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) for accommodating motor electronics (18); a stator (2) which is fastened to the motor carrier (4) and has a stator winding (8); the stator (2) has a stator base body (7) which has an annular base body part (9) forming a receiving or mounting space (32) and stator teeth (10) which are directed radially outward, coil or winding insulators (11, 12) being arranged on the stator base body (7) of the stator (2) on the side of the stator (2) facing the motor carrier (4), contact pins (16) which are in contact with the stator winding (8) via connection contacts (15) are arranged in the receiving or mounting space (32), which contact pins are introduced into the electronics compartment (2) via sealing elements (30) in through-openings (31) of the motor carrier (4), and wherein the coil insulator or winding insulator (12) has a number of radially inwardly directed tabs (39) corresponding to the number of the contact pins (16), they project into the receiving or mounting space (32) and are penetrated by respective contact pins (16).

Description

Technical Field

[0001] The invention relates to an electric motor, in particular a brushless outboard motor, preferably a radiator fan motor of 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 has a stator winding or a rotating field winding, with which a magnetic rotating field is generated by applying an alternating current to it. The rotor is usually equipped 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 provided for supplying the stator winding is usually generated by a converter (inverter). In the case of smaller electric motors, the converter is often accommodated together with the associated control electronics in an electronics compartment, which is integrated into the electric motor or its motor housing. The control electronics (motor electronics) should be protected from moisture, so that in such electric motors, which are used in motor vehicles, for example as radiator fan motors, relatively high requirements are placed on the tightness of the electronics compartment. In addition, the stator winding should also be reliably electrically insulated from the stator base body, which is usually constructed as a laminated core from stacked sheet metal laminations.

[0004] According to EP 2 852 035 B1, a brushless electric motor, in particular a radiator fan motor, which is designed as an inner rotor (motor) comprises a rotor which is supported so as to be rotatable relative to a stator and a motor carrier, which comprises an electronics compartment which is closed or closable by means of an electronics compartment cover and serves to accommodate converter electronics. The stator with its radially inwardly directed stator teeth is injection molded with a plastic housing to insulate the stator winding, on which crimping lugs are molded which extend through fastening openings provided on the motor carrier and are, for example, hot-pressed and deformed during the joining process with the motor carrier which is manufactured as an (aluminum) casting.

[0005] Known sealing concepts for electric motors include sealing elements, which enable the winding ends or connecting ends of the stator-side rotating field winding, which are composed of coils, to be passed through in a sealed manner into the electronics compartment. For this purpose, sealing elements made of a two-component plastic are provided, which as a one-piece component include a hard sealing component and a relatively soft sealing component. In the installed state, the sealing elements with their relatively soft sealing component are inserted into the through-openings, which are opened in the bottom area of ​​the electronics compartment in the motor carrier. The relatively hard supporting component of the sealing element protrudes from the carrier side of the motor carrier facing the stator and is inserted axially above the stator-side plastic housing into a receiving recess opened therein. In order to reliably seal the winding ends at the point where they overflow from the softer sealing component, sealing sleeves that seal and wrap the respective winding ends are molded thereon. Summary of the invention

[0006] The object of the present invention is therefore to provide an outboard electric motor which is particularly suitable, in particular as a radiator fan motor. In particular, the coil insulation of the stator winding of the outboard motor should be suitable as an additional function for mechanically prestressing a sealing element accommodated in the motor carrier for the phase contacts.

[0007] 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.

[0008] An external rotor brushless electric motor, which is particularly designed and configured for a radiator fan motor of a motor vehicle, has a plate-shaped or plate-shaped motor carrier (motor carrier plate) with an electronics compartment for accommodating electronics (converter electronics); a stator, which includes a stator winding (rotating field winding); and a rotor surrounding the stator. The rotor has a pot-shaped rotor housing, on whose annular wall or housing wall the permanent magnets are arranged on the inner wall side. The rotor is supported in a manner that allows rotation about a motor axis or rotation axis, which is preferably fixed in the motor carrier as a rigid rotation axis (e.g. a rigid rotation pin), for example cast or cast therein.

[0009] The stator of the electric motor in the form of 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 embodied as a laminated core consisting of stacked stator laminations or sheet metal laminations. The stator or its stator base body has a preferably annular base segment and radially outwardly directed stator teeth arranged on the outside of the ring, on which the coils of the stator winding are arranged. In the embodiment of the stator base body composed of sheet metal laminations, they are generally composed of sheet metal rings with toothed laminations formed on the outer circumference and oriented in a star shape.

[0010] The annular base part of the stator base body forms a receiving or mounting space, in which axially oriented contact pins are arranged, which are in contact or can be in contact with the stator winding via the connecting contact. They are introduced into the electronics compartment via sealing elements, wherein these sealing elements are inserted into the through-openings of the motor carrier. The contact pins form phase connections to the motor electronics and for supplying power to the stator winding in a suitable manner. Suitably, three such contact pins are provided for a three-phase stator winding. The contact pins preferably extend over the entire axial spatial length or spatial height of the receiving or mounting space (in particular formed inside the stator base body and surrounded by its base part).

[0011] On the side of the stator facing the motor carrier or on the side of the stator facing the motor carrier and on the side facing the motor carrier, a coil insulator or winding insulator is arranged on its stator base. The coil insulator or winding insulator arranged on the stator base on the side of the stator facing the motor carrier is also referred to as the lower coil insulator or winding insulator below. The coil insulator or winding insulator arranged on the stator base on the side of the stator facing away from the motor carrier is also referred to as the upper coil insulator or winding insulator below.

[0012] The (lower) coil insulation or winding insulation arranged on the stator base body on the side of the stator facing the motor carrier has a number of radially inwardly directed webs corresponding to the number of contact pins, which webs extend into the receiving or installation space and are penetrated by the corresponding contact pins. It is particularly suitable that the stator is fastened to the motor carrier by means of a fastening element, wherein the webs of the (lower) coil insulation or winding insulation preferably rest on the sealing element penetrated by the contact pins while generating a preload on the sealing element.

[0013] In a suitable manner, the respective web, preferably formed on the (lower) coil insulator or winding insulator, has an axially protruding insulating journal on the web side facing away from the motor carrier, through which the respective contact pin penetrates. For this purpose, the web or insulating journal has a corresponding through-opening. In other words, the insulating journal, preferably formed on the respective web, is designed as a hollow cylinder.

[0014] In an advantageous embodiment, the respective web, preferably formed on the (lower) coil insulation or winding insulation, has a hollow cylindrical profile on the web side of the (lower) coil insulation or winding insulation facing the motor carrier, which hollow cylindrical profile rests on the associated sealing element and is penetrated by the respective contact pin. The profile preferably rests circumferentially on the sealing element only with its annular profile edge.

[0015] As a result or during the fastening of the stator or its stator base body to the carrier plate, the hollow cylindrical profile of the (lower) coil insulation or winding insulation is pressed against the associated sealing element, so that it is (mechanically) prestressed particularly advantageously without the need for additional components. As a result, a high degree of sealing is achieved in the region of the carrier-side leadthroughs for introducing the contact pins into the electronics compartment, without the need to provide additional components or parts for this purpose.

[0016] A suitable development provides that the stator base body has radial webs on the annular base part which are aligned with the through-openings of the motor carrier, and the radial webs include through-openings for the associated contact pins. In the installed state, when the stator is fastened to the motor carrier, the insulating pins of the respective webs of the (lower) coil insulator or winding insulator are inserted into the through-openings of the associated radial webs of the stator base body, in particular in a form-fitting manner. In this state, the respective contact pins penetrate the radial webs on the base body side and the preferably hollow cylindrical insulating pins inserted therein and the preferably arranged hollow cylindrical molded parts of the associated webs of the (lower) coil insulator or winding insulator. The hollow cylindrical insulating pins and the hollow cylindrical molded parts (which are arranged on the side of the web facing away from the insulating pins and are preferably molded on the webs like the insulating pins) are axially oriented so that their through-openings for the respective contact pins are aligned with each other.

[0017] According to a suitable embodiment, the (lower) coil insulator or winding insulator arranged on the stator base body on the side of the stator facing the motor carrier has a (central) annular body and a star-shaped radially outwardly directed tooth cap for the stator teeth, which is molded on the annular body on the circumferential side, wherein the web is molded on the annular body on the inner circumference. In a suitable manner, the respective tooth cap has a cap section extending in the plane of the annular body and a side cap section molded thereon, which extends in particular radially and is oriented axially. In other words, the side cap section is oriented in the radial direction and extends at least partially or in sections in the axial direction along the side surface of the stator tooth. The side cap section preferably covers the side surface of the stator tooth only partially in the axial direction, for example, on approximately half of its axial extension. The remaining area of ​​the stator tooth, for example, the other half of the axial extension of the side surface of the stator tooth is covered by the preferably arranged upper coil insulator or winding insulator.

[0018] Another advantageous embodiment provides that the through-opening of the motor carrier, which is provided for accommodating the sealing element for the contact pin, has a conical or circular cone-shaped opening section which tapers toward the electronics compartment. Additionally or alternatively, the respective sealing element has a certain number of radial ribs on the outer circumference. The respective sealing element can also be designed as a cone or a truncated cone. Furthermore, it can be provided that in the respective through-opening of the motor carrier, a cylindrical opening section is connected to a conical or circular cone-shaped opening section. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] An embodiment of the present invention is further described below in conjunction with the accompanying drawings.

[0020] Figure 1 An exploded view of an outboard brushless electric motor is shown, which comprises a rotor and a stator with a stator winding (rotating field winding) and a motor carrier with an electronics compartment for motor electronics (converter electronics) which can be closed by means of an electronics compartment cover.

[0021] Figure 2 The cross-sectional diagram shows Figure 1 The electric motor,

[0022] Figure 3 The (lower) coil insulator is shown in a perspective top view,

[0023] Figure 4 Shown in a three-dimensional upward or rear view according to Figure 2 The coil insulator,

[0024] Figure 5 A partial view of a stator of an electric motor with an upper coil insulator and a lower coil insulator is shown, with a view toward contact pins, which are arranged on the one hand in fork-shaped positioning or retaining elements of the upper coil insulator and on the other hand in insulating journals on the webs of the lower coil insulator.

[0025] Figure 6 The view toward the lower coil insulator and its tabs shows the Figure 5 A view of a stator-free base body with integrally formed insulating journals and contact pins inserted therein, and

[0026] Figure 7 Shown on an enlarged scale according to Figure 2 VII, in which a contact pin is passed in a sealed manner through the motor carrier into the electronics compartment. DETAILED DESCRIPTION

[0027] Corresponding parts and parameters are identified in all figures using the same reference numerals. For example, the description of the axial and radial directions is similar to Figure 2 The motor axis (rotation axis) D shown in FIG. Figure 2 The axial direction A and the radial direction R are drawn in.

[0028] Figure 1 and Figure 2An electric motor 1 designed as an external rotor is shown in an exploded view or in a sectional view, which is preferably provided and set up as a drive for a radiator fan of a motor vehicle. In particular, the three-phase (with three phases U, V, W) electric motor 1 has a stator 2 and a rotor 3 surrounding the stator and a motor carrier 4, which is also referred to as a carrier plate (plate-shaped or plate-shaped) in the following, and has an electronics compartment 5 that can be closed with an electronics compartment cover 6. The motor carrier 4 is preferably an aluminum 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 thereon.

[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 a certain number of sheet metal laminations 7a stacked to form a lamination pack. The stator 2 or its stator base body 7 has an annular base part 9 and stator teeth 10 formed thereon on the outside and pointing radially outward.

[0030] In the exemplary embodiment, coil insulators or winding insulators 11, 12 are respectively arranged on both stator sides of the stator base body 7 or the laminated core, which are also referred to below as the upper coil insulator 11 facing away from the motor carrier 4 and the lower coil insulator 12 facing the motor carrier 4. In other words, at least one coil insulator 12 is provided, which is arranged on the stator base body 7 of the stator 2 on the side facing the motor carrier 4. These coil insulators 11, 12, which are preferably made of plastic, for example, are each made as an injection-molded part, respectively cover the stator base body 7 and in particular the stator teeth 10 at or on the stator side. Preferably, the coil insulators 11, 12 each partially span the stator base body 7 or its stator teeth 10. The stator base body 7 of the stator 2 covered by the coil insulators 11, 12 is provided with a stator winding 8, which is preferably composed of coils 13 connected to each other, which are in turn wound onto the individual stator teeth 10 with the coil insulators 11, 12 as intermediate layers.

[0031] exist Figure 1 In the figure, the two coil insulators 11 and 12 are shown separately to make them clearly visible, and Figure 2 The actual installation of a stator base body 7 provided with coil insulators 11, 12 is shown. The stator base body is wound with coils 13 of a stator winding 8 with coil insulators 11, 12 as intermediate layers. The winding collars or winding ends 14 of the stator winding 8 are electrically conductively connected to busbar-like connecting contacts 15, which are contacted, for example welded, to contact pins 16. The contact pins 16 are or serve as phase contacts of the stator 2 or its stator winding 8.

[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 cast into the motor carrier 4 or arranged in a rotationally fixed manner (e.g. cast or pressed) in a pin receptacle of the motor carrier 4. The pin 17 approximately forms the rotation axis or motor axis D of the electric motor 1 or the rotor 3.

[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. The electronics compartment 5 opens into a plug compartment 20 at one end, in the exemplary embodiment, two of which are provided for connecting to the connecting cables 19 ( Figure 2 ) can be inserted into the plug compartment. In the installed state of the electric motor 1 , the electronics compartment 5 is sealed, in particular moisture-tight, by an electronics compartment cover 6 .

[0034] The rotor 3 has a pot-shaped rotor housing 23 with a housing bottom 23a and a housing wall (annular wall, housing wall) 23b oriented in the axial direction A. The permanent magnets 24 are arranged on the housing wall on the inner wall side. The rotor housing 23 has a housing section that is deep-drawn and preferably hollow-cylindrical in the center of the housing bottom 23a as a bearing housing 25 for two rolling bearings or ball bearings 26 that are axially spaced apart about the rotation axis D in the exemplary embodiment. Its outer ring, which is not further described, is held in a rotationally fixed manner in the deep-drawn bearing housing 25, and its inner ring, which is not further described, is firmly connected to the shaft bolt 17, wherein bearing balls (bearing elements or roller elements) 27 ( Figure 2 ).

[0035] Mounting elements 28 corresponding to the rotor housing 23, such as screws, are used to fasten an impeller (not shown) of a radiator fan to the rotor 3. Another fastening element 29 shown, such as screws or bolts, is used to fasten the stator 1 to the motor carrier 4.

[0036] Furthermore, a cuff-like or cork-like sealing element 30 can be seen for the contact pins 16 in order to seal them off relative to the motor carrier 4. For this purpose, the motor carrier 4 has corresponding through-openings 31, into which the sealing elements 30, which are penetrated by the contact pins 16, are inserted 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, so that three contact pins 16 are provided as phase connections of 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.

[0037] like Figure 2 It can be seen that 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 therein as the rotation axis D of the rotor 3. In addition, the contact pins 16 serving as phase connectors are also located in the receiving space 32. In addition, radial webs 33 serving as penetrations for the respective contact pins 16 extend into the receiving space 32. The radial webs are formed by several of the sheet metal laminations 7a of the stator base body 7 ( Figure 5 The insulating boss or insulating journal 34 preferably extends into the radial web 33 or its through-opening in a form-locking manner, and the respective contact pin 16 passes through the insulating boss 34. In particular, the hollow cylindrical insulating boss or insulating journal 34 is Figure 1 and Figure 2 An integral part of the lower coil insulator 12 in the embodiment, ie, preferably molded thereon.

[0038] refer to Figure 1 At least one further radial web 35 is formed by the stator base body 7 of the stator 2 or its sheet metal stack, which projects into the receiving space 32. The radial web 35 has a connection for the respective fastening element 29 or fastening pin. Figure 5 The through-openings further indicated in FIG. 1 and used to hold the stator 2 therewith and in particular to screw it to the motor carrier 4 .

[0039] The motor carrier 4 has a receiving groove 36, into which the electronics compartment cover 6 is inserted with its surrounding cover wall 6b. The receiving groove 36 is provided with or filled with a potting compound V, thereby establishing a reliable seal of the electronics compartment 5. The area of ​​the cover wall 6b of the inner plug part 21 into which the corresponding wall section is inserted and the plug compartment 20 are also provided with or filled with a sealing or potting compound V.

[0040] Figure 3 and Figure 4 The lower coil insulator or winding insulator 12 arranged on the stator base body 7 of the stator 2 on the side facing the motor carrier 4 is shown in different perspective views, in particular a top view or a bottom view or a rear view. It has an annular body 12a and radially (in the radial direction R, in a star shape) outwardly directed tooth caps 12b formed on its (outer) circumference. They cover the stator teeth 10 on the stator side facing the motor carrier 4 and at least partially cover their tooth flanks or side faces extending in the axial direction A. The tooth caps 12b of the lower coil insulator or winding insulator 12 have a cover cap section 37 extending in the plane of the annular body 12a and side cap sections 38 formed thereon, which extend radially and are oriented axially, or are oriented in the radial direction R and extend in the axial direction A along the side faces of the stator teeth 10.

[0041] The (lower) coil insulation or winding insulation 12 arranged on the stator base body 7 of the stator 2 on the side facing the motor carrier 4 has a number of radially inwardly directed webs 39 corresponding to the number of contact pins 16. These extend into the receiving or installation space 32 of the stator 2 or its stator base body 7 and are penetrated by the respective contact pin 16. The respective web 39 has an axially protruding hollow cylindrical insulating journal 34 on the side of the web 39 facing away from the motor carrier 4 (web side), which is penetrated by the respective contact pin 16. For this purpose, the web 39 or the insulating journal 34 formed thereon has corresponding through-openings 40.

[0042] The respective tab 39, which is preferably formed on the (lower) coil insulator or winding insulator 12, has a hollow cylindrical profile 41 on the tab side of the (lower) coil insulator or winding insulator 12 facing the motor carrier 4. The hollow cylindrical profile has an annular profile edge 42 for contacting the associated sealing element 30 and a through-opening 43 for the contact pin 16. The tab 39 is formed on the inner side or inner circumference on the annular edge 12c of the annular body 12a of the (lower) coil insulator or winding insulator 12.

[0043] exist Figure 2 and Figure 7 In the illustrated installed state (in which the stator 2 is fixed to the motor carrier 4 by means of the fastening element 29 and the web 39 of the (lower) coil insulator or winding insulator 12 rests on the sealing element 30 penetrated by the contact pin 16, preferably generating a preload acting on the sealing element 30), a molded part 41 molded on the respective web 39 of the (lower) coil insulator or winding insulator 12, axially oriented and penetrated by the respective contact pin 16, preferably rests on the associated sealing element 30 only with its annular molded part edge 42.

[0044] Figure 5 The stator 2 of the motor 1 is partially shown, and has a stator base body 7 with an annular base part 9 and stator teeth 10 formed on the outer circumference and pointing outward in the radial direction R, and the stator also has coils 13 of the stator winding 8 arranged on the stator teeth with upper and lower coil insulators 11, 12 as intermediate layers. The connecting contacts 15 (three connecting contacts in this embodiment) and the (phase) contact pins 16 contacting them can be seen. The stator base body 7 consists of sheet metal laminations 7a stacked to form a lamination stack. The connecting contacts 15 have preferably bent contact tabs (bent tabs) 44, in which or on which the coils 13 or the winding collars or winding heads 14 of the stator winding 8 are contacted, for example by means of laser welding and / or clamping.

[0045] The upper coil insulator 11 has functional elements in the form of fork-shaped holding or positioning elements 45 oriented in the radial direction R and projecting into the receiving or installation space 32 of the stator 2. They are used to hold and / or position the contact pin 16 on or relative to the connection contact 15 in its predetermined or prescribed target position so that it can be contacted with the contact pin at the corresponding contact position, for example by (laser) welding. The connection contact 15 is also held on the coil insulator 11, in particular by plug-in fastening.

[0046] exist Figure 5 , radial webs 33 for the associated contact pins 16 can be seen on the annular base part 9 of the stator base body 7, which are aligned with the through-openings 31 of the motor carrier 4. In the installed state, when the stator 2 is fixed to the motor carrier, the insulating pins 34 of the respective webs 39 of the (lower) coil insulation or winding insulation 12 are inserted, in particular in a form-fitting manner, into the through-openings of the associated radial webs 33 of the stator base body 7. In this state, the respective contact pin 16 penetrates the base-side radial webs 33 and the preferably hollow-cylindrical insulating pins 34 inserted therein and the preferably provided hollow-cylindrical molded part 41 of the associated webs 39 of the (lower) coil insulation or winding insulation 12. The hollow cylindrical insulating pin 34 and the hollow cylindrical molded part 41 , which is arranged on the side of the web 39 facing away from the insulating pin 34 and is preferably molded thereon like the insulating pin 34 , are axially oriented such that their through-openings 40 , 43 for the respective contact pin 16 are aligned with one another.

[0047] From the receiving or installation space 32, three (phase) contact pins 16 in contact with the connecting contacts 15 can be seen. A fastening web or radial web 46 formed by the sheet metal stack or laminated core 7a of the stator base body 7 is shown, which has a through opening 47 for a fastening element 29 for holding the stator 2 on the motor carrier 4 (on the motor carrier plate). Furthermore, a bolt receptacle 48 for the shaft bolt 17 in the motor carrier 4 is shown.

[0048] Figure 6The figure shows a view of the lower coil insulator 12, which has webs 39 oriented in the radial direction R and projecting into the installation space 32. Insulating pins 34 oriented in the axial direction A and thus protruding axially are formed on these webs, and the respective contact pins 16 pass through these insulating pins. The lower coil insulator 12 is formed by an annular body or inner ring 12a and tooth caps 12b formed on it on the outer circumference and extending outward in the radial direction R in a star shape (which are used to cover the stator teeth 10) and webs 39. The insulating pins 34 formed thereon and the contact pins 16 passing through them are axially raised on the side of the web 39 facing away from the motor carrier 4, while the molded part 41 formed on the web 39 on the opposite web side abuts against the sealing element 30.

[0049] Figure 7 The following diagram shows the area of ​​one of the sealing elements 30: Figure 2 , the sealing element is used for the contact pin 16 that passes through it and is introduced into the electronic device compartment 5. The through-opening 31 of the motor carrier 4, which is provided for accommodating the sealing element 30 for the contact pin 16, has a conical or conical (truncated cone) opening section 31a that tapers toward the electronic device compartment 5. The conical opening section 31a transitions into the (hollow) cylindrical opening part 31b of the through-opening 31 of the motor carrier 4, which leads into the electronic device compartment 5.

[0050] The respective sealing element 30 has a number of preferably circumferential, in particular axially spaced radial ribs 49 on the outer circumference. The respective sealing element 30 is preferably designed in a conical or truncated cone manner. In particular, due to the conical or truncated cone-shaped design of the carrier-side through-opening 31 or the sealing element 30 and preferably by means of its radial ribs 49, a reliable sealing in the manner of a labyrinth seal is achieved for the contact pin 16.

[0051] The radial webs 33 formed by the stator base body 7 or its sheet metal stack 7a have through-openings 50, into which the insulating pins 34 formed on the webs 39 of the lower coil insulator 12 are inserted in a form-fitting manner. In the illustrated installed state, the webs 39 of the (lower) coil insulator or winding insulator 12 are in contact with the radial webs 33 arranged on the annular base part 9 of the stator base body 7 on the one hand. On the other hand, the webs 39 of the (lower) coil insulator or winding insulator 12 are in contact with the respective sealing element 30 via the formed hollow cylindrical molded part 41. As a result, the compressive force or pressing force F generated by the fastening of the stator 2 to the motor carrier 4 acts on the respective sealing element 30, so that it is mechanically prestressed in a targeted manner. As a result, a high sealing performance is achieved in the region of the carrier-side through-portion 31 of the contact pin 16 introduced into the electronics compartment 5, without the need to provide additional components or parts for this purpose.

[0052] In summary, the present invention relates to an electric motor 1 having a motor carrier 4 and a stator 2 fastened thereto and a rotor 3 surrounding the stator, wherein a coil insulator or winding insulator 12 is arranged at least on the side of the stator 2 facing the motor carrier 4, wherein contact pins 16 are arranged in a receiving or installation space 32 of the stator 2, which are in contact with its stator winding 8 via a connecting contact portion 15 and are introduced into the electronic device compartment 2 on the carrier side via a sealing element 30 in a through-opening 31 of the motor carrier 4, and wherein the coil insulator or winding insulator 12 has a number of radially inwardly pointing webs 39 corresponding to the number of contact pins 16, which extend into the receiving or installation space 32 and are penetrated by the respective contact pins 16.

[0053] The claimed invention is not limited to the aforementioned embodiments. Rather, a person skilled in the art can also derive other variants of the invention from the scope of the disclosed claims without departing from the subject matter of the claimed invention. In addition, in particular, all individual features described in conjunction with different 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.

[0054] Reference numerals list

[0055] 1 Electric motor

[0056] 2 Stator

[0057] 3 Rotor

[0058] 4 Motor carrier / carrier plate

[0059] 5 Electronics compartment

[0060] 6 Electronics compartment cover

[0061] 6a Cover the bottom

[0062] 6b Cover wall

[0063] 7 Stator base

[0064] 7a Sheet metal stacking

[0065] 8 Stator winding / rotating field winding

[0066] 9 Base part

[0067] 10 stator teeth

[0068] 11 (Top) Coil insulator

[0069] 12 (lower) coil insulator

[0070] 12a Ring body / inner ring

[0071] 12b Tooth cap

[0072] 12c Ring edge

[0073] 13 Coil

[0074] 14 Winding ring / winding end

[0075] 15 Connecting contact part

[0076] 16 Contact pins

[0077] 17 Axle bolt

[0078] 18 Motor electronics / inverter electronics

[0079] 19 Connecting cables

[0080] 20 Plug compartment

[0081] 21 (Inner) plug part

[0082] 22 (Outer) plug part

[0083] 23 Rotor housing

[0084] 23a Shell bottom

[0085] 23b Housing wall / annular wall

[0086] 24 permanent magnets

[0087] 25 Housing section / bearing housing

[0088] 26 Rolling bearings / ball bearings

[0089] 27 Bearing Ball

[0090] 28 Mounting components

[0091] 29 Fastening elements

[0092] 30 Sealing element

[0093] 31 Through opening

[0094] 31a Conical / conical opening section

[0095] 31b Cylindrical opening section

[0096] 32 Accommodation space / installation space

[0097] 33 Radial tabs

[0098] 34 Insulation boss / insulation neck

[0099] 35 Radial tabs

[0100] 36 Receiving slot

[0101] 37 Block Section

[0102] 38 Side cap section

[0103] 39 splice

[0104] 40 Through opening

[0105] 41 Molding parts

[0106] 42 Edge of molded part

[0107] 43 Through opening

[0108] 44 Contact tab / bent tab

[0109] 45 Retaining element / positioning element

[0110] 46 Fastening tabs / radial tabs

[0111] 47 Through opening

[0112] 48 bolt receiving portion

[0113] 49 Radial ribs

[0114] 50 Through opening

[0115] A Axial direction

[0116] D Motor axis / rotation axis

[0117] F force (extrusion force or pressing force)

[0118] R Radial direction

[0119] V Potting / sealing material

Claims

1. An electric motor (1), in particular a radiator fan motor for a motor vehicle, comprising: a motor carrier (4) having an electronics compartment (5) for accommodating motor electronics (18); a stator (2) fastened to the motor carrier (4), the stator having a stator winding (8); and a rotor (3) which surrounds the stator (2) about an axis of rotation (D), - in, The stator (2) has a stator base body (7) having an annular base part (9) and radially outwardly directed stator teeth (10). - Among them, On the side of the stator (2) facing the motor carrier (4) or on the side of the stator (2) facing the motor carrier (4) and on the side facing the motor carrier (4) and facing away from the motor carrier (4), a coil insulator or a winding insulator (11, 12) is arranged on its stator base body (7). - wherein the annular base part (9) of the stator base body (7) forms a receiving or installation space (32), in which an axially oriented contact pin (16) is arranged, which is in contact or can be contacted with the stator winding (8) via a connecting contact (15), and which is introduced into the electronics compartment (2) via a sealing element (30) in a through-opening (31) of the motor carrier (4), and - wherein a coil insulation or winding insulation (12) arranged on the stator base body (7) of the stator (2) on the side facing the motor carrier (4) thereof has a number of radially inwardly directed webs (39) corresponding to the number of the contact pins (16), which protrude into the receiving or installation space (32) and are penetrated by the respective contact pins (16).

2. The electric motor (1) according to claim 1, It is characterized in that The stator (2) is fastened to a motor carrier (4) by means of a fastening element (29), wherein a web (39) of the coil insulation or winding insulation (12) bears against a sealing element (30) penetrated by the contact pin (16), in particular producing a preload acting on the sealing element (30).

3. The electric motor (1) according to claim 1 or 2, It is characterized in that The respective web (39) of the coil insulation or winding insulation (12) has a hollow cylindrical shaped part (41) which bears against the associated sealing element (30) and is penetrated by the respective contact pin (16).

4. The electric motor (1) according to any one of claims 1 to 3, It is characterized in that The respective web (39) of the coil insulation or winding insulation (12) has an axially projecting insulating pin (34) through which the respective contact pin (16) passes.

5. The electric motor (1) according to claim 4, It is characterized in that - the stator base body (7) has on the annular base body part (9) a radial web (33) which is aligned with the through-opening (31) of the motor carrier (4), the radial web having a through-opening (50) for an associated contact pin (16), and The insulating pins (34) of the respective webs (39) of the coil insulation or winding insulation (12) are inserted into the through-openings (50) of the associated radial webs (33) of the stator base body (7).

6. The electric motor (1) according to any one of claims 1 to 5, It is characterized in that A coil insulation or winding insulation (12) arranged on a stator base body (7) of the stator (2) on the side thereof facing the motor carrier (4) comprises an annular body (12a) and tooth caps (12b) for the stator teeth (10) which are molded on the annular body on the circumferential side, wherein the webs (39) are molded onto the annular body (12a) on the inner circumference.

7. The electric motor (1) according to claim 6, It is characterized in that The tooth cap (12b) has a top cap section (37) extending in the plane of the annular body (12a) and a side cap section (38) formed thereon, in particular extending radially and oriented axially.

8. The electric motor (1) according to any one of claims 1 to 6, It is characterized in that The stator base body (7) is formed as a laminated core consisting of a certain number of stacked sheet metal laminations (7a).

9. The electric motor (1) according to any one of claims 1 to 7, It is characterized in that - the through-opening (31) of the motor carrier (4) provided for receiving a sealing element (30) for the contact pin (16) has a conical or circular cone-shaped opening section (31a) which tapers toward the electronics compartment (5), and / or - the respective sealing element (30) has a certain number of radial ribs (49) on the outer circumference, and / or - The respective sealing element (30) is designed in the form of a cone or a truncated cone.

10. The electric motor (1) according to claim 9, It is characterized in that In the respective through-opening (31) of the motor carrier (4), a cylindrical opening section (31b) is connected to the conical or circular cone opening section (31a).

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