火箭推进

针对电机转子中硅钢片叠压及拉杆-叶轮的特殊结构形式,借助有限元方法对硅钢片装配过程进行仿真,获得硅钢片叠压结构横向弯曲刚度随硅钢片离散数目的变化规律,通过曲线拟合外推得到实际硅钢片叠压结构横向弯曲刚度; 根据叶轮与转轴对接面的大小,对叶轮进行分割。以质量和刚度等效为原则,实现了硅钢片叠压结构和拉杆-叶轮结构的简化建模,并通过转子部件及整体的自由模态试验对简化分析模型进行了验证。最后通过转子的运转试验对前两阶临界转速的仿真结果进行了验证,前两阶临界转速的仿真结果与试验误差小于3.1%。

According to the special structure of silicon steel sheet lamination(SSSL)and nutted rod-impeller(NRI)in the motor rotor, the finite element method was used to simulate the assembly process of SSSL.The regularity that the lateral bending stiffness varying with the discrete number of the whole silicon steel sheet structure was explored, and the lateral bending stiffness of SSSL was achieved by curve fitting and extrapolating.The impeller was also divided according to their interface size.Based on the principle of mass and stiffness equivalent, the simplified models of SSSL structure and NRI structure were achieved, and the simplified analysis model was verified through the free modal test of rotor components and whole structure.Finally, the simulation results of the first two critical speeds were verified by the rotor running test, and the deviation between the experimental and the simulation results was less than 3.1%.

引言
1 永磁电机转子结构
2 电机转子模型
3 临界转速分析
4 结论

图1 永磁电机转子结构示意图<br/>Fig.1 Rotor structure diagram of the permanent magnet motor

图1 永磁电机转子结构示意图
Fig.1 Rotor structure diagram of the permanent magnet motor

图2 硅钢片叠压结构<br/>Fig.2 Structure of silicon steel sheet lamination

图2 硅钢片叠压结构
Fig.2 Structure of silicon steel sheet lamination

图3 加载过程
Fig.3 Loading procedure

图4 硅钢片叠压结构弯曲刚度与硅钢片整体离散数目关系曲线<br/>Fig.4 Relationship between bending stiffnessand whole discrete number for SSSL structure

图4 硅钢片叠压结构弯曲刚度与硅钢片整体离散数目关系曲线
Fig.4 Relationship between bending stiffnessand whole discrete number for SSSL structure

图5 转轴自由模态试验<br/>Fig.5 Free modal test of rotor shaft of motor

图5 转轴自由模态试验
Fig.5 Free modal test of rotor shaft of motor

表1 转轴自由模态频率仿真与试验结果比较<br/>Tab.1 Comparison between simulation and experimental results of free modal frequency of rotor shaft Hz

表1 转轴自由模态频率仿真与试验结果比较
Tab.1 Comparison between simulation and experimental results of free modal frequency of rotor shaft Hz

图6 拉杆-叶轮结构简化<br/>Fig.6 Simplified structure of nutted-rod impeller

图6 拉杆-叶轮结构简化
Fig.6 Simplified structure of nutted-rod impeller

图7 转子自由模态试验<br/>Fig.7 Rotor free modal test

图7 转子自由模态试验
Fig.7 Rotor free modal test

表2 转子自由模态频率仿真与试验结果比较<br/>Tab.2 Comparison between simulation and experimental results of rotor free modal frequency Hz

表2 转子自由模态频率仿真与试验结果比较
Tab.2 Comparison between simulation and experimental results of rotor free modal frequency Hz

图8 转子轴承支承刚度随转速变化曲线<br/>Fig.8 Variation curve of rotor bearing support stiffness with rotating speed

图8 转子轴承支承刚度随转速变化曲线
Fig.8 Variation curve of rotor bearing support stiffness with rotating speed

图9 Campbell图
Fig.9 Campbell diagram

图10 转子试验状态示意图<br/>Fig.10 Diagram of rotor test state

图10 转子试验状态示意图
Fig.10 Diagram of rotor test state

图11 升速过程中转子振动位移1X分量变化曲线<br/>Fig.11 Variation curve of 1X component of vibrationdisplacement duringacceleration process

图11 升速过程中转子振动位移1X分量变化曲线
Fig.11 Variation curve of 1X component of vibrationdisplacement duringacceleration process

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备注

引言

1 永磁电机转子结构

2 电机转子模型

3 临界转速分析

4 结论

期刊信息