Electromagnetic vibration suppression device and electromagnetic vibration suppression control program

An electromagnetic vibration suppression device for suppressing vibration of a traveling steel sheet, comprising:

• a plurality of electromagnet pairs disposed in a width direction of a steel sheet, each electromagnet pair including a combination of electromagnets oppositely disposed to each other in a thickness direction of the steel sheet traveling in a predetermined direction,
• a plurality of sensor pairs, each sensor detecting a distance to the steel sheet, and each sensor disposed on each of the electromagnets to face the steel sheet, and each sensor pair disposed at an opposing location to interpose the steel sheet between two sensors in pair;
• and
• a control section adapted to control current to be applied to each electromagnet to suppress vibration of the steel sheet traveling between electromagnets of each of the electromagnet pairs, wherein
• the control section comprises edge position calculation means and current amount control means,
• the edge position calculation means is adapted to determine an edge position of the steel sheet by computation by a formula of ½ W±α, in which W is an inputted width dimension of the steel sheet from an external of the electromagnetic vibration suppression device, and α is a displacement amount in a width direction of the steel sheet, the displacement amount being inputted in real time or at predetermined time intervals from an external of the electromagnetic vibration suppression device,
• the current amount control means is adapted to separately control a current amount to be applied to the electromagnets based on the edge position of the steel sheet determined by the edge position calculation means,
• among said plurality of electromagnet pairs, the current amount control means detects an edge-position detecting electromagnet pair in which the edge position is disposed therebetween, the edge position obtained by the formula above in the edge position calculation means, and then, a driving condition is made on the electromagnets making up the electromagnet pairs located at a side closer to a widthwise center than the edge-position detecting electromagnet pair, while a non-driving condition is made on other electromagnets located at a side closer to the widthwise end than the edge-position detecting electromagnet pair.