Stator assembly of outer rotor hub motor with cooling mechanism

Abstract

The invention relates to a stator assembly of an outer rotor hub motor with a cooling mechanism. The stator assembly comprises a stator bracket, a stator, a motor shaft and a cooling pipeline, the stator bracket comprises a shaft hole, a connecting part and a stator mounting part; the stator mounting part is arranged on the circumferential surface with the shaft hole as the center, and the stator is arranged on the stator mounting part; the connecting part is provided with a binding post; the stator outgoing line is connected with the binding post; the cooling pipeline is arranged on the stator mounting part and distributed in the circumferential surface where the stator mounting part is located, the cooling pipeline is provided with a main water inlet and a main water outlet, and the main water inlet and the main water outlet are formed in the same side of the stator support. By increasing the area of the stator mounting part and arranging the cooling pipeline on the stator, the heat dissipation problem of the stator is solved, and the binding post is used for replacing a wire outlet hole of the motor shaft, so that the problem of inconvenient connection of a stator outgoing wire in the prior art is solved, and the potential safety hazard that the strength of the motor shaft is weakened and the motor shaft is easy to break is eliminated.

Description

Technical Field

[0001] The present invention relates to the technical field of in-wheel motors, and specifically to a stator assembly of an outer-rotor in-wheel motor with a cooling mechanism. Background Art

[0002] For existing outer-rotor in-wheel motors, as Figure 1 shown, the rotor 6 is arranged on the rim, the stator 2 is installed on the stator bracket 1, and the stator bracket 1 is fixedly arranged on the motor shaft 3. During the operation of the in-wheel motor, a large amount of heat is generated when current passes through the stator 2 coil. A part of the heat is transferred from the stator 2 to the stator bracket 1, and then the stator bracket 1 transfers it to the motor shaft 3 to dissipate the heat into the air of the motor housing; another part of the heat uses the air in the motor cavity as a heat conduction medium, and the cavity air then transfers the heat to the left and right end covers, and the left and right end covers absorb the heat in the cavity and dissipate it to the outside air. Due to the low thermal conductivity of air and the small contact area between the stator bracket 1 and the motor shaft 3 in the existing in-wheel motor, the overall heat dissipation effect of the motor is poor, resulting in the in-wheel motor being unable to continuously work at high power for a long time, reducing the riding experience. At the same time, the high temperature of the motor coil will also increase the coil resistance, reduce the motor efficiency, and shorten the cruising range of the whole vehicle.

[0003] Chinese Utility Model Patent CN 215871090 U discloses a cooling structure for an in-wheel motor. A cooling pipe is provided inside the motor body, and both ends of the cooling pipe extend outside the motor body and are respectively connected with an external air filter and a vacuum pump. The cooling pipe is arranged in a ring along the contour of the stator inside the motor body; or is spirally distributed on both sides of the stator, and the two groups of spiral cooling pipes are located in two parallel planes.

[0004] This technical solution provides a solution for motor heat dissipation. However, this solution has a too complex structure. It is really difficult to wind the cooling pipes on two parallel planes on both sides of the stator, the operation is troublesome, it is not easy to assemble, the lead-out part of the cooling pipe is mixed with the stator lead-out wire. Once a motor failure occurs, it is not easy to troubleshoot, and the disassembly and assembly are inconvenient. Generally, the whole motor is scrapped, and the use cost is too high.

[0005] In addition, the motor of this utility model has the same defect as the Figure 1 shown motor, that is, an outlet hole 31 for the stator lead-out wire 21 is provided in the motor shaft 3 to lead the stator lead-out wire 21 from the inside of the motor to the outside of the motor. A part of the motor shaft 3 must be hollow, which damages the strength of the motor shaft 3 and has a potential safety hazard of fracture; and after the stator 2 is damaged, it cannot be replaced, and only the whole motor can be scrapped, which not only causes waste but also increases the user's use cost. Summary of the Invention

[0006] The object of the present invention is to provide a stator assembly of an outer-rotor hub motor with a cooling mechanism, which not only solves the problem of stator heat dissipation but also eliminates the potential safety hazard that the strength of the motor shaft is weakened and prone to breakage due to the lead-out wire of the motor shaft in the prior art.

[0007] To achieve the above object, the technical solution of the present invention is as follows: A stator assembly of an outer-rotor hub motor with a cooling mechanism, which comprises a stator bracket, a stator, a motor shaft and a cooling pipeline; The stator bracket is sequentially provided with a shaft hole, a connecting part and a stator mounting part from the center outwards; the stator mounting part is arranged on the circumferential surface centered on the shaft hole, and the connecting part is arranged in the space between the stator mounting part and the shaft hole; the motor shaft is arranged in the shaft hole, and the stator is arranged on the stator mounting part; the connecting part is provided with a terminal; the stator lead wire is connected to the terminal; The cooling pipeline is arranged in the stator mounting part, and the cooling pipeline is distributed in the circumferential surface where the stator mounting part is located. The cooling pipeline has a total water inlet and a total water outlet, and the total water inlet and the total water outlet are arranged on the same side of the stator bracket.

[0008] Three stator lead wires are grouped together, and one group or more than one group of stator lead wires are provided; three terminals of the connecting part are grouped together, and one group or more than one group of terminals corresponding to the stator lead wires are provided on the connecting part.

[0009] The cooling pipeline starts from the total water inlet in the stator mounting part and extends to the total water outlet in a serpentine manner through the left and right ends of the stator mounting part.

[0010] The cooling pipeline is composed of pipeline units that are interconnected between the total water inlet and the total water outlet, and the pipeline unit is a pipeline that penetrates the left and right ends of the stator mounting part.

[0011] Each pipeline unit includes a sub-water inlet and a sub-water outlet; the sub-water outlet of any one pipeline unit and the sub-water inlet of the previous pipeline unit connected thereto are respectively arranged at both ends of the stator mounting part and penetrate each other; the sub-water inlet of any one pipeline unit and the sub-water outlet of the next pipeline unit connected thereto are respectively arranged at both ends of the stator mounting part and penetrate each other.

[0012] A sink is arranged between the sub-water inlet and the sub-water outlet of each pipeline unit and is recessed from the end face of the stator mounting part.

[0013] Water channel covers covering the sink are arranged on both end faces of the stator mounting part.

[0014] The stator is sleeved outside the stator mounting part and is fixed by a stator cover.

[0015] The width of the stator mounting part is greater than the width of the lead wire connection part.

[0016] The width of the stator is adapted to the width of the stator mounting part.

[0017] The motor shaft is integrally formed with the stator bracket.

[0018] The advantages of the present invention are as follows: 1. The connection part of the stator bracket is provided with a terminal post, and the stator lead-out wire is led out through the terminal post, eliminating the need to set wire holes for leading out the lead-out wire on the motor shaft, greatly increasing the strength of the motor shaft; 2. The setting of the terminal post in the connection part enables the motor shaft and the stator bracket to be integrally formed, further increasing the strength of the stator assembly; 3. The setting of the terminal post in the connection part enables the stator of the motor to be disassembled and replaced. When the stator of the motor is damaged, the motor does not need to be scrapped as a whole, but the user cost can be reduced by replacing the stator; 4. The setting of the terminal post makes it possible to adjust the motor power. The terminal post can be set according to the number of groups of stator lead-out wires, and the motor power can be adjusted by connecting different numbers of groups of stator lead-out wires. That is, by connecting more groups of stator lead-out wires, the motor power can be increased; or by reducing the number of connected stator lead-out wire groups, the motor power can be reduced; or when one group of stator lead-out wires is damaged, it does not affect the normal operation of the motor; 5. The width of the stator mounting part is greater than that of the connection part, and the stator width is adapted to the stator mounting, increasing the contact area between the stator and the stator bracket and improving the heat dissipation efficiency of the stator bracket; 6. The cooling pipe is a pipe penetrating through the stator mounting part. As long as the stator mounting part is not damaged, the cooling pipe will not be damaged. Moreover, the heat generated by the stator can be taken away by the cooling water more directly and quickly, with extremely high heat dissipation effect. Description of the Drawings

[0019] Figure 1 It is a cross-sectional view of the structure of an existing outer-rotor hub motor.

[0020] Figure 2 It is a cross-sectional view of an outer-rotor hub motor containing the present invention.

[0021] Figure 3 It is an exploded view of the structure of the present invention.

[0022] Figure 4 It is a schematic diagram of the connection between the stator lead-out wire and the terminal post of the present invention.

[0023] Figure 5 It is a schematic diagram of the left end face structure of the stator bracket of the present invention.

[0024] Figure 6 It is a schematic diagram of the right end face of the stator bracket of the present invention.

[0025] Figure 7 It is a schematic diagram of the planar development of the cooling pipe of the present invention.

[0026] In the figure: 1 - stator bracket; 11 - stator mounting part; 12 - connecting part; 13 - shaft hole; 14 - terminal; 2 - stator; 21 - stator lead wire; 22 - stator cover; 3 - motor shaft; 31 - wire outlet hole; 4 - cooling pipe; 41 - total water inlet; 411 - sub - water inlet; 42 - total water outlet; 421 - sub - water outlet; 43 - pipe unit; 44 - sunk groove; 5 - waterway cover; 6 - rotor. Detailed implementation mode

[0027] The following further describes the present invention with reference to the attached drawings. The attached drawings are only for illustrative purposes and should not be construed as a limitation to this patent.

[0028] For a more concise description of this embodiment, some components that are well - known to those skilled in the art but are not relevant to the main content of this creation will be omitted in the drawings or description. Additionally, for the convenience of expression, some components in the drawings will be omitted, enlarged, or reduced, but this does not represent the size or all structures of the actual product.

[0029] The stator assembly of an outer - rotor hub motor with a cooling mechanism according to the present invention, as Figure 2-7 shown, includes a stator bracket 1, a stator 2, and a motor shaft 3; as Figure 4 shown, the stator bracket 1 is sequentially provided with a shaft hole 13, a connecting part 12, and a stator mounting part 11 from the center outwards; the stator mounting part 11 is arranged on the circumferential surface centered on the shaft hole 13, and the connecting part 12 is arranged in the space between the stator mounting part 11 and the shaft hole 13.

[0030] As Figure 3 shown, the motor shaft 3 is arranged in the shaft hole 13, and the stator 2 is arranged on the stator mounting part 11; the stator 2 is sleeved outside the stator mounting part 11 and fixed by the stator cover 22. Preferably, as Figure 2 shown, the cross - section of the stator bracket 1 is in the shape of being wider outside and narrower inside, the width of the stator mounting part 11 is greater than that of the connecting part 12, and the width of the stator 2 is adapted to the width of the stator mounting part 11.

[0031] In the present invention, the stator mounting part 11 is relatively wide, and the stator 2 is sleeved on the outer surface of the stator mounting part 11 and fixed by the stator cover 22. In this way, the contact area between the stator 2 and the stator mounting part 11 is very large, and the heat dissipation efficiency through the stator bracket 1 is greatly improved.

[0032] As Figure 3-6 shown, the connecting part 12 is provided with a terminal mounting hole 141, the terminal 14 is arranged on the connecting part 12 through the terminal mounting hole 141, and the stator lead wire 21 is connected to the terminal 14. The setting of the terminal 14 abandons Figure 1In the existing design shown, there is a defect that the stator lead wire 21 is led out through the wire outlet hole 31 dug on the motor shaft 3. The motor shaft 3 no longer needs to be provided with the wire outlet hole 31 and is no longer hollow, greatly enhancing the strength of the motor shaft 3. In addition, the setting of the terminal 14 makes the installation of the motor stator 2 more convenient, realizing that the stator 2 can be replaced after being damaged. Once the stator 2 of the motor is damaged, it will no longer cause the entire motor to be scrapped. As long as the stator 2 is replaced, the motor can be repaired, greatly reducing the user's usage cost and also greatly improving the utilization rate and service life of the motor.

[0033] The motor shaft 3 and the stator bracket 1 can also be integrally formed, so that the strength of the entire stator assembly is also greatly increased.

[0034] Since the stator lead wire 21 is three-phase, the stator lead wire 21 is three in a group. Correspondingly, the terminals 14 of the connecting portion 12 are also three in a group. As the radius of the wheel rim increases, more windings can be set for the stator 2, and the number of groups of the stator lead wire 21 will also increase accordingly. The power of the motor depends on the number of windings of the stator 2 participating in the work, that is, on the number of groups of the stator lead wire 21 connected to the battery. That is, the more groups of the stator lead wire 21 are connected, the greater the power of the motor.

[0035] Furthermore, by using the stator assembly of the present invention, the adjustable power of the motor can be realized. As Figure 4 shown, multiple groups of terminals 14 can be provided on the connecting portion 12. In this way, if the number of groups of the stator lead wire 21 connected to the battery increases, the power of the motor can be increased. Therefore, when the stator lead wire 21 is provided with one group or more than one group, correspondingly, the terminals 14 of the connecting portion 12 are also provided with one group or more than one group. When it is necessary to increase the power of the motor, it can be realized by connecting multiple groups of the stator lead wire 21; when it is necessary to reduce the power of the motor, it can be realized by reducing the number of groups of the stator lead wire 21 connected.

[0036] Moreover, the motor using the stator assembly of the present invention has high safety. When one group of the multiple groups of the stator lead wire 21 connected is damaged, only the power of the motor will be reduced, and the motor will not stop. In this way, during the driving of the electric vehicle, the motor will not suddenly stop due to the partial damage of the stator 2, causing a safety accident.

[0037] As Figure 5-7 shown, a cooling pipe 4 for cooling water is provided in the stator bracket 1. The cooling pipe 4 is provided in the stator mounting portion 11, so that the cooling water can directly take away the heat generated by the stator 2.

[0038] The cooling pipe 4 is provided with a total water inlet 41 and a total water outlet 42. The total water inlet 41 and the total water outlet 42 are arranged on the same side of the stator bracket 1. Preferably, the total water inlet 41 and the total water outlet 42 are arranged on the same side of the connecting portion 12. The total water inlet 41 and the total water outlet 42 are connected to the external water tank of the motor. The external water tank of the motor and the cooling pipe 4 form a circulating cooling mechanism, and the heat generated by the stator 2 is taken away through the circulating cooling mechanism of the cooling pipe 4 and the water tank.

[0039] As Figure 5-7 shown, the cooling pipe 4 is composed of pipe units 43 that are interconnected between the total water inlet 41 and the total water outlet 42; the pipe unit 43 is a pipe that penetrates the left and right ends of the stator mounting portion 11.

[0040] As Figure 7 shown in the planar development view of the cooling pipe 4 within the stator mounting portion 11, the cooling pipe 4 starts from the total water inlet 41 within the stator mounting portion 11 and extends to the total water outlet 42 at the end in a serpentine manner through the left and right ends of the stator mounting portion 11. That is, taking the left and right ends of the stator mounting portion 11 as turning points, starting from the total water inlet 41, it is arranged in a serpentine pattern from left to right to left to right within the stator mounting portion 11, and finally reaches the total water outlet 42, forming a complete serpentine arranged cooling pipe 4 on the circumferential surface of the stator mounting portion 11.

[0041] As Figure 5 、 Figure 6 shown, each pipe unit 43 includes a sub-water inlet 411 and a sub-water outlet 421 and the interconnected pipes; the sub-water outlet 421 of any one pipe unit 43 and the sub-water inlet 411 of the previous interconnected pipe unit 43 are respectively arranged at both ends of the stator bracket 1 and are interconnected; similarly, the sub-water inlet 411 of any one pipe unit 43 and the sub-water outlet 421 of the next interconnected pipe unit 43 are respectively arranged at both ends of the stator bracket 1 and are interconnected.

[0042] Furthermore, a sunk groove 44 lower than the end face of the stator mounting portion 11 is provided between the sub-water inlet 411 and the sub-water outlet 421 of each pipe unit 43. In order to form a closed cooling pipe 4, water channel covers 5 covering the sunk groove 44 are provided on both end faces of the stator mounting portion 11. In this way, the external water tank of the motor is connected to the total water inlet 41 and the total water outlet 42, and together with the cooling pipe 4, a closed motor water cooling system is formed.

[0043] The above is only the preferred embodiment of the present invention and is not used to limit the scope of implementation of the present invention. That is, all equivalent changes and modifications made to the content within the scope of the patent application of the present invention should fall within the technical scope of the present invention.

Claims

1. A stator assembly of an outer rotor hub motor with a cooling mechanism, comprising a stator bracket (1), a stator (2), a motor shaft (3) and a cooling pipe (4); Features: The stator bracket (1) is provided with an axial hole (13), a connecting portion (12) and a stator mounting portion (11) in sequence from the center outward; the stator mounting portion (11) is arranged on a circumferential surface centered on the axial hole (13), and the connecting portion (12) is arranged in a space between the stator mounting portion (11) and the axial hole (13); the motor shaft (3) is arranged in the axial hole (13), and the stator (2) is arranged on the stator mounting portion (11); the connecting portion (12) is provided with a terminal (14); and the stator lead wire (21) is connected to the terminal (14); The cooling pipeline (4) is arranged on the stator mounting portion (11), the cooling pipeline (4) is distributed within the circumferential surface where the stator mounting portion (11) is located, the cooling pipeline (4) has a total water inlet (41) and a total water outlet (42), and the total water inlet (41) and the total water outlet (42) are arranged on the same side of the stator bracket (1).

2. The stator assembly of the outer rotor hub motor with a cooling mechanism according to claim 1, characterized in that: Three stator lead wires (21) form a group, and one or more stator lead wires (21) are provided. Three terminal posts (14) of the connection part (12) form a group, and the connection part (12) is provided with one or more terminal posts (14) in accordance with the stator lead wires (21).

3. The stator assembly of the outer rotor hub motor with a cooling mechanism according to claim 1, characterized in that: The cooling pipe (4) starts at the main water inlet (41) in the stator mounting portion (11) and extends in a serpentine manner through the left and right ends of the stator mounting portion (11) to the main water outlet (42) as the end.

4. The stator assembly of the outer rotor hub motor with a cooling mechanism according to claim 1, characterized in that: The cooling pipeline (4) is composed of a pipeline unit (43) that is interconnected from a main water inlet (41) to a main water outlet (42), and the pipeline unit (43) is a pipeline that passes through the left and right ends of the stator mounting part (11); Each pipeline unit (43) comprises a sub-water inlet (411) and a sub-water outlet (421); the sub-water outlet (421) of any pipeline unit (43) and the sub-water inlet (411) of the previous pipeline unit (43) connected thereto are respectively arranged at two ends of the stator mounting part (11) and are interconnected; the sub-water inlet (411) of any pipeline unit (43) and the sub-water outlet (421) of the next pipeline unit (43) connected thereto are respectively arranged at two ends of the stator mounting part (11) and are interconnected.

5. The stator assembly of the outer rotor hub motor with a cooling mechanism according to claim 4, characterized in that: A recessed groove (44) recessed into the end surface of the stator mounting portion (11) is provided between the sub-water inlet (411) and the sub-water outlet (421) of each pipeline unit (43).

6. The stator assembly of the outer rotor hub motor with a cooling mechanism according to claim 5, characterized in that: Waterway cover plates (5) covering the sink grooves (44) are provided on both end surfaces of the stator mounting portion (11).

7. The stator assembly of the outer rotor hub motor with a cooling mechanism according to claim 1, characterized in that: The stator (2) is sleeved on the outside of the stator mounting portion (11) and is fixed by a stator cover (22).

8. The stator assembly of the outer rotor hub motor with a cooling mechanism according to claim 1, characterized in that: The width of the stator mounting portion (11) is greater than the width of the lead wire connection portion (12).

9. The stator assembly of the outer rotor hub motor with a cooling mechanism according to claim 8, characterized in that: The width of the stator (2) is adapted to the width of the stator mounting portion (11).

10. The stator bracket of the hub motor with a cooling structure according to claim 1, characterized in that: The motor shaft (3) and the stator bracket (1) are formed integrally.

Images