抄録
A Magnetic Bearing Wheel (MBW) with inclined magnetic poles has been developed, which allows the fabrication of a 5-DOF active magnetic bearing with six electromagnets and six displacement sensors, leading to a reduction in the size and weight of the MBW system. The MBW controller consists of two modules: a magnetic bearing controller, which controls the rotor displacements by PI-D control, and a disturbance feedback controller, which reduces the MBW disturbance. A design of the magnetic bearing controller is based on the geometric analysis of the electromagnetic forces and magnetic bearing forces/moments. The magnetic bearing controller utilizes the redundancy of electromagnetic forces in order to satisfy certain restrictions on the magnetically suspended system and to optimize the electromagnetic forces used for biasing. On the other hand, the disturbance feedback controller generates rotor displacement commands that are capable of ensuring a reduction in the MBW disturbance. The magnetic bearing control system with the disturbance feedback controller has extremely good stability as the stability can be controlled by applying an appropriate phase lead to the displacement commands. Our control system enables tP,e reduction in the MBW disturbance to 0.1 Nrms/0.05 Nmrms or less for all rotor speeds up to 6000 rpm.
