Electric motor with a fan and a fan cover

Abstract

The invention relates to an electric motor with a fan and a fan cover, wherein the electric motor comprises a stator housing, a bearing plate and an angle sensor, wherein the stator housing is connected to the bearing plate, wherein a bearing,m in particular a ball bearing, is accommodated in the bearing plate for mounting the rotor shaft of the electric motor, wherein the angle sensor is secured to an adapter flange, wherein the adapter flange is secured to the bearing plate.

Description

[0001] Electric motor with fan and fan cover

[0002] Description:

[0003] The invention relates to an electric motor with a fan and fan cover.

[0004] It is common knowledge that a fan is used to cool devices.

[0005] From DE 10 2008 028 658 A1, the closest state of the art is an electric motor with a sensor.

[0006] An electric motor with a stator housing is known from DE 10 2022 001 255 A1.

[0007] From De 102022 001 256 A1 an electric motor with a rotor shaft, a stator housing and a bearing flange is known.

[0008] An electric motor with an electromagnetically actuated brake is known from DE 10 2022 000 375 A1.

[0009] An inverter motor with a fan cover is known from DE 10 2007 034 913 A1.

[0010] A speed sensor device is known from DE 31 22 655 C2.

[0011] The invention is therefore based on the object of developing an electric motor with a fan and fan cover, wherein an angle sensor is to be integrated in the electric motor.

[0012] According to the invention, the object is achieved in the electric motor according to the features specified in claim 1.

[0013] Important features of the invention in the electric motor with fan and fan cover are that the electric motor has a stator housing, a bearing plate and an angle sensor, wherein the stator housing is connected to the bearing plate,

[0014] IRI \ FIDOPAT 151 1 1 707 1 wherein a bearing, in particular a ball bearing, for supporting the rotor shaft of the electric motor is accommodated in the bearing shield, wherein the fan wheel is connected to the rotor shaft in a rotationally fixed manner, wherein the angle sensor is fastened to an adapter flange which functions in particular as a torque support, wherein the adapter flange is fastened to the bearing shield and / or is connected to an intermediate ring which is connected to the bearing shield, wherein the fan wheel is arranged within, in particular radially and axially within, the adapter flange, wherein a cheek section of the adapter flange has axially through holes, in particular circular holes, in particular circular hole bores,

[0015] - which cover a radial distance range which is arranged at least partially radially outside the radial distance range covered by the stator of the angle sensor, and / or which are arranged radially outside a hole pattern arranged on the cheek section for fastening the angle sensor, in particular wherein screws passing through holes in the hole pattern of the cheek section pass through the stator of the angle sensor, in particular with which the stator of the angle sensor is fastened to the adapter flange.

[0016] The advantage here is that the adapter flange creates a stable mechanical interface for connecting to different angle sensors. For example, for larger angle sensors, the adapter flange can be equipped with a different, particularly larger, hole pattern on the side facing the angle sensor. This means that the electric motor can still be used. Overall, the invention allows for a high variety of electric motors to be achieved with a small number of parts. The end shield of the electric motors remains unchanged, i.e., always structurally identical. Nevertheless, different angle sensors can be integrated into the electric motor via appropriately adapted adapters.

[0017] A component, in particular a coupling, is also arranged between the rotor shaft of the electric motor and the rotor of the angle sensor, which enables a mechanical interface that allows for high variance with a small number of parts.

[0018] In an advantageous embodiment, the area covered in the axial direction by the fan cover comprises the area covered in the axial direction by the adapter flange and / or comprises the area covered in the axial direction by the angle sensor. Advantageously, the angle sensor and the adapter flange, and thus also the components enclosed by the adapter flange, are arranged within the fan cover.

[0019] In an advantageous embodiment, the fan cover is radially spaced from the angle sensor and the adapter flange, in particular, the angle sensor and the adapter flange are arranged radially within the fan cover. It is advantageous that the angle sensor and the adapter flange, and thus also the components surrounded by the adapter flange, are arranged within the fan cover.

[0020] In an advantageous embodiment, the adapter flange has a ring section, web sections and the cheek section, wherein the web sections connect the ring section to the cheek section, wherein the web sections are spaced apart from one another in the circumferential direction, wherein the ring section is fastened to the bearing plate, in particular wherein the ring axis of the ring section is aligned coaxially to the axis of rotation of the rotor shaft, in particular wherein the cheek section is designed as a flat disk whose normal direction is aligned coaxially to the axis of rotation of the rotor shaft, in particular so that through-holes are formed in the circumferential direction between the web sections through the adapter flange. The advantage here is that a high torsional rigidity can be achieved and thus the adapter flange functions as a torque support for the angle sensor.

[0021] In an advantageous embodiment, the stator of the angle sensor is connected to the cheek section. This is advantageous because different hole patterns can be incorporated into the cheek section, thus supporting a large surface area for connecting many different angle sensors.

[0022] In an advantageous embodiment, the rotor of the angle sensor is connected in a rotationally fixed manner to a bolt, in particular a screw bolt, via a coupling, in particular a slotted coupling. The bolt is rotationally fixedly connected to the rotor shaft, in particular the bolt is screwed into a threaded bore in the rotor shaft, and the coupling is designed as a hollow shaft provided with slots. The advantage here is that, on the one hand, mechanical compensation is achieved by means of the coupling and, on the other hand, a mechanical interface is provided, so that different angle sensors can be connected.

[0023] In an advantageous embodiment, the cheek section is designed in the shape of a perforated disk, wherein the coupling projects axially through a hole in the cheek section arranged centrally in the cheek section, in particular wherein the area covered by the cheek section in the axial direction is encompassed by the area covered by the coupling in the axial direction. The advantage here is that simple production is possible. In an alternative advantageous embodiment, the coupling is arranged within the adapter flange, in particular wherein the area covered by the coupling in the axial direction is encompassed by the area covered by the adapter flange in the axial direction. The advantage here is that the coupling is arranged in a protected manner.

[0024] In an advantageous embodiment, the cheek section has a hole pattern for screws or the screws that fasten the stator of the angle sensor to the cheek section. Advantageously, the screws or the hole pattern are arranged radially within the holes provided for the intake air flow. Thus, the air flow also flows past the angle sensor and cools it.

[0025] In an advantageous embodiment, the cheek section is designed in the shape of a perforated disk. This is advantageous because hole patterns can be arranged at varying radial spacing. Furthermore, the cheek section is designed in a disk-like manner, making it solid and rigid, while also offering a high thermal capacity to dissipate the heat loss generated by the angle sensor.

[0026] In an advantageous embodiment, the flange section has a hole pattern for screws that secure the angle sensor's stator to the flange section. This provides a high thermal capacity for dissipating the power loss generated by the angle sensor and a rigid base for securely attaching the angle sensor's stator.

[0027] In an advantageous embodiment, the bearing shield has boss areas that project radially outwards, into which boss areas in particular radially directed threaded holes are made, wherein screws are screwed into the threaded holes, which extend through the fan cover and whose respective screw heads press the fan cover towards the respective boss area. The advantage here is that the boss areas enable a clear space between the fan cover and the bearing shield, through which the air flow conveyed by the fan flows out to the cooling fins. In an advantageous embodiment, the air flow flowing out of the space surrounded by the fan cover between the fan cover and the bearing shield flows along the cooling fins. The advantage here is that efficient cooling is enabled. In particular, the radial distance area covered by the clear space overlaps the radial distance area covered by the cooling fins.

[0028] In an advantageous embodiment, the coupling is arranged within the adapter flange, with the area covered by the coupling in the axial direction being contained within the area covered by the fan cover in the axial direction. This is advantageous because the coupling is arranged in a mechanically protected manner.

[0029] In an advantageous embodiment, the air flow drawn in by the fan impeller passes through grille openings in the fan cover, in particular, the grille openings being formed on the end face of the fan cover axially facing away from the stator housing. An advantage here is that the fan cover, including the fan, can be designed as a pre-assembled unit.

[0030] In an advantageous embodiment, a first terminal box is arranged and / or attached to the stator housing. This is advantageous because it allows for easily accessible electrical connections.

[0031] In an advantageous embodiment, the fan wheel is arranged in the space surrounded by the adapter flange,

[0032] In an advantageous embodiment, the fan wheel is located within the adapter flange. This is advantageous because the fan wheel can be positioned in a space-saving and protected manner.

[0033] In an advantageous embodiment, a cover part covers a recess in the fan cover, wherein the area covered by the recess in the axial direction is encompassed by the area covered by the coupling in the axial direction. Advantageously, the coupling can be connected to a tool through the recess, in particular by actuating clamping screws or fastening screw parts of the coupling.

[0034] In an advantageous embodiment, the holes in the cheek section are designed as circular holes, in particular as axially continuous circular holes. This is advantageous because it enables simple and cost-effective production.

[0035] In an advantageous embodiment, the area covered by the coupling in the axial direction is contained within the area covered by the fan cover in the axial direction. Advantageously, the coupling is arranged in a manner protected by the fan cover and at least partially by the adapter flange.

[0036] In an advantageous embodiment, the air flow drawn in by the fan impeller passes through the grille openings in the fan cover and through the holes in the cheek section, in particular, the grille openings being formed on the end face of the fan cover axially remote from the stator housing and / or the holes being formed on the end face of the adapter flange axially remote from the stator housing. This advantageously dissipates heat from the adapter flange and allows the fan impeller to be arranged in a protected manner within the adapter flange.

[0037] In an advantageous embodiment, cooling fins project radially outward on the stator housing, particularly those extending axially. This is advantageous because it enables efficient heat dissipation.

[0038] In an advantageous embodiment, a clearance is formed between two circumferentially adjacent protrusion areas. This clearance is defined radially inward by the bearing plate and radially outward by the fan cover and / or through which the airflow conveyed by the fan impeller exits to the cooling fins. The radial clearance area covered by the cooling fins overlaps with the radial clearance area covered by the clearance. This advantageously allows the airflow conveyed by the fan to enter the area of ​​the cooling fins directly and then flow further along the cooling fins.

[0039] Further advantages emerge from the dependent claims. The invention is not limited to the combination of features in the claims. Further possible combinations of claims and / or individual claim features and / or features of the description and / or the figures will become apparent to those skilled in the art, particularly from the problem and / or the problem posed by comparison with the prior art.

[0040] The invention will now be explained in more detail using schematic illustrations:

[0041] Figure 1 shows an electric motor according to the invention in an oblique view and exploded.

[0042] Figure 2 shows an adapter flange 5 in an oblique view.

[0043] Figure 3 shows an intermediate ring 8 in an oblique view.

[0044] Figure 4 shows a fan cover 6 in an oblique view.

[0045] Figure 5 shows a fan wheel 10 in an oblique view.

[0046] Figure 6 shows a coupling 13 in an oblique view.

[0047] Figure 7 shows an angle sensor of the electric motor in an oblique view.

[0048] Figure 8 shows a bolt 10 of the electric motor in an oblique view.

[0049] In Figure 9, the electric motor according to the invention is shown in an oblique view and exploded.

[0050] As shown in the figures, the electric motor has a stator housing 1 which has cooling fins projecting radially outwards on its radial outer circumference and extending in the axial direction.

[0051] At a first axial end of the stator housing 1, a bearing plate 3 is connected to the stator housing 1, which receives a bearing for the rotatable support of the rotor shaft 11 of the electric motor.

[0052] The axial direction is parallel to the direction of the rotation axis of the rotor shaft 11. The radial

[0053] The axial direction and the circumferential direction are each related to the rotational axis of the rotor shaft 11. A fan wheel 10 is mounted on the end of the rotor shaft 11 that protrudes axially from the front of the stator housing and is connected to the rotor shaft in a rotationally fixed manner, preferably by means of a keyway. The end of the rotor shaft 11 facing away from the stator housing is connected to a first side of the coupling 13, which connects the rotor of the angle sensor to the rotor shaft 11 in a rotationally fixed manner.

[0054] The stator of the angle sensor is connected to the adapter flange 5, which acts as a torque support. For this purpose, the stator of the angle sensor is connected to a cheek section 22 of the adapter flange 5 by means of screws. This cheek section is connected via circumferentially spaced web sections 21 to a ring section 20. The ring section 20, in turn, is fastened by screws to the intermediate ring 8, which is connected to the bearing plate 3.

[0055] The coupling 13 is enclosed by the adapter flange 5. For this purpose, the axial area covered by the coupling 13 is enclosed by the axial area covered by the adapter flange 5.

[0056] Likewise, the fan wheel 10, which is arranged within the adapter flange 5, is encompassed by the adapter flange 5. For this purpose, the axial area covered by the fan wheel 10 in the axial direction is encompassed by the axial area covered by the adapter flange 5.

[0057] The intermediate ring 8 is detachably connected to the bearing plate 3.

[0058] A fan cover 6 is placed over the angle sensor including the adapter flange 5 and also over the bearing plate 3 including the protrusions 2 formed on the bearing plate and projecting radially from the bearing plate 3. A radially directed threaded hole is provided in each of the protrusions 2, into which a screw is screwed, passing through the fan cover 6. The screw head rests against the radial outer side of the fan cover 6 and presses it against the respective protrusion 2.

[0059] The area covered by the fan cover in the axial direction includes the area covered by the angle sensor, the area covered by the adapter flange 5, and at least partially also the area covered by the bearing plate 3 in the axial direction. The fan cover 6 is radially spaced from the adapter flange 5 and the angle sensor 9.

[0060] On its end face axially remote from the stator housing 1, the fan shroud 6 has continuous grille openings 7, so that an air flow sucked in by the fan wheel 10 in the axial direction enters through the grille openings 7 and flows past the angle sensor, in particular between the stator 9 of the angle sensor and the fan shroud 6, and / or through holes which are formed axially through the cheek section 22, to the fan wheel 10 arranged within the adapter flange. The air flow conveyed in the radial direction by the fan wheel 10 then exits in the radial direction from the adapter flange 5 between the web sections 21 and then from the space surrounded by the fan shroud 6 to the cooling fins of the stator housing 1, wherein the cooling fins extend in the axial direction.

[0061] The fan wheel 10 is arranged in the space surrounded by the fan cover 6, in particular by the adapter flange 5.

[0062] Preferably, the bump regions 2 are all at the same axial position and all at the same radial distance, but spaced from each other in the circumferential direction.

[0063] The fan cover 6 has a continuous recess 40 that can be covered by a cover part 4. Maintenance can be performed through the recess 40 and / or electrical cables of the angle sensor can be passed through.

[0064] The stator winding of the electric motor is connected to electrical contacting elements which are arranged in a terminal box 12 which is attached and / or fastened to the outside of the stator housing 1.

[0065] The adapter flange 5 provides a mechanical interface for connecting various types of angle sensor stators. The coupling 13 also provides an interface on the rotating part. Therefore, a series of electric motors can be provided, each of which has different angle sensors. A high variety of electric motors can thus be provided with only a small number of components.

[0066] The fan wheel 10 is arranged inside the fan cover 6 and inside the adapter flange 5.

[0067] According to the invention, the adapter flange 5 is also cooled by the air flow. Furthermore, the air flow passes through the continuous recesses of the adapter flange 5 defined by the web sections 21 and also carries away heat loss from the bearing of the electric motor's rotor shaft.

[0068] Axially through holes 23 are arranged in the cheek section 22 of the adapter flange, through which the air flow is drawn in. The holes 23 are all arranged at the same radial distance and spaced from one another in the circumferential direction, in particular at regular intervals. The holes are in particular of a similar shape and / or each designed as a round bore, in particular a circular bore.

[0069] In particular, the radial distance range covered by the holes 23, in particular the range that includes all radial distances of the holes, is arranged radially outside the radial distance range covered by the angle sensor.

[0070] The area covered by the fan wheel 10 in the axial direction is encompassed by the area covered by the adapter flange 5 in the axial direction.

[0071] Preferably, the distance between the cheek section 22 and the fan cover 6 is as small as possible or disappears completely. For this purpose, a radial projection of the cheek section 22 on the adapter flange 5 is advantageous. This prevents backflow of eddies in the air flow or mixing of the intake and discharged air flow.

[0072] To achieve a compact design, the radial clearance between the fan cover 6 and the adapter flange 5 is very small. Thus, the air flow enters through the holes 23 in an axial direction and is then deflected radially by the fan impeller 10. The radial clearance area covered by the fan impeller 10 overlaps the radial clearance area covered by the holes 23.

[0073] The air conveyed by the fan wheel 10 in the radial direction passes through the circumferential direction between the web sections 21 and is then deflected by the fan cover 6 in the axial direction in order to exit between the fan cover 6 and the bearing plate 3 in the axial direction and to flow along the cooling fins.

[0074] In further embodiments of the invention, the coupling 13 is designed as a slotted coupling. This is produced by slots formed in a hollow shaft, each slot being arranged in a plane, in particular a slotted plane, and the planes being axially spaced from one another, with the planes all being aligned parallel to one another.

[0075] Preferably, in the respective plane, each slot is designed such that only a single web bridges the respective slot or that only two webs bridge the respective slot.

[0076] In further embodiments according to the invention, the intermediate ring 8 and the bearing plate 3 are designed as one piece, i.e. in one part.

[0077] List of reference symbols

[0078] 1 stator housing

[0079] 2 hump area

[0080] 3 bearing plate

[0081] 4 Cover part

[0082] 5 Adapter flange

[0083] 6 Fan cover

[0084] 7 grille openings

[0085] 8 intermediate ring

[0086] 9 Stator part of the angle sensor

[0087] 10 Fan wheel

[0088] 11 Rotor shaft

[0089] 12 Electric motor terminal box

[0090] 13 Clutch

[0091] 20 ring section

[0092] 21 footbridge section

[0093] 22 Cheek section

[0094] 23 holes

[0095] 40 recess

[0096] 70 Rotor of the angle sensor

[0097] 71 Hole pattern, especially axial through hole

Claims

Patent claims:

1. An electric motor with a fan wheel and fan cover, the electric motor comprising a stator housing, a bearing plate, and an angle sensor, the stator housing being connected to the bearing plate, a bearing, in particular a ball bearing, being accommodated in the bearing plate for supporting the rotor shaft of the electric motor, the fan wheel being connected to the rotor shaft in a rotationally fixed manner, characterized in that the angle sensor is attached to an adapter flange, which functions in particular as a torque support, the adapter flange being attached to the bearing plate and / or being connected to an intermediate ring which is connected to the bearing plate, the fan wheel being arranged within, in particular radially and axially within, the adapter flange, a cheek section of the adapter flange having axially through holes, in particular circular holes, in particular circular hole bores, which cover a radial distance range which is arranged at least partially radially outside the radial distance range covered by the stator of the angle sensor, and / or which are arranged radially outside a hole pattern arranged on the cheek section for fastening the angle sensor, in particular wherein screws passing through holes in the hole pattern of the cheek section pass through the stator of the angle sensor, in particular with which the stator of the angle sensor is fastened to the adapter flange.

2. Electric motor according to claim 1, characterized in that the area covered in the axial direction by the fan cover comprises the area covered in the axial direction by the adapter flange and / or comprises the area covered in the axial direction by the angle sensor, and / or that the fan cover is radially spaced from the angle sensor and from the adapter flange, in particular wherein the angle sensor and the adapter flange are arranged radially inside the fan cover.

3. Electric motor according to one of the preceding claims, characterized in that the adapter flange has a ring section, web sections and the cheek section, wherein the web sections connect the ring section to the cheek section, wherein the web sections are spaced apart from one another in the circumferential direction, wherein the ring section is fastened to the bearing plate, in particular by means of screws, in particular wherein the ring axis of the ring section is aligned coaxially to the axis of rotation of the rotor shaft, in particular wherein the cheek section is designed as a flat disk whose normal direction is aligned coaxially to the axis of rotation of the rotor shaft, in particular so that through-holes are formed in the circumferential direction between the web sections through the adapter flange, in particular wherein the ring section is aligned parallel to the cheek section.

4. Electric motor according to one of the preceding claims, characterized in that the stator of the angle sensor is connected to the cheek section.

5. Electric motor according to one of the preceding claims, characterized in that the rotor of the angle sensor is rotationally connected to the rotor shaft via a coupling, in particular a slotted coupling, in particular wherein the coupling is designed as a hollow shaft provided with slots.

6. Electric motor according to one of the preceding claims, characterized in that the cheek section is designed in the shape of a perforated disk, wherein the coupling projects axially through a hole in the cheek section arranged centrally in the cheek section, in particular wherein the area covered by the cheek section in the axial direction is encompassed by the area covered by the coupling in the axial direction, or that the coupling is arranged within the adapter flange, in particular wherein the area covered by the coupling in the axial direction is encompassed by the area covered by the adapter flange in the axial direction.

7. Electric motor according to one of the preceding claims, characterized in that the cheek section has a hole pattern or the hole pattern for screws or the screws which fasten the stator of the angle sensor to the cheek section.

8. Electric motor according to one of the preceding claims, characterized in that radially outwardly projecting hump regions are formed on the bearing plate, into which hump regions, in particular radially directed threaded bores, are introduced, wherein screws are screwed into the threaded bores, which screws pass through the fan cover and whose respective screw heads press the fan cover towards the respective hump region.

9. Electric motor according to one of the preceding claims, characterized in that the air flow flowing out of the space surrounded by the fan cover between the fan cover and the bearing plate flows along the cooling fins.

10. Electric motor according to one of the preceding claims, characterized in that the fan wheel is arranged in the space surrounded by the adapter flange, and / or that the fan wheel is arranged within the adapter flange.

11. Electric motor according to one of the preceding claims, characterized in that a cover part covers a recess in the fan shroud, wherein the area covered by the recess in the axial direction is encompassed by the area covered by the coupling in the axial direction. And / or that the holes of the cheek section are designed as circular holes, in particular as axially continuous circular holes.

12. Electric motor according to one of the preceding claims, characterized in that the area covered by the clutch in the axial direction is contained in the area covered by the fan cover in the axial direction.

13. Electric motor according to one of the preceding claims, characterized in that the air flow sucked in by the fan wheel passes through grid openings of the fan cover and through the holes of the cheek section, in particular wherein the grid openings are formed on the end face of the fan cover axially remote from the stator housing and / or wherein the holes are formed on the end face of the adapter flange axially remote from the stator housing.

14. Electric motor according to one of the preceding claims, characterized in that a first terminal box is arranged and / or fastened to the stator housing, and / or that cooling fins projecting radially outwards are formed on the stator housing, in particular which extend in the axial direction.

15. Electric motor according to one of the preceding claims, characterized in that a free space is formed between two protrusion regions which are closest to one another in the circumferential direction, which free space is delimited radially inwardly by the bearing plate and radially outwardly by the fan cover and / or through which the air flow conveyed by the fan wheel emerges to the cooling fins, and the radial spacing region covered by the cooling fins overlaps the radial spacing region covered by the free space.

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