基于ANSYS的悬挂励磁机转子结构可靠性分析

Reliability Analysis of Suspended Exciter Rotor Structure with ANSYS

为保证悬挂式励磁机的可靠性,运用ANSYS对转子挠度、扭转强度、联轴螺栓的强度和槽楔应力分布进行仿真计算,结果表明:静止状态下,套在发电机轴时励磁机转子铁芯挠度不影响励磁机气隙均匀分布;短路时,联轴螺栓的剪切和转轴的局部应力集中情况良好;转子联轴螺栓在预紧力和重力下的最大应力和交变弯应力幅值合理;额定工况和超速工况下,槽型的变形量和应力分布合理,转子槽楔强度能满足励磁机在额定及超速时安全要求。励磁机转子设计满足励磁机额定运行的机械强度要求。

A reliability analysis of the suspended exciter rotor structure is carried out with ANSYS software, including the deflection and torsional strength of the rotor, the strength of the rotor bolts and the stress distribution of the slot wedge. The results show that the mechanical strength requirements of the exciter rotor under the rated operation condition are satisfied. In static condition, the deflection of the rotor core will not affect the even distribution of the exciter clearance when the iron core is fitted on the shaft. When short circuited, the shear stress of the rotor bolts and the local stress concentration of the shaft are in good conditions. The largest stress and the alternating bending stress of the rotor bolts under the pre-tightening force and the gravity are reasonable. Under the rated operation condition and the over-speed condition, the deformation and stress distribution of the slot are reasonable, and the strength of the slot wedge meets the safety requirement.