静态密封双定子高温超导电机电磁噪声预测研究

Vibroacoustic Prediction of High-Temperature Superconducting Dual-Stator Generator with Stationary Seal

基于电磁场-结构场-声场的多物理场耦合分析对静态密封双定子高温超导电机(HTS-DSG)的电磁振动声学规律进行了预测性研究。针对HTS-DSG内定子齿饱和的特点,采用等效气隙长度和动态磁导率相结合的方法,分别对HTS-DSG饱和状态下的内、外气隙磁通密度进行了解析计算,并经仿真及试验验证了理论方法的正确性。针对超导电机内设置分体式冷却杜瓦这一特殊结构,并进行分析得到了不同位置杜瓦的振动规律。结果表明,超导线圈匝层间最大抗拉强度远远大于所受振动应力,超导线圈不会因整机振动发生故障。最后,将电磁力耦合到HTS-DSG声场有限元模型中,利用多物理场耦合分析,预测了HTS-DSG的电磁振动和噪声规律。

Based on the multi-physics field coupling analysis of electromagnetic field,structural field and acoustic field,a predictive study of the electromagnetic vibroacoustic laws of high-temperature superconducting dual-stator generator(HTS-DSG)with stationary seal is carried out.According to the characteristics of stator tooth saturation in HTS-DSG,the method of combining equivalent air gap length and dynamic magnetic permeability is used to analyze and calculate the magnetic flux densities of the inner and outer air gaps in the saturated state of HTS-DSG respectively.Meanwhile,the correctness of the theoretical method is verified by the simulation and experiment.Aiming at the special structure of the split cooling Dewar in the superconducting generator,the vibration stress analysis of the Dewar at different positions is carried out,and the vibration laws of the Dewar at different positions is obtained.The maximum tensile strength is far greater than the vibration stress,that is,under the normal operation state of the motor,the superconducting coil will not fail due to the vibration of the whole machine.Finally,the electromagnetic force is coupled to the HTS-DSG sound field finite element model,and the electromagnetic vibration and noise laws of HTS-DSG are predicted by using multi-physics field coupling analysis.