| 摘要 |
PROBLEM TO BE SOLVED: To provide an electromagnetic suspension control system in which a satisfactory damping force characteristic can be secured. SOLUTION: When an input voltage (an induced voltage of an electromagnetic damper 6) to a booster circuit 11 and, by extension, a stroke velocity are high, a duty ratio of switching of FET 18 is so determined for a damping force to be constant and FET 18 is switched in response to the determined duty ratio to obtain the damping force. Even when the stoke velocity of the electromagnetic damper is large, the generating damping force can be restrained below the constant value, to develop into a state of over damping is restrained, and the satisfactory damping force characteristic can be attained. In addition, by changing the duty ratio, an electric current run in the circuit can be regulated, the damping force characteristic can be changed over wider range, and, by extension, versatility can be advanced. With an electric current in the circuit being reduced by adjustment, heat generation of the circuit can be restrained and over heating can be prevented.
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