Electric machine having fan, stator housing part, first bearing cap and second bearing cap

Abstract

The utility model relates to a motor with a fan, a stator housing part, a first bearing cap and a second bearing cap, the stator housing part is arranged between the first bearing cap and the second bearing cap, and the fan is arranged on the motor. The air flow conveyed by the fan at least points to the deflection recess of the first bearing cover and points to the through-passage through the outer wall region of the stator housing part, and the stator housing part has a first axially penetrating channel and a second axially penetrating channel. The deflection notch deflects part of the air flow conveyed by the fan in the radial direction to the axial direction and supplies the air flow to the second channel, so that the part of the air flow is discharged into the surrounding air after passing through the second channel. The portion of the air flow conveyed by the fan, which is conveyed via the passage, is fed to the first channel and flows into the motor interior region surrounded by the second bearing cover, and then at least partially flows back to the motor interior region surrounded by the first bearing cover through an annular gap between the stator lamination stack and the rotor.

Description

Technical Field

[0001] The utility model relates to a motor with a fan, a stator housing component, a first bearing cover and a second bearing cover. Background Art

[0002] It is well known that the heat losses of electric motors must be transferred to the surrounding environment, for example by water cooling. Utility Model Content

[0003] The object of the present invention is therefore to improve an electric machine in which improved heat dissipation can be achieved.

[0004] According to the present invention, this object is achieved by an electric machine according to the following features.

[0005] In an electric machine having a stator housing component, a first bearing cover and a second bearing cover, an important feature of the utility model is that the stator housing component is arranged between the first bearing cover and the second bearing cover.

[0006] Among them, a fan is arranged on the motor.

[0007] The air flow conveyed by the fan is directed at least toward a deflection recess / deflection pocket of the first bearing shield formed next to the stator housing part and toward a passage / ventilation opening, in particular a notch, which penetrates—in particular radially—through an outer wall region of the stator housing part.

[0008] The stator housing component has a plurality of axially penetrating first channels and a plurality of axially penetrating second channels.

[0009] The deflection recess deflects a portion of the air flow delivered by the fan, particularly in the radial direction, toward the axial direction and supplies the portion to the second channel, so that the portion of the air flow is discharged from the second channel into the ambient air after flowing through the second channel.

[0010] In this case, a portion of the air flow delivered by the fan and delivered via the passage portion is supplied to the first channel and flows into an interior space region of the motor surrounded by the second bearing cover, and then at least partially flows back into the interior space region of the motor surrounded by the first bearing cover through an annular gap between a stator laminated core received in a stator housing component and a rotor rotatably supported via a bearing, in particular a rolling bearing, received in the bearing cover.

[0011] An advantage here is that a depression is formed next to the stator housing part, which depression is used as a deflection notch and thus a part of the air flow is fed to the second channel along the outside of the stator housing part. Another part of the air flow is guided through the interior area, in particular through the first channel. In this way, on the one hand, the stator housing part is cooled by the external air flow, which is however also guided through the stator housing part, and on the other hand, an air circulation is caused in the interior area, so that the heat is diffused in the interior area, in particular over the entire inner surface of the interior area. Since the second channel has a larger cross-sectional area overall than the first channel, an efficient heat transfer to the surroundings is achieved. Therefore, the heat transfer efficiency of the interior area is lower than the heat transfer to the surroundings.

[0012] In an advantageous embodiment, the first channel and the second channel are formed in a corner region of the stator housing part and the radial distance between the first channel and the second channel is greater than the smallest outer radius of the stator housing part. This has the advantage that the square outer contour and the received cylindrical stator core form a radially protruding corner region, in particular an axial edge region, in which the channel can be received without requiring additional space.

[0013] In an advantageous embodiment, the stator core is received in a cylindrical recess of a stator housing part.

[0014] The stator housing part has a square outer periphery.

[0015] In particular, the minimum outer radial distance of the stator housing part is greater than the outer radius of the stator core, in particular the minimum outer radial distance of the stator housing part exceeds the outer radius of the stator core by the minimum wall thickness of the stator housing part,

[0016] In particular, the first and second channels are arranged in, in particular in four, corner regions of a cross section of a stator housing part, which has a normal direction parallel to the axial direction. This has the advantage that radially protruding corner regions, in particular axial edge regions, are formed by the square outer contour and the received cylindrical stator core, in which the channels can be received without requiring additional space.

[0017] In an advantageous embodiment, the first channel is arranged between the second channels in the circumferential direction. This has the advantage that heat diffusion takes place in the second channels in the circumferential direction.

[0018] In an advantageous embodiment, at least one second channel has a triangular cross section, and the corresponding triangle, in particular the triangular cross section, extends in a circumferential direction greater than in a radial direction. This has the advantage that the corner regions can be optimally utilized.

[0019] In an advantageous embodiment, the first channels and second channels designed as round holes are arranged in the circumferential direction between the second channels having a triangular cross section. The advantage here is that the corner regions can be optimally utilized.

[0020] In an advantageous embodiment, the air flow portion diverted by the deflection recess is separated from the spatial region surrounded by the first bearing shield by a recess wall side of the deflection recess. The advantage here is that the two portions of the air flow are guided separately from each other.

[0021] In an advantageous embodiment, at least one further through-opening, in particular a radial through-opening, in particular a through-opening, in an outer wall region of the stator housing part is covered by the inspection window.

[0022] The inspection window has a continuous grille opening, in particular a slot, through which an air flow is discharged in part from the interior area into the surrounding air.

[0023] Particularly wherein, the inspection window is fixed on the stator housing component by means of a screw. Advantage is here that the air flow part can flow out, and people's fingers cannot enter the inner space region.

[0024] In an advantageous embodiment, the inspection window is manufactured as a plastic injection molded part. This has the advantage that, in particular, cost-effective manufacturing is possible despite complex geometries. For example, a rainproof sloping roof can be provided at each grille opening.

[0025] In an advantageous embodiment, the stator housing part is a processed metal casting. This has the advantage that the stator can be designed to be robust / stable.

[0026] In an advantageous embodiment, the total cross section of the first channel is smaller than the total cross section of the second channel.

[0027] The advantage here is that the heat can be dissipated efficiently, in particular more efficiently than heat diffusion.

[0028] The utility model is not limited to the above-mentioned feature combination. For those skilled in the art, in particular, other reasonable combinations of the above-mentioned feature combination and / or individual features and / or features to be described below and / or features of the accompanying drawings can be obtained from the purpose proposed and / or the purpose proposed by comparison with the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The utility model is described in detail below according to the accompanying drawings:

[0030] Figure 1 The first bearing shield 3 of the electric machine according to the present invention is shown in an oblique view.

[0031] Figure 2 The stator housing of an electric machine is shown in an oblique view.

[0032] Figure 3 The second bearing shield 30 of the electric machine is shown in an oblique view.

[0033] Figure 4 One of the inspection windows 40 of the electric machine is shown in an oblique view.

[0034] List of reference numerals:

[0035] 1 First pass

[0036] 2 Deflection notch

[0037] 3 First bearing cap

[0038] 20 Stator housing parts

[0039] 21 First Channel

[0040] 22 Second channel

[0041] 23 Stator lamination stack

[0042] 30 Second bearing cap

[0043] 40 Inspection window

[0044] 41 Grille opening DETAILED DESCRIPTION

[0045] As shown in the figures, the electric machine has a stator, wherein a stator housing part 20 of the stator is arranged axially between a first bearing shield 3 and a second bearing shield 30. A stator laminated core 23 is arranged in the stator housing part 20, which comprises single metal sheets stacked in the axial direction.

[0046] The bearings are respectively received in the two bearing covers 3 , 30 , and a rotor shaft (not shown in the drawings) is rotatably supported by the bearings.

[0047] The stator winding, in particular a three-phase winding, is accommodated in the stator core 23 , in particular in axially extending slots of the stator core.

[0048] The two bearing shields 3 , 30 are preferably pressed onto the stator housing part 20 by means of long screws.

[0049] The two bearing shields 3 , 30 together with the stator housing part 20 form the housing of the electric machine, wherein the fan is mounted on the housing.

[0050] The air flow conveyed by the fan is directed toward a first, in particular radial, passage 1 of the first bearing shield 3 and toward the deflection recess 2 of the first bearing shield 3 .

[0051] The first passage 1 is a recess in the outer wall of the first bearing shield 3 , which enables the conveyed air flow to flow into the interior of the electric machine enclosed by the housing.

[0052] Since the stator housing component 20 has the first channel 21 which penetrates axially, the air flow flowing in through the first passage 1 flows through the first channel 21, which leads to the inner space surrounded by the second bearing cover 30. The air flow can flow back from the inner space surrounded by the second bearing cover through the annular gap between the stator laminated core 23 and the rotor radially arranged inside the stator laminated core 23 to the inner space region surrounded by the first bearing cover 3.

[0053] Further recesses are present on the second bearing cap 30 , which are covered by an inspection window 40 having a grille opening 41 , in particular a slit. Therefore, part of the conveyed air flow flows through the grille opening 41 into the external environment.

[0054] The deflection recess 2 formed on the first bearing cover 3 deflects the radially inflowing air toward the axial direction outside the inner space surrounded by the first bearing cover 3, so that the air enters the second channel 22, which is introduced into the stator housing component 20 and passes through the stator housing component 20 in the axial direction. The air flow flowing out of the second channel 22 is deflected toward the radial direction through the deflection recess 2 correspondingly formed on the second bearing cover 30, and thus enters the surrounding air.

[0055] It is important in the present invention that the first channel 21 and the second channel 22 are each arranged in a corner region of the stator housing part 20 , which is designed so that the stator laminated core is received in an inner cylindrical recess of the stator housing part and the outer contour of the stator housing part 20 is substantially rectangular.

[0056] The stator housing part 20 has a radial minimum wall thickness on its outer side, but the wall thickness in the corner regions exceeds this minimum wall thickness because the cuboid comprises an inner cylindrical part and the corner regions therefore protrude radially beyond the inner cylindrical part taking into account the minimum wall thickness.

[0057] Preferably, two deflection recesses are arranged in each of the four corner regions, wherein the respective first channel 21 is arranged between the two deflection recesses in the circumferential direction.

[0058] The first channel 21 is designed as a circular hole. The second channel 22 is also designed as a circular hole, wherein there is also a second channel 22 having a triangular cross section.

[0059] Particularly preferably, in each corner region, all first channels 21 and second channels 22 designed as round holes are arranged in the circumferential direction between second channels designed to have a triangular cross section.

[0060] Preferably, the triangular cross section of the second channel 22 is oriented such that the respective triangle has a greater extension in the circumferential direction than in the radial direction. Thus, a particularly efficient utilization of the spatial area available in the respective corner region can be achieved.

[0061] The axial direction is parallel to the rotation axis of the rotor. The circumferential direction is also based on the rotation axis of the rotor. The radial direction is also based on the rotation axis of the rotor.

[0062] According to another embodiment of the present invention, the first channel 21 and the second channel 22 are not arranged in the stator housing component 20, but are arranged in the stator lamination stack 23, or are arranged in the stator lamination stack 23 in addition to being arranged in the stator housing component 20. For this purpose, the radial minimum wall thickness of the stator lamination stack 23 is increased accordingly.

Claims

1. An electric machine having a fan, a stator housing component, a first bearing cover and a second bearing cover, The stator housing component is arranged between the first bearing cap and the second bearing cap, The fan is arranged on the housing of the motor. It is characterized in that The air flow conveyed by the fan is directed at least toward the deflection recess of the first bearing shield formed next to the stator housing part and toward a passage extending radially through the outer wall region of the stator housing part. The stator housing component has a plurality of axially penetrating first channels and a plurality of axially penetrating second channels. The deflection recess deflects a portion of the air flow delivered by the fan in the radial direction into the axial direction and supplies the air flow to the second passage, so that the portion of the air flow is discharged from the second passage into the ambient air after flowing through the second passage. The part of the air flow delivered by the fan delivered via the through-portion is supplied to the first channel and flows into the inner space area of ​​the motor surrounded by the second bearing cover, and then at least partially flows back into the inner space area of ​​the motor surrounded by the first bearing cover through the annular gap located between the stator laminated core and the rotor, the stator laminated core being received in the stator housing part, and the rotor being rotatably supported via a bearing received in the bearing cover.

2. The electric machine according to claim 1, comprising a fan, a stator housing part, a first bearing cover and a second bearing cover, It is characterized in that The passage which penetrates radially through the outer wall region of the stator housing part is a recess.

3. The electric machine according to claim 1, comprising a fan, a stator housing part, a first bearing cover and a second bearing cover, It is characterized in that The bearing is a rolling bearing.

4. An electric machine according to any one of claims 1 to 3, comprising a fan, a stator housing part, a first bearing shield and a second bearing shield, It is characterized in that The first channel and the second channel are machined in a corner region of the stator housing part, the radial distance between the first channel and the second channel being greater than the smallest outer radius of the stator housing part.

5. An electric machine according to any one of claims 1 to 3, comprising a fan, a stator housing part, a first bearing shield and a second bearing shield, It is characterized in that The stator lamination stack is received in a cylindrical recess of the stator housing component. The stator housing part has a square outer circumference.

6. The electric machine according to claim 5, comprising a fan, a stator housing part, a first bearing cap and a second bearing cap, It is characterized in that The smallest outer radial distance of the stator housing parts is greater than the outer radius of the stator laminated core.

7. The electric machine according to claim 6, comprising a fan, a stator housing part, a first bearing cap and a second bearing cap, It is characterized in that The smallest outer radial distance of the stator housing part exceeds the outer radius of the stator laminated core by the smallest wall thickness of the stator housing part.

8. The electric machine according to claim 5, comprising a fan, a stator housing part, a first bearing cap and a second bearing cap, It is characterized in that The first channel and the second channel are arranged in a corner region of a cross section of the stator housing part, the normal direction of the cross section of the stator housing part being parallel to the axial direction.

9. The electric machine according to claim 8, comprising a fan, a stator housing part, a first bearing cap and a second bearing cap, It is characterized in that The first channel and the second channel are arranged in four corner regions of the stator housing part.

10. An electric machine according to any one of claims 1 to 3, comprising a fan, a stator housing part, a first bearing shield and a second bearing shield, It is characterized in that The first channels are arranged between the second channels in the circumferential direction.

11. An electric machine according to any one of claims 1 to 3, comprising a fan, a stator housing part, a first bearing shield and a second bearing shield, It is characterized in that At least one second channel has a triangular cross section, and an extension dimension of the corresponding triangular cross section in the circumferential direction is larger than that in the radial direction.

12. The electric machine according to claim 11, comprising a fan, a stator housing part, a first bearing cap and a second bearing cap, It is characterized in that The first channel and the second channel designed as round holes are arranged in the circumferential direction between the second channel having a triangular cross section.

13. An electric machine according to any one of claims 1 to 3, comprising a fan, a stator housing part, a first bearing shield and a second bearing shield, It is characterized in that The air flow portion deflected by the deflecting recess is separated from the spatial region enclosed by the first bearing shield by means of a recess wall side of the deflecting recess.

14. An electric machine according to any one of claims 1 to 3, comprising a fan, a stator housing part, a first bearing shield and a second bearing shield, It is characterized in that at least one further radial through-passage of the outer wall region of the stator housing part is covered by the inspection window, The inspection window has a through-going grille opening through which a portion of the air flow is discharged from the interior space region into the surrounding air. The inspection window is fastened to the stator housing part by means of screws.

15. The electric machine according to claim 14, comprising a fan, a stator housing part, a first bearing cap and a second bearing cap, It is characterized in that The grille openings are slits.

16. The electric machine according to claim 14, comprising a fan, a stator housing part, a first bearing cap and a second bearing cap, It is characterized in that The inspection window is manufactured as a plastic injection-molded part.

17. An electric machine according to any one of claims 1 to 3, comprising a fan, a stator housing part, a first bearing shield and a second bearing shield, It is characterized in that The stator housing components are machined metal castings.

18. An electric machine according to any one of claims 1 to 3, comprising a fan, a stator housing part, a first bearing shield and a second bearing shield, It is characterized in that The total cross-section of the first channel is smaller than the total cross-section of the second channel.

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