| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a position control device capable of highly accurately detecting the position of a movable member by a simple configuration and capable of highly accurately controlling the stop position. <P>SOLUTION: The device includes: direct-current electric motors 39-42; a transfer means 2 for transferring a movable member by an electric motor; a pulse detection unit 38 for outputting a ripple pulse, which is a ripple component generated in the supply current to the electric motors due to disconnection between a brush and a commutator, extracted and made into a pulse; a present position storage unit 44 for calculating and storing the present position information indicating the present position of the movable member when it is transferred, on the basis of the ripple pulse; and a current controller 45 for decreasing the current to stop the movable member before the current supplied to the electric motors 39-42 is reduced to zero. <P>COPYRIGHT: (C)2012,JPO&INPIT</p> |
