Variable Virtual Spring Ratio and Damping Coefficient Control for Electro-magnetic Suspension with Linear Motor

This paper proposes a linear-actuator-based active-vibration-control method with displacement feedback for an electro-magnetic suspension with a linear motor to reduce sinusoidal disturbance transmissibility. The concept of our proposed method is simple: the thrust force of a linear motor is controlled in proportion to the displacement and velocity of the suspension with gain. The vibration transmission is related to the spring ratio and damping coefficient. Therefore, virtually controlling the spring ratio and damping coefficient can reduce vibration transmission.