Stator assembly of outer rotor hub motor

Abstract

The utility model relates to a stator assembly of an outer rotor hub motor. The stator assembly comprises a stator support, a stator and a motor shaft. The stator bracket is sequentially provided with a shaft hole, a lead connecting part and a stator mounting part from center to outside; the stator mounting part is arranged on a circumferential surface taking the shaft hole as the center, and a lead connecting part is arranged in a space between the stator mounting part and the shaft hole; the motor shaft is arranged in the shaft hole; the stator is arranged on the stator mounting part; the lead connecting part is provided with a binding post; and the stator outgoing line is connected with the binding post. According to the utility model, through increasing the area of the stator installation part and arranging the binding post to replace a wire hole of the motor shaft, the problems of inconvenient connection of a stator outgoing line, weakening of the strength of the motor shaft and low heat dissipation efficiency in the prior art are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of in-wheel motors, in particular to a stator assembly of an outer-rotor in-wheel motor. Background Art

[0002] An in-wheel motor is a driving component used on an electric vehicle to drive the electric vehicle to travel. The existing electric vehicle in-wheel motors include outer-rotor motors and inner-rotor motors. For the existing outer-rotor in-wheel motor, the stator is installed on the stator bracket, and the stator bracket is designed with a relatively small inner hole to be fixed on the motor shaft. The left and right end covers are connected to the rim to form a rotor assembly and are installed on the motor shaft. During the operation of the electric vehicle in-wheel motor, current passing through the coils on the stator will generate heat, and the heat generated by the coils on the stator is transferred out through two ways at the same time. One is to transfer the heat from the stator to the stator bracket, and then the stator bracket transfers the heat to the motor shaft, and the motor shaft dissipates the heat into the air in the motor housing. The other is to use the air in the motor cavity as a heat conduction medium, and the air in the cavity 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 into the external air. Due to the low thermal conductivity of air and the small contact area between the stator bracket and the motor shaft, the overall heat dissipation effect of the existing in-wheel motor is poor, resulting in the inability of the in-wheel motor to continuously work at high power for a long time, reducing the riding experience. At the same time, the high temperature of the motor coils will also increase the coil resistance, reduce the motor efficiency, and shorten the cruising range of the whole vehicle.

[0003] In addition, as Figure 1 shown, for the existing motor, the rotor 4 is arranged on the rim, the stator bracket 1 is fixedly arranged on the motor shaft 3, the stator 2 is installed on the stator bracket 1, and an outlet hole 31 for the stator lead-out wire 21 is arranged 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. Moreover, with the existing motor arrangement, 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 usage cost. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a stator assembly of an outer-rotor in-wheel motor, which solves the problems of inconvenient connection of the stator lead-out wire, weakened strength of the motor shaft, and low heat dissipation efficiency in the prior art.

[0005] To achieve the above purpose, the technical solution of the utility model is as follows:

[0006] A stator assembly of an outer-rotor hub motor, which comprises a stator bracket, a stator and a motor shaft; the stator bracket is successively provided with a shaft hole, a lead connection 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 lead connection 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 lead connection part is provided with connection terminals; the stator lead-out wire is connected to the connection terminals.

[0007] The stator is sleeved on the outside of the stator mounting part and fixed by a stator cover.

[0008] Three stator lead-out wires are in a group, and one group or more than one group of stator lead-out wires are provided; three connection terminals of the lead connection part are in a group, and one group or more than one group of connection terminals are correspondingly provided in the lead connection part to match the stator lead-out wires.

[0009] The motor shaft and the stator bracket are integrally formed.

[0010] The width of the stator mounting part is greater than the width of the lead connection part.

[0011] The width of the stator is adapted to the width of the stator mounting part.

[0012] The stator bracket is further provided with a cooling water channel for cooling water, and the stator bracket is provided with a total water inlet and a total water outlet for the cooling water channel.

[0013] The cooling water channel is arranged in the stator mounting part.

[0014] The advantages of the present utility model are as follows: 1. The lead connection part of the stator bracket is provided with connection terminals, and the stator lead-out wire is led out through the connection terminals, so that there is no need to set a wire hole for leading out the lead-out wire on the motor shaft, greatly increasing the strength of the motor shaft; 2. The setting of the connection terminals of the lead 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 connection terminals of the lead 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 connection terminals makes it possible to adjust the power of the motor. The connection terminals can be correspondingly set according to the number of groups of stator lead-out wires, and the power of the motor can be adjusted by connecting the number of groups of stator lead-out wires. That is, by connecting multiple groups of stator lead-out wires, the power of the motor is increased; or by reducing the number of groups of connected stator lead-out wires, the power of the motor is 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 lead connection part, and the width of the stator 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. A cooling water channel is arranged in the stator bracket, further increasing the way of heat dissipation of the motor. Description of the Drawings

[0015] Figure 1 It is a sectional view of the structure of an existing outer-rotor hub motor.

[0016] Figure 2 It is a sectional view of an outer-rotor hub motor containing the present utility model.

[0017] Figure 3 It is an exploded view of the structure of the present utility model.

[0018] Figure 4 It is a schematic diagram of the stator bracket structure of the present utility model.

[0019] Figure 5 It is a schematic diagram of the connection between the stator lead wire and the terminal of the present utility model.

[0020] Figure 6 It is a schematic diagram of the stator bracket and the cooling water channel of the present utility model.

[0021] In the figure: 1 - stator bracket; 11 - stator mounting part; 12 - lead connection part; 13 - shaft hole; 14 - terminal; 2 - stator; 21 - stator lead wire; 22 - stator cover; 3 - motor shaft; 31 - wire outlet hole; 4 - rotor; 5 - cooling water channel; 51 - total water inlet; 52 - total water outlet. Specific embodiments

[0022] The following further describes the present utility model with reference to the accompanying drawings. The accompanying drawings are only for illustrative purposes and should not be construed as a limitation of this patent.

[0023] For the sake of more concise description of this embodiment, some components that are well-known to those skilled in the art but not relevant to the main content of this creation will be omitted in the drawings or description. In addition, 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.

[0024] The stator assembly of an outer-rotor hub motor of the present utility model, as Figure 2-6 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 lead connection 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 lead connection part 12 is arranged in the space between the stator mounting part 11 and the shaft hole 13.

[0025] 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 is fixed by the stator cover 22. Preferably, as Figure 2As shown, the cross-section of the stator support 1 is wider on the outside and narrower on the inside. The width of the stator mounting portion 11 is greater than that of the lead connection portion 12, and the width of the stator 2 is adapted to the width of the stator mounting portion 11.

[0026] In the present utility model, the stator mounting portion 11 is relatively wide. The stator 2 is sleeved on the outer surface of the stator mounting portion 11 and fixed by the stator cover 22. In this way, the contact area between the stator 2 and the stator mounting portion 11 is very large, and the heat dissipation efficiency through the stator support 1 is greatly improved.

[0027] As Figure 3 、 4 shown, the lead connection portion 12 is provided with a terminal 14; the stator lead 21 is connected to the terminal 14. The setting of the terminal 14 abandons the defect that the stator lead 21 is led out through the wire outlet hole 31 dug on the motor shaft 3 in the existing design as Figure 1 shown. The motor shaft 3 no longer needs to be provided with a wire outlet hole 31 and is not 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, and moreover, it realizes 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 scrapping of the entire motor. 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 usage rate and service life of the motor.

[0028] The motor shaft 3 and the stator support 1 can also be integrally formed, so that the strength of the entire stator assembly is also greatly increased.

[0029] Since the stator lead 21 is three-phase, the stator lead 21 is three in a group. Correspondingly, the terminals 14 of the lead connection 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 leads 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, it depends on the number of groups of the stator leads 21 connected to the battery. That is to say, the more groups of the stator leads 21 are connected, the greater the power of the motor.

[0030] Furthermore, by using the stator assembly of the present utility model, the adjustable power of the motor can be realized. As Figure 5 shown, multiple groups of terminals 14 can be provided on the lead connection portion 12. In this way, if the number of groups of the stator leads 21 connected to the battery increases, the power of the motor can be increased. Therefore, when the stator leads 21 are provided with one group or more than one group, correspondingly, the terminals 14 of the lead connection 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 stator leads 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 leads 21 connected.

[0031] Moreover, the motor using the stator assembly of the present utility model has high safety. When one of the multiple sets of stator lead wires 21 that are connected is damaged, only the power of the motor will be reduced, rather than causing the motor to stop. In this way, during the running of the electric vehicle, the motor will not suddenly stop due to local damage of the stator 2, thus avoiding safety accidents.

[0032] As Figure 6 shown, the present utility model can be used for a water-cooled motor. A cooling water channel 5 for cooling water is provided in the stator bracket 1. The cooling water channel 5 can be arranged in the stator mounting portion 11, so that the cooling water can directly take away the heat generated by the stator 2. The stator bracket 1 is provided with a total water inlet 51 and a total water outlet 52 of the cooling water channel 5. The total water inlet 51 and the total water outlet 52 are connected to a water tank outside the motor. In this way, the water tank and the cooling water channel 5 form a water cooling mechanism for motor heat dissipation.

[0033] In summary, the above are only the preferred embodiments of the present utility model, and are not used to limit the scope of implementation of the present utility model. That is, all equivalent changes and modifications made to the content within the scope of the patent application of the present utility model shall fall within the technical scope of the present utility model.

Claims

1. A stator assembly of an outer rotor hub motor, comprising a stator bracket (1), a stator (2) and a motor shaft (3); characterized in that: The stator bracket (1) is provided with an axial hole (13), a lead connection 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 lead connection 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 lead connection portion (12) is provided with a terminal (14); and the stator lead wire (21) is connected to the terminal (14).

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

3. The stator assembly of the outer rotor hub motor 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 lead wire connection part (12) form a group, and one or more terminal posts (14) are provided in the lead wire connection part (12) in accordance with the stator lead wires (21).

4. The stator assembly of the outer rotor hub motor according to claim 1, characterized in that: The motor shaft (3) and the stator bracket (1) are formed integrally.

5. The stator assembly of the outer rotor hub motor 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).

6. The stator assembly of the outer rotor hub motor according to claim 5, characterized in that: The width of the stator (2) is adapted to the width of the stator mounting portion (11).

7. The stator assembly of the outer rotor hub motor according to claim 1, characterized in that: The stator bracket (1) is also provided with a cooling water channel (5) for cooling water, and the stator bracket (1) is provided with a total water inlet (51) and a total water outlet (52) of the cooling water channel (5).

8. The stator assembly of the outer rotor hub motor according to claim 7, characterized in that: The cooling water channel (5) is arranged on the stator mounting portion (11).

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