| 摘要 |
PURPOSE:To float or land a slider without shock by gradually varying the reference position set value of a servo control system at levitating or landing time of the slider. CONSTITUTION:A servo control system 13 controls a power source to be supplied to a control coil 12 of upward and downward control electromagnet 7 in response to the difference between the detected voltage of a position sensor 8 and the set voltage V output from a reference position voltage setter 14. When a switch S is closed, a capacitor C is charged through a resistor R3 to a power source voltage at the constant time constant. Accordingly, a slider 4 is slowly levitated from the landing state to a normal levitation state on the basis of the time constant determined by the size of the capacitor C. When the switch S is opened, the load of the capacitor C is discharged through a resistor R4 and a transistor Tr. As a result, the set voltage V is gradually increased to land the slider 4 on rails 3.
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