一种新型的五自由度磁悬浮电机

Innovative Motor with Five-Degree Magnetic Suspension

介绍了一种新型的五自由度磁悬浮电机系统 ,它由两自由度无轴承电机和三自由度磁轴承两个独立悬浮单元构成。其中无轴承电机将悬浮绕组与转矩绕组叠绕在一起 ,同时实现转矩驱动和转子两自由度径向悬浮 ;三自由度磁轴承利用单极永磁偏置磁场实现转子轴向悬浮以及两自由度径向悬浮。该电机结构紧凑 ,有利于向大功率、高转速方向发展。文中介绍了悬浮力产生的基本原理 ,简要推导了系统数学模型 ,给出了控制系统框图。最后对实验样机转子在五个自由度上的悬浮情况以及绕组电流变化进行了测量和分析。实验结果验证了所述原理和控制方案的正确性。

An innovative motor is constructed with two independent suspension units: the two-degree bearingless motor unit and the three-degree magnetic bearing unit. The former combines radial magnetic bearing with a motor magnetically to realize driving torque as well as two radial degree magnetic suspension, and the latter utilizes electromagnets together with a homopolar, permanent magnet bias topology to support the shaft in two radial degrees and one axial degree. The compactness of suspended motors suggests the possibility of high power and high rotational speed motors. The principles of the suspended force production and the mathematical model of the system are introduced, and the currents of the radial and axial force windings as well as radial and axial force are mathematically derived. The control system configuration is shown and the current waveforms and displacements are measured. Experimental results show the validity of the methodology and the control method.