Positioning device and control method thereof

The invention provides a positioning device capable of performing high-precision positioning control. The positioning device includes an actuator configured from a DC motor (200), a speed reduction mechanism, and a single-phase rotation sensor (20) that detects a rotational displacement amount of the speed reduction mechanism, and an electronic control device (1) that electrically drives the DC motor. The electronic control device (1) learns the time (T2) taken from the power-off to the stop of the motor, and performs deceleration control so as to stop the DC motor (200) with the substantially intermediate position between the rising edge (N + 4f) and the falling edge (N + 4r) of the output pulse of the rotation sensor as the target rotation stop position (MP). 本发明提供一种能够进行高精度的定位控制的定位装置。定位装置包含致动器和电子控制装置(1)，该致动器由直流马达(200)、减速机构以及检测减速机构的旋转位移量的单相式的旋转传感器(20)构成，该电子控制装置(1)对直流马达进行电驱动。电子控制装置(1)学习从马达的电源断开到停止所花费的时间(T2)，将旋转传感器的输出脉冲的上升沿(N+4f)与下降沿(N+4r)的大致中间位置作为目标旋转停止位置(MP)，以使直流马达(200)停止的方式进行减速控制。