无轴承永磁同步电机电磁特性仿真研究  

Simulation Study of Electromagnetic Characteristics of Bearingless Permanent Magnet Synchronous Motor

作　　者：孙丽兵 王金玉 李肖艳 SUN Libing;WANG Jinyu;LI Xiaoyan(School of Mechanical and Energy Engineering,Shanghai Technical Institute of Electronics&Information,Shanghai 201411,China;Shanghai Engineering Research Center of Motor System Energy Saving Co.,Ltd.,Shanghai 200063,China;Shanghai Shipbuilding Technology Research Institute,Shanghai 200030,China)

机构地区：[1]上海电子信息职业技术学院机械与能源工程学院,上海201411 [2]上海电机系统节能工程技术研究中心有限公司,上海200063 [3]上海船舶工艺研究所,上海200030

出　　处：《电机与控制应用》2022年第5期69-74,109,共7页Electric machines & control application

摘　　要：系统阐述了无轴承永磁同步电机的基本原理和工作特性,分析了转子永磁体、牵引电流激励、悬浮电流激励相互耦合激励下输出牵引转矩、x轴及y轴悬浮力随初始角度的变化特性曲线,研究了x轴及y轴方向不同偏心距下单边磁拉力的变化规律,并通过有限元仿真进行验证。结果表明:y轴方向偏心后会造成y轴方向的单边磁拉力周期平均值增加,以及x轴、y轴方向的动态振幅波动值的增加。随着y轴方向偏心距离的增加,y轴方向偏移的单边磁拉力平均值及振幅呈线性增加趋势,x轴方向偏移的单边磁拉力平均值近似为0,振幅呈线性增加趋势。转子永磁体、牵引及悬浮绕组电流共同耦合激励将产生旋转牵引力、x轴及y轴方向悬浮力,只要针对x、y轴所处位置所产生的悬浮力进行反向补偿,使电机转子在x、y轴方向的合成作用力为0,就可以保证电机旋转过程中转子在不偏心状态下运行。The basic principle and working characteristics of bearingless permanent magnet synchronous motor are expounded systematically. The variation characteristic curves of output traction torque, x-axis and y-axis levitation force with initial angle under the coupling excitation of rotor permanent magnet, traction current excitation and levitation current excitation are analyzed. The variation law of unilateral magnetic tension under different eccentricity in x-axis and y-axis directions is studied and verified by finite element simulation. The results show that the eccentricity of y-axis direction will increase the periodic average value of unilateral magnetic tension in the y-axis direction and the dynamic amplitude fluctuation in both x-axis and y-axis directions. With the increase of the eccentric distance in the y-axis direction, the average value and amplitude of the unilateral magnetic tension in the y-axis direction increase linearly, while the average value of the unilateral magnetic tension in the x-axis direction is approximately 0, and the amplitude increases linearly. The coupling excitation of rotor permanent magnet, traction and levitation winding current will produce rotating traction force and x-axis and y-axis levitation force. As long as the levitation force generated by the position of x-axis and y-axis is compensated in reverse, so that the combined force of the motor rotor in the directions of x-axis and y-axis is 0, the rotor can operate in a non-eccentric state during the rotation of the motor.

关 键 词：无轴承永磁同步电机 牵引电流激励 悬浮电流激励 电磁特性 转子偏心 

分 类 号：TM351[电气工程—电机]