Electric motor comprising 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 31 22 655 C2, a speed sensor device is known as the closest prior art.

[0006] An electric motor with a sensor is known from DE 10 2008 028658 A1.

[0007] 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.

[0008] According to the invention, the object is achieved in the electric motor according to the features specified in claim 1.

[0009] 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 shield and an angle sensor, wherein the stator housing is connected to the bearing shield, 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 angle sensor is fastened to an adapter flange, wherein the adapter flange is fastened to the bearing shield.

[0010] 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.

[0011] Components are also arranged between the rotor shaft of the electric motor and the rotor of the angle sensor, enabling a mechanical interface that allows for high variability with a small number of parts. For example, a bolt and a coupling arranged in series with it can be provided as a component.

[0012] 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.

[0013] 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.

[0014] In an advantageous embodiment, the adapter flange has a ring section, web sections and a 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.

[0015] 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.

[0016] 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 connected in a rotationally fixed manner 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.

[0017] In an advantageous embodiment, the cheek section is designed in the shape of a perforated disk. This has the advantage that hole patterns can be arranged at different radial distances. In addition, the cheek section is disk-like and thus solid and rigid, while also offering a high thermal capacity to spread the heat loss generated by the angle sensor. In an advantageous embodiment, the cheek section has a hole pattern for screws that fasten the stator of the angle sensor to the cheek section, wherein the cheek section is continuous from the maximum radial distance of the hole pattern to the radial outer circumference of the cheek section, in particular up to the largest radial distance of the cheek section, in particular therefore without an axially continuous recess.The advantage here is that there is a high heat capacity to spread the power loss generated by the angle sensor and a rigid base for the stable connection of the stator of the angle sensor.

[0018] In an advantageous embodiment, the bearing shield is formed with radially outwardly projecting protrusions, into which radially directed threaded holes are provided. Screws are screwed into the threaded holes, which penetrate the fan cover, and whose respective screw heads press the fan cover toward the respective protrusion. The advantage here is that the protrusions allow a clear space between the fan cover and the bearing shield, through which the airflow conveyed by the fan flows out to the cooling fins.

[0019] In an advantageous embodiment, the airflow escaping from the space between the fan cover and the bearing plate, enclosed by the fan cover, flows along the cooling fins. This is advantageous in that efficient cooling is enabled. In particular, the radial clearance area covered by the clear space overlaps the radial clearance area covered by the cooling fins.

[0020] In an advantageous embodiment, a fan is arranged in the space enclosed by the fan cover, whose electrical supply lines are routed to a terminal box attached to the fan cover. Advantageously, the fan can be arranged axially between the grille openings and the angle sensor, so that the air flow drawn in by the fan flows along the angle sensor and the adapter flange.

[0021] This allows for improved cooling of the angle sensor. The adapter flange's web areas create increased thermal resistance between the bearing plate and the flange section. This means that a significant portion of the angle sensor's heat loss flows into the airflow conveyed by the fan.

[0022] In an advantageous embodiment, a casing surrounds the radial outer circumference of the adapter flange, in particular so that the adapter flange together with the casing surrounds the coupling in a housing-forming and / or protective manner. The casing provides improved protection. In particular, it prevents dirt from penetrating the coupling. Thus, the coupling can be designed as a slotted coupling, whereby the slots of the slotted coupling cannot become clogged.

[0023] In an advantageous embodiment, the shell part is manufactured as a sheet metal part. This allows for a simple, cost-effective, and material-saving enclosure.

[0024] 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.

[0025] In an advantageous embodiment, a fan motor with a fan impeller is arranged on the inside of the fan cover, and 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.

[0026] In an advantageous embodiment, a first terminal box is arranged and / or attached to the stator housing. This is advantageous in that easily accessible electrical connections are made possible. In an advantageous embodiment, a second terminal box is arranged and / or attached to the fan cover. This is advantageous in that the fan can be supplied with electrical power in an easily accessible manner, and the fan cover, with the fan attached to it, can be stored and transported as a pre-assembled unit. This enables simple installation or even the simple replacement of an angle sensor with a different angle sensor.

[0027] 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.

[0028] 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.

[0029] 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.

[0030] The invention will now be explained in more detail using schematic illustrations:

[0031] Figure 1 shows an electric motor according to the invention in an oblique view and exploded.

[0032] Figure 2 shows an adapter flange 5 in an oblique view.

[0033] Figure 3 shows a bearing flange 3 in an oblique view.

[0034] In Figure 4, a fan cover 6, which includes a fan, is shown in an oblique view.

[0035] Figure 5 shows a shell part 4 in an oblique view.

[0036] Figure 6 shows a coupling 13 in an oblique view.

[0037] Figure 7 shows an angle sensor of the electric motor in an oblique view.

[0038] Figure 8 shows a bolt 10 of the electric motor in an oblique view.

[0039] In Figure 9, the electric motor according to the invention is shown in an oblique view and exploded.

[0040] As shown in the figures, the electric motor has a stator housing which has cooling fins projecting radially outwards on its radial outer circumference and extending in the axial direction.

[0041] At a first axial end of the stator housing 1, a bearing plate 3 is connected to the stator housing 1, which accommodates a bearing for rotatably supporting the rotor shaft 11 of the electric motor. The axial direction is parallel to the direction of the rotational axis of the rotor shaft 11. The radial direction and the circumferential direction are each related to the rotational axis of the rotor shaft 11.

[0042] A threaded hole is made in the front side of the rotor shaft 11, into which a bolt 10, in particular a screw bolt, is screwed with its threaded section

[0043] This bolt 10 is connected at its end region facing away from the rotor shaft 11 to a coupling 13, which connects the rotor of the angle sensor to the bolt 10 and thus to the rotor shaft 11 in a rotationally fixed manner.

[0044] The stator of the angle sensor is connected to an adapter flange 5, which acts as a torque support. For this purpose, the stator of the angle sensor is connected to a flange section 22 by means of screws. This flange section is connected via circumferentially spaced web sections 21 to a ring section 20, which in turn is attached to the bearing plate 3 by means of screws.

[0045] The coupling 13 is enclosed by the adapter flange. For this purpose, the axial area covered by the coupling 13 is enclosed by the axial area covered by the adapter flange.

[0046] 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.

[0047] 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.

[0048] The fan cover 6 is radially spaced from the adapter flange 5 and the angle sensor 9.

[0049] On its end face axially remote from the stator housing 1, the fan cover 6 has continuous grille openings 7, so that an air flow sucked in by the fan enters through the grille openings 7 and flows past the angle sensor, in particular axially between the stator 9 of the angle sensor and the fan cover 6, and / or also flows past the adapter flange 5, in particular between the adapter flange 5 and the fan cover 6. The air flow conveyed by the fan then exits the space surrounded by the fan cover 6 toward the cooling fins of the stator housing part 1, wherein the cooling fins extend in the axial direction.

[0050] The fan is arranged in the space surrounded by the fan cover 6, in particular axially between the grille openings 7 and the adapter flange 5.

[0051] 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.

[0052] The jacket part 4 is designed like a cylinder jacket and surrounds the radially outer circumference of the adapter 5. The jacket part 4 lies directly on the adapter flange 5.

[0053] The electrical supply lines of the fan are led to a terminal box 8, which is attached and / or fastened to the outside of the fan cover 6.

[0054] 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.

[0055] The adapter flange 5 provides a mechanical interface for connecting various types of angle sensor stators. Accordingly, the bolt 10 and / or the coupling 13 also provide 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.

[0056] The fan including the fan wheel is arranged inside the fan cover 6 and outside the adapter flange 5.

[0057] Preferably, the casing part 4 is made of sheet metal. Preferably, the coupling 13 is a slotted coupling. This is produced by slots formed in a hollow shaft, with each slot being arranged in a plane, particularly a slotted plane, and the planes being axially spaced from one another, with all planes being aligned parallel to one another.

[0058] Preferably, in the respective plane, each slot is designed in such a way that only a single web bridges the respective slot or that only two webs bridge the respective slot

[0059] In further embodiments of the invention, the casing part 4 is removed, thus allowing the adapter flange 5 to be cooled by the air flow. Furthermore, the air flow thus passes through the continuous recesses of the adapter flange 5, defined by the web sections 21, to the bearing of the rotor shaft of the electric motor.

[0060] List of reference symbols

[0061] 1 stator housing

[0062] 2 hump area

[0063] 3 bearing plate

[0064] 4 Sheath part

[0065] 5 Adapter flange

[0066] 6 Fan cover

[0067] 7 grille openings

[0068] 8 Terminal box for supply lines of the fan motor

[0069] 9 Stator part of the angle sensor

[0070] 10 bolts, especially screw bolts

[0071] 11 Rotor shaft

[0072] 12 Electric motor terminal box

[0073] 13 Clutch

[0074] 20 ring section

[0075] 21 footbridge section

[0076] 22 Cheek section

[0077] 70 Rotor of the angle sensor

Claims

Patent claims:

1. Electric motor with fan and fan cover, wherein the electric motor has a stator housing, a bearing shield and an angle sensor, wherein the stator housing is connected to the bearing shield, wherein a bearing, in particular a ball bearing, for supporting the rotor shaft of the electric motor is accommodated in the bearing shield, characterized in that the angle sensor is fastened to an adapter flange, wherein the adapter flange is fastened to the bearing shield.

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 a 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, in particular wherein the cheek section is aligned parallel to the ring section, in particular therefore the ring axis of the ring section is a rotational symmetry axis of 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 connected via a coupling, in particular a slotted coupling, to a bolt, in particular a screw bolt, in a rotationally fixed manner, wherein the bolt is connected to the rotor shaft in a rotationally fixed manner, in particular wherein the bolt is screwed into a threaded bore of the rotor shaft, 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 disc.

7. Electric motor according to one of the preceding claims, characterized in that the cheek section has a hole pattern for screws which fasten the stator of the angle sensor to the cheek section, wherein from the maximum radial distance of the hole pattern to the radial outer circumference of the cheek section, in particular up to the greatest radial distance of the cheek section, the cheek section is designed to be uninterrupted, in particular without an axially continuous recess.

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 a fan is arranged in the space surrounded by the fan cover, the electrical supply lines of which are led to a terminal box which is fastened to the fan cover, the fan being arranged inside the fan cover and outside the adapter flange.

11. Electric motor according to one of the preceding claims, characterized in that a casing part surrounds the radial outer circumference of the adapter flange, in particular so that the adapter flange together with the casing part surrounds the coupling in a housing-forming and / or protective manner.

12. Electric motor according to one of the preceding claims, characterized in that the casing part is manufactured as a sheet metal part.

13. Electric motor according to one of the preceding claims, characterized in that the coupling is arranged within the adapter flange, wherein the area covered by the coupling in the axial direction is contained in the area covered by the fan cover in the axial direction.

14. Electric motor according to one of the preceding claims, characterized in that a fan motor with a fan wheel is arranged on the inside of the fan cover and the air flow sucked in by the fan wheel passes through grid openings in the fan cover, in particular wherein the grid openings are formed on the end face of the fan cover axially remote from the stator housing.

15. 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 a second terminal box is arranged and / or fastened to the fan cover, and / or that cooling fins projecting radially outwards are formed on the stator housing, in particular which extend in the axial direction, and / or 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 inwards by the bearing plate and radially outwards 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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