Welding equipment for stator shell of axial flux motor
The problem of welding difficulty in axial flux motor stator housing and middle end cover is solved through laser welding equipment, and efficient and low-cost automated production is achieved, suitable for large-scale production and reduce production costs.
Patent Information
- Application Number
- CN202422008548.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-19
- Publication Date
- 2025-07-22
- Estimated Expiration
- 2034-08-19
AI Technical Summary
In the prior art, it is difficult to weld small round holes such as the shell of the axial flux motor stator shell and bolt holes in the middle of the end cover, the friction stir welding yield is low, the production efficiency is low, and it is not suitable for large-scale production. It also requires special fixtures and tools, resulting in high production costs.
Laser welding equipment is adopted to emit laser beams to the position to be welded through the laser head, combined with the driving mechanism and positioning tooling, automatic welding of the shell and the end cap is realized. It is suitable for the joint position between the outer edge of the end cap and the shell, perforation and the boss, avoid direct contact and reduce welding difficulty and cost.
It improves welding yield, increases production efficiency, is suitable for large-scale production, reduces production costs, realizes automated production, and ensures welding consistency and quality.
Smart Images
Figure CN223129594U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of axial flux motors, in particular to a welding device for a stator housing of an axial flux motor. Background Art
[0002] Like traditional radial flux motors, axial flux motors will also generate a large amount of heat during operation due to current effects, magnetic field change losses, mechanical friction, etc. In order to maintain the stable operation of the motor within a safe temperature range and ensure its performance and lifespan, effective cooling is required. Currently, most axial flux motors ensure stable operation within a safe temperature range through liquid cooling. Specifically, in the prior art, a stator housing is formed by assembling a housing and end caps sealed at its ends. The stator housing is used to enclose and fix a stator assembly (including a stator core, windings, etc.), and a coolant chamber is formed inside it. The stator assembly is directly placed in the coolant chamber or in a position adjacent to the coolant chamber, so that when the coolant circulates, heat dissipation of the stator assembly is carried out.
[0003] From the above, during the production process of the stator housing, it is necessary to ensure reliable sealed connection between the housing and the end caps to prevent coolant leakage. Currently, friction stir welding (FSW) is the mainstream sealed connection method. Specifically, friction stir welding uses a high-speed rotating welding head to generate frictional heat at the joint of the housing and the end caps, making the materials at the joint of the two in a plastic state, and then through the stirring action of the welding head, the two parts of the materials are fused together to form a dense solid-phase weld seam, thereby ensuring reliable sealed connection between the housing and the end caps.
[0004] However, based on its operation characteristics, friction stir welding is more suitable for long straight welds, such as the peripheral connection of the housing and the end caps. For small round holes such as bolt holes in the middle of the housing and the end caps, the welding difficulty is relatively large and the yield is relatively low. In addition, the welding speed of friction stir welding is slow, the production efficiency is low, and it is not suitable for mass production of stator housings. Moreover, using friction stir welding also requires preparing special fixtures and tools to ensure that the positions and postures of the housing and the end caps remain unchanged during the welding process, resulting in relatively high production costs. Summary of the Utility Model
[0005] The purpose of the utility model is to provide a welding device for a stator housing of an axial flux motor to solve the problems that for small round holes such as bolt holes in the middle of the housing and the end caps, the welding difficulty of friction stir welding is relatively large and the yield is relatively low. In addition, the welding speed of friction stir welding is slow, the production efficiency is low, and it is not suitable for mass production of stator housings. Moreover, using friction stir welding also requires preparing special fixtures and tools to ensure that the positions and postures of the housing and the end caps remain unchanged during the welding process, resulting in relatively high production costs.
[0006] To achieve this purpose, the utility model adopts the following technical solutions:
[0007] A welding device for the stator housing of an axial flux motor, the stator housing includes a housing and an end cover sealed at the end of the housing, and the welding device for the stator housing of the axial flux motor includes:
[0008] A machine table configured to carry the stator housing pre-assembled from the housing and the end cover;
[0009] A laser head configured to emit a laser beam to the position to be welded on the stator housing; and
[0010] A driving mechanism configured to drive the laser head to move along a preset trajectory.
[0011] Preferably, the welding device for the stator housing of the axial flux motor further includes a positioning tooling, the positioning tooling is configured to position the stator housing, and the machine table is configured to carry the positioning tooling.
[0012] Preferably, at least two first positioning holes are provided on the positioning tooling. For any one of the first positioning holes, a second positioning hole is provided on the machine table, and the positioning tooling is positioned on the machine table by a first pin inserted through the first positioning hole and the second positioning hole.
[0013] Preferably, a plurality of the second positioning holes are provided on the machine table, and the plurality of the second positioning holes are arranged in a matrix.
[0014] Preferably, a positioning structure is provided on the positioning tooling, the positioning structure includes at least two third positioning holes, and at least two of the third positioning holes are in one-to-one correspondence with at least two bolt holes on the stator housing, and the stator housing is positioned on the positioning tooling by a second pin passing through the bolt holes and the third positioning holes.
[0015] Preferably, the positioning tooling includes more than two of the positioning structures. For any one of the positioning structures, at least two of the third positioning holes define a placement area suitable for carrying the stator housing, and the areas of the placement areas defined by any two of the positioning structures are different.
[0016] Preferably, both the housing and the end cover are made of aluminum.
[0017] Preferably, the driving mechanism includes a first driving module and a second driving module, the first driving module is configured to drive the laser head to move along a first horizontal direction, and the second driving module is configured to drive the laser head to move along a second horizontal direction perpendicular to the first horizontal direction.
[0018] Preferably, the driving mechanism further includes a third driving module configured to drive the laser head to lift in the vertical direction.
[0019] Preferably, the welding device for the axial flux motor stator housing further includes a housing that covers the upper part of the machine table, and an inert gas is introduced into the housing.
[0020] Advantages of the present utility model:
[0021] In the present utility model, laser welding is used to hermetically connect the housing and the end cover. Since laser welding only needs to emit a laser beam to the position to be welded without direct contact with the position to be welded, laser welding can be applied not only to welding the joint position between the outer peripheral edge of the end cover and the housing, but also to welding the joint position between the perforation and the boss. The welding difficulty is low and the yield is relatively high. In addition, the welding speed of laser welding is relatively fast, which can improve production efficiency and thus be applicable to mass production of stator housings. Moreover, since the laser head does not need to directly contact the position to be welded, there is no need to prepare special jigs and tools to clamp the stator housing to avoid changes in the position and posture of the stator housing during the welding process, thereby reducing production costs. Description of the drawings
[0022] Figure 1 is a schematic structural view of the stator housing in an embodiment of the present utility model;
[0023] Figure 2 is an exploded view of the stator housing in an embodiment of the present utility model;
[0024] Figure 3 is a schematic structural view of the welding device for the axial flux motor stator housing in an embodiment of the present utility model;
[0025] Figure 4 is a schematic structural view of the welding device for the axial flux motor stator housing excluding the housing in an embodiment of the present utility model;
[0026] Figure 5 is a schematic structural view of the positioning tooling in an embodiment of the present utility model.
[0027] In the figure:
[0028] 110. Housing; 111. Coolant chamber; 112. Partition piece; 1121. Boss; 11211. Bolt hole; 120. End cap; 121. Perforation; 130. Bolting hole; 210. Machine table; 211. Second positioning hole; 220. Laser head; 230. Driving mechanism; 231. First driving module; 232. Second driving module; 233. Third driving module; 240. Positioning tooling; 241. First positioning hole; 242. Third positioning hole; 250. Machine shell; 251. Observation window. Detailed implementation manners
[0029] The present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present utility model, rather than limiting the present utility model. Additionally, it should be noted that for the sake of description, only parts related to the present utility model rather than all structures are shown in the accompanying drawings.
[0030] In the description of the present utility model, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.
[0031] In the present utility model, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "over", and "on" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "under", and "beneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.
[0032] In the description of this embodiment, the orientation or positional relationships such as "above", "below", "right", and "left" are based on the orientation or positional relationships shown in the accompanying drawings. They are only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meanings.
[0033] Such as Figure 1 AndFigure 2 As shown in Figure 2 , the stator housing of the axial flux motor includes a housing 110 and an end cover 120 sealed at the end of the housing 110. Specifically, a coolant chamber 111 is formed inside the housing 110, and a plurality of partition plates 112 are arranged in the coolant chamber 111. The end cover 120 is supported on the partition plates 112, and the housing 110 is sleeved on the outer periphery of the end cover 120. The partition plates 112 are used to form a serpentine flow path in the coolant chamber 111. Exemplarily, in this embodiment, the stator assembly is arranged in an installation cavity adjacent to the coolant chamber 111, and the coolant flowing along the serpentine flow path can dissipate heat from the stator assembly. In addition, some partition plates 112 are provided with bosses 1121, and corresponding through holes 121 are provided on the end cover 120. The bosses 1121 can pass through the through holes 121 and protrude, and bolt holes 11211 are provided on the bosses 1121 for fastening bolts to penetrate from the outside to fasten the stator assembly in the stator housing.
[0034] Based on the above, to ensure the reliable sealed connection between the housing 110 and the end cover 120, it is necessary to weld the joint part between the end cover 120 and the housing 110, that is, it is necessary to weld the joint position between the outer peripheral edge of the end cover 120 and the housing 110 and the joint position between the through hole 121 and the boss 1121, so as to seal the coolant chamber 111 and thus avoid coolant leakage.
[0035] For this reason, please refer to Figures 3 to 5 , this embodiment provides a welding device for the stator housing of an axial flux motor. The welding device for the stator housing of the axial flux motor includes a machine table 210, a laser head 220 and a driving mechanism 230. Among them, the machine table 210 is configured to carry the stator housing pre-assembled by the housing 110 and the end cover 120, the laser head 220 is configured to emit a laser beam to the position to be welded on the stator housing, and the driving mechanism 230 is configured to drive the laser head 220 to move along a preset trajectory.
[0036] Based on the above-mentioned content, in this embodiment, the housing 110 and the end cover 120 are first pre-assembled together, that is, the end cover 120 is first pre-assembled onto the housing 110 to form the stator housing. Then, the pre-assembled stator housing is placed on the machine table 210. The laser head 220 can emit a laser beam to the stator housing placed on the machine table 210, and the driving mechanism 230 can drive the laser head 220 to move along a preset trajectory, so as to weld the joint position between the outer peripheral edge of the end cover 120 and the housing 110 and the joint position between the through hole 121 and the boss 1121.
[0037] Thus, in this embodiment, the housing 110 and the end cap 120 are hermetically connected by laser welding. Since laser welding only needs to emit a laser beam to the position to be welded without direct contact with the position to be welded, laser welding can be applied not only to weld the joint position between the outer peripheral edge of the end cap 120 and the housing 110, but also to weld the joint position between the perforation 121 and the boss 1121. The welding difficulty is low and the yield is relatively high. In addition, the welding speed of laser welding is relatively fast, which can improve the production efficiency and thus be applicable to mass production of the stator housing. Furthermore, since the laser head 220 does not need to be in direct contact with the position to be welded, there is no need to prepare special jigs and tools to clamp the stator housing to avoid the change of the position and posture of the stator housing during the welding process, thereby reducing the production cost.
[0038] It can be understood that the movement trajectory of the laser head 220 can be controlled by components such as a controller to ensure the consistency during the mass production process. Moreover, in this embodiment, laser welding does not require manual participation, thus realizing automated production and further improving the production efficiency.
[0039] It should be noted that since the specific structure and working principle of the laser head 220 are prior arts, they will not be elaborated in this embodiment.
[0040] In addition, it should also be noted that in this embodiment, both the housing 110 and the end cap 120 are made of aluminum, which has the characteristics of light weight and easy processing, and the aluminum has good thermal conductivity and corrosion resistance, thus facilitating the hermetic connection between the housing 110 and the end cap 120 by laser welding.
[0041] Furthermore, the welding equipment for the axial flux motor stator housing further includes a machine housing 250. The machine housing 250 covers the upper part of the machine table 210, and an inert gas is passed through the inside of the machine housing 250 to provide a gas protection environment during the welding process, so as to avoid the influence on the welded part due to oxidation during the welding process, and further improve the yield.
[0042] It is worth noting that the inert gas can be helium or argon, etc., and no specific limitation is made in this embodiment.
[0043] In addition, an observation window 251 is provided on the machine housing 250, which is convenient for the staff to observe the welding process and thus monitor the welding process.
[0044] Even further, the welding equipment for the axial flux motor stator housing further includes a positioning tooling 240. The positioning tooling 240 is configured to position the stator housing, and the machine table 210 is configured to carry the positioning tooling 240, which is convenient for the laser head 220 to determine the starting point and further ensure the consistency during the mass production process.
[0045] Based on the above, in this embodiment, only the stator housing needs to be positioned, and there is no need to tightly fix the stator housing by a special fixture or tool during the welding process.
[0046] In addition, at least two first positioning holes 241 are provided on the positioning tooling 240. For any one of the first positioning holes 241, a second positioning hole 211 is provided on the machine table 210. That is, when the positioning tooling 240 is placed on the machine table 210, all the first positioning holes 241 on the positioning tooling 240 correspond to a second positioning hole 211. The positioning tooling 240 is positioned on the machine table 210 through a first pin (not shown in the figure) inserted into the first positioning hole 241 and the second positioning hole 211, so as to position the positioning tooling 240, and further accurately position the stator housing.
[0047] Exemplarily, in this embodiment, a first positioning hole 241 is provided at each of the four corners of the positioning tooling 240. When the positioning tooling 240 is placed on the machine table 210, all four first positioning holes 241 correspond to a second positioning hole 211. A first pin is inserted into each set of the first positioning hole 241 and the second positioning hole 211, so as to position the positioning tooling 240 on the machine table 210.
[0048] Furthermore, a plurality of second positioning holes 211 are provided on the machine table 210, and the plurality of second positioning holes 211 are arranged in a matrix, so that the position of the positioning tooling 240 can be adjusted according to the actual working conditions. At the same time, when the specification of the positioning tooling 240 changes due to adapting to different specifications of the stator housing, the machine table 210 can still be suitable for positioning the replaced positioning tooling 240.
[0049] In addition, it is worth noting that in this embodiment, the axial flux motor is in the form of S-R-S (stator-rotor-stator). All the fastening holes 130 of one stator housing correspond to all the fastening holes 130 of the other stator housing one by one, and the two stator housings are fixedly connected by a pin passing through the corresponding two fastening holes 130.
[0050] Based on the above, the positioning tooling 240 positions the stator housing through the fastening holes 130. Specifically, in this embodiment, a positioning structure is provided on the positioning tooling 240. The positioning structure includes two third positioning holes 242, and the two third positioning holes 242 are directly opposite to two fastening holes 130 on the stator housing. The stator housing is positioned on the positioning tooling 240 through a second pin (not shown in the figure) passing through the fastening hole 130 and the third positioning hole 242, so as to position the stator housing.
[0051] It can be understood that in other alternative embodiments, the positioning structure may also include three or more third positioning holes 242, and this embodiment does not make specific limitations on this.
[0052] Further, the positioning tooling 240 includes more than two positioning structures. For any one of the positioning structures, the third positioning holes 242 included therein define a placement area suitable for placing the stator housing. The areas of the placement areas defined by any two positioning structures are different, so that the same positioning tooling 240 can be suitable for placing and positioning more than two specifications of stator housings. That is, in this embodiment, it is not necessary to correspondingly set a positioning tooling 240 for each specification of the stator housing, thereby further saving production costs.
[0053] Exemplarily, in this embodiment, the positioning tooling 240 includes five positioning structures. All the positioning structures include two third positioning holes 242. The two third positioning holes 242 of one of the positioning structures are diagonally arranged on the positioning tooling 240. For the other positioning structures, the two third positioning holes 242 are both spaced along the width direction of the positioning tooling 240. Among all the positioning structures, for any two positioning structures, the distance between the two third positioning holes 242 of one of the positioning structures along the width direction of the positioning tooling 240 is different from the distance between the two third positioning holes 242 of the other positioning structure along the width direction of the positioning tooling 240.
[0054] In addition, in this embodiment, the driving mechanism 230 includes a first driving module 231 and a second driving module 232. Among them, the first driving module 231 is configured to drive the laser head 220 to move along the first horizontal direction, and the second driving module 232 is configured to drive the laser head 220 to move along a second horizontal direction perpendicular to the first horizontal direction, so that the laser head 220 moves in the horizontal plane, and further enables the laser head 220 to move along a preset trajectory.
[0055] In addition to the first driving module 231 and the second driving module 232, the driving mechanism 230 further includes a third driving module 233. The third driving module 233 is configured to drive the laser head 220 to lift in the vertical direction to adjust the distance between the laser head 220 and the stator housing, so as to ensure that the laser beam emitted by the laser head 220 can accurately weld the position to be welded on the stator housing, so as to avoid defects such as burn-through or weld bead in the weld seam.
[0056] It should be noted that, in this embodiment, the first driving module 231, the second driving module 232 and the third driving module 233 are all KK modules. Of course, in other optional embodiments, the first driving module 231, the second driving module 232 and the third driving module 233 can also be other linear driving structures, and this embodiment does not make specific limitations on this.
[0057] Obviously, the above embodiments of the present utility model are merely examples for clearly illustrating the present utility model, rather than limitations on the implementation manners of the present utility model. For those of ordinary skill in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present utility model. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present utility model shall be included within the protection scope of the claims of the present utility model.
Claims
1. Welding equipment for the stator housing of an axial flux motor, the stator housing comprising a housing (110) and an end cover (120) sealed at the end of the housing (110), characterized in that, The welding equipment for the stator housing of the axial flux motor includes: A machine table (210) configured to place the stator housing pre-assembled by the housing (110) and the end cover (120); A laser head (220) configured to emit a laser beam to the position to be welded on the stator housing; and A driving mechanism (230) configured to drive the laser head (220) to move along a preset trajectory.
2. The welding device for the stator housing of the axial flux motor according to claim 1, characterized in that, The welding equipment for the stator housing of the axial flux motor further includes a positioning tooling (240). The positioning tooling (240) is configured to position the stator housing, and the machine table (210) is configured to place the positioning tooling (240).
3. The welding equipment for the stator housing of the axial flux motor according to claim 2, characterized in that, At least two first positioning holes (241) are provided on the positioning tooling (240). For any one of the first positioning holes (241), a second positioning hole (211) is provided on the machine table (210). The positioning tooling (240) is positioned on the machine table (210) by a first pin inserted through the first positioning hole (241) and the second positioning hole (211).
4. The welding device for the stator housing of the axial flux motor according to claim 3, characterized in that, A plurality of the second positioning holes (211) are provided on the machine table (210), and the plurality of second positioning holes (211) are arranged in a matrix.
5. The welding device for the stator housing of the axial flux motor according to claim 2, characterized in that, A positioning structure is provided on the positioning tooling (240). The positioning structure includes at least two third positioning holes (242). At least two of the third positioning holes (242) are in one-to-one correspondence with at least two fastening holes (130) on the stator housing. The stator housing is positioned on the positioning tooling (240) by a second pin passing through the fastening hole (130) and the third positioning hole (242).
6. The welding device for the stator housing of the axial flux motor according to claim 5, characterized in that, The positioning tooling (240) includes more than two of the positioning structures. For any one of the positioning structures, at least two of the third positioning holes (242) define a placement area suitable for placing the stator housing, and the areas of the placement areas defined by any two of the positioning structures are different.
7. The welding device for the stator housing of the axial flux motor according to claim 1, wherein Both the housing (110) and the end cover (120) are made of aluminum.
8. The welding device for the stator housing of the axial flux motor according to claim 1, characterized in that, The driving mechanism (230) includes a first driving module (231) and a second driving module (232). The first driving module (231) is configured to drive the laser head (220) to move in a first horizontal direction, and the second driving module (232) is configured to drive the laser head (220) to move in a second horizontal direction perpendicular to the first horizontal direction.
9. The welding device for the stator housing of the axial flux motor according to claim 8, characterized in that, The driving mechanism (230) further includes a third driving module (233) configured to drive the laser head (220) to lift and lower in the vertical direction.
10. The welding equipment for the stator housing of the axial flux motor according to claim 1, characterized in that, The welding equipment for the stator housing of the axial flux motor further includes a machine housing (250). The machine housing (250) covers the upper part of the machine table (210), and an inert gas is passed through the inside of the machine housing (250).