Electric motor having a connection box

Abstract

The invention relates to an electric motor having a connection box, wherein the connection box has a lower part which is integrally formed or mounted on a stator housing part of the electric motor, and an upper part, wherein a fan cover radially surrounds a fan of the electric motor and is slipped over an axial end region of the stator housing part, and wherein a portion of an air flow conveyed by the fan flows out through a first outlet opening in the axial direction, i.e. in particular in parallel with the rotational axis of a rotatably mounted rotor of the electric motor, and another portion flows out through a second outlet opening tangentially and / or in the circumferential direction, in particular in relation to the rotational axis of the rotor.

Description

[0001] Electric motor with junction box

[0002] Description:

[0003] The invention relates to an electric motor with a terminal box.

[0004] It is generally known that an electric motor is supplied by means of an electrical supply line and that the power loss of the electric motor must be dissipated to the environment.

[0005] The invention is therefore based on the objective of designing an electric motor with improved cooling.

[0006] According to the invention, the problem is solved in the electric motor according to the features specified in claim 1.

[0007] Important features of the invention for the electric motor with terminal box are that the terminal box has a lower part which is integrally formed or attached to a stator housing part of the electric motor, and an upper part,

[0008] in particular wherein the upper part is placed on the lower part and connected, in particular by means of screws,

[0009] wherein a fan hood radially surrounds a fan of the electric motor and is placed over an axial end region of the stator housing part,

[0010] wherein an airflow conveyed by the fan partially flows axially out through a first outlet opening, in particular parallel to the axis of rotation of a rotatably mounted rotor of the electric motor, and partially flows tangentially and / or circumferentially out through a second outlet opening, in particular with respect to the axis of rotation of the rotor.

[0011] An advantage of this design is that the airflow delivered by the fan is split into two partial flows, with the first flowing in an axial direction and the second in a perpendicular direction. The first partial flow flows axially along the [unclear - possibly referring to a specific area or feature].

[0012] ISI \ EIDOPAT 09.03.2026 stator housing formed cooling fins and the second partial flow along the cooling fins formed on the terminal box or at least along the terminal box. For this purpose, cooling fins are formed on the upper side of the terminal box top part, which preferably extend not only over the top but also over at least one of the side surfaces of the top part.

[0013] The upper part has a substantially cuboid outer shape, with the top surface located on the side of the terminal box facing away from the stator housing. The side surface, over which the cooling fins also extend, is oriented substantially perpendicular to the top surface; in particular, the normal direction of the side surface is perpendicular to the normal direction of the top surface.

[0014] This results in improved cooling performance.

[0015] In an advantageous embodiment, the lower part has an opening which is covered by the upper part and a cover plate. An advantage of this is that the cover plate can be quickly and easily replaced with another cover plate, thus allowing for different configurations with connector components that protrude through the cover plate.

[0016] In an advantageous embodiment, the partial airflow exiting through the second outlet flows along cooling fins of the upper part. It is advantageous that at least one section of the first outlet and one section of the second outlet, while axially spaced apart, are arranged in a common plane. This means that there is a plane that intersects both the first and the second outlet.

[0017] In a preferred embodiment, the cooling fins of the upper part extend over at least two sides of the upper part. The advantage here is that improved cooling performance can be achieved.

[0018] In an advantageous embodiment, the partial airflow exiting through the first outlet opening flows out along cooling fins of the stator housing part,

[0019] especially those extending in the axial direction. An advantage of this is that improved cooling performance can be achieved. In an advantageous embodiment, heat-generating electronic components are arranged in the upper part and are thermally connected to the upper part, particularly for heat dissipation via the upper part to the environment. An advantage of this is improved heat dissipation.

[0020] In an advantageous embodiment, the lower part houses a printed circuit board equipped with a first connector part, a second connector part, and a connector designed as a data interface. An advantage of this design is that the cover, together with the upper and lower parts, encloses the printed circuit board, and the electrical supply is ensured via the connector parts that protrude through the cover.

[0021] In a preferred embodiment, the first and second connector parts protrude through the cover. An advantage of this is that the electrical supply can be guaranteed.

[0022] In an advantageous embodiment, an electrical power supply is looped through the terminal box, particularly through the lower part, with the electrical power passing through the first connector part and the circuit board and exiting at the second connector part. It is advantageous that several electric motors, each of which is similar or identical to the electric motor according to the invention, can be supplied via a conductor loop, i.e., the supply lines are looped through the respective electric motor, and a T-junction is provided in each electric motor for each supply line, so that the electric motors are electrically connected in parallel but are supplied from a single conductor loop along which the electric motors are arranged one after the other.

[0023] In an advantageous embodiment, the locking screw is made of a different material, in particular metal, than the aperture.

[0024] in particular, wherein the aperture is manufactured as a plastic injection-molded part. An advantage of this is that a mechanically robust housing can be designed, especially for the data interface. In an advantageous embodiment, the cooling fins of the upper part are optionally formed only on the side facing away from the lower part, in particular on the top side of the upper part, in particular wherein the smallest distance between the second outlet opening has a first value,

[0025] or the cooling fins extend at least over the side of the upper part facing away from the lower part, in particular the upper part, and over one side of the upper part, in particular where the first value is greater than the second value. An advantage of this is that a series of electric motors can be produced, wherein

[0026] a first variant of the series features an electric motor with a terminal box upper section that only has cooling fins on its upper side and

[0027] A second variant of the series features an electric motor with a terminal box top section that has cooling fins on its side and top surfaces.

[0028] In an advantageous embodiment, the cooling fins of the upper part extend, in particular continuously, over the side facing away from the lower part, in particular the top side, of the upper part and over a side of the upper part, in particular which extends from the contact surface between the upper part and the lower part to the side facing away from the lower part, in particular the top side.

[0029] wherein the height of each cooling fin extending across the side, in particular the maximum distance from the head area of ​​the respective cooling fin to the foot area of ​​the respective cooling fin, decreases monotonically with increasing distance from the lower part,

[0030] In particular, the height is measured within the plane that is the distance to the contact plane between the lower and upper parts. An advantage of this is that a sharp edge on the cooling fins in the transition area from the top to the side surface can be avoided. Specifically, the respective head of each cooling fin in this transition area can be rounded.

[0031] In an advantageous embodiment, the cooling fins of the upper part extend, in particular continuously, over the side facing away from the lower part, in particular the top, of the upper part and over a side of the upper part, in particular which extends from the contact surface between the upper part and the lower part to the side facing away from the lower part, in particular the top, wherein the wall thickness of the respective cooling fin extending over the side decreases monotonically with increasing distance from the lower part.

[0032] In particular, the wall thickness is measured within the plane that is the distance to the contact plane between the lower and upper parts. An advantage of this method is that increased stability is achieved through a stable connection of the cooling fins to the area of ​​the upper part closest to the lower part.

[0033] In an advantageous embodiment, the cooling fins extending across the side of the upper part facing away from the lower part, in particular the upper side, are curved in an S-shape, especially along their length. This design offers the advantage of increased stability.

[0034] In an advantageous embodiment, the fan hood has a fan hood grille on its side facing away from the stator housing part.

[0035] especially through which the airflow drawn in by the fan passes. The advantage here is that the airflow is drawn in while still achieving increased safety.

[0036] In an advantageous embodiment, a radially directed projection of the fan housing, particularly with respect to the axis of rotation of the electric motor's rotor, forms the first outlet opening. The advantage here is that the fan housing only needs to be designed with a corresponding outward curvature, thus enabling simple manufacturing.

[0037] In an advantageous embodiment, a radially directed elevation of the fan hood, relative to the axis of rotation of the rotor of the electric motor, forms the second outlet opening.

[0038] in particular which is axially spaced from the first outlet opening. An advantage here is that the fan hood only needs to be designed with a corresponding outward curvature, thus enabling simple manufacturing. Further advantages arise from the dependent claims. The invention is not limited to the combination of features of the claims. For those skilled in the art, further meaningful combinations of claims and / or individual claim features and / or features of the description and / or the figures will arise, in particular from the problem statement and / or the problem arising from a comparison with the prior art. The invention will now be explained in more detail with reference to a schematic illustration:

[0039] Figure 1 shows a first inverter motor according to the invention from a first viewing direction.

[0040] Figure 2 shows the first inverter motor according to the invention from a second viewpoint.

[0041] Figure 3 shows a second inverter motor according to the invention from a first viewing direction.

[0042] Figure 4 shows the first inverter motor according to the invention from a second viewing direction.

[0043] As shown in the figures, the inverter motor has an electric motor to whose stator housing a lower part 7 of a terminal box of the inverter motor is formed or attached.

[0044] On its side facing away from the stator housing, the lower part 7 has an opening which is covered by an aperture 1 and an upper part 6.

[0045] The upper part 6 of the first inverter motor has cooling fins 14 protruding into the surroundings on its side facing away from the lower part 7.

[0046] In contrast to the first inverter motor, the upper part 6 of the second inverter motor has cooling fins 30 which not only protrude into the environment on the side of the upper part 6 facing away from the lower part 7, but also on at least two sides of the upper part 6, so that the cooling fins 30 extend essentially to the interface between the upper part 6 and the lower part 7.

[0047] In particular, the upper part 6 in each case has a substantially cuboid outer shape, from which the cooling fins (30 or 14) project into the surroundings. In the first inverter motor, this occurs only on one surface, namely the surface of the cuboid furthest from the lower part 7. In the second inverter motor, this occurs on at least three surfaces of the cuboid. Preferably, the surface facing the lower part 7 preferably includes an opening that leads directly into or abuts the opening of the lower part 7.

[0048] The aperture 1, together with the upper part 6, covers the opening of the lower part 7, wherein a first connector part 2 protrudes through the aperture 1 and a data interface designed as a connector is covered by a locking screw 3 screwed into a threaded bore of the aperture 1, and a second connector part 4 protrudes through the aperture 1.

[0049] The connector, the first connector part 2 and the second connector part 4 are mounted on a circuit board which is housed in the lower part 7.

[0050] A rotor 5 of the electric motor is rotatably mounted by means of bearings which are received in bearing flange parts, each of which is connected to the stator housing of the electric motor.

[0051] The stator housing has cooling fins 8 extending in the axial direction, i.e. parallel to the axis of rotation of the rotor 5, along which an airflow conveyed by a fan extends.

[0052] For this purpose, the fan is radially surrounded by a fan shroud 9, which provides an outlet opening for the airflow. Thus, the airflow conveyed by the fan exits in an axial direction and then flows along the cooling fins 8. In particular, the outlet opening is bounded radially outside by the fan shroud 9 and radially inside by the stator housing, especially by its cooling fins 8.

[0053] The fan hood 9 is placed over a first axial end region of the stator housing of the electric motor and has a fan hood grille 11 on its end face opposite the stator housing, through which the airflow drawn in by the fan passes.

[0054] The fan housing 9 has a further outlet opening, which is bounded radially inside by the lower part 7 and radially outside by the fan housing 9. The airflow exiting through this further outlet opening exits in a circumferential direction with respect to the axis of rotation of the rotor 5 and flows along the lower part 7. The airflow conveyed further by the fan thus divides into two partial flows, the first partial flow flowing along the cooling fins 8 formed on the stator housing and the second partial flow flowing in a transverse direction, in particular along the side surfaces of the upper part 6.

[0055] Since the upper part 6 of the first electric motor, shown in Figures 1 and 2, has no cooling fins on its side surfaces, the second partial flow runs along a substantially smooth surface, and the cooling effect on the upper part 6 is significantly lower than in the second electric motor, shown in Figures 3 and 4, which has cooling fins 30 on the side surfaces of the upper part 6. The second partial flow thus flows along the cooling fins 30 of the upper part 6 on one of its side surfaces.

[0056] In particular, the cooling fins 30 of the second electric motor extend over at least one or two of the side surfaces and the upper surface of the top part 6 facing away from the stator housing. The cooling fins 30 extend along the respective side surface in a tangential or circumferential direction.

[0057] A projection 10 is formed on the fan housing 9 to create the additional outlet opening, projecting radially from the fan housing 9. The airflow exiting this additional outlet opening is directed tangentially or circumferentially according to the cooling fins 30 formed on the side surface of the upper part 6. Thus, this exiting airflow flows along the cooling fins 30, particularly in the area of ​​the side surface.

[0058] A radial elevation is also formed on the fan hood 9 to create the first outlet opening, in particular the outlet 12.

[0059] Preferably, the fan hood 9 is made of sheet metal.

[0060] In particular, the upper part 6 is placed on the lower part 7 and is detachably connected, especially by means of screws.

[0061] In further embodiments of the invention, the fan housing 9 is not made of sheet metal, but of injection-molded plastic. The tangential, circumferential, and radial directions are always referenced to the axis of rotation of the electric motor rotor. The axial direction is parallel to the axis of rotation of the electric motor rotor. List of reference numerals

[0062] 1 aperture

[0063] 2 first connector part 3 locking screw

[0064] 4 second connector part 5 rotor

[0065] 6 Top

[0066] 7 Lower part

[0067] 8 stator cooling fins

[0068] 9 Fan hood

[0069] 10 Survey

[0070] 11 fan hood grilles

[0071] 12 Outlet

[0072] 13 Locking screw

[0073] 14 cooling fins

[0074] 30 cooling fins

Claims

Patent claims:

1. Electric motor with junction box, wherein the terminal box has a lower part which is integrally formed or attached to a stator housing part of the electric motor, and an upper part, in particular wherein the upper part is placed on the lower part and connected, in particular by means of screws, characterized by the fact that a fan hood radially surrounds a fan of the electric motor and is placed over an axial end area of ​​the stator housing part, wherein an airflow conveyed by the fan partially flows axially out through a first outlet opening, in particular parallel to the axis of rotation of a rotatably mounted rotor of the electric motor, and partially flows tangentially and / or circumferentially out through a second outlet opening, in particular with respect to the axis of rotation of the rotor.

2. Electric motor according to claim 1, characterized by the fact that the lower part has an opening which is covered by the upper part and a cover.

3. Electric motor according to any of the preceding claims, characterized by the fact that The partial airflow exiting through the second outlet opening flows along cooling fins of the upper part.

4. Electric motor according to any of the preceding claims, characterized by the fact that the cooling fins of the upper part extend over at least two sides of the upper part, in particular over the top and a first side extending from the contact surface between the lower part and the upper part to the top, in particular wherein the cooling fins formed on the first side extend parallel to the direction of the partial airflow exiting from the second outlet opening.

5. Electric motor according to any of the preceding claims, characterized by the fact that the partial airflow exiting through the first outlet opening flows along cooling fins of the stator housing part, especially those extending in the axial direction.

6. Electric motor according to any of the preceding claims, characterized by the fact that Electronic components generating waste heat are arranged in the upper part, which are thermally connected to the upper part, in particular for heat dissipation via the upper part to the environment.- 14- 7. Electric motor according to one of the preceding claims, characterized by the fact that The lower part contains a circuit board which is equipped with a first connector part, a second connector part and a connector designed as a data interface.

8. Electric motor according to any of the preceding claims, characterized by the fact that the first connector part and the second connector part protrude through the cover.

9. Electric motor according to any of the preceding claims, characterized by the fact that an electrical power supply is looped through the terminal box, in particular through the lower part, wherein the electrical power is passed through the first connector part and the circuit board and is brought out at the second connector part.

10. Electric motor according to any of the preceding claims, characterized by the fact that the locking screw is made of a different material, especially metal, than the aperture, in particular where the cover is manufactured as a plastic injection molded part, and / or that the fan hood has a fan hood grille on its side facing away from the stator housing part, in particular through which the airflow drawn in by the fan passes.- 15 - 11. Electric motor according to one of the preceding claims, characterized by the fact that the cooling fins of the upper part optionally are formed either only on the side facing away from the lower part, in particular the upper part, in particular wherein the smallest distance between the second exit opening has a first value, or extend at least over the side of the upper part facing away from the lower part, in particular the upper part, and over one side of the upper part, in particular extending continuously, in particular extending from the contact surface between the upper part and the lower part to the side facing away from the lower part, in particular the upper part, in particular where the smallest distance between the second exit opening has a second value, in particular where the first value is greater than the second value.

12. Electric motor according to any of the preceding claims, characterized by the fact that the cooling fins of the upper part extend over the side of the upper part facing away from the lower part, in particular the top side, and over one side of the upper part, in particular extend continuously, wherein the height of each cooling fin extending across the side, in particular the maximum distance from the head area of ​​the respective cooling fin to the foot area of ​​the respective cooling fin, decreases monotonically with increasing distance from the lower part, in particular wherein the height is measured within the plane which has the distance to the contact plane between the lower part and the upper part.- 16- 13. Electric motor according to one of the preceding claims, characterized by the fact that the cooling fins of the upper part extend over the side facing away from the lower part, in particular the top side, and over one side of the upper part, in particular extending continuously, in particular extending from the contact surface between the upper part and the lower part to the side facing away from the lower part, in particular the top side, wherein the wall thickness of each cooling fin extending across the side decreases monotonically with increasing distance from the lower part, in particular where the wall thickness is measured within the plane which is the distance to the contact plane between the lower part and the upper part.

14. Electric motor according to any of the preceding claims, characterized by the fact that The cooling fins extending across the side of the upper part facing away from the lower part, in particular the upper part, are curved in an S-shape, especially along their extent.

15. Electric motor according to any of the preceding claims, characterized by the fact that A radially oriented elevation of the fan hood, relative to the axis of rotation of the electric motor's rotor, forms the first outlet opening. and / or that a radially directed elevation of the fan hood, relative to the axis of rotation of the rotor of the electric motor, forms the second outlet opening, in particular which is axially spaced from the first outlet opening.

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