Electric motor, in particular radiator fan motor

Abstract

The invention relates to an electric motor (1), comprising: a motor carrier (4) having an electronics compartment (5) and an axially raised sealing wall (41) or receiving groove (42); a stator (2) having a stator base body (7) with radially outwardly directed stator teeth (10) and a stator winding (8) arranged on the stator teeth; a rotor (3) surrounding the stator (2) and having a pot-shaped rotor housing (23) with permanent magnets (24) arranged on the inner wall side; and an electronics compartment cover (6) having a cover base (6a) and a cover wall (6b) which is axially oriented with respect to the motor axis (D) and which forms, with the sealing wall (41) or the receiving groove (42) of the motor carrier (4), at least one adhesive gap (45a, 45b, 46) for receiving a potting compound (V) for sealing the electronics compartment (5).

Description

Technical Field

[0001] The invention relates to an electric motor, in particular a brushless outboard motor, preferably a radiator fan motor for a motor vehicle. Background Art

[0002] Such electric motors usually include a rotor which is supported so as to be rotatable relative to a stationary stator. In brushless electric motors, the stator is provided with a stator winding or a rotating field winding, which generates a rotating magnetic field by applying an alternating current to the stator winding or the rotating field winding. The rotor is usually provided with permanent magnets which generate a rotor magnetic field which interacts with the rotating field of the stator.

[0003] In brushless electric motors, the alternating current that is used to feed the stator winding is usually generated by a converter (inverter). In smaller electric motors, the converter is usually accommodated together with the associated control electronics in an electronics compartment that is integrated into the electric motor or its motor housing. The control electronics are protected from moisture, so that in such electric motors that are used in motor vehicles, for example as radiator fan motors, higher requirements are placed on the sealing of the electronics compartment. In addition, the stator winding should be reliably electrically insulated relative to the stator base body, which is usually constructed as a laminated core consisting of stacked laminations.

[0004] The brushless electric motor, in particular a radiator fan motor, known from EP 2 852 035 B1 and designed as an inner rotor (motor), comprises a rotor supported in a manner rotatable relative to a stator and a motor carrier, which contains an electronics compartment sealed or sealable with an electronics compartment cover for accommodating converter electronics. The converter electronics comprise a circuit board equipped with passive and active components and with power semiconductors connected in a bridge circuit. The electronics compartment cover has a circumferential sealing groove, while the motor carrier has a sealing edge or sealing web surrounding the electronics compartment in the region of the electronics compartment, which is embedded in the sealing groove of the electronics compartment cover in a form-fitting manner. A filling gap for accommodating a sealing compound is left between the carrier-side sealing edge or sealing web and the cover-side sealing groove. For centering and for uniform formation of the gap, spacer bumps or spacer ridges are provided at the exposed locations. It has been shown that such a web-groove profile is susceptible to gap corrosion and / or corrosive penetration. Summary of the invention

[0005] The object of the present invention is therefore to specify an electric motor in the form of an external rotor motor, the electronics or the electronics compartment of which is reliably sealed. In particular, crevice corrosion and / or corrosive penetration in the most moisture-tight or liquid-tight joint region between the motor carrier and the electronics compartment cover should be reliably avoided.

[0006] This object is achieved according to the invention by the features of claim 1. Advantageous variants, embodiments and improvements are the subject matter of the dependent claims.

[0007] A brushless electric motor, which is provided and designed, in particular for a radiator fan motor of a motor vehicle, has a plate-shaped or plate-shaped motor carrier (motor carrier plate), which has an electronics compartment for accommodating electronic components (converter electronics); and a stator and a rotor surrounding the stator, the rotor having a pot-shaped rotor housing, on the inner wall side of which a permanent magnet is arranged at the annular wall or housing wall of the rotor housing. The stator of the electric motor, which is implemented as an external rotor motor, is arranged on the carrier side of the motor carrier facing away from the electronics compartment. The stator has a stator base body, which is preferably implemented as a laminated core consisting of stacked stator sheets or laminations. The stator or its stator base body has a preferably annular base section and stator teeth arranged outside the ring and pointing radially outward, on which the coils of the stator winding (rotating field winding) are arranged. The rotor is mounted rotatably about a motor axis or rotational axis which is preferably fastened, for example cast, in the motor carrier as a rigid rotational axis, for example as a rigid rotational pin.

[0008] The motor carrier has a sealing wall or a receiving and / or sealing groove axially raised with respect to the motor axis on the carrier side assigned to the electronic device compartment. The electronic device compartment cover that closes the electronic device compartment has a cover bottom and a cover wall portion formed at the cover bottom and axially oriented with respect to the motor axis, and the cover wall portion and the sealing wall of the motor carrier form at least one bonding gap or sealing groove for receiving a potting compound (sealing compound) for sealing the electronic device compartment.

[0009] The carrier-side sealing wall may have a step on the inner wall side, and the cover wall of the electronic component compartment cover abuts against the step, thereby forming a sealing groove for the potting compound. Particularly preferably, the carrier-side sealing wall is configured as a double wall with a receiving groove, and the cover wall of the electronic component compartment cover protrudes into or embeds into the receiving groove. In other words, the carrier-side receiving groove is formed by two groove walls extending in parallel, especially as sealing walls, and a groove bottom.

[0010] Suitably, a radial bonding gap (with respect to the motor axis) for the potting compound is formed on both sides of the cover wall portion of the electronic component compartment cover that protrudes into the receiving groove of the carrier-side sealing wall. An axial bonding gap (with respect to the motor axis) for the potting compound is formed in an appropriate manner between the groove bottom of the receiving groove formed in or by the carrier-side sealing wall and the cover wall portion of the electronic component compartment cover that protrudes into the receiving groove.

[0011] By forming the adhesive gap radially and axially, a sealing contour (which is expediently U-shaped in cross section) is advantageously provided, which forms a particularly large penetration distance or a particularly long path for moisture. Thus, crevice corrosion is reliably prevented immediately after the sealing groove or the radial and axial adhesive gap has been filled with potting compound.

[0012] In an advantageous embodiment, at least one supporting boss extends into the receiving groove of the sealing wall on the carrier side, and the electronic component compartment cover is supported on the supporting boss, thereby forming an axial gap as an axial bonding gap for the potting compound. A plurality of such supporting bosses are arranged along the receiving groove of the sealing wall on the carrier side in a suitable manner. The supporting boss or each supporting boss is suitably formed on the groove wall of the receiving groove on the carrier side facing away from the electronic component compartment.

[0013] According to another advantageous embodiment, the cover wall of the electronics compartment cover that protrudes into the receiving groove on the carrier side has at least one outwardly protruding stamped tongue. The stamped tongue rests on the groove wall of the receiving groove, preferably on one of the supporting bosses, thereby forming an axial gap as an axial bonding gap for the potting compound. A plurality of such stamped tongues are arranged in a suitable manner along the receiving groove of the sealing wall on the carrier side.

[0014] In an appropriate manner, at least one abutment boss or a spacing boss extends into the receiving groove, and the cover wall of the electronic device compartment cover is supported on at least one abutment boss or a spacing boss, thereby forming a radial bonding gap for the potting material or the radial bonding gap for the potting material. Preferably, a plurality of such abutment bosses are provided along the receiving groove of the sealing wall on the carrier side. The abutment boss or each abutment boss is suitably formed on the groove wall of the receiving groove on the carrier side facing the electronic device compartment.

[0015] In other words, when the electronics compartment cover is inserted into the electronics compartment and the cover wall or the cover wall portion here protrudes into the receiving groove on the carrier side, the abutment boss and the support boss are used to achieve reliable centering or positioning of the electronics compartment cover on the one hand, and on the other hand, a reliable bonding gap is formed on both sides of the cover wall portion and between the cover wall portion and the groove bottom of the receiving groove. Therefore, compared with a one-sided gap between the cover wall of the electronics compartment cover and the sealing groove on the carrier side, a path as long as possible for moisture is constructed, which in turn significantly reduces the risk of gap corrosion.

[0016] A particularly advantageous development provides that the carrier-side sealing wall encloses a plug compartment that can be cast with a potting compound and has a wallless end face, into which the plug part is inserted or can be inserted. The plug part is also provided with a receiving groove in an appropriate manner, which, when the plug part is installed, is flush with or corresponds to the carrier-side receiving groove, so that when the plug part is inserted into the wallless end face, a circumferentially closed receiving groove is provided for the preferably likewise circumferentially closed cover wall of the electronics compartment cover.

[0017] The plug part also advantageously forms a partition wall between the carrier-side electronics compartment and the carrier-side plug compartment. The plug compartment has a further wallless end face in a suitable manner opposite the plug part, into which the other plug part is or can be appropriately inserted. This again forms a closed plug compartment which can also be filled with potting compound during the filling of the sealing groove or the receiving groove when the electronics compartment cover is inserted as required. The further plug part is connected in a suitable manner to a connecting cable with supply and / or control lines, which can be connected to the onboard power supply of the motor vehicle in order to supply the motor electronics with current, voltage and / or signals. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Next, embodiments of the present invention will be explained in more detail with reference to the accompanying drawings, wherein:

[0019] Figure 1 The exploded view shows a brushless electric motor in an outer rotor embodiment, in particular as a radiator fan drive for a motor vehicle, the electric motor having a rotor, a stator with a stator winding (rotating field winding) and a motor carrier having an electronics compartment for motor electronics (converter electronics) which can be closed by an electronics compartment cover;

[0020] Figure 2 The cross-sectional diagram shows Figure 1 Electric motor;

[0021] Figure 3 The electric motor is shown in a top view of the rotor housing;

[0022] Figure 4 The electric motor is shown in a perspective view, with the electronics compartment cover removed, and the electronics compartment on the carrier side surrounded by the seal or receiving groove can be seen;

[0023] Figure 5 In accordance with Figure 4 The illustration of shows an electric motor, wherein the motor electronics are removed from the electronics compartment on the carrier side;

[0024] Figure 6An electric motor with an installed electronics bay cover is shown in a top or bottom view;

[0025] Figure 7 along Figure 6 The line VII-VII in FIG. 1 shows a perspective sectional view in the region of the support point forming the radial and axial bonding gap in the sealing or receiving groove of the electronics compartment cover on the carrier side; and

[0026] Figure 8 along Figure 6 The line VIII-VIII in FIG. 1 shows a further sectional view in the region of the adhesive gap formed between the cover wall of the electronics compartment cover and the sealing or receiving groove on the carrier side.

[0027] Corresponding parts and parameters are provided with the same reference numerals in all the figures. Figure 2 The motor axis (rotor axis) D shown in FIG. Figure 2 The axial direction and radial direction A or R are shown in FIG. DETAILED DESCRIPTION

[0028] exist Figure 1 and Figure 2 , an electric motor 1 is shown in an exploded view or sectional view in the embodiment of an external rotor, which is preferably provided and set up as a drive for a radiator fan of a motor vehicle. The electric motor 1 essentially has a stator 2 and a rotor 3 surrounding the stator and a (plate-like or plate-shaped) motor carrier 4, also referred to as a carrier plate in the following, with an electronics compartment 5, which can be closed with an electronics compartment cover 6. The motor carrier 4 is preferably an aluminum die casting. The electronics compartment cover 6, which is preferably made of aluminum or stainless steel, has a cover bottom 6a and a cover wall 6b formed on the cover bottom.

[0029] The stator 2 has a stator base body 7 and a stator winding or rotating field winding 8. The stator base body 7 is preferably formed by several laminations stacked to form a lamination stack. The stator 2 or its stator base body 7 has an annular base part 9 and stator teeth 10 formed on the outside on the base part and pointing radially outward.

[0030] Coil insulation or winding insulation 11, 12 are arranged on both sides of the stator base body 7 or the laminated core, which are also referred to below as the upper coil insulation 11 facing away from the motor carrier 4 and the lower coil insulation 12 facing the motor carrier 4. The coil insulation 11, 12, which is preferably made of plastic, for example produced as an injection-molded part, covers the stator base body 7, in particular the stator teeth 9, at or on the stator side. The stator base body 7 of the stator 2 covered with the coil insulation 11, 12 is provided with a stator winding 8, which is preferably composed of coils 13 interconnected with each other, which are in turn wound onto the individual stator teeth 10.

[0031] exist Figure 1 In the figure, the two coil insulators 11 and 12 are shown separately in order to see them clearly. Figure 2 , the actual installation state of the stator base body 7 provided with coil insulations 11, 12 is shown. The stator base body is located between the coil insulations 11, 12 and is wound with coils 13 of the stator winding 8. The winding collar or winding head 14 of the stator winding 8 is electrically conductively connected to a busbar-like connecting contact 15, which is in contact with a contact pin 16, for example welded.

[0032] The motor carrier 4 has a rigid rotation axis in the form of a pin 17 on its carrier side associated with the stator 2 and the rotor 3, which is injected into the motor carrier 4 or arranged in a rotationally fixed manner, for example cast or pressed into a pin receptacle of the motor carrier 4. The pin 17 forms a rotation axis or motor axis D of the electric motor 1 or the rotor 3 to a certain extent.

[0033] On the carrier side facing away from the stator 2 and the rotor 3 , an electronics compartment 5 for the motor electronics 18 is arranged in the motor carrier 4 . Figure 2 and Figure 3 The electronics compartment 5 opens at the end into a plug compartment 20 , in the exemplary embodiment, two of which are provided for connection to the connecting cables 19 ( Figure 2 ) can be inserted into the plug compartment, which plug parts are also referred to below as inner plug part 21 and outer plug part 22. In the installed state of the electric motor 1, the electronics compartment 5 is sealed with an electronics compartment cover 6, in particular moisture-tight.

[0034] The rotor 3 has a pot-shaped rotor housing 23 with a housing bottom 23a and a housing wall (annular wall or housing wall) 23b oriented in the axial direction A. Permanent magnets 24 are arranged on the housing wall on the inner wall side. The rotor housing 23 has a centrally deep-drawn, preferably hollow-cylindrical housing section in the housing bottom 23a as a bearing housing 25 for two rolling bearings or ball bearings 26 axially spaced apart (with respect to the axis of rotation D) in the exemplary embodiment. Their outer rings, not shown in detail, are held in a rotationally fixed manner in the deep-drawn bearing housing 25, and their inner rings, not shown in detail, are firmly connected to the shaft bolt 17, wherein a bearing ball (bearing element) 27 is arranged between the outer ring and the inner ring.

[0035] Mounting elements 28, such as screws, corresponding to the rotor housing 23 are used to fasten the fan impeller (not shown) of the radiator fan to the rotor 3. Further fastening elements 29, such as screws or bolts, are shown to fasten the stator 1 to the motor carrier 4. In addition, cup-shaped or stopper-shaped sealing elements 30 for the contact pins 16 can be seen in order to seal these contact pins with respect to the motor carrier 4. For this purpose, the motor carrier 4 has corresponding through-openings 31, in which the sealing elements 30, through which the contact pins 16 pass, are arranged in a sealing manner. The contact pins 16 extend into the electronics compartment 5 in order to make contact there with the motor electronics or converter electronics 18. In the exemplary embodiment, a three-phase stator winding 8 is provided, and accordingly three contact pins 16 are provided as phase connections for the stator winding or rotating field winding 8, which are connected to the coils 13 of the stator winding or rotating field winding 8 via connecting contacts 15 as contact elements and are led to the motor electronics 18 and (electrically) contacted there.

[0036] As in Figure 2 As can be seen in the figure, the annular base part 9 of the stator base body 7 forms a receiving or installation space 32. The shaft bolt 17 oriented in the axial direction A is located in this receiving or installation space as the rotation axis D of the rotor 3. In addition, the contact pin 16 used as a phase connection is located in this receiving space 32. In addition, radial tongues 33 serving as lead-throughs for the respective contact pins 16 extend into the receiving space 32. The radial tongues are formed by some of the laminations of the stator base body 7. The insulating bosses or insulating journals 34 preferably extend into the radial tongues 33 or their through-openings in a form-locking manner, and the insulating bosses 34 are passed through by the respective contact pins 16. The insulating bosses or insulating journals 34 are preferably Figure 1 and Figure 2 A component of the lower middle coil insulation 12 , ie preferably integrally formed onto the lower coil insulation.

[0037] In addition, observation Figure 1 , at least one further radial tongue 35 is formed by the stator base body 7 of the stator 2 or its laminated core, which projects into the receiving space 32. The radial tongues 35 have through-openings for respective fastening elements or fastening bolts 29 and are used together with the fastening elements or fastening bolts to hold, in particular screw-fasten, the stator 2 on the motor carrier 4.

[0038] Figure 3The electric motor 1 is shown in a top view of the rotor 3 or the rotor housing 23. It can be seen that a number of ventilation slots 36 are provided in the housing bottom 4 for dissipating the heat generated during motor operation of the electric motor 1. Further housing openings 37 are provided on the circumferential side or in the transition area between the housing bottom 23a and the housing wall 23b of the rotor housing 23. It can be seen that the plug compartment 20 connected to the electronics compartment 5 protrudes from the rotor 3. The plug compartment 20 therefore protrudes radially beyond the rotor 3.

[0039] Figure 4 The electric motor 1 is shown looking into the electronics compartment 5 from the carrier side facing away from the stator 2 and the rotor 3. A circuit board 39 for the electrical or electronic components of the motor electronics 18 and, for example, contact clips 40 for the contact pins 16 extending through the circuit board 39 can be seen there.

[0040] The electronic device compartment 5 is surrounded by an axially raised sealing wall 41. The sealing wall 41 on the carrier side has a receiving groove 42. In other words, the sealing wall 41 is constructed as a double wall to form a receiving groove 42 with parallel sealing walls or groove walls 43 and a groove bottom 44. In the installed state, the cover wall 6b of the electronic device compartment cover 6, which is preferably closed all around, is embedded in the receiving groove 42 on the carrier side. In other words, the electronic device compartment cover 6 is placed in the receiving groove 42 on the carrier side with its cover wall 6b.

[0041] The net width or groove width of the receiving groove 6 is at least slightly greater than the wall thickness of the cover wall 6b of the electronic component compartment cover 6. As a result, radial bonding gaps 45a, 45b are preferably formed on both sides of the cover wall 6b arranged in the receiving groove 42 on the carrier side, and the bonding gaps are also referred to as the outer bonding gap 45a and the inner bonding gap 45b in the following. The cover wall 6b of the electronic component compartment cover 6 is axially spaced from the groove bottom 44 of the receiving groove 42 in the installed state. Therefore, an axial bonding gap 46 is formed between the cover wall 6b of the electronic component compartment cover 6 or its (circumferential) wall edge and the receiving groove 42 on the carrier side.

[0042] When the electronics compartment cover 6 is placed in the receiving groove 42, the receiving groove 42 is filled with, for example, an initially liquid or viscous, curable potting compound or sealing compound V. Figure 2 As shown in the figure, the potting material or sealing material V filled or capable of being filled into the outer radial bonding gap 45a also enters into the inner radial bonding gap 45b via the axial bonding gap 46, and the inner radial bonding gap is covered by the cover bottom 6a of the electronic component compartment cover 6.

[0043] Figure 7 and Figure 8The sectional view shows the installed electronics compartment cover 6 before the potting compound is filled into the carrier-side receiving groove 42. In order to form an axial bonding gap 46, a local support boss 47 is provided in the carrier-side receiving groove 42, which radially (in the radial direction R) extends into the receiving groove 42. The cover wall 6b of the electronics compartment cover 6 has a radially outwardly oriented support tongue 48, which abuts or rests against the corresponding support boss 47 of the carrier-side receiving groove 42. The support tongue 48 is embodied in a suitable manner as a stamped tongue or a bent tongue of the electronics compartment cover 6, for example, made of aluminum.

[0044] Abutment boss or abutment convex block 49 extending into the receiving groove is provided at the groove wall 43 of the receiving groove 52 on the carrier side opposite to the supporting boss 47. The abutment boss or abutment convex block is preferably used for centering or positioning the electronic device compartment cover 6 or its cover wall 6b in the receiving groove 42 on the carrier side.

[0045] Depend on Figure 5 It can be seen more clearly that the radially inner plug part 21 forms, at the end side 19 of the electronics compartment 5, in the region of the sealing groove or receiving groove 42 on the carrier side, a dividing wall between the electronics compartment 5 shown here without a circuit board and the plug compartment 20. On the other hand, a receiving groove 50 on the plug part side is provided in or at the inner plug part 21, the receiving groove 50 on the plug part side being matched in size to the receiving groove 42 on the carrier side. In the illustrated installed state, the receiving groove 50 on the plug part side is flush with the receiving groove 42 on the carrier side and forms, with the receiving groove on the carrier side, a surrounding closed receiving groove 42, 50 for the cover wall 6b of the electronics compartment cover 6. The plug compartment 20 is, in principle, wallless at the end side opposite the inner plug part 21. The radially outer plug part 22 is arranged in the wall recess 51 ( Figure 1 ), thereby forming a plug compartment 20 which is also closed all around.

[0046] Figure 6 The top view shows the carrier side of the mounting carrier 4 facing away from the stator 2 and the rotor 3, with the electronics compartment cover 6 plugged onto the electronics compartment 5. The axial bonding gap 46 formed or remaining between the electronics compartment cover 6 or its cover wall 6a and the carrier-side receiving groove 42 is also filled with potting compound V through the radially outer bonding gap 45a, as is the case with the radially inner bonding gap 45b, as shown in FIG. Figure 2 In the same process, the plug compartment 20 can also be filled with the potting compound V ( Figure 2 ).

[0047] Due to the formation of the carrier-side receiving groove 42 and the cover wall 6b of the electronic device compartment cover 6 which is placed in the receiving groove to form radial and axial bonding gaps 45a, 45b, 46, a high sealing property of the electronic device compartment 5 is established after the potting compound V is filled and cured. Here, the seal formed by the potting compound V based on the radial and axial bonding gaps 45a, 45b, 46 (like the cross-sectional profile of the bonding gaps 45a, 45b, 46 connected to each other or transitioning into each other) is roughly U-shaped in cross section. The cured potting compound V acts in the manner of a labyrinth seal. As a result, the largest possible penetration distance or the longest possible path for moisture is established. In turn, gap corrosion in the closed connection area between the electronic device compartment cover 6 and the motor carrier 4 is reliably prevented.

[0048] In summary, the present invention relates to an electric motor 1, which comprises: a motor carrier 4, the motor carrier having an electronic device compartment 2 and an axially raised sealing wall 41 or a receiving groove 42; a stator 2, the stator having a stator base body 7 with radially outwardly pointing stator teeth 10 and a stator winding 8 arranged on the stator teeth; a rotor 3 surrounding the stator 2 (about a rotation axis D), the rotor having a pot-shaped rotor housing 23, the rotor housing having permanent magnets 24 arranged on the inner wall side; and an electronic device compartment cover 6, the electronic device compartment cover having a cover bottom 6a and a cover wall 6b axially oriented with respect to the motor axis D, the cover wall together with the sealing wall 41 or the receiving groove 42 of the motor carrier 4 forms at least one bonding gap 45a, 45b, 46 for accommodating a potting material V for sealing the electronic device compartment 5.

[0049] The claimed invention is not limited to the above-described embodiments. Rather, a person skilled in the art can also derive other variants of the invention within the scope of the disclosed claims without departing from the subject matter of the claimed invention. In addition, all individual features described in conjunction with the various embodiments can also be combined in other ways within the scope of the disclosed claims without departing from the subject matter of the claimed invention.

[0050] Furthermore, the described solution can be used not only in the specifically shown application but also in a similar embodiment in other motor vehicle applications, such as door and tailgate systems, window lifts, adjustable seats and interior systems and electric drives.

[0051] Reference numerals list

[0052] 1 Electric motor

[0053] 2 Stator

[0054] 3 rotors

[0055] 4 Motor carrier / carrier plate

[0056] 5 Electronics compartment

[0057] 6 Electronic device cover

[0058] 6a Cover the bottom

[0059] 6b Cover wall

[0060] 7. Stator Matrix

[0061] 8 Stator winding / rotating field winding

[0062] 9 Base part

[0063] 10 stator teeth

[0064] 11 (upper) coil insulation

[0065] 12 (lower) coil insulation

[0066] 13 coils

[0067] 14 Winding ring / winding end

[0068] 15 Connecting contact

[0069] 16 contact pins

[0070] 17 Axis bolt

[0071] 18Motor electronics / converter electronics

[0072] 19 Connecting cable

[0073] 20 plug compartment

[0074] 21 (Inner) plug part

[0075] 22 (Outer) plug part

[0076] 23 rotor housing

[0077] 23a Shell bottom

[0078] 23b Shell wall / annular wall

[0079] 24 permanent magnets

[0080] 25 Housing section / bearing housing

[0081] 26 Rolling bearings / ball bearings

[0082] 27 bearing balls

[0083] 28 Mounting components

[0084] 29 Fastening elements

[0085] 30 Sealing element

[0086] 31Through opening

[0087] 32Accommodation space / installation space

[0088] 33 radial tongue

[0089] 34 Insulation boss / insulation journal

[0090] 35 radial tongue

[0091] 36 ventilation gaps

[0092] 37 Shell opening

[0093] 39 Circuit Board

[0094] 40 Contact Clip

[0095] 41 Sealing wall

[0096] 42 (Carrier side) receiving slot

[0097] 43 Sealing wall / groove wall

[0098] 44 slot bottom

[0099] 45a Outer radial bonding gap

[0100] 45b Inner radial bonding gap

[0101] 46 Axial bonding gap

[0102] 47 Support boss

[0103] 48 support tongue

[0104] 49 Abutment boss / Abutment bump

[0105] 50 (Plug part side) Receiving groove

[0106] 51 Wall Vacancy

[0107] A Axial direction

[0108] D Motor axis / rotation axis

[0109] R radial direction

[0110] VPotting material / sealing material

Claims

1. An electric motor (1), in particular a radiator fan motor of a motor vehicle, comprising: - a motor carrier (4), in particular a plate-shaped one, having an electronics compartment (5) for accommodating motor electronics (18), the motor carrier having a sealing wall (41) or a receiving groove (42) which is axially raised with respect to a motor axis (D) on a carrier side of the motor carrier (4) associated with the electronics compartment (5), - a stator (2) arranged on a carrier side of the motor carrier (4) facing away from the electronics compartment (5), the stator having a stator base body (7) with radially outwardly directed stator teeth (10) and a stator winding (8) arranged on the stator teeth, - a rotor (3) which surrounds the stator (2) about an axis of rotation (D), the rotor having a pot-shaped rotor housing (23) with permanent magnets (24) arranged on the inner wall side on a housing wall (25) of the rotor housing, and - An electronics compartment cover (6) for closing the electronics compartment (5), the electronics compartment cover having a cover bottom (6a) and a cover wall (6b) formed at the cover bottom and oriented axially with respect to the motor axis (D), the cover wall and the sealing wall (41) or the receiving groove (42) of the motor carrier (4) forming at least one bonding gap (45a, 45b, 46) for accommodating a potting material (V) for sealing the electronics compartment (5).

2. The electric motor (1) according to claim 1, characterized in that - the sealing wall (41) on the carrier side has a step on the inner wall side, and the cover wall (6b) of the electronic component compartment cover (6) is in contact with the step, thereby forming a bonding gap for the potting compound (V), and / or The carrier-side sealing wall (41) is designed as a double wall, thereby forming the receiving groove (42), into which the cover wall (6b) of the electronics compartment cover (6) projects or engages.

3. The electric motor (1) according to claim 1 or 2, It is characterized in that Radial bonding gaps (45a, 45b) for the potting compound (V) are respectively formed on both sides of a cover wall (6b) of the electronic component compartment cover (6) that protrudes into a receiving groove (42) of a sealing wall (41) on the carrier side.

4. The electric motor (1) according to any one of claims 1 to 3, It is characterized in that An axial bonding gap (46) for the potting compound (V) is formed between a groove bottom (44) of a receiving groove (42) preferably formed in or by a sealing wall (41) on the carrier side and a cover wall (6b) of the electronics compartment cover (6) protruding into the receiving groove.

5. The electric motor (1) according to any one of claims 1 to 4, It is characterized in that At least one supporting boss (47), preferably several supporting bosses, extends into the receiving groove (42), and the electronic component cover (6) is supported on the at least one supporting boss or the several supporting bosses, thereby forming an axial gap as an axial bonding gap (46) for the potting material (V).

6. The electric motor (1) according to claim 5, It is characterized in that The or each supporting projection (47) is formed on a groove wall (43) of the carrier-side receiving groove (42) facing away from the electronic component compartment (5).

7. The electric motor (1) according to any one of claims 1 to 6, It is characterized in that The cover wall (6b) of the electronic component compartment cover (6) extending into the receiving groove (42) on the carrier side has at least one outwardly protruding supporting tongue (48), preferably several supporting tongues, which abut against the groove wall (43) of the receiving groove (42), preferably against one of the supporting bosses (47), thereby forming an axial gap as an axial bonding gap (46) for the potting material (V).

8. The electric motor (1) according to any one of claims 1 to 7, It is characterized in that At least one abutment boss (49), preferably several abutment bosses, extend into the accommodating groove (42), and the cover wall (6b) of the electronic component compartment cover (6) is supported on the at least one abutment boss or the several abutment bosses, thereby forming a radial bonding gap (45b) for the potting material (V).

9. The electric motor (1) according to claim 8, It is characterized in that The abutment boss or each abutment boss (49) is formed in a groove wall (43) of the carrier-side receiving groove (42) facing the electronic component compartment (5).

10. The electric motor (1) according to any one of claims 1 to 9, It is characterized in that The carrier-side sealing wall (41) or receiving groove (42) encloses a plug chamber (20) which can be filled with the potting compound (V) and has a wall-free end side (19) into which the plug part (21) is inserted or can be inserted.

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