| 摘要 |
PROBLEM TO BE SOLVED: To provide a controller for controlling the retraction of a disk conveyed on a movable member operated by an electric motor. SOLUTION: The controller is provided with a measurement circuit having an output including the addition of a measurement circuit offset voltage to a reverse electromotive force (reverse EMF) from an electric motor in measurement phase. The controller further includes an offset removal circuit connected to the output of the measuring circuit. The reverse EMF from the electric motor is output from the output of the offset removal circuit. A driver circuit is connected to the terminal of the electric motor, and supplies a driving current of a size based on the reverse EMF from the electric motor to the electric motor in a driving phase. COPYRIGHT: (C)2006,JPO&NCIPI
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