大型交直流变速电机轴承比压评价数据
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大型交直流变速电机轴承比压是轴承性能的重要参数之一，直接影响着其负荷承受能力、磨损和寿命、刚度等方面。考虑到轴承比压对轴承性能的重要影响，大型交直流变速电机轴承的设计和选型时需要对比压进行充分考虑，以保证轴承在工作过程中的性能和寿命。轴承比压（即载荷比压）包括轴承径向比压和轴承横向比压，轴承径向比压是指轴承受的载荷与径向接触面积之比，轴承横向比压是指轴承承受的载荷与径向接触面积之比。1、数据采集：大型交直流变速电机轴承加工完成后，采用内径千分尺测定轴瓦内径，采用油标卡尺测定轴瓦宽度，采用载荷试验机测定单个轴承的径向工作载荷和横向工作载荷。2、数据处理：通过计算得到同步电动机轴承径向比压值和轴承横向比压值：轴承径向比压(N/mm2)=轴承经向工作载荷(Kg)×10/(轴瓦直径(mm)×轴瓦有效宽度(mm))进行计算，得出轴承径向比压值。轴承横向比压(N/mm2)=轴承横向工作载荷(Kg)×10/(轴瓦直径(mm)×轴瓦有效宽度(mm))进行计算，得出轴承横向比压值。3、数据评价：参比大型交直流变速电机径向比压标准和横向比压标准，如果轴承径向比压值≤1.5，轴承横向比压值≤1.0，则判定为合格；如果轴承径向比压值>1.5，轴承横向比压值>1.0，则判定为不合格。
The specific pressure of bearings for large AC/DC variable-speed motors is one of the critical parameters governing bearing performance, which directly impacts load-bearing capacity, wear, service life, and stiffness, among other key aspects. Given the substantial influence of bearing specific pressure on bearing performance, full consideration must be given to this parameter during the design and selection of bearings for large AC/DC variable-speed motors, to ensure the performance and service life of the bearings during operational use. Bearing specific pressure (also referred to as load specific pressure) encompasses two categories: radial specific pressure and transverse specific pressure of bearings. The radial specific pressure of a bearing is defined as the ratio of the load borne by the bearing to its radial contact area, while the transverse specific pressure is defined as the ratio of the load borne by the bearing to its radial contact area. 1. Data Collection: Upon completion of machining for the bearings of large AC/DC variable-speed motors, the inner diameter of the bearing shells is measured using an inside micrometer, the width of the bearing shells is measured with a vernier caliper, and the radial and transverse working loads of a single bearing are measured via a load testing machine. 2. Data Processing: The radial and transverse specific pressure values of synchronous motor bearings are calculated through the following formulas: - Radial Specific Pressure (N/mm²) = (Radial Working Load of Bearing (Kg) × 10) / (Bearing Shell Diameter (mm) × Effective Width of Bearing Shell (mm)) - Transverse Specific Pressure (N/mm²) = (Transverse Working Load of Bearing (Kg) × 10) / (Bearing Shell Diameter (mm) × Effective Width of Bearing Shell (mm)) 3. Data Evaluation: With reference to the radial and transverse specific pressure standards for large AC/DC variable-speed motor bearings, a bearing is deemed qualified if its radial specific pressure value ≤ 1.5 N/mm² and transverse specific pressure value ≤ 1.0 N/mm²; conversely, it is judged unqualified if the radial specific pressure value > 1.5 N/mm² and transverse specific pressure value > 1.0 N/mm².
