高速电主轴动态非接触电磁加载研究

针对高速电主轴接触式加载存在结构复杂、磨损及振动大等问题，提出一种非接触式电磁加载方法。该方法中动态电磁力可模拟主轴实际切削力载荷，实现高速电主轴动态非接触加载。利用电磁理论建立了非接触电磁加载模型，分析了电磁力的影响因素。解决了实现电磁加载的关键技术，并完成加载实验台整体设计。在转速为9 000 r/min、励磁电流为40 mA的加载条件下，针对170MD18Y16型磨削电主轴进行了动态加载实验，并对比了励磁电流和转速变化时动态电磁力的理论和实测值。结果表明，动态加载理论值与实测值变化一致，二者误差较小，验证了动态非接触电磁加载方法的有效性，且改变励磁电流和转速可实现不同条件的加载。

Non-contact Dynamic Electromagnetic Loading on High Speed Motorized Spindle

A non-contact electromagnet loading method is designed based on problem of complicated structure, serious abrasion, and vibration existing in the contact loading of high speed motorized spindles. In this method, the load of practical cutting forces can be simulated by using dynamic electromagnetic force, and the dynamic non-contact loading is realized. The model of non-contact electromagnetic loading is established using electromagnetic theory, and the influencing factors of the electromagnetic force are analyzed. The key technology of electromagnetic loading is solved, and the integrated experiment is designed. Under the conditions of 9 000 r/min rotational speed and 40 mA excitation current, the dynamic loading experiment is carried out for a 170MD18Y16 grinding motorized spindle. The theoretical value is compared with the measured value of the dynamic electromagnetic force in various excitation currents and rotational speeds. The result indicates that changes are consistent, and errors between the theoretical value and measurement value of dynamic loading are small. The experimental results have verified the validity of the dynamic non-contact electromagnetic loading method, and loading under different conditions can be accomplished by changing the excitation current and rotational speed.