Suspension characteristics of differentially operated AC magnetic suspension system using magnetic resonant coupling

摘要

An AC magnetic suspension system operating in the differential mode 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 operating in the differential mode. 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 2.0 mm is achieved. Indirect damping using PD control is applied to make the system dynamically stable. The frequency response analyses show the relations between the stiffness and the floating position and effects of damping on the suspension characteristics. The effect of the amplitude of the applied voltage and the applied frequency is estimated during suspension in the differential mode.