换向器是直流牵引电机的重要部件,其结构复杂,工艺要求高。表面的圆整、平滑程度及动态下的机械稳定性对牵引电机的运行质量有直接影响。过去只能在静态下用千分表作接触式测量,误差大,复现性差,而且仅限于静态检验。换向器的正常工作状态是高速旋转,且有一定温升,其表面状况与静态测量数据往往有很大出 Commutator DC traction motor is an important component of its complex structure, high process requirements. Surface roundness, smoothness and dynamic mechanical stability have a direct impact on the running quality of the traction motor. In the past can only be used in contact with the dial gauge for static measurement, error, poor reproducibility, and is limited to static test. Commutator normal working condition is high-speed rotation, and a certain temperature rise, the surface conditions and static measurement data are often very large