核反应堆控制棒驱动机构电机磁偏特性分析研究

核电厂反应堆的控制棒驱动机构（CRDM）采用同步电机作为机电能量转换的关键部件，电机的单边径向磁拉力会导致电机转子轴系变形，并加剧轴承的磨损，对CRDM寿命和核反应堆运行可靠性产生重要影响。本文分析了CRDM电机径向静偏心、径向动偏心、倾斜偏心的机理，并建立了径向磁拉力、轴向磁拉力计算的数学模型，分析获得了径向磁拉力、轴向磁拉力的变化规律以及与偏心量的关系，结果表明CRDM电机的径向磁拉力相对轴向磁拉力显著较大，并且与转子中心偏心量呈线性正比关系，与转子两端最多倾斜偏心量呈非线性正比关系，所得结论能够为CRDM电机优化改进和轴系结构设计提供指导和依据。 

Analysis and Research on Magnetic and Eccentric Characteristics of CRDM Motor

Control Rod Drive Mechanism (CRDM) of the nuclear power plant reactor uses synchronous motor as the key component for electromechanical energy conversion. The unilateral radial magnetic pull of the motor would lead to deformation of motor shaft system and aggravate the bearing wear, which has an important influence on the life of CRDM and the reliability of nuclear reactor operation. In this paper, the mechanism of radial static eccentricity, radial dynamic eccentricity and inclined eccentricity of CRDM motor is analyzed, and the mathematical models for calculating radial and axial magnetic pull are established. The variation rules of radial and axial magnetic pull and their relationship with eccentricity are obtained. The result shows that radial magnetic pull is significantly larger than axial magnetic force for CRDM motor, and is linearly proportional to the eccentricity of the rotor center and nonlinearly proportional to the maximum tilt eccentricity at both ends of the rotor. The conclusion can provide guidance and basis for the optimization and improvement of CRDM motor and shaft system structure design.