics 20. The coils of the stator 6 are energized by means of the motor electronics 20 in order to generate a rotating field and thus to rotate the rotor. For this purpose, the motor electronics 20 expediently comprises a circuit board and / or a bridge circuit electrically connected to the coils.

[0052] To form the electronics compartment, the motor carrier 8 has an electronics compartment 18, an electronics compartment bottom 22 and side walls 24 that stand vertically relative to the electronics compartment bottom 22 in a height direction H that is oriented parallel to the axial direction in this embodiment of the electric motor 2. The side walls 24 surround the electronics compartment 18 in a frame-like manner.

[0053] The electronics compartment cover 26 of the electric motor 2 covers the electronics compartment 18. Here, the electronics compartment cover 26 has a receptacle 28 for the free end 30 of the side wall 24 on its periphery. The receptacle 28 is configured as a groove. Therefore, the receptacle 28 has a U-shaped cross-section. Here, two groove walls 32, 34 are arranged on the inner side or the outer side of the side wall 24 in the area of ​​the free end 30. The groove bottom 36 is arranged above the free end in the height direction and connects the two groove walls 32, 34. In short, the groove-like receptacle 28 surrounds the free end 30 of the side wall 24. The groove wall 32 arranged on the outer side of the side wall 24, that is, on the side facing away from the electronics compartment 18, is also referred to as the outer wall 32 here and below.

[0054] Thus, the free end 30 of the side wall 24 facing away from the electronics compartment bottom 22 is received in the receiving portion 28 and there bonded in a particularly fluid-tight manner to the electronics compartment cover 26. In other words, the gap 38 formed between the free end 30 of the side wall 24 and the receiving portion 28 is provided with an adhesive (not shown) so that the gap 38 is closed in a fluid-tight manner, in particular in an air-tight and liquid-tight manner.

[0055] The electronics compartment cover 26 is connected to the motor carrier by means of at least one snap connection (snap lock) 40 for the purpose of fixing during gluing ( Figure 1 The two snap connections are designed identically. The electronics compartment cover 26 is formed, for example, from an aluminum-magnesium alloy, in particular EN AW 5754.

[0056] Figures 2 to 6 A first variant of the snap connection is shown in FIG. Figures 8 to 10 A second variant of the snap-in connection is shown. In both variants, two snap-in connections 40 are provided by way of example, which are designed similarly to one another, ie, of the same type.

[0057] In both variants, the tongue 42 extends from the outer wall 32 , i.e. from the outer groove wall 32 of the receptacle, in a direction counter to the height direction H. Here, the tongue 42 extends from a free end 44 of the outer wall 32 , i.e. from an edge of the outer wall and projects from the edge in a direction counter to the height direction H. In particular, the tongue 42 and the outer wall 32 have the same thickness, i.e. the same material thickness.

[0058] Furthermore, both variants have in common that the tongue 42 has a tongue base section 46 connected to the outer wall and a snap-on element 48 arranged on the tongue base section 46. To form the snap-on connection, the snap-on element 48 engages from behind a snap-on nose 50 of the motor carrier 8 arranged outside the electronics compartment 18. Here, the snap-on element 48 is arranged below the snap-on nose 50 with respect to the height direction H and, if necessary, presses against it.

[0059] Furthermore, in both variants, the snap-on element 48 is formed in such a way that the tongue 42 has an inner seam which has a U-shape which is open downward (with respect to the height direction H). The inner seam is continuous in a direction perpendicular to the side wall 24 so that the section of the tongue 42 enclosed by the inner seam can be bent out from the remaining area of ​​the tongue.

[0060] The inner seam thus has two vertical seams 52 a extending parallel to the height direction H and a horizontal seam 52 b oriented perpendicularly to the vertical seams and connecting the two vertical seams at their upper ends (with respect to the height direction H).

[0061] In other words, the tongue base section 46 forms an especially flat frame which encloses the rectangular recess. The snap-in element 48 is formed here on the side of the frame which delimits the recess downwardly with respect to the height direction H. The width b of the frame is, for example, 2 mm.

[0062] In other words, the lower end of the snap-in element 48 with respect to the height direction H is connected to the tongue base section 46, wherein the free end of the snap-in element 48, i.e., its upper end with respect to the height direction H, is bent out from the tongue base section 46 in a direction perpendicular to the plane unfolded by the tongue base section 46.

[0063] The plane in which the tongue base section 46 of the tongue 42 extends is in each case oriented parallel to the free end 44 of the outer wall 32 .

[0064] In a first variant, see Figures 2 to 6 , the snap element 48 is bent toward the side wall 24 and is thus inclined toward the side wall. In other words, the snap element 48, in particular its free end, protrudes from the plane spanned by the tongue base section 46 toward the side wall 24. The first inclination angle α between the tongue base section 46 and the snap element 48 is between 20° and 35°, preferably between 25° and 30°, and according to the example shown here is 29°.

[0065] According to this first variant, the snap-in lug 50 is arranged on or formed by the side wall 24. The angle between the underside 54 of the snap-in lug 50 and the height direction H or the outer side of the side wall 24 is expediently a right angle.

[0066] The snap-on nose 50 has a guide surface for the snap-on element 48, along which the snap-on element 48 slides against the height direction H during assembly, wherein a corresponding (elastic) deformation of the snap-on element 48 occurs. The guide surface, i.e. the snap-on nose 50, is inclined at a (third) inclination angle relative to the height direction H in the assembled state toward the tongue 42, in particular toward the tongue base section 46 of the tongue. Here, the third inclination angle γ is between 5° and 20°, in particular between 7° and 15°. Here, the upper end of the snap-on nose 50 is further away from the tongue base section 46 than its lower end. Therefore, the lower end of the snap-on nose 50 protrudes further away from the side wall than its upper end. In other words, the snap-on nose 50 tapers in the height direction H.

[0067] Overall, the snap-in element 48 projects toward the side wall 24 and engages behind the snap-in projection 50 to form the snap-in connection 40 .

[0068] For the second variant, see Figures 8 to 10 , the above statements for the first variant also apply except as follows.

[0069] In this second variant, the snap-on nose 50 is spaced apart from the side wall 24, for example, it is fastened by means of a rib 58 of the motor carrier 8. In the state in which the electronics compartment cover 26 is mounted on the electronics compartment 18, the tongue 42 projects between the side wall 24 and the snap-on nose 50. Thus, during the assembly process, the tongue 42 is inserted between the side wall 24 and the snap-on nose 50.

[0070] The snap-in element 48 is bent away from the side wall 24 , ie, toward the snap-in lug 50 , in other words, away from the electronics compartment. In the assembled state, the snap-in element 48 engages behind the snap-in lug 50 to form the snap connection 40 .

[0071] In a similar manner to the first variant, the snap-on nose 50 comprises a guide surface which is formed by a side 56 of the snap-on nose 50 facing the tongue base section 46 and thus the side wall 24 in the assembled state. Here, the third inclination angle γ, i.e. the angle between the side 56 and the height direction H, is between 5° and 20°, in particular between 7° and 15°, and according to the example shown here is 10°. The upper end of the side 56 in the height direction H is inclined away from the side wall 24. As a result, the distance between the side 56 and the side wall 24 increases in the height direction H.

[0072] In this second variant, the first angle of inclination α between the tongue base section 46 and the latching element 48 is likewise between 20° and 35°, preferably between 25° and 30°, and according to the example shown here is 25°.

[0073] In both variants, the tongue base section 46 of the tongue 42 is inclined at a second inclination angle β relative to the height direction H. The second inclination angle β is between 0.1° and 5°, in particular between 0.5° and 2.0°, and according to the example shown here is 1°. The lower end of the tongue with respect to the height direction H is inclined away from the side wall 24 .

[0074] The present invention is not limited to the above-described embodiments. On the contrary, those skilled in the art may also derive other variants of the present invention within the scope of the claims without departing from the subject matter of the present invention. In addition, in particular, all individual features described in conjunction with the embodiments and / or in the claims may also be combined with each other in other ways without departing from the subject matter of the present invention.

[0075] Reference numerals list

[0076] 2 Electric motors

[0077] 4 rotors

[0078] 6 Stator

[0079] 8 Motor carrier

[0080] 10 protrusion

[0081] 11 Accommodation portion of motor carrier

[0082] 12 Rotor shaft

[0083] 14 Flange

[0084] 16 Screw insertion part

[0085] 18 Electronics compartment

[0086] 20Motor electronics

[0087] 22 Bottom of the electronics compartment

[0088] 24 Sidewall

[0089] 26 Electronic device hatch

[0090] 28 Accommodation

[0091] 30 Free end of side wall

[0092] 32Outer tank wall / outer wall

[0093] 34 inner tank wall

[0094] 36 slot bottom

[0095] 38 Gap

[0096] 40 snap connection

[0097] 42 tab

[0098] 44 Free end of outer wall / groove wall

[0099] 46 tongue base section

[0100] 48 snap-on components

[0101] 50 buckle nose

[0102] 52 Inseam

[0103] 52a Vertical seam

[0104] 52b horizontal seam

[0105] 54 lower side

[0106] 56 side of the buckle nose

[0107] 58 ribs

[0108] B Width

[0109] HHeight direction

[0110] αThe first tilt angle

[0111] β Second tilt angle

[0112] γThe third tilt angle

Claims

1. An electric motor (2), in particular an electric motor for a radiator fan, said electric motor having - a motor carrier (8) having an electronics compartment (18) for motor electronics (20), wherein: The electronic device cabin comprises an electronic device cabin bottom (22) and a side wall (24) erected relative to the electronic device cabin bottom (22) in a height direction (H). - an electronics compartment cover (26), the electronics compartment cover being used to close the electronics compartment (18), - wherein the electronics compartment cover (26) has a, in particular groove-like, receptacle (28) for the free end of the side wall (24), wherein the receptacle (28) has an outer wall (32) arranged on the outside of the side wall (24), - wherein the tongue (42) extends from the outer wall (32), in particular from a free end (44) of the outer wall, counter to the height direction (H), and wherein the tongue (42) has a tongue base section (46) and a snap-in element (48) arranged on the tongue base section for forming a snap-in connection (40) with a snap-in nose (50) of the motor carrier (8).

2. The electric motor (2) according to claim 1, It is characterized in that The tongue (42) has a U-shaped inner seam (52), wherein a section of the tongue (42) surrounded by the inner seam (52) is inclined at a first inclination angle (α) toward the side wall (24) or away from the side wall to form the latching element (48).

3. The electric motor (2) according to claim 2, It is characterized in that The first inclination angle (α) is between 20° and 35°, in particular between 25° and 30°.

4. The electric motor (2) according to any one of claims 1 to 3, It is characterized in that A tongue base section (46) of the tongue (42) spans a plane oriented parallel to a free end of the outer wall (32).

5. The electric motor (2) according to any one of claims 1 to 4, It is characterized in that - a tongue base section (46) of the tongue (42) is inclined at a second inclination angle (β) relative to the height direction (H), and / or The second inclination angle (β) is between 0.1° and 5°, in particular between 0.5° and 2.0°, preferably 1°.

6. The electric motor (2) according to any one of claims 1 to 5, It is characterized in that The snap-on nose (50) is formed by means of the side wall (24).

7. The electric motor (2) according to any one of claims 1 to 5, It is characterized in that The snap-on lug (50) is arranged at a distance from the side wall (24), wherein the tongue projects between the side wall (24) and the snap-on lug (50).

8. The electric motor (2) according to any one of claims 1 to 7, It is characterized in that - a side (56) of the snap-on nose (50) facing the tongue (42) forms a guide surface for assembling the snap-on element (48) and is inclined at a third inclination angle (γ) relative to the height direction (H), and / or - The third inclination angle (γ) is between 5° and 20°, in particular between 7° and 15°.

9. The electric motor (2) according to any one of claims 1 to 8, It is characterized in that The electronics compartment cover (26) is formed from an aluminum-magnesium alloy, in particular EN AW 5754.

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