CN-122021167-A - Rotor punching self-adaptive lightweight design method meeting multiple physical field performances

CN122021167ACN 122021167 ACN122021167 ACN 122021167ACN-122021167-A

Abstract

The invention belongs to the technical field of motor design and optimization, and discloses a rotor punching self-adaptive lightweight design method meeting the performance of multiple physical fields, wherein more than one section of parameterized curve is selected; the method comprises the steps of sampling parameterized curves to obtain a plurality of rotor punching lightening hole profile samples, determining response variables according to the rotor punching lightening hole profile samples, performing finite element simulation to determine response variable values corresponding to the rotor punching lightening hole profile samples, wherein the response variables comprise physical attribute variables and geometric variables, determining more than one curve characteristic according to the rotor punching lightening hole profile samples, establishing a proxy model of the response variables and the curve characteristics for the response variables with uncertainty, and searching parameterized curves meeting curve characteristic constraint conditions and response variable constraint conditions based on the proxy model to obtain the rotor punching lightening hole profile. The invention can fully balance the performance constraint of multiple physical fields and realize the maximum light-weight effect.

Inventors

GUO XIN
LIAO HAILONG
LAI JUNHONG
LI XURUI
LI JUN
ZHAO WU
YU MIAO
ZHANG KAI
JIANG LINHONG

Assignees

四川大学

Dates

Publication Date: 20260512
Application Date: 20260202

Claims (10)

1. A rotor punching self-adaptive lightweight design method meeting the requirement of multiple physical field properties is characterized by comprising the following steps: S1, selecting more than one section of parameterized curve; s2, sampling the parameterized curve to obtain a plurality of rotor punching lightening hole profile samples; S3, determining response variables according to the weight-reducing hole profile samples of each rotor punching sheet, and performing finite element simulation to determine response variable values corresponding to the weight-reducing hole profile samples of each rotor punching sheet, wherein the response variables comprise physical attribute variables and geometric variables; s4, determining more than one curve characteristic according to the profile sample of the lightening hole of each rotor punching sheet; s5, for response variables with uncertainty, establishing a proxy model of the response variables and curve characteristics; and S6, searching a parameterized curve meeting curve characteristic constraint conditions and response variable constraint conditions based on the agent model, and obtaining the profile of the lightening hole of the rotor punching sheet.
2. The method for adaptively designing a rotor punching sheet with light weight and meeting the requirement of multiple physical field performance according to claim 1, wherein in the step S1, the initial contour construction step of a lightening hole of the rotor punching sheet is as follows: s11, selecting more than one section of parameterized curve; s12, adding parameterized curve constraint; s13, determining the Bezier curve order.
3. The method for adaptively designing a rotor sheet with reduced weight according to claim 1, wherein in step S11, the parameterized curve is selected from NURBS curve or bezier curve.
4. The method for adaptively designing a rotor sheet with multiple physical field properties according to claim 3, wherein when the rotor sheet is of a symmetrical structure, two sections of bezier curves with symmetry are selected, and the head and tail end points of the two sections of bezier curves are located on the projection center line of the rotor sheet.
5. The method for adaptively designing a rotor punching sheet with light weight for satisfying multiple physical field performance according to claim 4, wherein in step S12, two control points are designed for each section of parameterized curve, so that the tangential direction at the head and tail end points of the corresponding parameterized curve is perpendicular to the projection center line of the rotor punching sheet; In step S13, a control point between the head and tail ends is designed for each section of parametric curve, and the distance from the control point to the projection center line of the rotor sheet is greater than 0, so that each section of parametric curve comprises five control points, and a plurality of groups of fourth-order bezier curves are determined.
6. The method for adaptively designing a rotor sheet with reduced weight for satisfying multiple physical field performance according to any one of claims 1 to 5, wherein in step S2, the sampling method is latin hypercube sampling, monte carlo sampling or quadrature sampling.
7. The method for adaptively designing a rotor sheet with multiple physical field properties according to claim 6, wherein in step S3, for a generator rotor sheet, the physical attribute variables include one or more of an empty electromotive force amplitude, an empty electromotive force waveform distortion rate and a sheet stress, for a motor rotor sheet, the physical attribute variables include one or more of an air gap flux density sine degree, a back electromotive force, a cogging torque and a sheet stress, and the geometric variables are closed curve areas.
8. The adaptive lightweight design method for rotor punching sheet satisfying multiple physical field performance as described in claim 7, wherein in step S4, the curve characteristic includes one or more of a barycenter ordinate, an aspect ratio, a width scale factor of different control points, and a maximum curvature.
9. The method for adaptively designing a rotor punching sheet with light weight to meet the requirement of multiple physical field performance according to claim 8, wherein in step S5, a gaussian process regression, a random forest or a neural network method is adopted to build a proxy model of response variables and curve characteristics.
10. The method for adaptively designing a rotor punching sheet with light weight according to claim 9, wherein in step S6, a genetic algorithm, a particle swarm optimization or a bayesian optimization algorithm is used to find a parameterized curve satisfying the constraint condition of the response variable.

Description

Rotor punching self-adaptive lightweight design method meeting multiple physical field performances Technical Field The invention belongs to the technical field of motor design and optimization, relates to a rotor punching sheet lightweight design method, and particularly relates to a rotor punching sheet self-adaptive lightweight design method meeting the requirement of multiple physical field performances. Background For motor manufacturing type enterprises, optimizing rotor design to reduce rotor weight has a significant positive impact on both company economics and product performance. In the short term, the reduction of the weight of the rotor can reduce the use of raw materials, reduce the production cost and improve the power density of the motor, in the long term, the reduction of the quality of the rotor can reduce the bearing load, reduce the integral impact and loss of the rotor to the motor unit when the rotor is started and stopped, and effectively improve the stability of the motor unit in the long-term operation process. In motor products, the rotor is the main part bearing load, often also is an important part for providing a magnetic field, in particular to a rotor punching sheet in a motor, is a key part for fixing a magnet and conducting magnetic force, so that when the rotor punching sheet is designed in a lightweight way, the main physical performance of the punching sheet needs to be ensured not to be influenced. In the prior art, the rotor punching weight reducing holes are mostly designed in a round or square shape with insufficient geometric flexibility. The circular holes have low stress concentration but limited weight reducing effect, and the square holes have large area but easily cause stress concentration at right angles and disturb the magnetic circuit. The fundamental defect is that the fixed geometric form cannot adapt to the non-uniform physical field (such as stress and magnetic density) distribution in the rotor, so that a designer usually adopts conservative trade-off between performance and light weight, and the weight reduction potential cannot be fully exerted. Therefore, there is a need in the art for a high performance lightweight design method that automatically accommodates multiple physical field performance constraints. Disclosure of Invention Aiming at the defects in the prior art, the invention provides a rotor punching self-adaptive lightweight design method meeting the performance of multiple physical fields, the lightweight design is carried out on the punching by adopting a parameterized curve, and the constraint of the performance of the multiple physical fields is fully balanced through a proxy model and an optimization algorithm, so that the maximum lightweight effect is realized. Assuming that there is an optimal curve profile that is quite different from the profile of conventional circular and square holes and that allows the weight-reducing holes with this profile to achieve the maximum area of the weight-reducing holes of the punched sheet with little impact on the properties of the punched sheet, finding an optimal curve and for the punched sheet weight-reducing design would have extremely important economic value. It is not difficult to think that finding the equation expression of the optimal curve is the optimal way, solving the curve equation can be achieved by solving the functional extremum through a variational method, however, the rotor punching sheet plays roles of magnetic conduction and magnet fixation, so that the optimal curve needs to meet the requirements on magnetic conduction and mechanics, the number of physical performance requirements is large, the physical performance is often obtained based on completely different physical theories, the difficulty of solving the functional extremum through the variational method is too great, and other methods are needed to obtain the curve equation or the suboptimal curve similar to the optimal curve. In computer graphics, parametric curves (e.g., NURBS curves, spline curves, bezier curves, etc.) have long been proposed for their excellent flexibility for wide application in aerospace, marine, data fitting, computer graphics fabrication, etc. Based on the excellent flexibility of the parameterized curve, it can be presumed that, assuming that a certain optimal curve profile exists, the area of the lightening holes is maximized on the premise that the physical properties of the punched sheet are not affected, then the curve profile can be approximated by the parameterized curve, and a suboptimal curve with a slightly poorer effect is obtained. Therefore, the curve equation for solving the optimal curve is converted into the parameter for solving the suboptimal curve. Based on the analysis, the invention provides a rotor punching self-adaptive lightweight design method meeting the performance of multiple physical fields, which comprises the following steps: S1, selecting more than one section