Electric machine with laminated core

Abstract

The invention relates to an electric machine (1) having a stator (2) which has a laminated core (8) with axially consecutive laminations (10). The invention relates to an electric machine (1) having a support structure (4) from which at least two pins (11) protrude axially and pass through a stacked core (8), the laminations (10) of the stacked core (8) having, for each pin (11), an associated lamination opening (13) with radially protruding teeth (15). The teeth (15) are in each case in contact with the associated pin (11), while the gap segments (18) in the associated lamination openings (13), which are located behind the teeth (15), are not in contact with the pins (11).

Description

Technical Field

[0001] The invention relates to an electric machine, in particular an electric motor for a fan, having a stator with a stacked core and a carrier structure to which the stator is fixed. Background Art

[0002] The electric machine has a rotor and a stator, which electromagnetically interact with each other during operation. In particular, such an electric machine is designed as an electric motor. The rotor rotates 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] The stator usually has a stacked core, also referred to as stacked core in the following. The stacked core has successive laminations along the axis of rotation. For example, windings for electromagnetic interaction can be wound around the stacked core. During operation, heat is generated in the stator and in particular in the stacked core, which can impair the operation of the motor.

[0004] Such motors are known, for example, from US Pat. No. 10,965,175 B2 and US Pat. No. 7,138,471 B2. Summary of the invention

[0005] The present invention is concerned with the problem of providing an improved or at least alternative embodiment for an electric machine of the type described above.

[0006] According to the invention, this problem is solved by the object of independent claim 1. Advantageous embodiments are object of the dependent claims.

[0007] Therefore, the present invention is based on the following basic idea: in an electric machine, a pin fixed to a bearing structure is guided through each associated guide structure of a stacked core, wherein the opening in the lamination of the stacked core formed with the guide structure has a protruding tooth that contacts the corresponding associated pin, and the lamination spaced from the tooth is spaced from the pin so as not to contact the pin. The protruding teeth enable reliable thermal and electrical contact between the stacked core and each pin, so that heat is reliably transferred from the stacked core and thus from the stator via the pin, and thus the stator is reliably cooled. The reliable contact between the stacked core and the pin further enables the stacked core and the pin to be equipotential. Therefore, compensation for unwanted electromagnetic interference is improved. Therefore, improved operation and electromagnetic compatibility of the motor are achieved. At the same time, the local non-contact arrangement of the laminations and each pin reduces the force required when the stacked core is joined to the pin. Therefore, on the one hand, at least the risk of damaging the stacked core is reduced, and in particular such damage is avoided. Therefore, the aforementioned contact between each lamination and the associated pin is reliably established, as is the case with the non-contact section, thereby improving heat dissipation and electromagnetic compensation. On the other hand, the reduction in the required force allows for a simpler and more precise manufacturing process for the motor.

[0008] According to the concept of the present invention, the motor has a rotor and a stator. The rotor rotates around the axially extending rotation axis of the motor during operation, and the axially extending rotation axis is also referred to as the motor axial direction hereinafter. The stator has a stacked core. The stacked core has axially consecutive laminations, in particular, is composed of axially consecutive laminations. The stator is fixed to a bearing structure. The motor has at least two pins spaced apart in the circumferential direction of the motor. The pin is fixed to the bearing structure and extends axially. The stacked core has an associated guide structure for each pin, and the pin passes through the guide structure. Each guide structure extends in an associated axial direction, which is also referred to as the guide structure axial direction hereinafter. Each guide structure has an associated opening in at least a portion of the laminations, wherein the opening is also referred to as the lamination opening hereinafter. Therefore, each pin passes through the lamination opening of the associated guide structure. Each pin contacts the lamination of the stacked core in the axial contact section of the pin. In the 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 associated guide structure axial direction. The respective tooth extends in a segment in the guide structure circumferential direction of the associated guide structure, the segment also being referred to as a tooth segment in the following, so that in the associated lamination opening, a spacing segment adjoining a tooth segment in the guide structure circumferential direction is free of teeth. The respective tooth contacts the associated pin, and a spacing segment adjoining the respective 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.

[0009] If each pin is thermally and electrically connected to a carrier structure, heat dissipation and electromagnetic compensation are more pronounced and improved. Advantageously, the carrier structure is thermally and electrically conductive and is grounded.

[0010] 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.

[0011] 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.

[0012] Therefore, "radial" is correspondingly referring to the associated axial direction.

[0013] 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.

[0014] 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.

[0015] The stacked core is used in particular for guiding the fields generated during operation of the electrical machine for electromagnetic interaction.To this end, at least one winding / coil of the stator may be wound around the stacked core.

[0016] Preferably, at least one of the guide structures, preferably each guide structure, 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 an associated lamination, in particular in an associated radially protruding tongue.

[0017] The pins are advantageously electrically conductive, for example made of metal or a metal alloy.

[0018] Each pin may be secured to the load-bearing structure in any manner.

[0019] Preferably, the respective pin is overmoulded with the load-bearing structure.The respective pin can be inserted into an injection mould as an insert and the load-bearing structure can then be manufactured by injection moulding such that the pin is fixed to the load-bearing structure and protrudes axially from the load-bearing structure.

[0020] For example, the support structure can be produced from metal or a metal alloy, such as aluminum, in particular by injection molding.

[0021] For example, the support structure can preferably have axially protruding ribs. This improves the heat dissipation of the electric machine, in particular the stator.

[0022] The rotor is supported so that it can rotate around the axial direction of the motor. 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.

[0023] The electrical machine is advantageously designed as an electric motor.

[0024] Electrical machines, in particular electric motors, can be used in any application.

[0025] In particular, the electric motor can be part of a fan, wherein the rotor is connected to fan blades of the fan.

[0026] 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 heat dissipation and electromagnetic compensation are improved.

[0027] Preferably, each tooth is formed, in particular bent, when the pin is guided through the associated lamination opening. Thus, the dimensions of the tooth and the pin are corresponding. Thus, 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 achieved more reliably. At the same time, the gap segments adjacent to the teeth advantageously deform the teeth and allow an advantageous deformation of the teeth, so that the contact is improved and precise. On the other hand, a reliable relative positioning of the stacked core and therefore the stator with respect to the pins and therefore a reliable relative positioning in the motor is therefore possible.

[0028] In a preferred embodiment, the stacked core is pressed axially onto the pin, so that the individual teeth bend and a press fit is created between the pin and the stacked core. Thus, the teeth not only make the thermal and electrical contact of the stacked core reliable, but also allow the stacked core to be fixed to the load-bearing structure and thus in the motor. Therefore, the pin also serves for positioning and can therefore also be referred to as a positioning pin.

[0029] Particularly preferred are embodiments in which the stator as a whole is positioned and fixed to the load-bearing structure by means of a 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 leads to a significant simplification of the manufacturing process of the electric machine and a significant reduction in the production cycle time, without the need for additional tools, devices or special positioning features.

[0030] 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 heat dissipation and electromagnetic compensation.

[0031] 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.

[0032] Each projection extends locally in the guide structure circumferential direction of the associated guide structure.

[0033] 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.

[0034] 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.

[0035] 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.

[0036] 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.

[0037] 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.

[0038] 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.

[0039] The motor has N such pins, where N is greater than or equal to two.

[0040] 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.

[0041] 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°.

[0042] Preferably, the opening offset and the lamination offset are opposite to each other.

[0043] 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.

[0044] 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°.

[0045] At least two laminations with teeth may be formed and manufactured, each lamination as a separately designed component.

[0046] 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.

[0047] 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.

[0048] 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.

[0049] 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.

[0050] 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

[0051] 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.

[0052] The accompanying drawings schematically show:

[0053] Figure 1 is the spatial view of the motor,

[0054] Figure 2 is a spatial exploded view of the motor's load-bearing structure, pins and stator with stacked cores,

[0055] Figure 3 is a cross-sectional view through the stacked core in the region of the guide structure,

[0056] Figure 4 is a top view of the laminations of the stacked core,

[0057] Figure 5 yes Figure 4 A magnified view of the area marked V in

[0058] Figure 6 yes Figure 4 A magnified view of the area marked VI in Figure 1.

[0059] Figure 7 yes Figure 4 A magnified view of the area marked VII in FIG.

[0060] Figure 8 is a spatially exploded view of a portion of the stacked core in the area of ​​the guide structure,

[0061] Fig. 9 is a top view of the guiding structure.

[0062] Fig.10 is the cross section through the pin,

[0063] Fig.11 yes Fig.10 A magnified view of the area marked XI in

[0064] Fig.12 is the spatial view of the pin,

[0065] Fig.13 is a cross-sectional view of the motor in the area of ​​the guide structure,

[0066] Fig.14 is a top view of the motor in the area of ​​the guide structure,

[0067] Fig.15 yes Fig.14 , but in another exemplary embodiment,

[0068] Fig.16 is a top view of a lamination of a stacked core in another exemplary embodiment,

[0069] Fig.17 yes Fig.16 A magnified view of the region marked XVII in FIG.

[0070] Fig.18 yes Fig.16 A magnified view of the region marked XVIII in

[0071] Fig.19 yes Fig.16 A magnified view of the region marked XIX in

[0072] 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,

[0073] Fig.21 is a cross-sectional view of the stacked core in the region of the guide structure,

[0074] Fig. 22 is a spatial view of a pin in another exemplary embodiment,

[0075] Fig.23 is a sectional view through the electric machine in the region of the guide structure of the stacked cores. DETAILED DESCRIPTION

[0076] 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 2An exploded view is shown, in which the bearing 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 axial direction AM of the electric machine 1, which axial direction AM is also referred to as the electric machine axial direction AM in the following. The rotation axis R of the rotor 3 is therefore coaxial with the electric machine axial direction AM. In the exemplary embodiment shown, the stator 2 is arranged radially on the outside of the rotor 3 relative to the electric machine axial direction AM and surrounds the rotor 3 in a circumferential direction CM of the electric machine 1, which circumferential direction CM is also referred to as the electric machine circumferential direction CM in the following. In the exemplary embodiment shown, the rotor 3 is mounted on the bearing structure 4 via bolts 6. The bolts 6 extend coaxially with the electric machine axial direction AM and are fixed to the bearing structure 4.

[0077] 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.

[0078] 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 The laminated core 8 is wound around the laminated core 8 (see Figure 1). The laminated core 8 has laminates 10 that are arranged one behind the other in the axial direction AM of the motor, so that the laminated core 8 has laminates 10 that are arranged one behind the other axially. The laminates 10 are electrically conductive at least in their core part, for example made of silicon steel. For example, Figure 2 As can be seen in FIG. 1 , the motor 1 also has at least two pins 11 , which are equidistantly spaced from each other in the motor circumferential direction CM. Fig.12 and Fig. 22 One 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 radially equidistantly spaced relative to the motor axial direction AM, i.e., arranged along an imaginary circle around the motor axial direction AM, the imaginary circle not shown. Each pin 11 is fixed to the supporting structure 4. In the exemplary embodiment shown, each pin 1 is overmolded by the supporting structure 4. That is, each pin 11 is inserted into an injection mold and overmolded with the material of the supporting structure 4. The bolt 6 can be fixed to the supporting structure 4 in the same way. In the exemplary embodiment and preferably, the supporting structure 4 and the pin 11 are both made of conductive material at least in their core. For example, the supporting structure 4 can be made of an aluminum alloy, while the pin 11 can be made of steel. Each pin 11 extends axially and thereby protrudes from the supporting structure 4. For each pin 11, the stacked core 8 has 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.

[0079] As will be explained below, 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. 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.23 It 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.

[0080] like Figure 2As shown by the arrow in , in the exemplary embodiment shown, the stacked core 8 is pressed onto the pin 11 so that a press fit structure is generated between the stacked core 8 and the pin 11. Due to the gap segment 18, the force required for the press fit is reduced, so that the manufacture of the motor 1 can be simplified and precise, and the cycle time is shortened. At the same time, the gap segment 18 allows a defined deformation of the tooth 15, so that reliable electrical and thermal contact exists between the stacked core 8 and the pin 11. Therefore, 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. Therefore, improved heat dissipation of the stacked core 8 and therefore improved heat dissipation of the stator 2 is achieved. In the exemplary embodiment shown, the supporting structure 4 also has axially protruding cooling ribs 19 for improved heat dissipation, as shown in 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.

[0081] In the exemplary embodiment shown, the stacked core 8 is also fixed to the carrier structure 4 and positioned in the motor 1 by means of a press-fit structure. Therefore, no screw connection is required for positioning and fixing the stacked core 8 and thus the stator 2. This allows further simplification of the manufacturing process of the motor 1 and further shortening of the manufacturing cycle.

[0082] 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.

[0083] 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.

[0084] 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.

[0085] 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, the individual projections 21 extend 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.

[0086] 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.

[0087] 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 axial direction (AM) of the motor, - having a stator (2) with a stacked core (8) with axially successive laminations (10), - having a bearing structure (4), to which the stator (2) is fixed, - having at least two pins (11) spaced apart in the circumferential direction (CM) of the motor, the at least two pins (11) being fixed to the bearing structure (4) and extending axially, -in, The stacked core (8) has, for each pin (11), an associated guide structure (12), through which the 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), - each of the pins (11) is in contact with the laminations (10) of the stacked core (8) in an axial contact section (14), - in the contact section (14), at least a portion of the lamination openings (13) each 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) contacts the associated pin (11), and the gap segment (18) following the tooth (15) in the associated lamination opening (13) along the guide structure circumferential direction (CG) of the associated guide structure (12) does not contact the associated pin (11).

2. The motor according to claim 1, 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.

3. The electric machine according to claim 1 or 2, It is characterized in that When the pin (11) is guided through the associated lamination opening (13), the individual teeth (15) are deformed, in particular bent.

4. The motor according to claim 3, It is characterized in that The stacked core (8) is pressed axially onto the pin (11) so that the teeth (15) bend and a press fit is created between the pin (11) and the stacked core (8).

5. The motor according to claim 4, It is characterized in that The stator (2) is positioned and fastened to the supporting structure (4) by means of the press-fit structure.

6. The electric machine according to any one of claims 1 to 5, 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).

7. The electric machine according to claim 6, It is characterized in that At least one of the pins (11), preferably each pin (11), has at least two such projections (21), which are spaced apart from one another in the circumferential direction (CG) of the associated guide structure.

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

9. The electric machine according to any one of claims 1 to 8, It is characterized in that The contact section (14) of at least one of the pins (11), preferably each pin (11), is smoothly formed, so that in the contact section (14), the tooth (15) is in contact with the pin (11).

10. The electric machine according to any one of claims 1 to 9, It is characterized in that Each lamination opening (13) has a single tooth (15).

11. The electric machine according to claim 9, It is characterized in that - 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).

12. The electric machine according to any one of claims 1 to 11, It is characterized in that Each lamination opening (13) has at least M teeth (15), between each of which a spacer (17) is arranged, and M is at least 2.

13. The electric machine according to claim 12, It is characterized in that - 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.

14. The electric machine according to claim 13, It is characterized in that Each lamination opening (13) has six teeth (15).

15. The electric machine according to any one of claims 1 to 14, 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.

16. The electric machine according to any one of claims 1 to 15, It is characterized in that The motor (1) has three pins (11).

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