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. 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。