Determination of ball bearing impedances under steady-state operating conditions using a further developed rolling contact model with full lubrication

使用进一步开发的完全润滑的滚动接触模型确定稳态运行条件下的滚珠轴承阻抗

• 批准号: 470273159
• 负责人: Professor Dr. Stefan Götz
• 金额: --
• 依托单位: Lehrstuhl für Maschinenelemente und Getriebetechnik (MEGT)
• 依托单位国家: 德国
• 项目类别: Research Grants
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/470273159?language=en
• 关键词: Determination; ball; bearing; impedances; under

As a result of the increasing use of frequency converters to control variable speed drive systems, electric motors and generators, the number of damages caused by parasitic bearing currents (corrugation, cratering, lubricant oxidation) in rolling bearings is increasing. To predict or prevent possible bearing damage, electrical drive systems can be modelled with equivalent circuit diagrams, considering the relevant main components of the motor as capacitive and resistive equivalent variables. In this consideration, the rolling bearing also acts as a capacitor. Its electrical behaviour depends significantly on the lubrication and friction conditions. Currently, the description of the interaction between the tribological system and the resulting defined electrical behaviour is a challenging task, which is realized by electromechanical models of the rolling contact with the help of electrical capacitances using correction factors and correction functions. For this purpose, experimental and simulative investigations will be carried out within the scope of the project in order to improve the electrical modelling of the rolling bearing and thus enable the possibility of more accurate modelling of the drive system.The subject area will be investigated within the work program in two groups (modelling and experiment) and in two levels each (single contact and rolling bearing level). Modelling is performed by means of coupled mechanical and electrical simulation of the rolling contact and detailed consideration of the boundary influences (or the inlet and outlet area of the contact). Experimental results using impedance and charge curve measurements are used for validation. In parallel, limitations and applicability of the developed and existing electrical contact models (and correction functions) will be determined using the electrical field investigations. The aim of the project is to develop an improved rolling bearing impedance model for (initially) purely axially loaded ball bearings under full lubrication conditions. The validated impedance model is to serve as the basis for deriving a physically based electrical rolling bearing model for combined axial/radial loaded rolling bearings with point contact. The investigations focus on the exact description of the operating condition through the computational and experimental determination of the electrical contact capacitance in the rolling bearing. Investigations of the mixed friction condition and electrical aging processes or damage mechanisms are not the subject of the project.

由于越来越多地使用变频器来控制变速驱动系统、电动机和发电机，滚动轴承中的寄生轴承电流（波纹、凹坑、润滑剂氧化）造成的损坏数量正在增加。为了预测或防止可能的轴承损坏，可以使用等效电路图对电力驱动系统进行建模，将电机的相关主要组件视为电容性和电阻性等效变量。考虑到这一点，滚动轴承也充当电容器。其电气行为很大程度上取决于润滑和摩擦条件。目前，描述摩擦系统与由此产生的定义的电气行为之间的相互作用是一项具有挑战性的任务，这是通过滚动接触的机电模型借助使用校正因子和校正函数的电容来实现的。为此，将在项目范围内进行实验和模拟研究，以改进滚动轴承的电气建模，从而使驱动系统的更准确建模成为可能。该主题领域将在工作计划内分两组（建模和实验）、每组两个级别（单接触和滚动轴承级别）进行研究。建模是通过滚动接触的机械和电气耦合模拟以及边界影响（或接触的入口和出口区域）的详细考虑来进行的。使用阻抗和电荷曲线测量的实验结果用于验证。同时，开发的和现有的电接触模型（和校正函数）的局限性和适用性将通过电场研究来确定。该项目的目的是为完全润滑条件下的（初始）纯轴向载荷球轴承开发改进的滚动轴承阻抗模型。经过验证的阻抗模型将作为推导具有点接触的组合轴向/径向负载滚动轴承的基于物理的电气滚动轴承模型的基础。研究重点是通过计算和实验确定滚动轴承中的电接触电容来准确描述运行条件。对混合摩擦条件和电老化过程或损坏机制的研究不是该项目的主题。