Electronics housing and electric motor

Abstract

The invention relates to an electronics housing (1) for an electric motor (15), wherein: the electronics housing (1) comprises a mounting surface (6) for axially fastening to a stator bush (20) of the electric motor (15); the mounting surface (6) defines a mounting plane (7) that extends radially to an axis of the electric motor (15); at least one cooling channel (10a, 10b) is formed on an outer wall (9) of the electronics housing (1), which cooling channel extends at least in part in the axial direction (11) and is designed to convey a cooling-air flow towards the stator bush (20) of the electric motor (15). The electronics housing (1) comprises a cooling-channel extension (12) for the cooling-air flow which extends in the axial direction (11) beyond the radial mounting plane (7) and forms an axial extension of the cooling channel (10b). The invention also relates to a corresponding electric motor (15).

Description

[0001] ELECTRONICS HOUSING AND ELECTRIC MOTOR

[0002] The invention relates to an electronics housing for an electric motor, wherein the electronics housing has a mounting surface for axial fastening to a stator bushing of the electric motor, wherein the mounting surface defines a mounting plane extending radially to an axis of the electric motor, wherein at least one cooling channel is formed on an outer wall of the electronics housing, which cooling channel extends at least partially in the axial direction and is designed to guide a cooling air flow towards the stator bushing of the electric motor.

[0003] The invention further relates to an electric motor with this electronics housing.

[0004] Electronics housings for electric motors of the type in question have been known in practice for years. In the technical field of electric motors with integrated electronics—for example, for a fan—there are already numerous solutions for cooling the electronics housing as well as for cooling the stator bushing of the electric motor.

[0005] Simple solutions utilize air turbulence between the fins of an air-conveying element. The air-conveying element can rotate around the stator with the electric motor's rotor and be designed, for example, as a cooling wheel and / or a cooling ring. The fins of the air-conveying element, in conjunction with opposing fins of a stator bushing flange, can generate turbulence of cooling air, which can be used to cool the electronics housing and / or the stator bushing.

[0006] WO 2014 / 019853 A2 discloses an electronics housing whose outer wall is provided with several axially extending cooling channels formed by ribs. To ensure cooling of the associated electric motor or its stator bushing, axially extending through-openings are provided in the stator bushing. A fan, which is rotationally fixedly connected to a rotor, draws in an axial air flow through the through-opening during motor operation. Another variant for cooling a stator bushing and a separate electronics housing is described in DE 102012003414 B4.

[0007] However, the electronics housings known from the prior art are not optimal in terms of targeted cooling air flow or simplified manufacturing of the stator bushing. Furthermore, known electronics housings are not optimal in terms of particularly versatile and flexible mounting on the associated electric motor or its stator bushing.

[0008] The present invention is therefore based on the object of at least largely eliminating the problems occurring in the prior art. Using simple means, an electronics housing and an electric motor of the type mentioned above are to be designed and developed in such a way that the cooling air can be directed more specifically to the area of ​​components to be cooled—in particular, electronics components and / or the electric motor. Furthermore, the electronics housing is to be versatile and flexible in its mounting on the electric motor and, in particular, facilitates simplified manufacturing of the stator bushing. Furthermore, the electronics housing and the electric motor according to the invention are to be distinguished from competitive products.

[0009] According to the invention, the above object is achieved by the features of claim 1. Accordingly, the electronics housing in question has a cooling channel extension for the cooling air flow, which extends in the axial direction beyond the radial mounting plane and forms an axial extension of the cooling channel.

[0010] With regard to the electric motor, the above object is achieved by the features of claim 9. According to this, the electric motor comprises an electronics housing according to the invention.

[0011] In accordance with the invention, it was first recognized that the above-mentioned object can be achieved in a surprisingly simple manner through a clever refinement of the electronics housing. At least one cooling channel extension extends axially beyond the radial mounting plane, namely into the plane of the stator bushing or around the stator bushing flange or between the fastening elements of the stator bushing.

[0012] By providing a cooling channel extension for the electronics housing according to the invention, it is no longer necessary, compared to previously known solutions, to provide a through-opening in the stator bushing through which the cooling air can be sucked in in the axial direction, because the cooling air can be transported through the cooling channel extension in the axial direction towards an air conveying element and sucked in by the air conveying element through the cooling channels or the cooling channel extension. Even if a through-opening is provided, the manufacture of the stator bushing is simplified because complex geometries for conducting the cooling air are assigned to the electronics housing and no longer have to be formed in the stator bushing. This simplifies the manufacture of the stator bushing. Furthermore, the electronics housing according to the invention is particularly versatile and flexible with regard to assembly on the electric motor or on the stator bushing.The cooling channel extension can be used to ensure that the electronics housing fits snugly on the electric motor or its stator bushing, or to align the electronics housing and the stator bushing relative to each other during assembly.

[0013] Thus, an electronics housing is provided that can direct cooling air more precisely to the area of ​​components to be cooled—particularly parts of the electric motor. Furthermore, the electronics housing can be mounted on the electric motor in a versatile and flexible manner, facilitating simplified manufacturing of the stator bushing. The electronics housing and electric motor according to the invention differ from competitive products.

[0014] In other words, the cooling channel extension can be a guide element or air guide element that directs cooling air, which is sucked in from the stator bushing side - in particular by means of an air conveying element - in the axial direction beyond the radial mounting plane towards the components of the electric motor to be cooled. The outer wall of the electronics housing can be designed, at least in sections, to be essentially circular-cylindrical and to encircle the axis of the electric motor. An annular, circumferential cooling channel extension can be provided along a shell of the outer wall. Alternatively, several cooling channel extensions can be provided along the shell of the outer wall. In other words, several cooling channel extensions can be provided along a circumference of the electronics housing and encircle the electronics housing. Angular distances can be formed between the cooling channel extensions.

[0015] The cooling channel extension can preferably have a wall that radially delimits the cooling channel toward the outside and / or inside. The wall that radially delimits the cooling channel toward the inside can, for example, be identical to the outer wall of the electronics housing. The wall that delimits the cooling channel toward the outside can, for example, be designed in the form of a radial cover device. The radial cover device can be formed integrally with the outer wall of the electronics housing or can be designed as a separate component and can be attached to the electronics housing from the outside.

[0016] In other words, the wall can be arranged as a separate part on the cooling channels. The radial cover device can also be part of an engine mount, for example.

[0017] The cooling channel can be defined laterally, or in other words in a direction running around the circumference of the electronics housing, for example by ribs. The ribs can be formed on the outside of the outer wall of the electronics housing. A cooling channel can be defined between every two ribs. Conversely, a rib can be formed between every two cooling channels, separating the two cooling channels from each other or, in other words, laterally delimiting the cooling channels. In this way, the cooling channels can be easily defined and the electronics housing can be manufactured in a simplified manner. In other words, the ribs can form cooling fins and increase the surface area for heat dissipation from the electronics housing to the cooling air.

[0018] At the stator bushing end of the cooling channel or cooling channel extension, ribs can be provided in the stator bushing, which extend in particular radially. The ribs in the stator bushing or on the stator bushing flange can be wave-shaped to increase the cooling air path and the cooling surface. These ribs can advantageously draw the cooling air radially inward to cool the components of the electric motor. The ribs of the stator bushing can be located axially opposite the air conveying element.

[0019] With a view to particularly advantageous cooling of the components of the electric motor, the cooling duct extension can be at least partially closed axially in the area of ​​an air outlet. The advantage of this is that a targeted deflection of the air flow radially inward can occur. For this purpose, for example, an inward-facing deflection projection can be provided at the stator bushing-side end of the cooling duct extension, which deflects the air outlet inward. Although deflection can already occur through the suction of the cooling air by the air conveying element, some of it can escape from a sealing gap - described in more detail later. A targeted deflection is advantageous in this respect.

[0020] The cooling channel extension can be formed integrally with the electronics housing.

[0021] With a view to particularly flexible retrofitting and simple production of the electronics housing, the cooling channel extension can be designed as a component separate from the electronics housing. The cooling channel extension can then be manufactured separately and plugged onto the electronics housing and / or inserted into the electronics housing. The separate component can, for example, be designed as a cooling channel segment. In this case, several cooling channel segments can be provided along the shell of the outer wall of the electronics housing. In other words, several cooling channel segments can be provided along a circumference of the electronics housing and all the way around the electronics housing. For example, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16 or even more cooling channel segments can be provided. Angular distances can be formed between the cooling channel segments. The angular distances can be constant or varying all the way around the electronics housing.The cooling channel segments can be mounted on the mounting surface of the electronics housing, in particular on the front side of the electronics housing.

[0022] According to an advantageous embodiment, a seal extending substantially along the mounting plane between the electronics housing and the stator bushing can extend radially inward from the cooling channel extension, so that the cooling channels are located outside.

[0023] The electronics housing can preferably have a substantially radially extending base and / or cover. This further simplifies the manufacture and assembly of the electronics housing. The electronics housing can essentially be formed from a cylindrical outer wall and the base and / or cover. The base and / or cover can be formed integrally with the outer wall or with the electronics housing. With regard to accessibility of the interior of the electronics housing, at least one of the base and / or cover can be formed as a separate component, so that the electronics housing can be removed, opened, and / or closed.

[0024] Preferably, the base and / or cover can have a heat sink. The heat sink can be designed, in particular, as a material accumulation in the base for thermal connection to the stator bushing and / or in the cover for thermal connection to the cooling channels. Heat transfer between the stator bushing and the heat sink can be promoted by using a thermal interface material between the stator bushing and the electronics housing—particularly in the area of ​​a heat sink in the base.

[0025] According to an advantageous development, the electronics housing can have a cover device in the region of an inlet and / or adjacent to an inlet and / or at an inlet of the cooling channel, which cover device protects an inlet of the cooling channel from blockages, preventing cooling air from entering the inlet. The cover can form a type of bypass that allows cooling air to enter the cooling channels even when the inlet is blocked. The inlet of the cooling channel can be formed at an end of the electronics housing axially opposite the mounting plane and can be located axially opposite the air outlet or the stator bushing-side end of the cooling channel or the cooling channel extension.In the case of shorter and / or in particular only partially axially extending cooling channels, the cover device can also be formed on the outer wall along the circumference of the electronics housing and / or on the front side and / or partially in the area of ​​heat sinks in order to improve the air flow and airflow around the areas to be cooled.

[0026] The cover device for protecting the entrance to the cooling channel can, in turn, have raised portions to ensure lateral airflow, even if dirt / leaves, etc., obscure the intake openings of the cooling channels. In other words, the raised portions define a bypass for the intake of cooling air from the surroundings of the electronics housing, particularly from the lateral / radial direction. The cover device over the ribs in the electronics housing can have raised portions in the form of ribs for airflow.

[0027] The covering device on the ribs of the electronics housing can have ribs and, alternatively or additionally, a plurality of circular-cylindrical pins or, in other words, knobs. The knobs can be made of an elastic material, for example a thermoplastic elastomer, rubber, or the like, so that they are not damaged during handling and / or cleaning and are easier to clean. The knobs form bypass channels in all directions so that cooling air can flow between the knobs from all directions if the air inlet openings of the electronics housing at the entrance to the cooling channel are blocked by dirt or leaves during intake. The covering device can have one or more inlet openings for the cooling channel, which can preferably be surrounded by knobs.By carefully selecting the spacing and / or size and / or number of the studs, the flow velocity can also be influenced. Alternatively, or in addition to studs on a cover device with a flat profile, a wave-shaped profile can also be used, so that the valleys of the profile protrude between the ribs of the housing, creating an air bypass on the top of the cover device, directed toward the inlet opening.

[0028] The wall that radially defines the cooling channel toward the outside can be designed as a cover that runs around the outer wall and around the axially extending ribs of the cooling channel on the electronics housing, which are designed as radial elevations. Such a cover can also be formed, for example, by a motor mount or an inlet nozzle.

[0029] With regard to the electric motor, the above object is achieved by the features of claim 9. According to this, the electric motor comprises an electronics housing of the type described. The electric motor can be designed, for example, as an external rotor motor, for example for a fan.

[0030] Preferably, the electric motor can comprise a stator with a stator bushing and a rotor with a rotor bell. The rotor bell can be formed radially outside a stator bushing tower, surrounding the stator bushing. Flange sections can be formed radially outside the stator bushing for axial attachment to a mounting wall or supporting structure.

[0031] To enable particularly advantageous, versatile, and flexible mounting of the electronics housing on the electric motor, the flange sections can have holes that function as mounting eyes. The flange sections define a support ring. In other words, the flange sections define support ring segments with which the motor can be mounted. The electric motor as a whole can be attached to a stable mounting wall or supporting structure using the flange sections or the support ring defined by them. Alternatively, the support ring can be designed to be circumferential. Several mounting processes are possible in this case. The electric motor or fan can be attached to the mounting wall or supporting structure from one side, and the electronics housing can then be mounted from the other side.

[0032] Alternatively, the electronics housing can be mounted on the electric motor, and then the assembly of the electronics housing and electric motor is mounted on the mounting wall. Both assembly processes are possible, which offers advantages for the assembly and disassembly of the assembly, the electronics housing, and / or the electronics during servicing.

[0033] Preferably, cooling channel extensions can be arranged in a direction circumferential around a circumference of the electronics housing between the flange sections for axial fastening of the stator bushing.

[0034] The cooling channel extensions can preferably be arranged radially within a diameter range defined by the flange sections or by a support ring. The diameter range defined by the flange sections or by the support ring can be, for example, an inner diameter of the support ring or preferably a centering diameter for the support structure. The cooling channel extensions can be located radially within a range defined by the centering diameter for the support structure. In other words, the inner diameter of the support ring and / or the inner diameter of the flange sections and / or the centering diameter for the support structure can be larger than the outer diameter of the electronics housing. The inner diameter of the flange sections can be different from the centering diameter for the support structure.The flange sections can have a centering area / screw-on area for the motor mounting and a further inner area in which the electronics housing rests or is attached to the flange sections. The cooling channel extensions can preferably be located within this centering area, i.e., radially between the centering area for the motor mounting and the radially inner end of the flange sections. The diameter range defined by the flange sections can be an outer diameter of the flange sections or the screw-on cams in the screw-on area. In this case, the motor mounting can have corresponding recesses for the cooling channel extensions.

[0035] The advantage of this is that the assembly of electric motor and electronics housing can be installed particularly easily from one side into the mounting wall or supporting structure. The electronics housing can be pushed through a mounting opening in the mounting wall or supporting structure, and the electric motor or stator bushing can then be attached to the mounting wall or supporting structure using the stator bushing's mounting eyes. This eliminates an additional assembly step for the electronics housing, as it no longer needs to be subsequently attached to the electric motor or mounting wall or supporting structure from the other side of the mounting wall or supporting structure.

[0036] Preferably, the cooling channel extension can extend in the axial direction beyond the radial mounting plane toward an air conveying element rotating with the rotor in such a way that an axial gap is created between the cooling channel extension and the air conveying element. In other words, the cooling channel extension extends in the axial direction almost up to the air conveying element.

[0037] The air conveying element can be limited or covered by a cover plate in the direction toward the cooling channel extension or the electronics housing. The cover plate can, in particular, be annular. Preferably, the cooling channel extensions project axially far enough that only a small axial sealing gap is created between the cover plate of the air conveying element.

[0038] Preferably, regions of the outer wall of the electronics housing that are opposite the flange sections in the axial direction can be free of cooling channels. The cooling channels can then preferably not be formed circumferentially, but rather can be interrupted at least by the flange sections with the fastening eyes of the stator bushing. This allows for a compact design of the electronics housing and thus also less obstruction of the air flow. There are now various possibilities for advantageously embodying and developing the teaching of the present invention. In this regard, reference is made, on the one hand, to the claims subordinate to claim 1 and, on the other hand, to the following explanation of preferred embodiments of the invention with reference to the drawings.In conjunction with the explanation of the preferred embodiments of the invention with reference to the drawings, generally preferred embodiments and further developments of the teaching are also explained. Shown in the drawings.

[0039] Fig. 1 shows a perspective view from the bottom side of a first embodiment of an electronics housing according to the invention with cooling channel extensions projecting beyond the radial mounting plane,

[0040] Fig. 2 shows a perspective view of an electric motor whose stator bushing has flange sections for axial attachment to the mounting surface of the electronics housing,

[0041] Fig. 3 shows a perspective view of the electronics housing from Fig. 1 and the electric motor from Fig. 2 in assembly,

[0042] Fig. 4 shows a sectional view of the electronics housing from Fig. 1 and the electric motor from Fig. 2 in assembly,

[0043] Fig. 5 shows a perspective view of the stator bushing of the electric motor from Fig. 2,

[0044] Fig. 6 is a detailed view of Fig. 5 in the area of ​​the cooling structure, with additional ribs schematically shown,

[0045] Fig. 7 is a detailed view of Fig. 4 in section with the path of the cooling air from the inlet of the cooling channel through the air conveying element, Fig. 8 is the detailed view according to Fig. 7 with the path of the heat dissipation shown,

[0046] Fig. 9 shows a perspective view of a cooling channel extension which is designed as a separate component in the form of a cooling channel segment,

[0047] Fig. 10 shows a sectional view of a second embodiment of the electronics housing with cooling channel extensions projecting beyond the radial mounting plane,

[0048] Fig. 11 shows a perspective view of a cover of the electronics housing from Fig. 1, a covering device which protects the inlets of the cooling channels or the cooling channels from clogging,

[0049] Fig. 12 shows a sectional view of a third embodiment of the electronics housing with cooling channel extensions projecting beyond the radial mounting plane and a blocked inlet of the cooling channel as well as with the path of heat dissipation indicated,

[0050] Fig. 13 is a perspective view of the cover of the electronics housing from Fig. 11, with the cover device removed,

[0051] Fig. 14 shows a perspective view from the bottom side of the third embodiment of the electronics housing according to the invention,

[0052] Fig. 15 shows a perspective view of the electronics housing from Fig. 14 and an electric motor in assembly and

[0053] Fig. 16 shows a sectional view of the electronics housing from Fig. 14 and the electric motor in assembly. Fig. 1 shows a perspective view from the bottom side of a first embodiment of an electronics housing 1 according to the invention. The electronics housing 1 has a partially closed bottom 2. The bottom 2 is designed to rest against a stator bushing of an electric motor - not shown in Fig. 1. Power electronics - for example semiconductor components - can be connected in a thermally conductive manner to the top side of the bottom 2. The bottom 2 has feedthrough openings 3 for motor connection cables or contacts as well as a through-opening 4 for a shaft end of the electric motor or for components for detecting the position of an air conveying element.

[0054] The electronics housing 1 has a mounting surface 6 on its base 2 for axial attachment to the stator bushing of the electric motor. The mounting surface 6 defines a mounting plane 7 extending radially to an axis of the electric motor.

[0055] An outer wall 9 is essentially circular-cylindrical. Cooling channels 10a, 10b are formed on the outer wall 9 of the electronics housing 1. These cooling channels extend in the axial direction 11 and are designed to direct a cooling air flow toward the stator bushing of the electric motor. The cooling channels 10a end at the mounting plane 7. The electronics housing 1 has cooling channel extensions 12 for the cooling air flow, which extend in the axial direction 11 beyond the radial mounting plane 7 and form an axial extension of the cooling channels 10b. The cooling channel extensions 12 are provided along the casing of the outer wall 9. Thus, a plurality of cooling channel extensions 12 are provided along a circumference of the electronics housing 1, circumferentially surrounding the electronics housing 1. Accordingly, angular distances are formed between the cooling channel extensions 12.

[0056] Fig. 2 shows a perspective view of an electric motor 15. From above, the stator bushing 20 can be seen with a base or stator bushing flange 21. The stator bushing flange 21 has feedthrough openings 23 and a through-opening 24, which correspond to the feedthrough openings 3 and the through-opening 4 of the electronics housing 1 from Fig. 1. The through-openings 3 do not necessarily have to be the same size as the through-openings 4, but should have the same position / orientation and, in other words, be opposite one another. A shaft end 25 of the electric motor 15 can be seen within the through-opening 24. A cooling wheel for cooling the electronics and / or a magnet for position detection can be attached to the shaft end 25, for example (not shown).

[0057] The electric motor 15 has a rotor bell 26. A centering diameter region 27 is schematically shown as a dashed circle. An air conveying element 28 is connected in a rotationally fixed manner to the rotor or rotor bell 26 and is delimited or covered by a cover plate 29 towards the stator bushing flange 21. Radially outwardly on the stator bushing 20 or on the stator bushing flange 21, flange sections 30 with bores 31 are formed for axial fastening to a mounting wall or supporting structure (not shown in the figures). The flange sections 30 define support ring segments and, in other words, form a support ring on the stator bushing 20—with interruptions—for the electric motor 15. The electric motor can be centered on the centering diameter region 27 during axial fastening to the supporting structure.

[0058] Fig. 3 shows a perspective view of the electronics housing 1 from Fig. 1 and the electric motor 15 from Fig. 2 in assembly. Radial connection elevations 32 are formed on the outer wall 9 of the electronics housing 1, to which the electronics housing 1 is screwed to the stator bushing flange 21. The radial connection elevations 32 lie within the centering diameter range 27 for the support structure (not shown), which is delimited by the steps in the flange sections. The areas of the outer wall 9 of the electronics housing 1 that are opposite the flange sections 30 in the axial direction 11 are free of cooling channels. The electronics housing 1 is located radially inside the flange sections 30 of the support ring. The inner diameter of the support ring is larger than the outer diameter of the electronics housing.

[0059] The cooling channel extensions 12 for the cooling channels 10b extend in the axial direction 11 beyond the radial mounting plane 7 and, in areas between the flange sections 30, protrude toward the air conveying element 20 such that an axial gap 34 is created between the cooling channel extension 12 and the air conveying element 28. The electronics housing 1 is closed by a separate, removable cover 35.

[0060] Fig. 4 shows a sectional view of the electronics housing 1 and the electric motor 15 in assembly. The rotor bell 26 is formed radially outside a stator bushing tower 38, circumferentially surrounding the stator bushing 20 and a laminated core with motor windings 39, and rotates with the shaft, the shaft end 25 of which is accessible from the electronics housing 1 through the through-openings 24, 4. The base 2 has a heat sink 41. The heat sink 41 is formed as a material accumulation in the base 2 for thermal connection to the stator bushing 20. The power electronics 43 is schematically shown arranged on the heat sink 41.

[0061] Fig. 5 shows a perspective view of the stator bushing 20 of the electric motor 1—without a laminated core or motor windings, and without a rotor bell around the stator bushing tower 38. The stator bushing flange 21 has wave-shaped ribs 45 that extend in the axial direction 11 toward the air conveying element—not shown in Fig. 5. The air exiting the cooling channel extensions of the electronics housing can be drawn radially inward between the wave-shaped ribs 45 to cool the stator.

[0062] Fig. 6 shows a detailed view from Fig. 5 in the area of ​​the cooling structure, wherein additional ribs 46 for guiding the air in the area of ​​the air outlet of the cooling channel extension - not shown in Fig. 6 - are schematically shown.

[0063] Fig. 7 shows a detailed view of Fig. 4. Schematically shown is a seal 47 between the electronics housing 1 and the stator bushing 20, which runs radially inward from the cooling channel extension 12.

[0064] The path of the cooling air from the inlet 48 of the cooling channel 10b through the air conveying element 28 is shown with arrows. When the air conveying element 28 rotates with the rotor bell 26, an air flow is generated radially outwards by the air conveying ribs 50. This creates a negative pressure at the inlet 48 of the cooling channel 10b, so that air is sucked in. The air passes through the cooling channel 10b - which is delimited on the outside by the radial cover device or wall 51 - and through the cooling channel extension 12 to the air outlet 52. There, the air exits the cooling channel extension 12 of the electronics housing 1 and is drawn radially inwards by the suction between the wave-shaped ribs 45 of the stator bushing 20. At the radially inner end 53 of the wave-shaped ribs 45, the air leaves the stator bushing 20 and enters the air conveying element 28.In the air conveying element 28, the air then passes radially outwards through the air conveying ribs 50 and is expelled in the radial direction on the outside of the air conveying element 28.

[0065] Fig. 8 essentially corresponds to Figure 7. In addition to the path of the cooling air, arrows indicate the path of heat dissipation from the power electronics 43 through the heat sink 41 in the base 2 of the electronics housing 1 and through the stator bushing flange 21 to the path of the cooling air. The cooling channel extension 12 is partially closed axially in the area of ​​the air outlet 52 because the radial cover device has a radially inwardly directed elevation in the form of a deflection projection at the air outlet 52. The heat transfer between the stator bushing 20 and the heat sink 41 is promoted by the use of a schematically illustrated thermal interface material 54 between the stator bushing and the electronics housing 1 in the area of ​​the heat sink.

[0066] According to Fig. 7 and 8, the cooling channel extension 12 is formed integrally with the outer wall 9 of the electronics housing.

[0067] Fig. 9, in contrast, shows a design variant of a cooling channel extension 12, which is designed as a separate component and can be attached radially to the outside of the electronics housing 1. Three cooling channel extensions 10b are each designed as a cooling channel segment 55 along a segment ring 56. The cooling channel segment 55 has openings 57 on the segment ring in the direction of the cooling channels 10b in the outer wall 9 of the electronics housing 1.

[0068] Fig. 10 shows a sectional view of a second embodiment of the electronics housing 1 with electric motor 15 and largely corresponds to Fig. 7. In contrast to the first embodiment, the cooling channel 10b of the electronics housing 1 initially axially encounters a stepped surface 60 on the stator bushing flange 21. This additionally cools the stepped surface 60 in the stator bushing flange 21. The stepped surface 60 has—similar to what can be seen in Fig. 6—additional ribs 46.

[0069] Fig. 11 shows a perspective view of the cover 35, which is integrally integrated into the electronics housing 1. A cover device 62 is visible, which protects the inlets 48 of the cooling channels from blockages, preventing cooling air from entering them. The cover device 62 has a plurality of circular-cylindrical pins, or in other words, knobs 63. The cover device can preferably be made of a material with good thermal conductivity. In addition, the enlarged surface area provided by the knobs can contribute to improved heat dissipation.

[0070] Fig. 12 shows a sectional view of a third embodiment of the electronics housing 1 with cooling channel extensions 12 projecting beyond the radial mounting plane 7. The electronics housing 1 has the covering device 62 according to Fig. 11 at the inlet 48 of the cooling channel 10b. A blockage 65 is shown schematically on the covering device 62. In practice, the blockage 65 can occur, for example, in the form of leaves or foliage or similar foreign objects. The inlet 48 of the cooling channel 10b is covered at the top by the blockage 65, so that the intake of cooling air at the inlet 48 is impeded. The knobs 63 of the covering device 62 form bypass channels in all directions, so that air can flow from all directions between the knobs 63, in this case particularly in the lateral radial direction. The path of the cooling air is indicated by arrows.

[0071] The heat sink 41 is formed in the cover 35 or in the electronics housing 1. The heat sink 41 is designed as an accumulation of material in the cover 35 or in the electronics housing 1 for thermal connection to the cooling channels 10b. The power electronics 43 is shown schematically arranged on the heat sink 41. The path of heat dissipation from the power electronics 43 through the heat sink 41 in the cover 35 of the electronics housing 1 to the path of the cooling air or the cooling channel 10b is shown with arrows. Fig. 13 shows the perspective view of the cover 35 of the electronics housing from Fig. 11 , wherein the covering device is removed and not shown. The underlying ribs of the electronics housing 1, which form the cooling channels 10b and their inlets 48, can be seen.

[0072] Fig. 14 corresponds essentially to Fig. 1 and shows a perspective view from the bottom side of the third embodiment of the electronics housing 1 according to the invention. The electronics housing 1 has no bottom, the heat sink 41 is formed in the cover 35.

[0073] Fig. 15 essentially corresponds to Fig. 3 and shows a perspective view of the electronics housing from Fig. 14 and the electric motor 15 in assembly. Part of the cover 35 is designed as a removable terminal compartment cover 67.

[0074] Fig. 16 corresponds essentially to Fig. 4 and shows in a sectional view the electronics housing from Fig. 14 and the electric motor 15 in assembly.

[0075] With regard to further advantageous embodiments of the device according to the invention, reference is made to the general part of the description and to the appended claims in order to avoid repetition.

[0076] Finally, it should be expressly pointed out that the embodiments of the device according to the invention described above serve only to explain the claimed teaching, but do not limit it to the embodiments.

[0077] List of reference symbols

[0078] 1 electronics housing

[0079] 2 floor

[0080] 3 feed-through openings

[0081] 4 passage opening

[0082] 6 Mounting surface

[0083] 7 mounting level

[0084] 9 Exterior wall

[0085] 10 cooling channel

[0086] 11 axial direction

[0087] 12 Cooling channel extension

[0088] 15 Electric motor

[0089] 20 Stator bushing

[0090] 21 Stator bushing flange

[0091] 23 feedthrough openings

[0092] 24 passage opening

[0093] 25 Shaft end

[0094] 26 Rotor bell

[0095] 27 centner diameter range

[0096] 28 Air conveyor element

[0097] 29 Cover plate

[0098] 30 flange section

[0099] 31 bore

[0100] 32 Connection increase

[0101] 34 gap

[0102] 35 lids

[0103] 38 Stator bushing tower

[0104] 39 laminated core with motor windings

[0105] 41 heat sinks

[0106] 43 Power electronics

[0107] 45 wavy ribs

[0108] 46 Additional rib entrance

[0109] Air conveying ribs

[0110] Radial cover device air outlet

[0111] Radial inner end Interface material Cooling channel segment Segment ring Opening

[0112] Offset surface covering device knobs

[0113] constipation

[0114] Terminal compartment cover

Claims

Claims 1. Electronics housing (1) for an electric motor (15), wherein the electronics housing (1) has a mounting surface (6) for axial fastening to a stator bushing (20) of the electric motor (15), wherein the mounting surface (6) defines a mounting plane (7) extending radially to an axis of the electric motor (15), wherein at least one cooling channel (10a, 10b) is formed on an outer wall (9) of the electronics housing (1), which cooling channel extends at least partially in the axial direction (11) and is designed to guide a cooling air flow towards the stator bushing (20) of the electric motor (15), characterized in that the electronics housing (1) has a cooling channel extension (12) for the cooling air flow, which extends in the axial direction (11) beyond the radial mounting plane (7) and forms an axial extension of the cooling channel (10b).

2. Electronics housing (1) according to claim 1, wherein the cooling channel extension (12) has a wall (51) which delimits the cooling channel (10b) radially outwards and / or inwards, wherein the wall (51) can preferably be arranged as a separate part on the cooling channels (10a, 10b).

3. Electronics housing (1) according to one of claims 1 or 2, wherein the cooling channel extension (12) is at least partially closed axially in the region of an air outlet (52).

4. Electronics housing (1) according to one of claims 1 to 3, wherein the cooling channel extension is formed as a component separate from the electronics housing (1).

5. Electronics housing (1) according to one of claims 1 to 4, wherein a seal (47) extending substantially along the mounting plane (7) between the electronics housing (1) and the stator bushing (20) radially inward from the cooling channel extension (12).

6. Electronics housing (1) according to one of claims 1 to 5, further comprising a substantially radially extending base (2) and / or cover (35).

7. Electronics housing (1) according to one of claims 1 to 6, wherein the base (2) and / or cover (35) has a heat sink (41), wherein a thermal interface material (54) is preferably arranged between the base (29), in particular in a region of the heat sink (41), and the stator bushing (20).

8. Electronics housing (1) according to one of claims 1 to 7, wherein the electronics housing (1) has a covering device (62) at an inlet (48) of the cooling channel (12), which covering device protects the inlet (48) of the cooling channel (10a, 10b) from the fact that no more cooling air can reach the inlet in the event of blockages (65).

9. Cover device (62) for an electronics housing according to claim 8, wherein the cover device (62) has a plurality of circular cylindrical pins and / or a wave-shaped profile.

10. Electric motor (15) comprising an electronics housing (1) according to one of claims 1 to 8.

11. Electric motor (15) according to claim 10, further comprising a stator with a stator bushing (20) and a rotor with a rotor bell (26), wherein the rotor bell (26) is formed radially outside a stator bushing tower (38) around the stator bushing (20), wherein flange sections (30) are formed radially outside on the stator bushing (20) for axial fastening to a fastening wall or supporting structure.

12. Electric motor according to claim 10 or 11, wherein the cooling channel extensions (12) are arranged in a direction circumferential around a circumference of the electronics housing (1) between the flange sections (30) for axially fastening the stator bushing (20), wherein the cooling channel extensions (12) are preferably arranged radially within a diameter range defined by the flange sections (30) or a support ring.

13. Electric motor (15) according to one of claims 10 to 12, wherein the cooling channel extension (12) extends in the axial direction beyond the radial mounting plane (7) to an air conveying element (28) rotating with the rotor in such a way that an axial gap (34) is formed between the cooling channel extension (12) and the air conveying element (28), preferably between the cooling channel extension (12) and a cover plate of the air conveying element.

14. Electric motor (15) according to one of claims 10 to 12, wherein Areas of the outer wall (9) of the electronics housing (1 ) which are opposite the flange sections (30) in the axial direction (11 ) are free of cooling channels.

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