| 摘要 |
PURPOSE:To attain stable and highly accurate positioning by providing a magnetic generator energizing a moving piece fitted to a mobile body in forward/ backward direction. CONSTITUTION:Cores 10, 11 wound with exciting coils 13, 14 in a positioning device are arranged symmetrically from a reference point G0 on floor at the stop position of a pallet 3 along the moving direction. Moreover, projected parts 15a-15c of a moving core 15 of nearly E form are mounted to the lower face of the pallet 3 downward and a rectangular member 20 is fitted to the back side. A reflecting plate 21 is fitted to the member 20 and a reflection type photosensor 22 (22a, 22b) is fixed to the floor via the supporting stand 23 opposite thereto so as to constitute a linear encoder. The phase of the sensor 22 is compared by a discriminating circuit so as to discriminate the moving direction of the pallet, the reference value is subtracted therefrom so as to excite the coils 13, 14. Furthermore, the reference value is the same value as the count value obtained when the reference point P0 is opposed to the reference point of the floor. |
