电机不平衡磁拉力及其刚度的计算_姜培.pdfVIP

32 电机不平衡磁拉力及其刚度的 算 1998. l 4 Calculation of the Unbalanced Magnetic Pul l and Its Stiffness in a Generator 姜培林 虞烈 ( 西安交通大学) Jiang Peilin Yu Lie ( Xi. an Jiaotong University) 给出了作为影响电机轴系动力特性的主要因素之一的不平衡磁拉力及其刚度的 算方法。采用保角 变换简化边界条件得到了磁势的解析表达式, 进而对磁密进行积分得到了非线性磁拉力及其刚度的解析表 达式。本文的结果可以作为电机轴系动力特性分析及设 的理论基础。 电机 不平衡磁拉力 刚度 Abstract The calculation method of the unbalanced magnetic pull and its stiffness w hich are the ey factors influencing the dynamic characteristics of generator rotors is proposed in this paper. T he conformal transformation is used to simplify the boundary condition and the analytic expres- sion for the magnetic potential is obtained. T he analytic expressions for the unbalanced magnetic pull and its stiffness are then obtained from the integration of the magnetic flux density. The re- sult can provide the basis for the dynamic analysis and design of generator shafts. Keywords generator unbalanced magnetic pull stiffness 电机中定子与转子之间的不均匀气隙导致两者之 Ksh u x = ( 1) 间产生不均衡的磁拉力。即使在定、转子表面极其规 chu - cosv 则的情况下, 实际机组中由于轴系的变形引起的电机 y = - Ksinv (2) ch u - cosv 转子的偏心也可以产生不平衡磁拉力。另一方面, 无 其中, l 为由R 、R 和e 决定的常数, 1 0 论转子与定子同心还是转子偏心时, 磁力所给