CN-121996964-A - NVH performance evaluation method and device for driving motor

CN121996964ACN 121996964 ACN121996964 ACN 121996964ACN-121996964-A

Abstract

The invention relates to the technical field of motors, in particular to a method and a device for evaluating NVH performance of a driving motor, comprising the following steps of S1, obtaining time domain electromagnetic force distribution data on stator teeth of each oblique pole section of a target motor through electromagnetic simulation, S2, carrying out space domain equivalent synthesis on electromagnetic force of each oblique pole section to generate a global equivalent electromagnetic force time domain signal, S3, carrying out frequency domain-order joint analysis on the global equivalent electromagnetic force time domain signal, identifying a target frequency point with obvious influence on NVH performance, extracting a corresponding main space order and a main time order under the target frequency point to obtain a corresponding synthesized excitation force amplitude, S4, calculating electromagnetic force phase difference between at least two groups of oblique pole sections under the target frequency point and the main space order and the main time order based on the time domain electromagnetic force distribution data, and generating a phase difference representation quantity, and S5, inputting the target frequency point, the synthesized excitation force amplitude and the phase difference representation quantity into an NVH performance evaluation model, and outputting the NVH performance index.

Inventors

ZHOU FENG
DENG JING
CHAI HONGSHENG
WANG ZHUO

Assignees

辰致汽车科技集团有限公司重庆创新研究分公司
辰致汽车科技集团有限公司

Dates

Publication Date: 20260508
Application Date: 20260126

Claims (6)

1. The NVH performance evaluation method for the driving motor is characterized by comprising the following steps of: S1, acquiring time domain electromagnetic force distribution data on stator teeth of each oblique pole section of a target motor through electromagnetic simulation, wherein the time domain electromagnetic force distribution data comprises a radial component and a tangential component; S2, performing space domain equivalent synthesis on electromagnetic force of each oblique pole segment to generate a global equivalent electromagnetic force time domain signal representing integral excitation of the motor; S3, carrying out frequency domain-order joint analysis on the global equivalent electromagnetic force time domain signal, identifying a target frequency point with obvious influence on NVH performance, extracting a main spatial order and a main time order corresponding to the target frequency point, and obtaining a synthesized excitation force amplitude corresponding to the main spatial order and the main time order; s4, calculating electromagnetic force phase differences between at least two groups of oblique pole segments under the target frequency point, the main space order and the main time order based on the time domain electromagnetic force distribution data of the S1, and generating phase difference characterization quantities; s5, inputting the target frequency point, the synthesized excitation force amplitude and the phase difference characterization quantity into a pre-constructed NVH performance evaluation model, and outputting a corresponding NVH performance index.
2. The method for evaluating NVH performance of driving motor according to claim 1, wherein the NVH performance index comprises acoustic power or equivalent radiated acoustic power.
3. The method for evaluating NVH performance of the driving motor according to claim 1, wherein the NVH performance evaluation model is obtained through training of multi-physical field coupling simulation data or actual measurement test data and is constructed by adopting a machine learning model; The machine learning model includes a support vector machine model, a neural network model, or a gaussian process regression model.
4. The method for evaluating NVH performance of driving motor according to claim 3, wherein said neural network model is BP neural network model; The input layer of the BP neural network model comprises three neurons which are respectively used for receiving a target frequency point, a synthesized excitation force amplitude and a phase difference characterization quantity; the output layer of the BP neural network model comprises a neuron which is used for outputting NVH performance indexes; The BP neural network model adopts a nonlinear activation function and is trained through a numerical optimization algorithm.
5. The method for evaluating NVH performance of driving motor according to claim 1, wherein the frequency domain-order joint analysis is implemented by two-dimensional Fourier transform for synchronously analyzing harmonic characteristics of electromagnetic excitation in time and space dimensions.
6. A drive motor NVH performance evaluation apparatus, comprising: The electromagnetic force data acquisition module is used for executing the electromagnetic force data acquisition module, wherein the electromagnetic force data acquisition module is used for acquiring time domain electromagnetic force distribution data on stator teeth of each oblique pole section of the target motor through electromagnetic simulation, and the time domain electromagnetic force distribution data comprises radial components and tangential components; the excitation synthesis module is used for performing space domain equivalent synthesis on electromagnetic force of each oblique pole section to generate a global equivalent electromagnetic force time domain signal representing integral excitation of the motor; the main order feature extraction module is used for executing frequency domain-order joint analysis on the global equivalent electromagnetic force time domain signal, identifying a target frequency point with obvious influence on NVH performance, extracting a main space order and a main time order corresponding to the target frequency point, and obtaining a synthesized excitation force amplitude corresponding to the main space order and the main time order; The phase difference calculation module is used for executing the calculation of electromagnetic force phase differences between at least two groups of oblique pole segments under the target frequency point, the main space order and the main time order based on the time domain electromagnetic force distribution data acquired by the electromagnetic force data acquisition module, and generating phase difference characterization quantities; And the evaluation model module is used for executing the steps of inputting the target frequency point, the synthesized excitation force amplitude and the phase difference characterization quantity into a pre-constructed NVH performance evaluation model and outputting a corresponding NVH performance index.

Description

NVH performance evaluation method and device for driving motor Technical Field The invention relates to the technical field of motors, in particular to a method and a device for evaluating NVH performance of a driving motor. Background With the rapid development of the electric automobile industry, the performance requirement of a driving system is continuously improved, wherein NVH (noise, vibration and harshness) performance has become a key index for measuring the quality of a driving motor and directly influencing the riding comfort of the whole automobile. The NVH problem of the driving motor is accurately predicted and effectively restrained, and the method has important significance for improving the acoustic quality of the whole vehicle and enhancing the market competitiveness of the product. In current drive motor NVH research, constructing a high-fidelity multi-physical-field coupling simulation model (generally covering electromagnetic fields, structural dynamics fields and acoustic fields) based on a physical mechanism is a mainstream technical path. The full-order model can comprehensively describe the whole process of generating electromagnetic exciting force in the motor, transmitting structural dynamic response and generating and transmitting radiation noise, and has higher analysis precision and engineering reference value. However, there are significant limitations to the full-order multiple physical field coupling model, which are mainly manifested in the following three aspects: 1. The calculation complexity is high, the resource consumption is high, the full-order model usually comprises a large number of degrees of freedom, a high-performance calculation cluster is needed when transient dynamics simulation or frequency response analysis is carried out, and the single simulation can take hours or even days. In the scene that parameterization research, scheme comparison and multi-round iterative optimization are required to be frequently carried out in the early stage of motor design, the efficiency is difficult to meet the requirement of rapid feedback in engineering practice. 2. The real-time performance is poor, the system integration is difficult, and because the model is large in scale and complex in solving process, a system-level simulation platform such as whole vehicle multi-body dynamics or electric drive system joint simulation cannot be embedded, and the development of online NVH evaluation or active noise control strategies cannot be supported, so that the deployment capability of the system in wider engineering application is limited. 3. The optimization efficiency is low, and in the design optimization process facing NVH performance, parameters such as the angle of the inclined pole, the fit of the slot pole, the stator structure and the like are optimized, so that a large number of design schemes need to be repeatedly evaluated. The high calculation cost of the full-order model makes the optimization method based on simulation extremely time-consuming and poor in economical efficiency, and severely restricts the realization of the efficient design flow. Disclosure of Invention The invention aims to provide a modulation mode switching method and device for a motor controller, which can solve the problems of high calculation cost, low efficiency and difficult integration of the existing full-order multi-physical field coupling simulation method. In order to achieve the above purpose, the technical scheme adopted by the invention is as follows: in a first aspect, the invention discloses a method for evaluating NVH performance of a driving motor, which comprises the following steps: S1, acquiring time domain electromagnetic force distribution data on stator teeth of each oblique pole section of a target motor through electromagnetic simulation, wherein the time domain electromagnetic force distribution data comprises a radial component and a tangential component; S2, performing space domain equivalent synthesis on electromagnetic force of each oblique pole segment to generate a global equivalent electromagnetic force time domain signal representing integral excitation of the motor; S3, carrying out frequency domain-order joint analysis on the global equivalent electromagnetic force time domain signal, identifying a target frequency point with obvious influence on NVH performance, extracting a main spatial order and a main time order corresponding to the target frequency point, and obtaining a synthesized excitation force amplitude corresponding to the main spatial order and the main time order; s4, calculating electromagnetic force phase differences between at least two groups of oblique pole segments under the target frequency point, the main space order and the main time order based on the time domain electromagnetic force distribution data of the S1, and generating phase difference characterization quantities; s5, inputting the target frequency point, the synthesized excit