| 摘要 |
PROBLEM TO BE SOLVED: To provide a controller for controlling the retraction of a device conveyed on a movable member operated by an electric motor after a sudden power failure. SOLUTION: The controller is provided with a measurement circuit for measuring a reverse electromotive force from an electric motor in measurement phase. The controller is further provided with a controller for receiving an actual speed, and supplies a command signal for controlling the size of a driving current based on an instructed speed and the actual speed of a movable member. The controller is yet further provided with a current control loop for supplying a command current signal based on a current supplied to the electric motor and the command signal, and supplying a driving current to the electric motor in a driving phase based on the command current signal. COPYRIGHT: (C)2006,JPO&NCIPI
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