永磁轴承最小悬浮转速与转动惯量的关系研究

为研究永磁悬浮旋转体实现稳定平衡的最小转速与转动惯量的关系,设计了一种新型永磁轴承透平机,在同一定子内安装3个结构和尺寸相同但转动惯量不同的转子。测量3个转子的转动惯量,并用均匀分布在透平机定子外部的4个霍尔传感器测量转子偏心距。实验结果表明,当转速超过某一临界值时,陀螺效应使得永磁悬浮透平机转子维持稳定的悬浮,并且最小悬浮转速与转动惯量负相关,即转动惯量越大的转子悬浮需要的转速越小。

Relations between Novel PMB＇s Minimal Speed for Suspension and Its Inertia

To analyze the relations between the minimal speed of permanent maglev rotator with its rotating inertia,one novel permanent maglev turbine model was designed:one stator and three rotors which had the same size but different rotational inertias.The three rotors’ rotational inertias were measured,and four Hall sensors distributed evenly at the turbine’s stator were used to measure the rotor’s eccentricity.The results demonstrate that the rotors of the permanent maglev turbine can maintain stable suspension by gyroscopic effect when the speed is higher than a critical point.And the minimal speed for suspension has a negative correlation with the rotor’s rotational inertia,namely,the bigger the inertia of the rotor,the smaller the required speed for suspension.