| 摘要 |
PURPOSE: To surely prevent out-of-step without decreasing advantages of a stepping motor. CONSTITUTION: A revolutional speed sensor 2 for detecting a position in forward-revolutional direction is mounted at the shaft of a stepping motor 1. A control circuit 5 for controlling a driving circuit 4 is provided in a place between a controller and the driving circuit 4 in a way that a positional deviation between a position detected by the revolutional speed sensor 2 and a command position based on a command pulse from a controller 3 is limited under control in a stable region necessary for synchronous rotation of the stepping motor 1. |
