Mounting method of motor stator

Abstract

The invention relates to an installation method of a motor stator. The installation method comprises the following steps: cooling the motor stator to a first temperature C1; assembling the cooled motor stator into a transmission shell; and pressure maintaining pressure is applied to the motor stator at the axial end of the motor stator, and the pressure maintaining duration is the first duration T1. The motor stator is cooled, so that the temperature difference between the motor stator and the transmission shell is increased, interference fit between the motor stator and the transmission shell is changed into clearance fit, meanwhile, the overall size of the motor stator can be reduced by cooling the motor stator, the clearance between the motor stator and the transmission shell is increased, and assembly is easier. Besides, after the motor stator is assembled, the pressure of the motor stator is maintained so as to reduce the probability of occurrence of depth offset of the motor stator in the transmission shell caused by desynchrony of deformation of the transmission shell and the motor stator when the motor stator and the transmission shell are cooled, so that the assembly precision of the motor stator and the transmission shell is improved, and the production efficiency is improved. The noise problem of the transmission is improved.

Description

Technical Field

[0001] The present disclosure relates to the technical field of motor installation, and in particular, to a method for installing a motor stator. Background Art

[0002] In the traditional installation method of the motor stator, the transmission housing is usually heated to increase the volume of the heated transmission housing and increase the gap between the mating surfaces of the two, so that the motor stator can be placed in the transmission housing for assembly. At present, this assembly method still has great difficulties in the assembly process, and cannot ensure the accurate installation of the electronic stator, which is easy to cause transmission noise problems. Summary of the invention

[0003] The purpose of the present disclosure is to provide a method for installing a motor stator to reduce the difficulty of assembly and solve the problem of transmission noise.

[0004] The present disclosure provides a method for installing a motor stator, the method comprising: Cool the motor stator to a first temperature C 1 ; Assembling the cooled motor stator into the transmission housing; and A holding pressure is applied to the motor stator at the axial end of the motor stator, wherein the holding pressure duration is a first duration T 1 .

[0005] Optionally, in the step of cooling the motor stator to a first temperature C 1 After the step of assembling the cooled motor stator into the transmission housing, the installation method further comprises: insulating the motor stator, wherein the insulation time is a second time length T 2 .

[0006] Optionally, the first temperature C 1 -30°C to -40°C; and / or The second duration T 2 For 15-20 minutes.

[0007] Optionally, before the step of assembling the cooled motor stator into the transmission housing, the installation method further comprises: heating the transmission housing to a second temperature C 2 And keep warm, wherein the heat preservation time is the third time T 3 .

[0008] Optionally, the second temperature C 2 With the first temperature C 1 The temperature difference is not less than 200°C; and / or The third duration T 3For 15-20 minutes.

[0009] Optionally, the step of assembling the cooled motor stator into the transmission housing comprises: Connect the handling tooling to the motor stator; Putting the motor stator into the transmission housing by means of the handling tool until the motor stator contacts the bottom of the transmission housing; Rotate the motor stator to match the marking on the motor stator with the marking on the transmission case.

[0010] Optionally, in the step of assembling the cooled motor stator into the transmission housing, the installation time does not exceed the fourth time T 4 , the fourth period T 4 Not more than 15min.

[0011] Optionally, the holding pressure is 900-1000N, and the first time length T 1 For 30-40 minutes.

[0012] Optionally, after the step of applying a holding pressure to the motor stator, the installation method includes: Measuring a height difference h between a preset upper surface of the motor stator and a preset upper surface of the transmission housing; Compare the height difference h with the rated height difference h 0 , if |hh 0 |>0.3mm, disassemble the motor stator and transmission housing and reinstall them.

[0013] Optionally, after the step of applying a holding pressure to the motor stator, the installation method includes: Acquire multiple first point positions a on the preset upper surface of the motor stator i , and obtain multiple second point positions b on the preset upper surface of the transmission housing i , wherein the plurality of said first points are a i With a plurality of the second point position b i One-to-one correspondence in the height direction; Get the corresponding first point a i With the second point b i The height difference between i ; Get the height difference h between each two i The difference between i ; If there is △h i ≥0.4mm, disassemble the motor stator and transmission housing and reinstall them.

[0014] Through the above technical solution, the motor stator is cooled to increase the temperature difference between it and the transmission housing. Cooling the motor stator can reduce the overall volume of the motor stator and increase the gap between the motor stator and the transmission housing, so that the two are changed from interference fit to clearance fit, which is easier to assemble. In addition, when the motor stator is pressurized after assembly to reduce the cooling of the motor stator and the transmission housing, the probability of the axial relative position of the motor stator in the transmission housing shifting due to the asynchronous deformation of the transmission housing and the motor stator is increased, thereby improving the assembly accuracy of the motor stator and the transmission housing and improving the noise problem of the transmission.

[0015] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings: Figure 1 The present invention is a flowchart of a method for installing a motor stator according to an embodiment of the present invention.

[0017] Figure 2 is a flow chart of a method for installing a motor stator according to another embodiment of the present disclosure. DETAILED DESCRIPTION

[0018] The specific implementation of the present disclosure is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the present disclosure, and is not used to limit the present disclosure.

[0019] In the traditional motor stator installation method, the transmission housing is usually heated to increase the volume of the heated transmission housing and increase the gap between the mating surfaces of the two, so that the motor stator can be placed in the transmission housing for assembly. However, since the outer surface of the motor stator is matched with the inner surface of the transmission housing, the transmission housing will expand due to heat when the transmission housing is heated. However, during the expansion process, although the overall expansion of the transmission housing will cause its volume to increase and increase the gap between the mating surfaces of the transmission housing and the motor stator, since thermal expansion is multi-directional, while the housing expands as a whole, its inner surface will also expand inward. This results in an increase in the mating gap between the two, but the increased gap is small. The stator needs to be assembled into the transmission housing in a very short time to avoid the situation where the mating gap is reduced due to the reduction of the temperature difference, so that the motor stator cannot be placed in the transmission housing. This increases the difficulty of assembling the motor stator. At the same time, due to the short assembly time, there will be deviation in the assembly position, resulting in the deformation of the transmission housing and the motor stator being out of sync, which will cause the depth of the motor stator in the transmission housing to shift, causing the transmission noise problem.

[0020] To ensure that the electronic stator can be easily and reliably installed in the transmission housing, according to an embodiment of the present disclosure, Figure 1 As shown, a method for installing a motor stator is provided. The installation method may include step 101, that is, first cooling the motor stator to a first temperature C 1 , so that the outer diameter of the motor stator is reduced. After the motor stator is cooled to the required temperature, step 102 is performed to assemble the cooled motor stator into the transmission housing. The motor stator and the transmission housing are interference fit at room temperature. When the motor stator is cooled, the two are installed in a clearance fit manner. After the two are assembled, step 103 is performed to apply a holding pressure to the motor stator at the axial end of the motor stator, wherein the holding pressure time is the first time length T 1 That is to say, a constant pressure is applied to the motor stator for a period of time so that the motor stator maintains a stable relative position with the transmission housing in the axial direction to avoid displacement during the process of the motor stator returning to normal temperature.

[0021] Through the above technical solution, the motor stator is cooled to increase the temperature difference between it and the transmission housing. Cooling the motor stator can reduce the overall volume of the motor stator and increase the gap between the motor stator and the transmission housing, so that the two are changed from interference fit to clearance fit, which is easier to assemble. In addition, when the motor stator is pressurized after assembly to reduce the cooling of the motor stator and the transmission housing, the probability of the axial relative position of the motor stator in the transmission housing shifting due to the asynchronous deformation of the transmission housing and the motor stator is increased, thereby improving the assembly accuracy of the motor stator and the transmission housing and improving the noise problem of the transmission.

[0022] It should be noted that the first duration T 1 It can be 30 to 40 minutes, and in the step of applying holding pressure to the motor stator, the holding pressure can also be 900-1000N, so as to ensure the holding pressure effect and further reduce the probability of the axial relative position of the stator in the transmission housing being offset due to the asynchronous deformation of the housing and the stator when the stator returns to normal temperature.

[0023] Furthermore, if Figure 2 As shown, when the motor stator is cooled to a first temperature C 1 After the step of cooling the motor stator and before the step of assembling the cooled motor stator into the transmission housing, the installation method may include step 201, that is, heat-insulating the motor stator, wherein the heat-insulating time here may be a second time T 2 After the motor stator is cooled to the required temperature, keeping it warm for a certain period of time can ensure that the internal temperature of the motor stator is consistent with its outer surface, thereby increasing the time it takes for the temperature of the cooled motor stator to recover after it is moved to a normal temperature environment. 1 It can be -30℃ to -40℃, the second time length T 2 It may be 15 to 20 minutes, which is not limited in the present disclosure.

[0024] According to one embodiment of the present disclosure, Figure 2 As shown, before the step of assembling the cooled motor stator into the transmission housing, the installation method may further include step 202, that is, heating the transmission housing to a second temperature C 2 Thus, before the motor stator is installed with the transmission housing, the motor stator is cooled to the first temperature C. 1 , and the transmission housing can be heated to a second temperature C 2 , so as to increase the temperature difference between the two and make the gap between the two larger, which is not only more convenient for assembly, but also increases the time it takes for the two to return to room temperature, so that the gap between the two exists for a longer time, and it is also convenient to have enough time to make adjustments during installation, thereby improving installation accuracy. After heating the transmission housing, it can be kept warm, where the insulation time can be the third time T 3 , keeping warm for a certain period of time can ensure that the internal temperature of the transmission housing is consistent with its outer surface, thereby increasing the time it takes for the temperature of the heated transmission housing to decrease after it is moved to a normal temperature environment. It should be noted that here, the third time length T 3 It can be 15 to 20 minutes, the second temperature C 2 With the first temperature C 1 The temperature difference may be not less than 200°C. Specifically, the temperature may be 1 When the second temperature is -30℃ to -40℃, 2The temperature is 190° C. to 200° C., which is not limited in the present disclosure. The cooling of the motor stator and the heating of the transmission housing can be performed sequentially or simultaneously, so as to further save installation time.

[0025] How to determine whether the motor stator is cooled to the first temperature C 1 , and the transmission housing is heated to a second temperature C 2 In this way, the corresponding cooling device can be provided with a temperature sensing element to detect the surface of the motor stator and the transmission housing. 2 and the third duration T 3 Both are 15 minutes, the first temperature is C 1 The second temperature is -40℃. 2 Taking 190℃ as an example, when the temperature sensing element detects that the surface of the motor stator is -40℃, the cooling power output of the corresponding cooling device is ensured to maintain the cooling zone at the corresponding -40℃ for 15 minutes. When the temperature sensing element detects that the surface of the transmission case is 190℃, the heating power output of the corresponding heating device is ensured to maintain the heating zone at the corresponding 190℃ for 15 minutes.

[0026] According to one embodiment of the present disclosure, Figure 2 As shown, in the step of assembling the cooled motor stator into the transmission housing, step 203 can be performed first, that is, connecting the handling tooling to the motor stator. After the connection between the two is completed, step 204 is performed, and the motor stator is placed in the transmission housing by the handling tooling until the motor stator contacts the bottom of the transmission housing, so that the transmission housing can limit the motor stator. At this time, step 205 can be performed to rotate the motor stator to correspond the mark on the motor stator with the mark on the transmission housing. Specifically, the mark on the motor stator can be formed on its outer peripheral surface, and the mark on the transmission housing can be formed on its inner peripheral surface. After the mark correspondence is completed, a holding pressure is applied to the motor stator. After the holding pressure is completed, the handling tooling can be removed. Through mark positioning, it can be ensured that the motor stator is installed in the specified position of the transmission housing to prevent the circumferential mismatch caused by the temperature of the two returning to normal temperature, thereby ensuring the installation accuracy and reducing the probability of rework.

[0027] Regarding the connection method of the handling jig, since only a portion of the outer surface of the motor stator is in contact with the transmission housing after assembly is completed, in the step of connecting the handling jig to the motor stator, the installation method can be to clamp the handling jig and the upper edge of the motor stator (the clamped portion of the motor stator does not contact the transmission housing after the motor stator and the transmission housing return to normal temperature), or the handling jig can be a structure including a main rod and a plurality of abutting claws retractably connected to the main rod. In this way, when the handling jig is extended into the interior of the motor stator, the plurality of abutting claws can be abutted against the inner wall of the motor stator, thereby reducing the influence of the assembly of the outer surface of the motor stator and the transmission housing and improving the assembly accuracy.

[0028] In addition, to ensure that the motor stator can be smoothly installed with the transmission housing, in the step of assembling the cooled motor stator into the transmission housing, the installation time does not exceed the fourth time T 4 In this way, the installation time can be controlled to avoid the situation where the temperature difference decreases, resulting in a smaller fit clearance and the motor stator cannot be installed into the transmission housing. Here, T 4 It can be set according to demand, and can be no more than 15 minutes, specifically 10 minutes, or 5 minutes, and the present disclosure does not limit this.

[0029] According to one embodiment of the present disclosure, Figure 2 As shown, after the step of applying the holding pressure to the motor stator, the installation method may further include step 206, measuring the height difference h between the preset upper surface of the motor stator and the preset upper surface of the transmission housing. The preset upper surface here can be set according to the requirements. For example, the preset upper surface of the transmission housing can be the uppermost surface of the transmission housing in the height direction when installed, and the preset upper surface of the motor stator can be the uppermost surface of the motor stator in the height direction when installed. The present disclosure does not limit this. After measuring the height difference h between the two, step 207 can be performed, that is, setting the rated height difference h 0 , and to |hh 0 | is greater than 0.3mm to judge, if |hh 0 |>0.3mm, the assembly of the motor stator and the transmission housing is unqualified. The transmission housing may be out of sync with the deformation of the motor stator, resulting in the axial relative position of the motor stator in the transmission housing being offset, affecting the quality of the transmission. At this time, step 208 can be executed to disassemble the motor stator and the transmission housing and reinstall them. Specifically, the motor stator can be cooled again and the transmission housing can be heated to reinstall the two.

[0030] After the step of applying the holding pressure to the motor stator, further detection can be performed on the relevant data of the height difference, that is, a plurality of first point positions a can be obtained on the preset upper surface of the motor stator.i , and obtain multiple second point positions b on the preset upper surface of the transmission housing i , where multiple first points are a i With multiple second points b i One-to-one correspondence in the height direction, and obtain the corresponding first point a i With the second point b i The height difference between i , that is, to obtain the height difference between the motor stator and the transmission housing at multiple points. Then, the obtained multiple height differences h i In the above example, we subtract each pair from each other to obtain the height difference h between each pair. i The difference between i , if there exists △h i ≥0.4mm, it means that the assembly of the motor stator and the transmission housing is unqualified. The transmission housing may be out of sync with the deformation of the motor stator, resulting in the axial relative position of the motor stator in the transmission housing being offset, affecting the quality of the transmission. At this time, step 208 can be executed to disassemble the motor stator and the transmission housing and reinstall them. Specifically, the motor stator can be cooled again and the transmission housing can be heated to reinstall them. In the disclosed embodiment, any of the above two detection schemes can be used to determine whether the installation is accurate, or both detection schemes can be used at the same time, that is, if the relevant data of the height difference simultaneously satisfies |hh 0 |≤0.3mm and △h i If the height difference is less than 0.4mm, it indicates that the height difference between the motor stator and the transmission housing is qualified and the next process can be carried out.

[0031] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings; however, the present disclosure is not limited to the specific details in the above embodiments. Within the technical concept of the present disclosure, a variety of simple modifications can be made to the technical solution of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0032] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0033] In addition, various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. A method for installing a motor stator, characterized in that: The installation method comprises: Cooling the motor stator to a first temperature C1; Assembling the cooled motor stator into the transmission housing; and A holding pressure is applied to the motor stator at an axial end of the motor stator, wherein the holding pressure duration is a first duration T1.

2. The method for installing a motor stator according to claim 1, characterized in that: After the step of cooling the motor stator to the first temperature C1 and before the step of assembling the cooled motor stator into the transmission housing, the installation method further includes: insulating the motor stator, wherein the insulation time is a second time T2.

3. The method for installing a motor stator according to claim 2, characterized in that: The first temperature C1 is -30°C to -40°C; and / or The second time length T2 is 15-20 minutes.

4. The method for installing a motor stator according to claim 1, characterized in that: Before the step of assembling the cooled motor stator into the transmission housing, the installation method further includes: heating the transmission housing to a second temperature C2 and keeping the temperature constant, wherein the temperature constant time is a third time T3.

5. The method for installing a motor stator according to claim 4, characterized in that: The temperature difference between the second temperature C2 and the first temperature C1 is not less than 200° C.; and / or The third duration T3 is 15-20 minutes.

6. The method for installing a motor stator according to claim 1, characterized in that: The step of assembling the cooled motor stator into the transmission housing comprises: Connect the handling tooling to the motor stator; Putting the motor stator into the transmission housing by means of the handling tool until the motor stator contacts the bottom of the transmission housing; Rotate the motor stator to match the marking on the motor stator with the marking on the transmission case.

7. The method for installing a motor stator according to claim 1, characterized in that: In the step of assembling the cooled motor stator into the transmission housing, the installation time does not exceed a fourth time T4, and the fourth time T4 is no more than 15 minutes.

8. The method for installing a motor stator according to claim 1, characterized in that: The holding pressure is 900-1000N, and the first time length T1 is 30-40min.

9. The method for installing a motor stator according to claim 1, characterized in that: After the step of applying a pressure-maintaining pressure to the motor stator, the installation method comprises: Measuring a height difference h between a preset upper surface of the motor stator and a preset upper surface of the transmission housing; Compare the height difference h with the rated height difference h0. If |h-h0|>0.3mm, disassemble the motor stator and the transmission housing and reinstall them.

10. The method for installing a motor stator according to claim 1, characterized in that: After the step of applying a pressure-maintaining pressure to the motor stator, the installation method comprises: Acquire multiple first point positions a on the preset upper surface of the motor stator i , and obtain multiple second point positions b on the preset upper surface of the transmission housing i , wherein the plurality of said first points are a i With a plurality of the second point position b i One-to-one correspondence in the height direction; Get the corresponding first point a i With the second point b i The height difference between i ; Get the height difference h between each two i The difference between i ; If there is △h i ≥0.4mm, disassemble the motor stator and transmission housing and reinstall them.

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