2020 年 28 巻 2 号 p. 94-100
An AC magnetic suspension system operated differentially has been designed and developed to investigate the characteristics of AC magnetic suspension using magnetic resonance coupling. This device enables the floator to keep a constant position despite changing the parameters of the stator electromagnets by differential operation. A permanent magnet is incorporated in this system to minimize the required power supplied to the stator electromagnets. Magnetic suspension with a maximum gap of 3.4 mm or a minimum gap of 2.0 mm is achieved. Indirect damping is applied using VCM to make the system dynamically stable. The frequency response analyses the relation between the stiffness and the floating position and the effects of indirect damping on the suspension characteristics. The effect of the amplitude of the applied voltage and the applied frequency is estimated experimentally during the stable suspension in the differential operation.
