大型感应电机弧偏心挠度计算

doi:10.11985/2019.02.009

摘要/Abstract

摘要：

对于大型感应电机而言,偏心是典型故障之一。由于偏心将导致电机性能变差,研究大型电机的偏心问题具有较大的现实意义。弧偏心主要是由于随着时间变长,材料的弹性模量变小而出现的。导致弧偏心的因素有很多,主要包括转子部件的重力、离心力和不平衡磁拉力(UMP)。挠度的计算基于材料力学中挠曲轴近似微分方程。在此基础上,建立动态UMP计算方程,并考虑了UMP对感应电动机偏心下挠度计算的影响。阐述了弧偏心的形成,并定量比较了转子上承受的三种力。最后计算得出最终的弧线方程。在计算过程中,有限元分析被用于精确计算不平衡磁拉力。

关键词: 感应电机, 弧偏心, 弹性模量, 动态不平衡磁拉力, 挠度计算

Abstract:

For large induction motor, eccentricity problem is one of classical faults. At the same time, eccentricity leads to the degradation of motor’s performance. It’s meaningful to study eccentricity problem of large motor. Curved eccentricity is mostly appeared due to elasticity modulus of the material. However, there are sorts of factors causing curved eccentricity, mainly including gravity of rotor part, centrifugal force and the unbalanced magnetic pull(UMP). The calculation of deflection is based on approximately differential equation of the deflection curve in mechanics of materials. In addition, dynamic UMP calculation is established and UMP will be of no big deal to eccentricity deflection in induction motor according to the calculation below. The formation of curved eccentricity is explained and three kinds of forces carried on rotor quantitatively are compared. Furthermore, the final curve equation is figured out. Among the calculation, finite element analysis is used to calculate UMP force accurately.

Key words: Induction motor, curved eccentricity, elasticity modulus, dynamic UMP, deflection calculation

中图分类号:

TM315

陈蕾. 大型感应电机弧偏心挠度计算[J]. 电气工程学报, 2019, 14(2): 47-54.

CHEN Lei. Deflection Calculation of Curved Eccentricity in Large Induction Motor[J]. Journal of Electrical Engineering, 2019, 14(2): 47-54.

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参数	数值
D_I/mm	220
D_O/mm	346
L₁/mm	1 400
L₂/mm	300
DW600_50/(kg/m³)	7 650
45#钢/(kg/m³)	7 850
E_sss/GPa	195
E_shaft/GPa	80.65
I_shaft/(kg·m²)	74.6
I_sss/(kg·m²)	75