Electric motor with fan assembly

Abstract

The invention relates to an electric motor with a fan assembly. The electric motor has a stator housing and a rotor shaft which is rotatably mounted relative to the stator housing. The stator housing has axially extending cooling ribs, wherein the fan assembly has a fan and a fan cover, and the fan assembly has a cap and an air guide part. The fan cover is connected to the air guide part, which is arranged at a distance to the cap. The air guide part is at least partly pushed over the stator housing, and the cap is arranged on the fan and / or fan cover face facing away from the stator housing in the axial direction. The radial distance range covered by the cap comprises the radial distance range covered by the fan cover.

Description

[0001] Electric motor with fan arrangement

[0002] Description:

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

[0004] It is common knowledge that a fan can be used to cool electrical devices, such as electric motors.

[0005] The invention is therefore based on the object of developing an air-cooled electric motor for use in the external environment, in particular outside a building. According to the invention, this object is achieved with the electric motor according to the features specified in claim 1.

[0006] Important features of the invention in the electric motor with fan arrangement are that the electric motor has a stator housing and a rotor shaft which is mounted rotatably relative to the stator housing, wherein the stator housing has cooling fins extending in the axial direction, wherein the fan arrangement has a fan and a fan cover, wherein the fan arrangement has a cap and an air guide part, wherein the fan cover is connected to the air guide part which is spaced from the cap, wherein the air guide part is at least partially slipped over the stator housing, wherein the cap is arranged on the side of the fan and / or the fan cover facing away from the stator housing in the axial direction, wherein the radial distance area covered by the cap comprises the radial distance area covered by the fan cover.

[0007] The advantage here is that the electric motor is air-cooled, meaning that an airflow driven by a fan flows along the electric motor, thus dissipating the motor's waste heat. Outdoors, the cover acts as a rain shield. The drawn-in airflow enters the cover and fan shroud in a direction opposite to the axial direction and is redirected on the inside of the cover, so that the drawn-in airflow flows in an axial direction through the grille openings of the fan shroud to the fan, which expels the airflow along the stator housing, particularly along the stator housing's cooling fins.

[0008] In an advantageous embodiment, the airflow conveyed by the fan is drawn in through grille openings in the fan cover, particularly those facing the cover. This prevents the entry of foreign bodies larger than the grille openings. While such foreign bodies can be entrained vertically upward in the airflow, they cannot penetrate the fan cover and thus cause no damage. The incoming airflow is protected from rain and hail by the cover.

[0009] In an advantageous design, the airflow conveyed by the fan flows between the stator housing and the air guide along the cooling fins. The advantage here is that the cooling fins direct the airflow, thus allowing for the most efficient heat dissipation possible.

[0010] In an advantageous embodiment, the air guide element completely surrounds the stator housing radially, in particular continuously. This advantageously allows the air flow to be guided along the stator housing without loss, particularly between the air guide element and the stator housing.

[0011] In an advantageous embodiment, the clear inner diameter of the air guide part increases monotonically with increasing distance from the cap, in particular as a monotonically increasing function of the distance. This is advantageous in that a diffuser effect can be achieved, in particular a slowing of the air flow and thus a more efficient utilization of the cooling capacity per air flow volume. In particular, the electrical power supplied to the fan thus ensures the highest possible heat flux density.

[0012] In an advantageous embodiment, a terminal box is attached to the fan cover, into which the fan's connecting cables are routed. The advantage here is that the fan cover is designed to be sufficiently stable and / or rigid for mounting.

[0013] In an advantageous embodiment, slots, particularly L-shaped slots, are formed on the air guide part for connection to the fan cover, in particular with a respective screw extending through each slot. This is advantageous because the fan cover can be connected to the air guide part as quickly and easily as possible by axial insertion followed by a rotational movement. The screws can then be tightened. In particular, a bayonet connection can be implemented easily.

[0014] In an advantageous embodiment, the cap is held on the fan cover by means of holders which are spaced apart from one another in the circumferential direction, in particular are regularly spaced apart, in particular wherein a first end region of the respective holder is integrally connected to the cap, in particular to the inside of the cap, in particular is welded, and wherein a second end region of the respective holder is integrally connected to the fan cover, in particular to the outside of the cap, in particular is welded, in particular wherein the first end region is radially spaced from the second end region. The advantage here is that the holding can be carried out cost-effectively.

[0015] In an advantageous embodiment, the cap is designed to be airtight and watertight across the entire radial clearance area covered by the cap, with this radial clearance area extending from zero to the outer radius, in particular to the outer radial circumference of the cap. This is advantageous because the electric motor, which is arranged below the cap in the direction of gravity, is protected from rain and hail.

[0016] In an advantageous embodiment, the cap is designed as a rotating body, with the cap having, on the one hand, a conical shell region, adjacent to the largest diameter of which is a cylindrical collar region of the cap, in particular, to the inside of which the holders are welded. This is advantageous because it enables simple manufacturing.

[0017] In an alternative design, the cap has circumferentially spaced, radially outward-facing elevations that extend in the axial direction. This improves fluid drainage and allows the cap to be easily and cost-effectively manufactured as a stamped and bent sheet metal part.

[0018] In an advantageous embodiment, the air guide part has circumferentially spaced, radially outwardly directed elevations that extend in the axial direction. This is advantageous because the air guide part can be easily and cost-effectively manufactured as a stamped and bent sheet metal part.

[0019] In an advantageous embodiment, the elevations on the air guide part and the elevations on the cap are aligned coaxially with each other. This has the advantage of improving water drainage. In particular, a water stream flowing in a recess between two adjacent elevations drips from the cap as a scattered and thus wider stream of droplets, either hitting a corresponding recess on the air guide part or dripping past the motor in the air. The number of elevations along the entire circumference is preferably between six and twelve. Thus, the aforementioned effect occurs even with greater scattering.

[0020] In an advantageous embodiment, the circumferential angular range covered by the respective elevation on the air guide part comprises a circumferential angular range covered by a respective elevation on the cap. The advantage here is that the drainage of water is improved. In particular, a water stream flowing in a depression between two adjacent elevations drips down from the cap as a scattered and thus wider flow of drops either hits a corresponding depression in the air guide part or drips past the motor in the air. The number of elevations along the entire circumference is preferably between six and twelve. Thus, the aforementioned effect occurs even with greater scattering. The elevations are preferably regularly spaced from one another in the circumferential direction.

[0021] In an advantageous design, the fan cover and the air guide are connected to each other using a bayonet lock. This allows for quick and easy connection.

[0022] In an advantageous embodiment, the air guide element is attached to the stator housing by means of screws extending through holes in the air guide element. This allows for a cost-effective and simple attachment.

[0023] The respective aforementioned radial distance range is the range of radial distances that are related to the axis of rotation of the rotor shaft.

[0024] 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.

[0025] The invention will now be explained in more detail using schematic illustrations:

[0026] Figure 1 shows a fan arrangement of an electric motor according to the invention in side view.

[0027] Figure 2 shows a cap 1 of the fan assembly in an oblique view.

[0028] Figure 3 shows the fan arrangement without the cap 1 in an oblique view.

[0029] Figure 4 shows a bracket 4 of the fan assembly in an oblique view.

[0030] As shown in the figures, the fan assembly comprises a fan cover 3 surrounding a fan whose electrical connection cables, in particular supply cables, are routed into a terminal box 6, which is attached to the fan cover 3. Electrical cables coming from the outside can be routed into the terminal box to supply the fan.

[0031] The fan has an electric motor which is arranged inside the fan cover 3 and attached to it.

[0032] An air guide part 5 is connected to the fan cover 3 in that the air guide part 5 with slots formed on it is pushed towards screws 4 protruding from the fan cover 3.

[0033] The slots are preferably L-shaped, wherein a respective screw 4 projects through the respective slot and the screw head of the respective screw presses the air guide part 5 in the radial direction against the fan cover 3, in particular which is partially inserted into the air guide part 5.

[0034] The fan cover 3 is made of metal, in particular as a sheet metal part. The air guide part 5 is preferably also made of sheet metal, in particular as a stamped and bent part. Brackets 2 are welded to the fan cover 3 and carry a cap 1, to which they are welded.

[0035] The brackets 2 are welded to the fan cover 3 with their respective first end region on the radial outer circumference of the fan cover 3.

[0036] With their respective second end region, the holders 2 are welded to the inside of the essentially frustoconical cap 1.

[0037] The cap 1 is also made of metal, in particular as a sheet metal part.

[0038] The cap 1 covers a larger radial distance area than the fan cover 3.

[0039] The cap 1 is designed as a rotational body and has, on the one hand, a conical shell area, to the largest diameter of which a cylindrical collar area is adjacent, to the inside of which the holders 4 are welded.

[0040] The end face of the cap 1 facing away from the terminal box 6 is covered by a sheet metal plate. The sheet metal plate is formed integrally, in particular, with the collar area and the conical jacket area.

[0041] A hollow, in particular hollow-cylindrical, air guide part 5 is connected to the side of the fan cover 3 axially facing away from the cap 1.

[0042] The clear inner diameter of the air guide part 5 increases monotonically with increasing distance from the cap 1. This expansion allows for an improvement in the air flow velocity.

[0043] The radial distance area covered by the cap 1 comprises the radial distance area covered by the fan cover 3 and preferably also the radial distance area covered by the air guide part 5.

[0044] The cap 1 thus projects radially beyond the fan cover 3. The air guide part 5 is placed over a stator housing of the electric motor, which has axially extending cooling fins that direct the air flow conveyed by the fan between the stator housing and the air guide part 5.

[0045] The axial direction is aligned parallel to the rotational axis of the electric motor's rotor shaft. The radial distances are always relative to the rotor shaft's rotational axis. The circumferential direction is also relative to the rotor shaft's rotational axis.

[0046] Preferably, the rotational axis of the electric motor's rotor shaft is oriented vertically. Thus, the cap 1 provides protection against raining liquid.

[0047] The fan cover 3 has grille openings 30 on its side facing the cap 1, through which the fan draws in the air flow it delivers. The air flow delivered by the fan exits the stator housing on the side of the fan cover 3 facing away from the cap 1.

[0048] Outdoors, the cap 1 acts as a rain shield. The drawn-in airflow enters the fan cover 3 in a counter-axial direction and is deflected on the inside of the cap 1, so that the drawn-in airflow passes in the axial direction through the grille openings of the fan cover 3 to the fan, which expels the airflow along the stator housing, particularly along the cooling fins of the stator housing.

[0049] In further embodiments according to the invention, the air guide part 5 is made of plastic.

[0050] In further embodiments of the invention, the cap has circumferentially spaced, radially outwardly directed elevations that extend in the axial direction. Thus, in light rain, especially drizzle, water droplets accumulate more quickly between the elevations and then flow downwards more quickly. In this way, the accumulation of water or water droplets is reduced.

[0051] 1 Cap 2 Bracket

[0052] 3 Fan cover

[0053] 4 screw

[0054] 5 Air duct part

[0055] 6 Junction box 7 Hole

[0056] 30 grille openings

Claims

Patent claims:

1. Electric motor with fan arrangement, wherein the electric motor has a stator housing and a rotor shaft rotatably mounted relative to the stator housing, wherein the stator housing has cooling fins extending in the axial direction, wherein the fan arrangement has a fan and a fan cover, characterized in that the fan arrangement has a cap and an air guide part, wherein the fan cover is connected to the air guide part which is spaced from the cap, wherein the air guide part is at least partially slipped over the stator housing, wherein the cap is arranged on the side of the fan and / or the fan cover facing away from the stator housing in the axial direction, wherein the radial distance area covered by the cap comprises the radial distance area covered by the fan cover.

2. Electric motor according to claim 1, characterized in that the air flow conveyed by the fan is sucked in through grille openings, in particular through grille openings facing the cap, of the fan cover.

3. Electric motor according to one of the preceding claims, characterized in that the air flow conveyed by the fan flows between the stator housing and the air guide part along the cooling fins.

4. Electric motor according to one of the preceding claims, characterized in that the air guide part radially surrounds the stator housing completely, in particular continuously.

5. Electric motor according to one of the preceding claims, characterized in that the clear inner diameter of the air guide part increases monotonically with increasing distance from the cap, in particular increases as a monotonically increasing function of the distance.

6. Electric motor according to one of the preceding claims, characterized in that a terminal box is attached to the fan cover, into which connection cables of the fan are led.

7. Electric motor according to one of the preceding claims, characterized in that slots, in particular L-shaped slots, are formed on the air guide part for connection to the fan cover, in particular wherein a respective screw projects through the respective slot.

8. Electric motor according to one of the preceding claims, characterized in that the cap is held on the fan cover by means of holders which are spaced apart from one another in the circumferential direction, in particular are regularly spaced apart, in particular wherein a first end region of the respective holder is materially connected to the cap, in particular to the inside of the cap, in particular is welded, and wherein a second end region of the respective holder is materially connected to the fan cover, in particular to the outside of the cap, in particular is welded, in particular wherein the first end region is radially spaced from the second end region.

9. Electric motor according to one of the preceding claims, characterized in that the cap is designed to be air-tight and water-tight in the entire radial distance range covered by the cap, this radial distance range extending from zero to the outer radius, in particular to the radial outer circumference, of the cap.

10. Electric motor according to one of the preceding claims, characterized in that the cap has circumferentially spaced, radially outwardly directed elevations which extend in the axial direction.

11. Electric motor according to one of the preceding claims, characterized in that the air guide part has circumferentially spaced, radially outwardly directed elevations which extend in the axial direction.

12. Electric motor according to one of the preceding claims, characterized in that the elevations on the air guide part and the elevations on the cap are aligned coaxially with one another, and / or that the circumferential angular range covered by the respective elevation on the air guide part each comprises a circumferential angular range covered by a respective elevation on the cap.

13. Electric motor according to one of the preceding claims, characterized in that the cap and / or the air guide part is designed as a rotary body, the cap having, on the one hand, a conical shell region, to the largest diameter of which a cylindrical collar region of the cap adjoins, in particular to the inside of which the holders are welded.

14. Electric motor according to one of the preceding claims, characterized in that the fan cover and the air guide part are connected to one another by means of a bayonet lock.

15. Electric motor according to one of the preceding claims, characterized in that the air guide part is fastened to the stator housing by means of screws projecting through through holes in the air guide part.

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