哈尔巴赫永磁环阵在无轴承瓣形薄片电机中的应用

Bearingless Segment Slice Motor with Halbach Magnet

磁悬浮转子的拖动系统以其独特的优势,在高转速、长寿命、超密封等驱动领域有广阔的应用前景。由于无轴承薄片电机结构紧凑且只需要三个自由度的悬浮控制,在很多领域具有很高应用价值。通过对传统无轴承瓣形薄片电机的分析,提出利用哈尔巴赫永磁环体取代转子永磁体,并建立数学模型,利用有限元方法对定子单元产生的径向力进行仿真计算,结果表明,由于哈尔巴赫永磁转子结构无需铁芯,使无轴承瓣形薄片电机控制力减至最小,同时减小了转子的转动惯量,提高了电机控制性能和运行平稳性。

Today magnetically levitated rotors are mainly used in applications where wearless operation and high life cycle are of importance.The bearingless slice motor features a very compact design because three degrees of freedom are passively stabilized by reluctance forces.A new bearingless segment motor featuring a Halbach magnet ring mounted on the rotor is introduced.Thus,no back iron is needed on the rotor and therefore the overall weight of the permanent magnet excited disc-shaped rotor is reduced to a minimum.The bearing forces which can be created by one optimized stator segment are calculated analytically.These results allow conclusions for the total force locus.