CN112651077A - Method for determining assembly interference magnitude and heat preservation point of motor stator - Google Patents
Method for determining assembly interference magnitude and heat preservation point of motor stator Download PDFInfo
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Abstract
The invention discloses a method for determining the assembly interference magnitude and the heat preservation point of a stator of a hybrid motor, which comprises the steps of firstly calculating the assembly working condition and the working condition (after temperature rise) to obtain the deformation magnitude of a motor shell, a gearbox shell, the stress strain magnitude of each part, the combination pressure between the motor stator and the shell, and the like, evaluating according to the evaluation standards of transmission torque, stress strain, maximum deformation magnitude and the like to obtain the optimal value range of the assembly interference magnitude of the motor stator, carrying out statistical analysis and data fitting on the deformation magnitude of the motor shell along with the temperature change trend to obtain the change curve and the fitting function of the heat preservation point, and providing reference for the design of the final scheme. The calculated value result is more definite and efficient, the product design and development period can be obviously shortened, the development cost can be saved, and the method can be effectively used for the assembly process design of products.
Description
Technical Field
The invention relates to the technical field of automobile assembly, in particular to a technology of a stator assembly interference magnitude and a heat preservation point of a hybrid motor.
Background
The stator and the shell of some hybrid power motors in the market transmit torque by interference fit, and a certain interference magnitude is arranged between the stator of the motor and the shell of the motor, so that the shell of the motor needs to be heated to a certain temperature point in the process of installing the stator of the motor into the shell of the motor, the thermal expansion magnitude of the assembling surface of the shell is greater than the interference magnitude, the assembling is completed, and the corresponding temperature is called as a heat preservation point. The interference magnitude is defined to be too large, the motor shell deforms outwards under the force generated by interference fit to cause the diameter size to be enlarged, and the assembly formed by the motor stator and the motor shell is difficult to assemble or cannot be assembled into the gearbox shell; the interference is defined to be too small, and the mounting surfaces will in turn not provide sufficient friction for transmitting the torque. Therefore, accurately calculating the numerical values of the heat preservation point and the interference is the key to whether the assembly is successful.
The traditional interference fit is calculated based on GB/T5371-2004 'calculation and selection of limit and fit interference fit', but the influence of factors such as uneven structural rigidity distribution, contact nonlinearity, dynamic change of material parameters along with temperature and the like existing in practical application of an accommodating part and an accommodated part is not considered, and a calculation result has certain deviation on the guiding effect of the practical application. Generally, the motor housing is not an ideal cylindrical structure, the radial deformation amount is different at different positions and different angles, and accurate deformation distribution and joint surface pressure distribution results cannot be obtained through calculation of empirical formulas. When the interference magnitude is not selected properly, the deformation magnitude is too large or the bearing torque is small, and then the optimization scheme needs to be adjusted repeatedly, so that a large amount of cost and time are consumed for improvement.
Disclosure of Invention
The invention aims to solve the technical problem of realizing a method for determining the assembly interference magnitude and the heat preservation point of the stator of the hybrid motor.
In order to achieve the purpose, the invention adopts the technical scheme that: a method for determining the assembling interference magnitude and the heat preservation point of a motor stator comprises the following steps:
step 1, collecting geometric models of a motor shell, a motor stator, a gearbox shell and connecting bolts, and finishing pre-treatment work such as component assembly, grid division and the like;
step 2, completing analysis of normal-temperature assembly working conditions and working temperature working conditions, and extracting data such as deformation, stress values and combined pressure values of assembly surfaces of all parts;
step 3, taking the maximum deformation not exceeding the reserved design gap, the maximum stress value not exceeding the yield strength of the part, the minimum joint surface pressure ensuring the torque transmission of the motor and the like as constraint targets, and carrying out statistical analysis on the calculation result data to obtain the setting range of the interference magnitude;
and 4, analyzing the temperature rise working condition deformation data of the motor shell monomer to obtain a temperature rise deformation curve and a fitting function of the motor stator monomer, and selecting the numerical values of the assembling heat preservation points in different interference ranges according to the fitting function and the curve.
In the step 1, the influence of temperature is required to be considered for material parameters, and the involved material parameters comprise elastic modulus, density, linear expansion coefficient and material plasticity curve; meanwhile, each part adopts a geometric digital-analog with detailed characteristics, and the influence of the actual structural rigidity is considered.
In the step 2, the normal temperature working condition refers to an assembly working condition at 25 ℃, and the working temperature working condition refers to the highest working condition after the temperature is raised to 125 ℃; the working condition of the intermediate process temperature can be increased every 20 ℃; and after the static strength analysis of each working condition is finished, extracting the deformation, the stress value and the combined surface pressure value data, and exporting the values in a text file form.
In the step 3, a certain gap is required to be ensured between the motor shell and the gearbox shell to avoid interference or extrusion phenomena according to the results of the normal-temperature assembly working condition and the working temperature working condition, and the upper limit value of the interference magnitude is respectively determined according to the standard.
In the step 3, the results of the normal-temperature assembly working condition and the working temperature working condition, the combination pressure value of the motor stator and the motor shell must ensure that the maximum motor torque can be transmitted, and the lower limit value of the interference magnitude is respectively determined according to the standard.
In step 3, the normal temperature assembly working condition and working temperature working condition results, and the stress values of the motor stator and the motor shell part must be ensured not to exceed the yield stress of each part, and the upper limit value of the interference magnitude is respectively determined according to the standard.
In the step 4, the deformation trend of the motor shell along with the temperature needs to be calculated independently, the deformation result is extracted, then data statistics and function fitting are carried out, and the selection range of the temperature variable needs to cover the actual use temperature range.
The invention evaluates whether the design parameters meet the check standard from a plurality of design angles, and selects the optimal and reasonable assembly interference range by utilizing the data processing means of linear programming to meet the actual requirements. The method simultaneously considers the influence of the detailed structural rigidity of the motor shell and the transmission shell on the deformation and the influence of temperature change on material parameters such as elastic modulus, linear expansion coefficient and material plasticity, and effectively avoids the problems of poor positioning size after hot sleeving, difficulty in box closing or incapability of assembling and the like, and the problem of low yield. The calculated value result is more definite and efficient, the product design and development period can be obviously shortened, the development cost can be saved, and the method can be effectively used for the assembly process design of products.
Drawings
The following is a brief description of the contents of each figure in the description of the present invention:
FIG. 1 is a flow chart of a method for determining the assembly interference and the heat preservation point of a motor stator;
FIG. 2 is a radial deformation curve of a section of the motor housing;
FIG. 3 is a graph of the holding point of a hybrid motor housing.
Detailed Description
The following description of the embodiments with reference to the drawings is provided to describe the embodiments of the present invention, and the embodiments of the present invention, such as the shapes and configurations of the components, the mutual positions and connection relationships of the components, the functions and working principles of the components, the manufacturing processes and the operation and use methods, etc., will be further described in detail to help those skilled in the art to more completely, accurately and deeply understand the inventive concept and technical solutions of the present invention.
The method considers the influence of factors such as detailed structural rigidity of the part, contact nonlinearity, dynamic change of material parameters along with temperature and the like on the deformation. The method comprises the steps of analyzing the assembling working condition and the temperature rise working condition of a motor stator, a motor shell and a gearbox shell in finite element simulation software, analyzing and processing data of a calculation result, formulating a reasonable value range of assembling interference according to different evaluation standards, and determining the lowest heat insulation point of the shell in the operation process of assembling the motor stator to the motor shell. The calculation method is more efficient and direct, the reasonable design range of the interference magnitude and the minimum heat preservation point required during installation are quickly obtained, the problems of out-of-tolerance deformation, low yield and the like in the later stage of product development are effectively avoided, and the product design and development period is shortened.
In order to realize the purpose, the invention adopts the technical scheme that: a method for determining the assembling interference and the heat preservation point of a stator of a hybrid motor is disclosed as shown in figure 1, and comprises the following detailed steps:
step 1, collecting and assembling three-dimensional models such as a motor stator, a motor shell, a gearbox shell and connecting bolts, and performing finite element pretreatment. The assembly relation is required to be consistent with the actual situation, the temperature boundary increment is calculated to cover the temperature process of each part in the actual work, and the preset assembly interference range and increment step length can be properly widened.
And 2, completing simulation calculation analysis of the assembly working condition, the temperature rise working condition and the single body temperature rise working condition of the motor shell, extracting the deformation of the motor shell, the deformation of the gearbox shell (the result is shown in figure 2) and the combined surface pressure value between the motor stator and the motor shell, and exporting the values in a text mode.
Step 3, analyzing the calculation result of the assembly working condition, ensuring that a certain gap exists between the motor shell and the gearbox shell to avoid interference, and determining an interference upper limit value max1 according to the standard; during assembly working conditions, the combination pressure of the motor stator and the motor shell and the stress strain value of the components must be ensured to be capable of transmitting the maximum motor torque while not exceeding the yield stress of each component, and the lower limit value min1 and the upper limit value max2 of the interference magnitude are respectively determined according to the two standards.
Analyzing the temperature rise working condition calculation result, and determining an interference upper limit value delta max3 according to the standard, wherein the situation that the squeezing phenomenon does not occur between the motor shell and the transmission shell at the maximum working temperature needs to be guaranteed; similarly, the combination pressure of the stator and the motor shell of the motor and the stress of components under the temperature rise working condition also need to ensure that the maximum motor torque can be transmitted while the yield stress of each component is not exceeded, and the lower limit value delta min2 and the upper limit value delta max4 of the interference are respectively determined according to the two standards.
Step 4, integrating the upper limit value and the lower limit value of the interference in the step 3, and determining a reasonable value range [ delta min, delta max ] of the assembly interference; and processing the temperature rise working condition deformation data of the motor shell monomer to obtain a temperature rise deformation curve and a fitting function of the motor stator monomer. And finally, selecting actual interference magnitude data according to a reasonable value range of the assembly interference magnitude, and selecting the numerical value of the assembly lowest heat preservation point with different interference magnitudes according to a fitting function and a curve graph (as shown in fig. 3).
The invention has been described above with reference to the accompanying drawings, it is obvious that the invention is not limited to the specific implementation in the above-described manner, and it is within the scope of the invention to apply the inventive concept and solution to other applications without substantial modification.
Claims (7)
1. A method for determining the assembling interference magnitude and the heat preservation point of a motor stator is characterized by comprising the following steps: the method comprises the following steps:
step 1, collecting a geometric model of a part, wherein the part comprises a motor shell, a motor stator, a gearbox shell and connecting bolts, and assembling and meshing the part;
step 2, completing analysis of normal-temperature assembly conditions and working temperature conditions, and extracting deformation, stress values and combined pressure value data of assembly surfaces of each component;
step 3, taking the maximum deformation not exceeding the reserved design gap, the maximum stress value not exceeding the yield strength of the part and the minimum joint surface pressure ensuring the torque transmission of the motor as a constraint target, and carrying out statistical analysis on the calculation result data to obtain the setting range of the interference magnitude;
and 4, analyzing the temperature rise working condition deformation data of the motor shell monomer to obtain a temperature rise deformation curve chart and a fitting function of the motor stator monomer, and selecting the numerical values of the assembling heat preservation points in different interference ranges according to the fitting function and the curve chart.
2. The method for determining the assembling interference and the heat preservation point of the stator of the motor according to claim 1, wherein the method comprises the following steps: in the step 1, the material parameters of the geometric model of the component include parameters affecting temperature and parameters affecting structural rigidity, and the parameters affecting temperature include elastic modulus, density, linear expansion coefficient and material plasticity curve.
3. The method for determining the assembling interference and the heat preservation point of the stator of the motor according to claim 1, wherein the method comprises the following steps: in the step 2, the normal temperature working condition is an assembly working condition when the temperature is 25 ℃, the working temperature working condition is the highest working condition of more than or equal to 125 ℃, the intermediate history temperature working condition is added every 20 ℃ from the normal temperature working condition to the working temperature working condition, and after the static strength analysis of each working condition is completed, the deformation, the stress value and the binding surface pressure value data are extracted and exported in the form of a text file.
4. The method for determining the assembling interference and the heat preservation point of the stator of the motor according to claim 1, wherein the method comprises the following steps: in the step 3, the analysis process of the normal-temperature assembly working condition and the working temperature working condition ensures that a gap exists between the motor shell and the transmission shell, the gap value standard is to avoid interference or extrusion, and the upper limit value of the interference magnitude is determined according to the obtained gap value.
5. The method for determining the assembling interference and the heat preservation point of the stator of the motor according to claim 1, wherein the method comprises the following steps: in the step 3, the normal temperature assembly working condition and the working temperature working condition are analyzed to obtain a motor stator-motor shell combined pressure value, the maximum motor torque can be transmitted by combining the pressure value, and the lower limit value of the interference magnitude is determined according to the combined pressure value corresponding to the maximum motor torque.
6. The method for determining the assembling interference and the heat preservation point of the stator of the motor according to claim 1, wherein the method comprises the following steps: in the step 3, stress values of parts of the motor stator and the motor shell are obtained in the analysis process of the normal-temperature assembly working condition and the working temperature working condition, the stress values of the parts are guaranteed not to exceed the yield stress of the parts, and the upper limit value of the interference magnitude is determined according to the stress values of the parts corresponding to the yield stress.
7. The method for determining the assembling interference and the heat preservation point of the stator of the motor according to claim 1, wherein the method comprises the following steps: in the step 4, the deformation trend of the motor shell along with the temperature needs to be calculated separately, the deformation result is extracted, then data statistics and function fitting are carried out, and the selection range of the temperature variable needs to cover the actual use temperature range.
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| CN116562106A (en) * | 2023-07-04 | 2023-08-08 | 中国航发四川燃气涡轮研究院 | Method for designing tightness of rotor spigot of aero-engine compressor |
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| CN113722778A (en) * | 2021-09-01 | 2021-11-30 | 株洲齿轮有限责任公司 | Design method for interference fit of new energy motor stator assembly and shell |
| CN116562106A (en) * | 2023-07-04 | 2023-08-08 | 中国航发四川燃气涡轮研究院 | Method for designing tightness of rotor spigot of aero-engine compressor |
| CN116562106B (en) * | 2023-07-04 | 2023-10-03 | 中国航发四川燃气涡轮研究院 | Method for designing tightness of rotor spigot of aero-engine compressor |
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