Motor

Abstract

The invention relates to an electric machine (1), in particular an electric motor (1a), having a stator (2) and a carrier structure (4), the stator (2) being attached to the carrier structure (4). Simplified cost-effectiveness and precise manufacturing and reduced manufacturing cycle time are achieved by press-fitting the stator (2) on a pin (11) fixed to the bearing structure (4) and offset with respect to the axis (R) of rotation of the rotor (3) in order to fix and position the stator (2). The invention also relates to a method for producing such an electric machine (1).

Description

Technical Field

[0001] The invention relates to an electric machine, in particular an electric motor for a fan, having a stator and a support structure to which the stator is fixed. The invention also relates to a method for producing such an electric machine. Background Art

[0002] The electric machine has a stator and a rotor which electromagnetically interact during operation so that the rotor rotates relative to the stator about an axis of rotation. For reliable operation, the rotor and the stator must be positioned relative to each other, in particular coaxially. The positioning is usually achieved by fixing the stator to a supporting structure. For this purpose, the stator is usually positioned accordingly relative to the supporting structure, attached to the supporting structure and then fixed to the supporting structure by means of a screw connection.

[0003] Such an electric motor is known from WO 2019 / 002266 A1. The stator of the electric motor extends in a closed hollow cylindrical manner in the circumferential direction. The bearing structure has a bearing structure plate, wherein the stator is attached to the bearing structure plate of the bearing structure using a screw connection.

[0004] Other electric machines are known from US 10,965,175 B2 and US 7,138,471 B2. Summary of the invention

[0005] The present invention is concerned with the problem of providing improved or at least alternative embodiments for an electric machine of the type mentioned above and for a method for producing such an electric machine.

[0006] According to the invention, this problem is solved by the object of the independent claim. Advantageous embodiments are subject matter of the dependent claims.

[0007] Therefore, the present invention is based on the following basic idea: the stator of the motor is positioned and fixed to the load-bearing structure of the motor by means of a press-fit structure between the stator and pins fixed to the load-bearing structure and protruding from the load-bearing structure. Therefore, a reliable, stable and defined positioning and fixing of the stator in the motor is achieved. In addition, in this way, no other separate connecting devices (such as screws, etc.) are required to fix and position the stator to the load-bearing structure. Therefore, the fixing and positioning of the stator to the load-bearing structure is preferably without threaded connection. This simplifies the manufacturing process of the motor, improves cost-effectiveness, and shortens the manufacturing cycle of the motor. The press-fit structure between each pin and the stator further realizes direct contact between the stator and each pin. This allows heat to be transferred from the stator to each pin and thus to the load-bearing structure. Therefore, simplified and improved cooling of the stator is achieved.

[0008] According to the concept of the present invention, the motor has a rotor and a stator. The rotor rotates around the rotation axis of the motor in operation. The rotation axis extends parallel to the axial direction of the motor, in particular coaxially with the axial direction of the motor. The axial direction of the motor is also referred to as the motor axial direction hereinafter. The stator extends in the circumferential direction of the motor. The circumferential direction of the motor is also referred to as the motor circumferential direction hereinafter. The bearing structure extends radially relative to the axial direction of the motor. At least one pin is fixed to the bearing structure and protrudes axially from the bearing structure plate. The at least one pin is radially offset relative to the rotation axis. The stator is axially pressed onto at least one pin so that the stator is attached to each pin by means of a press-fit structure, wherein at least one press-fit structure positions the stator relative to the bearing structure and fixes the stator to the bearing structure. The press-fit structure to the axial pin further enables the stator to be centered with the bearing structure. This eliminates the need for additional tools, devices or special positioning features for centering purposes.

[0009] Preferably, the direct contact between each pin and the stator is thermally and electrically conductive. This allows improved heat transfer and equipotentiality of the portion of the stator and the each pin. Thus, improved cooling and improved compensation for undesired electromagnetic interference are achieved.

[0010] Particularly preferred are embodiments in which the stator as a whole is positioned and fixed to the support structure by means of at least one press-fit structure. Preferably, the positioning and fixing are achieved only by means of the press-fit structure. Thus, the stator is positioned and fixed in the electric machine without a screw connection. This greatly simplifies the manufacturing process of the electric machine and significantly shortens the production cycle time.

[0011] The individual pins are advantageously electrically conductive, for example made of metal or a metal alloy.

[0012] Cooling and electromagnetic compensation are more pronounced and improved if each pin is thermally and electrically connected to the carrier structure. Advantageously, the carrier structure is electrically conductive and electrically grounded.

[0013] For example, the support structure can have axially protruding ribs. This improves the heat dissipation of the electric machine, in particular the stator, so that better cooling is achieved.

[0014] The stator advantageously has a stack, also referred to below as a stacked core. The stacked core has successive laminations along the axis of rotation and thus has axially successive laminations. In particular, the stacked core consists of axially successive laminations. The stacked core is used in particular to guide the fields generated during operation of the electrical machine for electromagnetic interaction. To this end, at least one winding / coil of the stator can be wound around the stacked core.

[0015] The stator extends in the circumferential direction of the electric machine, is preferably closed, and further extends in the axial direction. The stator is thus shaped in the manner of a hollow cylinder.

[0016] The electrical machine is advantageously designed as an electric motor.

[0017] Electrical machines, in particular electric motors, can be used in any application.

[0018] In particular, the electric motor can be part of a fan, wherein the rotor is connected to fan blades of the fan.

[0019] The motor may have a single pin.

[0020] Preferably, the motor comprises at least two such pins, wherein the pins are spaced apart from each other in the circumferential direction of the motor. For example, the motor may have three pins. The pins preferably have the same radial distance to the axis of rotation. The pins preferably have the same circumferential distance from each other, i.e. are evenly distributed along the circumferential direction of the motor.

[0021] The rotor is supported so that it can rotate around the axis of rotation. The bearing can be mounted on the bearing structure, that is, the rotor can be relatively rotatably mounted on the bearing structure. To this end, axially extending bolts can be fixed to the bearing structure, and the rotor can be rotatably mounted on the bolts. Therefore, at least one pin is radially spaced from the bolts.

[0022] The method for manufacturing an electric machine preferably comprises providing a load-bearing structure assembly, a stator assembly and a rotor assembly. The load-bearing structure assembly comprises a load-bearing structure and at least one pin fixed to the load-bearing structure. The stator assembly at least partially comprises a stator. The rotor assembly at least partially comprises a rotor. For manufacturing, the stator assembly is axially press-fitted onto the at least one pin so that the stator assembly is positioned and fixed to the load-bearing structure. In addition, the rotor assembly can be fixed to the load-bearing structure in a relatively rotatable manner, in particular by using the bolts.

[0023] Each pin may be secured to the load-bearing structure in any manner.

[0024] Preferably, the individual pins are overmolded together with the load-bearing structure. The individual pins can be inserted as inserts into an injection mold, and the load-bearing structure can then be produced by injection molding, so that the pins are fixed to the load-bearing structure and protrude axially from the load-bearing structure. That is, the load-bearing structure is produced by injection molding. Here, at least one pin is inserted as an insert into an injection mold, and the load-bearing structure is then produced by injection molding, so that the at least one pin is fixed to the load-bearing structure and protrudes axially from the load-bearing structure.

[0025] The bolt can be fixed to the load-bearing structure like at least one pin. That is, the bolt can be used as an insert in an injection mold and then the load-bearing structure is manufactured by injection molding so that the bolt is fixed to the load-bearing structure and protrudes axially from the load-bearing structure.

[0026] The carrier structure is preferably electrically conductive.For example, the carrier structure may be made of metal or a metal alloy, such as aluminum, in particular by injection molding.

[0027] In a preferred embodiment, at least one of the at least one pin axially exceeds the stator with a section of the pin on a side remote from the support structure. The section is also referred to below as an extension section. That is, at least one of the at least one pin has an extension section, which extends axially beyond the stator on a side remote from the support structure. After the stator has been pressed onto the at least one pin, at least one of the at least one extension sections is deformed so that the extension section presses the stator axially against the support structure. Preferably, each pin comprises such an extension section and each extension section is deformed after the stator has been pressed onto the respective pin to press the stator axially against the support structure. This makes it possible to prevent or at least reduce axial play between the stator and the respective pins. Thus, an additional fixing and thus tightening of the stator to the support structure is achieved by still using the at least one pin.

[0028] The deformation of the respective extension section advantageously comprises radially enlarging the extension section.

[0029] Advantageously, the deforming of the respective extension section is performed after press-fitting the stator onto the at least one pin, and further preferably before attaching the rotor assembly.

[0030] In a preferred embodiment, the press-fit structure between the stator and each pin is a press-fit structure between the stacked core and each pin. That is, the stacked core is used to position and fix the stator to the bearing structure or each pin.

[0031] In an advantageous embodiment, the stator comprises an associated guide structure for each pin. Each guide structure extends axially, wherein each guide structure is pressed axially onto the associated pin to form a press-fit structure. This makes the manufacturing simpler and the positioning and fixing of the stator to the supporting structure more precise.

[0032] Preferably, the stacked core comprises at least one guiding structure.

[0033] According to an advantageous embodiment, the stacked core has an associated guide structure for each pin, wherein each pin passes through the associated guide structure. Each guide structure extends in an associated axial direction, which is also referred to as the guide structure axial direction in the following text. Each guide structure has an associated opening in at least one part of the laminations, wherein the opening is also referred to as the lamination opening in the following text. Thus, each pin passes through the lamination opening of the associated guide structure. In this case, the stacked core is axially pressed onto at least one pin in order to position the stator relative to the support structure and to fix the stator to the support structure fixing, wherein each pin contacts the stacked core in an axial contact section of the pin.

[0034] In a preferred embodiment, in at least one of the contact sections, preferably in each contact section, at least a portion of the lamination opening, preferably each lamination opening, has at least one tooth. Each tooth protrudes radially inward relative to the axial direction of the associated guide structure. Each tooth extends along the guide structure circumferential direction of the associated guide structure on the segment, which is also referred to as the tooth segment hereinafter, so that in the associated lamination opening, the interval segment adjacent to the tooth segment in the guide structure circumferential direction has no teeth. Each tooth is bent to form a press-fit structure and contacts the associated pin due to the press-fit structure. The gap segment adjacent to each tooth in the guide structure circumferential direction of the associated guide structure in the associated lamination opening does not contact the associated pin and is therefore spaced apart from the pin. The protruding teeth make reliable thermal and electrical contact between the stacked core and each pin, so that heat is reliably transferred from the stacked core and therefore from the stator via the pin, and therefore the stator is reliably cooled. The reliable contact between the stacked core and the pin further makes the stacked core and the pin equipotential. Therefore, compensation for unwanted electromagnetic interference is improved. At the same time, the locally contact-free arrangement of the laminations with the individual pins and thus with the gap segments results in a reduction in the forces required when pressing the stacked core onto the pins. Thus, on the one hand, the risk of damaging the stacked core is at least reduced and, in particular, such damage is avoided. Thus, the aforementioned contact between the individual laminations and the associated pins is reliably established, as is the case with the gap segments, which in turn improves cooling and electromagnetic compensation. On the other hand, the reduction in the required forces results in a simplified and more precise manufacturing process for the electric machine, which further reduces the cycle time for the manufacture of the electric machine.

[0035] As described above, each tooth bends when the pin is guided through the associated lamination opening. Therefore, the dimensions of the teeth and the pin are corresponding. Therefore, each tooth is preloaded against the associated pin. On the one hand, this obtains a reliable contact between each tooth and the associated pin, so that heat dissipation and electromagnetic compensation are more reliably achieved. At the same time, the gap segment adjacent to the tooth deforms the tooth advantageously and allows an advantageous deformation of the tooth, so that the contact is improved and precise. On the other hand, a reliable relative positioning of the stacked core and therefore the stator relative to the pin and therefore a reliable relative positioning in the motor is therefore possible without the need for additional tools, devices or dedicated positioning features.

[0036] The contact of each tooth with the associated pin in the present case means at least substantially continuous contact.Thus, the contact can be interrupted locally, for example due to a radial recess in the radial outer side in the contact section of the pin.

[0037] The motor axial direction and the guide structure axial direction are parallel to each other. Therefore, in the present case, "axial" means along one of the axial directions.

[0038] Therefore, "radial" is correspondingly referring to the associated axial direction.

[0039] Each circumferential direction is related to an associated axial direction, that is, it surrounds the associated axial direction. This means that the motor circumferential direction is related to the motor axial direction, and each guide structure circumferential direction is related to the associated guide structure axial direction.

[0040] The axial direction of each guide structure is advantageously coaxial with the associated pin. This means that the axial direction of each guide structure is suitably coaxial with the axis of the associated pin, in particular corresponds to the pin axis.

[0041] Preferably, at least one, preferably each, of the guide structures is formed in an associated radially protruding tongue of the stacked core, said tongue being spaced apart from at least one winding / coil of the stator. That is, each lamination opening is formed in a radially protruding tongue of the associated lamination, in particular in an associated radially protruding tongue.

[0042] In a preferred embodiment, axially consecutive teeth and spacing segments are arranged to be offset from each other in the circumferential direction of the guide structure of the associated guide structure, so that in the axial top view of the guide structure, the teeth of the laminations of each guide structure form a shoulder of the guide structure, which is closed in the circumferential direction of the guide structure and protrudes radially inward. Therefore, in the top view, the shoulder is closed in the circumferential direction of the guide structure of the associated guide structure. That is, the shoulder is not composed of tooth segments connected to each other in the circumferential direction. This arrangement of the teeth and therefore the shoulders has the effect that the individual pins are correspondingly connected to the stacked core in the circumferential direction of the guide structure of the associated guide structure in each angular segment. Therefore, the thermal and electrical connection of the stacked core to the individual pins is improved, and thus the cooling and electromagnetic compensation are improved.

[0043] A possible variant is that in which the contact section of at least one of the pins, preferably each pin, has at least one protrusion, which protrudes radially outward from the pin relative to the axial direction of the associated guide structure and extends axially. Each protrusion contacts at least two laminations of the associated guide structure in the contact section. Thus, the contact between the respective pin and the stacked core is increased. Each protrusion advantageously deforms the associated lamination. Thus, the contact is increased and more reliable, which in turn improves cooling and electromagnetic compensation.

[0044] According to the definition, the contact between the laminations and the respective projections occurs outside the gap segment. This means that the respective projections either contact the respective associated laminations in the tooth segment or interrupt the gap segment.

[0045] Each projection extends locally in the guide structure circumferential direction of the associated guide structure.

[0046] Preferably, at least one of the protrusions, preferably each protrusion, is formed as a radially protruding tip. This causes each lamination in contact with the tip to be deformed by the tip so that the tip holds and thus fixes the lamination axially and in the circumferential direction around the associated guide structure. This causes an increased and improved contact between the laminated core and the pin, as well as an improved and more stable positioning of the laminated core, in particular the stator, on the support structure.

[0047] At least one of the projections, in particular each projection, can be introduced into the contact section of the associated pin by means of spanning, for example by means of scoring. This produces a radial recess in the contact section, thereby forming a projection, in particular a tip. The recess is advantageously spaced apart from the laminations and therefore does not contact the laminations.

[0048] It is possible that at least one of the pins, preferably each pin, has at least two such projections, which are spaced apart from one another in the circumferential direction of the associated guide structure. Here, at least one projection of at least one pin can contact the tooth, and at least one projection contacts the lamination outside the tooth segment of at least one of the laminations.

[0049] If at least one of the pins has at least one such projection, the associated laminations can each have a single such tooth in the lamination opening.

[0050] It is possible that the contact section of at least one of the pins, preferably each pin, is smooth, so that only the tooth is in contact with the pin in the contact section. In this variant, each spacing section is therefore a gap section.

[0051] If at least one of the pins is smooth as explained, the associated lamination preferably has at least two teeth in the associated lamination opening which are spaced apart from one another in the circumferential direction of the associated guide structure.

[0052] The motor has N such pins, where N is greater than or equal to two.

[0053] Preferably, the electric machine has three such pins, which are preferably arranged equidistant from one another in the circumferential direction of the electric machine. Thus, there is a sufficiently high contact between the stacked core and the pins, and thus a sufficiently high cooling and electromagnetic compensation, while the design and manufacturing process of the electric machine are simplified. Furthermore, the stacked core, preferably the stator, can be reliably and precisely positioned and fixed in this way relative to the support structure and thus in the electric machine.

[0054] If each lamination opening has a single such tooth, each tooth segment is preferably 360° / N, i.e. each tooth extends 360° / N in the circumferential direction of the associated guide structure. In addition, the offset of the teeth of the lamination openings of each lamination that follow one another in the circumferential direction of the motor relative to the circumferential direction of the associated guide structure (hereinafter also referred to as the opening offset) is advantageously 360° / N. In addition, the offset of the teeth of the axially consecutive lamination openings of each guide structure (hereinafter also referred to as the lamination offset) is 360° / N. The extension and offset advantageously form the above-mentioned shoulder in each guide structure. For example, if the motor has three pins, i.e. N=3, each tooth segment is 120°, i.e. each tooth extends 120° in the circumferential direction of the associated guide structure. In addition, the teeth of the lamination openings of the lamination openings that follow one another in the circumferential direction of the motor of each lamination are offset from each other by 120°. Furthermore, the teeth of axially consecutive lamination openings of the respective guide structure are offset from one another by 120°.

[0055] Preferably, the opening offset and the lamination offset are opposite to each other.

[0056] Each lamination opening may have at least two teeth, and the spacing segments are respectively arranged between the at least two teeth. Therefore, the number M of teeth of each lamination opening is greater than or equal to 2, M≥2. Preferably, the teeth of each lamination opening are spaced apart from each other by a tooth offset of 360° / M in the circumferential direction of the associated guide structure. Advantageously, the teeth of the lamination openings of successive lamination openings of each lamination in the circumferential direction of the motor are offset from each other by an opening offset relative to the circumferential direction of the associated guide structure, and the opening offset is 360° / 2M. In addition, preferably, the teeth of axially consecutive lamination openings of each guide structure are offset relative to each other by a lamination offset of 360° / N. The protrusion advantageously causes the above-mentioned shoulder to be formed in each guide structure.

[0057] The number M of teeth of each lamination opening may be six, i.e. M=6. For three pins, i.e. N=3, this results in an advantageous variant in which the teeth of each lamination opening are spaced apart from one another by a tooth offset of 60° in the circumferential direction of the associated guide structure. Furthermore, the teeth of successive lamination openings of each lamination in the circumferential direction of the motor are offset from one another by an opening offset of 30° relative to the circumferential direction of the associated guide structure. Furthermore, the teeth of axially successive lamination openings of each guide structure are offset from one another by a lamination offset of 120°.

[0058] At least two laminations with teeth may be formed and manufactured, each lamination as a separately designed component.

[0059] In a preferred embodiment, at least two laminations with teeth in the stacked core, preferably all laminations with teeth in the stacked core, are designed as identical components. In this case, axially consecutive laminations are rotated relative to each other around the axial direction of the motor and are thus offset in the circumferential direction of the motor. The offset is also referred to as row offset hereinafter.

[0060] The row offset is preferably 360° / N. For three pins, ie N=3, axially consecutive laminations are therefore each offset by 120° relative to one another, so that every three laminations have lamination openings with identically oriented teeth.

[0061] It should be understood that the stacked core can also have stacks without stack openings and / or stack openings but without such teeth. In particular, at least one such stack can be arranged at the axial end face of the stacked core. At least one such stack can also be arranged between such stacks with teeth.

[0062] In fact, the scope of the present invention covers not only the electric machine but also the method for manufacturing the electric machine.

[0063] Further important features and advantages of the invention can be gathered from the dependent claims, the drawings and the description of the figures based on the drawings.

[0064] It is to be understood that the features mentioned above and those yet to be explained below can be used not only in the respectively indicated combination but also in other combinations or alone, without departing from the scope of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0065] Preferred exemplary embodiments of the invention are shown in the drawings and will be explained in more detail in the following description, wherein identical or similar reference numerals designate identical or similar or functionally identical components.

[0066] The accompanying drawings schematically show:

[0067] Figure 1 is the spatial view of the motor,

[0068] Figure 2 is a spatial exploded view of the motor's load-bearing structure, pins and stator with stacked cores,

[0069] Figure 3 is a cross-sectional view through the stacked core in the region of the guide structure,

[0070] Figure 4 is a top view of the laminations of the stacked core,

[0071] Figure 5 yes Figure 4 A magnified view of the area marked V in

[0072] Figure 6 yes Figure 4 A magnified view of the area marked VI in Figure 1.

[0073] Figure 7 yes Figure 4 A magnified view of the area marked VII in FIG.

[0074] Figure 8 is a spatially exploded view of a portion of the stacked core in the area of ​​the guide structure,

[0075] Fig. 9 is a top view of the guiding structure.

[0076] Fig.10 is the cross section through the pin,

[0077] Fig.11 yes Fig.10 A magnified view of the area marked XI in

[0078] Fig.12 is the spatial view of the pin,

[0079] Fig.13 is a cross-sectional view of the motor in the area of ​​the guide structure,

[0080] Fig.14 is a top view of the motor in the area of ​​the guide structure,

[0081] Fig.15 yes Fig.14 , but in another exemplary embodiment,

[0082] Fig.16 is a top view of a lamination of a stacked core in another exemplary embodiment,

[0083] Fig.17 yes Fig.16 A magnified view of the region marked XVII in FIG.

[0084] Fig.18 yes Fig.16 A magnified view of the region marked XVIII in FIG.

[0085] Fig.19 yes Fig.16 A magnified view of the region marked XIX in

[0086] Fig. 20 Is has Fig.16 A spatially exploded view of a portion of a stacked core of a lamination in the region of the guide structure,

[0087] Fig.21 is a cross-sectional view of the stacked core in the region of the guide structure,

[0088] Fig. 22 is a spatial view of a pin in another exemplary embodiment,

[0089] Fig.23 is a sectional view through the electric machine in the region of the guide structure of the stacked cores. DETAILED DESCRIPTION

[0090] like Figure 1 The electric machine 1 shown has a stator 2 and a rotor 3. The electric machine 1 also has a support structure 4, on which the stator 2 is fixed and positioned. Figure 2 An exploded view is shown, in which the support structure 4 and the stator 2 can be seen. During operation of the electric machine 1, the rotor 3 rotates relative to the stator 2 about an axis of rotation R, wherein in the exemplary embodiment shown, the axis of rotation R extends parallel to the axial direction AM of the electric machine 1, preferably, the axis of rotation R extends coaxially to the axial direction AM of the electric machine 1. The axis of rotation R is only Figure 1. The axial direction AM of the motor 1 is also referred to as the motor axial direction AM hereinafter. In the exemplary embodiment shown, the stator 2 is arranged radially outside the rotor 3 relative to the motor axial direction AM and surrounds the rotor 3 in a circumferential direction CM of the motor 1, which is also referred to as the motor circumferential direction CM hereinafter. In the exemplary embodiment shown, the rotor 3 is mounted on the support structure 4 via bolts 6. The bolts 6 extend coaxially with the rotation axis R and are fixed to the support structure 4.

[0091] In the exemplary embodiment shown, the electrical machine 1 is designed as an electric motor 1a, which is used for a fan 5. For this purpose, the fan blades 7 of the fan 5 are connected to the rotor 3 in a rotationally fixed manner.

[0092] For example, in Figure 2 , Figure 3 and Fig.21 As can be seen in FIG. 1 , the stator 2 has a stacked core 8, at least one winding 9 of the stator 2 (only in Figure 2 ) is wound around the stacked core 8. The stacked core 8 has stacked laminations 10 that are arranged one behind the other in the axial direction AM of the motor, so that the stacked core 8 has stacked laminations 10 that are arranged one behind the other axially. The stacked laminations 10 are electrically conductive at least in their core part, for example made of silicon steel.

[0093] For example, from Figure 2 As can be seen in FIG. 1 , the electric machine 1 has at least one pin 11 which is radially offset relative to the rotation axis R. In the exemplary embodiment shown, the electric machine 1 comprises at least two pins 11 which are equidistantly spaced from each other in the electric machine circumferential direction CM. Fig.12 and Fig. 22One such pin 11 is shown. In the exemplary embodiment shown, the motor 1 has three such pins 11, so that the number N of pins 11 is three, N=3. Each pin 11 is equidistantly spaced relative to the rotation axis R, and therefore each pin 11 is equidistantly spaced relative to the motor axial direction AM. That is, the pins 11 are arranged along an imaginary circle around the rotation axis R, which is not shown. Each pin 11 is fixed to the support structure 4. In the exemplary embodiment shown, each pin 1 is overmolded by the support structure 4. That is, each pin 11 is inserted into an injection mold and overmolded with the material of the support structure 4. The bolt 6 can be fixed to the support structure 4 in the same way. In the exemplary embodiment and preferably, the support structure 4 and the pin 11 are both made of an electrically conductive material at least in their core. For example, the support structure 4 can be made of aluminum, and the pin 11 can be made of steel. Each pin 11 extends axially and thereby protrudes from the support structure 4. The stator 2 is axially pressed onto at least one pin 11, so that the stator 2 is positioned relative to the support structure 4 and fixed to the support structure 4. That is, the stator 2 is attached to each pin 11 by means of a press-fit structure, so that at least one press-fit structure positions the stator 2 relative to the support structure 4 and fixes the stator 2 to the support structure 4. In the exemplary embodiment shown, the stacked core 8 is pressed onto each pin 11 to form the press-fit structure. That is, the positioning and fixing of the stator 2 to the support structure 4 are achieved using the stacked core 8. In addition, the fixing and positioning do not require a threaded connection. This allows the manufacturing process of the motor 1 to be further simplified and the manufacturing cycle to be further shortened.

[0094] In the exemplary embodiment shown, the stacked core 8 has for each pin 11 an associated guide structure 12 through which the pin 11 passes, such as, for example, from Figures 2 to 4 . Therefore, in the exemplary embodiment shown, the stacked core 8 has three such guide structures 12. Each guide structure 12 extends along an associated axial direction AG, which will also be referred to as the guide structure axial direction AG hereinafter. Therefore, each guide structure axial direction AG extends parallel to the motor axial direction AM, so that all axial directions AM, AG extend parallel to each other. The guide structure axial direction AG is radially spaced relative to the motor axial direction AM according to the arrangement of the pins 11, and is arranged equidistantly relative to each other along the motor circumferential direction CM. Each guide structure 12 has an associated opening 13 in at least a portion of the laminations 10, and in the exemplary embodiment shown, has an associated opening 13 in each lamination 10, which will also be referred to as the lamination opening 13 hereinafter. Therefore, each pin 11 passes through the lamination opening 13 of the associated guide structure 12.

[0095] In order to manufacture the electric machine 1, a supporting structure assembly 25, a stator assembly 26 and a rotor assembly 27 may be provided, such as Figure 1 and Figure 2 . The load-bearing structure assembly 25 comprises a load-bearing structure 4 and at least one pin 11 fixed to the load-bearing structure 4. In the exemplary embodiment shown, the load-bearing structure assembly 25 also comprises a bolt 6 fixed to the load-bearing structure 4. The stator assembly 26 at least partially comprises a stator 2. In the exemplary embodiment shown, the stator assembly 26 at least comprises a stacked core 8. The rotor assembly 27 at least partially comprises a rotor 3. For a better overview, the rotor assembly 27 is not shown in FIG. Figure 2 In addition, Figure 2 In FIG. 4 , the pins are shown at a distance from the load-bearing structure 4. Figure 2 As shown by the arrows in FIG. 1 , the stator assembly 26 is axially pressed onto the bearing structure assembly 25 by press-fitting the stacked core 8 onto at least one pin 11, thereby positioning and fixing the stator assembly 26 to the bearing structure 4. The rotor assembly 27 is relatively rotatably fixed to the bearing structure 4 using bolts 6.

[0096] As will be explained below, in the exemplary embodiment shown, each pin 11 is in contact with the laminations 10 of the stacked core 8 in an axially extending contact section 14 of the pin 11 (see also Fig.12 and 22 ). In the contact section 14, at least a portion of the lamination openings 13 each have at least one tooth 15 protruding radially inwardly relative to the associated guide structure axial direction AG. Each tooth 15 is bent to form an associated press-fit structure. In other words, each tooth 15 is bent due to the associated press-fit structure. In the exemplary embodiment shown, in the contact section 14, each lamination opening 13 has at least one tooth 15 protruding radially inwardly relative to the associated guide structure axial direction AG. Figure 4 and Fig.16 A top view of a lamination 10 with lamination openings 13 is shown, each of which has at least one such tooth 15. Figure 4 and Fig.16 As shown, each tooth 15 extends on the tooth segment 16 along the circumferential direction CG of the associated guide structure 12 (hereinafter also referred to as the guide structure circumferential direction CG). Therefore, the adjacent spacing segments 17 along the guide structure circumferential direction CG in the associated lamination opening 13 do not have teeth 15. For example, Fig.13 , Fig.14 as well as Fig.23It can be seen that each tooth 15 contacts the associated pin 11. Furthermore, the lamination opening 13 is spaced apart from the associated pin 11 in a gap segment 18 which is located behind each tooth 15 of the associated lamination opening 13 in the guide structure circumferential direction CG of the associated guide structure 12 and therefore does not contact the pin 11.

[0097] As described above, the stacked core 8 is pressed onto the pin 11 so that a press fit structure is created between the stacked core 8 and the pin 11. Due to the gap segments 18, the force required for the press fit is reduced, so that the manufacture of the electric motor 1 can be simplified and precise, and the cycle time is shortened. At the same time, the gap segments 18 allow a defined deformation of the teeth 15, so that reliable electrical and thermal contact exists between the stacked core 8 and the pin 11. As a result, heat can be transferred from the stacked core 8 to the pin 11 and via the pin 11 to the supporting structure 4 in a reliable and improved manner. As a result, improved cooling of the stacked core 8 and, therefore, improved cooling of the stator 2 is achieved. In the exemplary embodiment shown, the supporting structure 4 also has axially protruding ribs 19 for improving heat dissipation, as shown in FIG. Figure 2 The supporting structure 4 is grounded by means of an electrical connection, such as Figure 1 As shown. Therefore, the pin 11 is also grounded. The reliable electrical contact of the tooth 15 with the pin 11 provides a more reliable grounding of the stacked core 8. Therefore, undesirable electromagnetic interference in the stacked core 8 can be reduced / compensated in a simplified manner. Therefore, the operation and electromagnetic compensation and compatibility of the motor 1 are improved.

[0098] exist Figures 3 to 15 In the exemplary embodiment shown, each lamination opening 13 has a single tooth 15, such as Figures 4 to 7 can be seen in the summary. Figures 5 to 7 They are shown respectively Figure 4 An enlarged view of one of the lamination openings 13 of the lamination 10 is shown. In these exemplary embodiments, each tooth 15 extends over 120° in the associated guide structure circumferential direction CG, so the tooth segment 16 is 120°. In other words, the tooth segment is 360° / N, wherein the number of pins N is 3 and therefore the number of guide structures 12 N is three, as described above. As can be seen from Figures 4 to 7 It can also be seen that the teeth 15 of successive lamination openings 13 of each lamination 10 are offset from each other by a certain amount relative to the associated guide structure circumferential direction CG, which is also referred to as opening offset in the following. The opening offset is 120°, ie 360° / N. Figure 8 The axially successive lamination openings 13 of the guide structure 12 are shown. Figure 8 It can be seen that in Figures 3 to 15In the exemplary embodiment shown, the teeth 15 of axially consecutive lamination openings 13 of each guide structure 12 are offset from one another relative to the associated guide structure circumferential direction CG, which offset is also referred to as lamination offset in the following text. The lamination offset is 360° / N, i.e. 120°. Figures 4 to 8 As can be seen from the overview, the opening bias and the lamination bias are opposite to each other. Fig. 9 As shown, the axial top view of each guide structure 12 thus produces a shoulder 20 that projects radially inwards relative to the associated guide structure axial direction AG and is closed in the associated guide structure circumferential direction CG. Therefore, the teeth 15 of the lamination openings 13 of each guide structure 12 are offset relative to each other so that such a shoulder 20 is formed. Fig. 9 In FIG. 1 , one of the teeth 15 is shown with a solid line and the other teeth 15 are shown with different dashed lines to clearly show that the shoulder 20 is composed of teeth 15 that are axially offset from each other.

[0099] exist Figures 16 to 23 In the exemplary embodiment of the present invention, each lamination opening 13 has at least two teeth 15. Therefore, the number M of teeth 15 of each lamination opening 13 is at least 2, M≥2. In the exemplary embodiment shown, each lamination opening 13 has six teeth 15, that is, M=6. The teeth 15 of each lamination opening 13 are arranged equidistantly from each other in the associated guide structure circumferential direction CG. Therefore, in the exemplary embodiment shown, pairs of teeth 15 are arranged radially opposite to each other in each lamination opening 13 relative to the associated guide structure axial direction AG. The teeth 15 of each lamination opening 13 are also spaced apart from each other by spacer segments 17 in the associated guide structure circumferential direction CG. Figures 17 to 19 They are shown respectively Fig.16 An enlarged view of one of the lamination openings 13 of the lamination 10 is shown. Figures 16 to 19 As can be seen from the summary, Figures 16 to 23 In the exemplary embodiment shown, the teeth 15 of each lamination opening 13 are spaced apart from each other in the associated guide structure circumferential direction CG by a certain offset, which is also referred to as tooth offset in the following text. Therefore, the tooth offset corresponds to the extension of each spacing segment 17 in the associated guide structure circumferential direction CG. In the exemplary embodiment shown, the tooth offset is 60°, i.e. 360° / M. In addition, the opening offset, i.e. the offset of the teeth 15 of the lamination openings 13 of each lamination 10 that are consecutive in the motor circumferential direction AM relative to the associated guide structure circumferential direction CG is 30°, i.e. 360° / 2M. Fig. 20 The axially successive lamination openings 13 of one of the guide structures 12 are shown. Fig. 20As can be seen in the figure, the teeth 15 of the axially consecutive lamination openings 13 of each guide structure 12 are offset relative to each other by a lamination offset of 120° (ie 360° / N). Thus, in an axial top view (not shown), each guide structure 12 can produce a shoulder 20 (not shown) of the type described above.

[0100] In the exemplary embodiment shown, the laminations 10 of the stacked core 8 with the teeth 15 form identical components 24. In this case, axially consecutive laminations 10 are arranged rotationally relative to one another around the motor axial direction AM, i.e. with an offset in the motor circumferential direction CM. The offset, also referred to below as the row offset, is 120°. The row offset is therefore 360° / N.

[0101] like Figures 10 to 12 As shown, each pin 11 may have in the associated contact section 14 at least one projection 21 which projects radially outwards with respect to the associated guide structure axial direction AG. Fig.10 shows a radial section of the pin 11, Fig.11 Shows Fig.10 Enlarged view in the region of the projection 21, Fig.12 A spatial view of the pin 12 is shown. Fig.12 It can be seen that in the exemplary embodiment shown, each projection 21 extends axially over the entire extension of the contact section 14. Fig.11 As can be seen from the figure, in the exemplary embodiment shown, the projections 21 are preferably formed as radially protruding tips 22. In the exemplary embodiment shown, each projection 21, in particular each tip 22, is introduced into the pin 11 in a pressed manner, in particular by means of scoring, so that a recess 23 is formed adjacent to the projection 21, in particular adjacent to the tip 22. Fig.10 and Fig.12 As can be seen in summary, in the exemplary embodiment shown, the pin 11 has four such projections 21 which are arranged equidistantly from one another in the associated guide structure circumferential direction CG, that is to say two projections 21 are respectively arranged diametrically opposite one another.

[0102] Figures 10 to 12 The pin 11 shown in the exemplary embodiment is used exemplarily for Figures 3 to 15In the exemplary embodiment shown in . Here, each projection 21 is in contact with at least two laminations 10 of the associated guide structure 12. In the exemplary embodiment shown, in each lamination opening 13, one of the projections 21 of the associated pin 11 is in contact with the tooth 15 of the lamination opening 13, while the remaining projections 21 are spaced apart from the tooth 15 of the lamination opening 13. Thus, in the tooth segment 16, there is a locally limited interruption of the contact between the tooth 15 and the pin 11 in the region of the recess 23. Fig.14 In the exemplary embodiment of the present invention, the protrusion 21 spaced apart from the tooth 15 is completely spaced apart from the lamination opening 13 and thus completely spaced apart from the lamination 10 and thus does not contact the lamination 10. This means that in this exemplary embodiment, the spacing segment 17 corresponds to the gap segment 18. Fig.15 This projection 21 is shown in Fig.14 An enlarged view of the area marked XV in FIG. 1 , but in a different exemplary embodiment. Fig.15 In the exemplary embodiment of the embodiment of the present invention, the protrusion 21 at a distance from the tooth 15 also contacts the lamination opening 13. Therefore, the protrusion 21 spaced apart from the tooth 15 divides the spacing segment 17 into the gap segment 18.

[0103] exist Fig. 22 In the exemplary embodiment shown, the pin 11 is smooth in the contact section 14, ie in particular has no projections 21 and recesses 23 of the type described above. In the exemplary embodiment described, the individual spacing segments 17 therefore correspond to the gap segments 18 (see Fig.23 ). Fig. 22 The pin 11 shown in the exemplary embodiment is used exemplarily for Figures 16 to 23 In the exemplary embodiment shown in .

Claims

1. An electric machine (1), in particular an electric motor (1a) for a fan (5), - having a rotor (3) which, during operation, rotates about an axis of rotation (R), the axis of rotation (R) extending parallel to an axial motor direction (AM) of the motor (1), - having a stator (2), said stator (2) extending in the circumferential direction (CM) of the electric machine, - having a bearing structure (4) which extends radially with respect to the axial direction (AM) of the electric machine, -in, The stator (2) is attached to the carrier structure (4), It is characterized in that at least one pin (11) arranged radially offset relative to the axis of rotation (R) is fixed to the bearing structure (4) and projects axially from the bearing structure (4), - the stator (2) is axially pressed onto the at least one pin (11), so that the stator (2) is attached to the respective pin (11) by means of a press-fit structure, and so that the at least one press-fit structure positions the stator (2) relative to the supporting structure (4) and fixes the stator (2) to the supporting structure (4).

2. The motor according to claim 1, It is characterized in that The electric machine (1) comprises at least two, in particular three, such pins (11), which are arranged spaced apart from each other along a circumferential direction (CM) of the electric machine.

3. The electric machine according to claim 1 or 2, It is characterized in that The stator (2) comprises an axially extending associated guide structure (12) for each pin (11), each guide structure (12) being axially pressed onto the associated pin (11) to form such a press-fit structure.

4. The motor according to claim 3, It is characterized in that - the stator (2) has a stacked core (8) with axially successive laminations (10), - the stacked core (8) has, for each pin (11), an associated guide structure (12) of this kind, through which said pin (11) passes, - each guide structure (12) extends in an associated guide structure axial direction (AG) and has an associated lamination opening (13) in at least a portion of the laminations (10), so that each pin (11) passes through the lamination opening (13) of the associated guide structure (12), - the stacked core (8) is pressed axially onto at least one pin (11) so that the stacked core (8) is press-fitted to position the stator (2) relative to the supporting structure (4) and to secure the stator (2) to the supporting structure (4), - Each of the pins (11) is in contact with the stacked core (8) in an axial contact section (14) of the pin (11).

5. The motor according to claim 4, It is characterized in that - in each contact section (14), at least a portion of the lamination openings (13) have at least one tooth (15) protruding radially inwards with respect to the axial direction (AG) of the associated guide structure, - each tooth (15) extends on a tooth segment (16) in the guide structure circumferential direction (CG) of the associated guide structure (12) so that an adjacent spacing segment (17) in the guide structure circumferential direction (CG) in the associated lamination opening (13) is free of such a tooth (15), - each tooth (15) is bent to form a press-fit structure and contacts the associated pin (11) due to the press-fit structure, The gap segment (18) following the respective tooth (15) in the associated lamination opening (13) in the guide structure circumferential direction (CG) of the associated guide structure (12) is not in contact with the associated pin (11).

6. The motor according to claim 5, It is characterized in that Axially consecutive teeth (15) and spacer segments (17) are arranged offset from one another in a guide structure circumferential direction (CG) of the associated guide structure (12) so that, in an axial top view of the guide structure (12), the teeth (15) of the laminations (10) of at least one of the guide structures (12) form a shoulder (20) of the guide structure, which is closed in the guide structure circumferential direction (CG) and protrudes radially inward.

7. The electric machine according to any one of claims 4 to 6, It is characterized in that at least one of the pins (11), preferably each pin (11), has in the associated contact section (14) at least one projection (21), which projects radially outwards relative to the associated guide structure axial direction (AG) and extends axially, Each projection (21) in the contact section (14) is in contact with at least two laminations (10) of the associated guide structure (12).

8. The electric machine according to claim 7, It is characterized in that In at least one guide structure (12), at least one protrusion (21) is in contact with a tooth (15), and at least one protrusion (21) is in contact with at least one tooth (15) spaced apart from the lamination opening (13) in the circumferential direction (CG) of the associated guide structure.

9. The electric machine according to any one of claims 4 to 8, It is characterized in that - each lamination opening (13) has a single tooth (15), - the electric machine (1) has N pins (11), the N pins (11) being equidistant from one another in the circumferential direction (CM) of the electric machine, -Each tooth segment is 360° / N, - the teeth (15) of the lamination openings (13) of the respective laminations (10) which are consecutive in the circumferential direction (CM) of the motor are offset from one another by an opening offset of 360° / N relative to the circumferential direction (CG) of the associated guide structure, The teeth (15) of axially consecutive lamination openings (13) of each guide structure (12) are offset relative to one another by a lamination offset of 360° / N relative to the associated guide structure circumferential direction (CG).

10. The electric machine according to claim 4-8, It is characterized in that - each lamination opening (13) has at least M teeth (15), between each of which a spacer (17) is arranged, M being at least 2, - the electric machine (1) has N pins (11), the N pins (11) being equidistant from one another in the circumferential direction (CM) of the electric machine, - the teeth (15) of each lamination opening (13) are spaced apart from one another in the associated guide structure circumferential direction (CG) by a tooth offset of 360° / M, - the teeth (15) of the lamination openings (13) of successive lamination openings (13) of the respective laminations (10) in the circumferential direction (CM) of the motor are offset from one another by an opening offset relative to the circumferential direction (CG) of the associated guide structure, the opening offset being 360° / 2M, The teeth (15) of axially consecutive lamination openings (13) of each guide structure (12) are offset from one another by a lamination offset of 360° / N.

11. The electric machine according to any one of claims 4 to 10, It is characterized in that The laminations (10) with teeth (15) of the stacked core (8) are formed as identical parts (24), axially consecutive laminations (10) being arranged so as to be rotated relative to one another about an axial direction (AM) of the motor.

12. A method for producing an electric machine (1) according to any one of the preceding claims, wherein: - providing a load-bearing structure assembly (25), said load-bearing structure assembly (25) comprising a load-bearing structure (4) and at least one pin (11) fixed to the load-bearing structure (4), - providing a stator assembly (26), said stator assembly (26) at least partially comprising a stator (2), - providing a rotor assembly (27) which at least partially comprises the rotor (3), - the stator assembly (26) is axially press-fitted onto the at least one pin (11) of the load-bearing structure assembly (25), so that the stator assembly (26) is positioned and fixed to the load-bearing structure assembly (25), The rotor assembly (27) is fixed to the load-bearing structure assembly (25) in a relatively rotatable manner.

13. The method according to claim 12, It is characterized in that - the load-bearing structure (4) is manufactured by injection molding, The at least one pin (11) is inserted as an insert into an injection mold and then the bearing structure (4) is manufactured by injection molding so that the at least one pin (11) is fixed to the bearing structure (4) and protrudes axially from the bearing structure (4).

14. The method according to claim 12 or 13, It is characterized in that - providing a stator assembly (26) having a stacked core (8) according to any one of claims 4 to 12, - the stacked core (8) is axially press-fitted onto the at least one pin (11) of the load-bearing structural assembly (25).

Images