| 摘要 |
PURPOSE:To enable to operate a roller on which a material is placed without stalling other rollers by detecting the secondary induced electromotive forces of motors and feeding back the minimum value as the speed feedback amount, thereby bringing the speed of the roller coincidence with a speed reference. CONSTITUTION:A motor terminal voltage V1 is detected by a voltage detector 12, the currents i1 of motors are detected by current detectors 21-2n, a speed feedback amount calculator 11 calculates secondary induced electromotive force E2 of the motors from the terminal voltages V1 and the primary currents i1 of the motors, feeds back the minimum value as the speed feedback amount 5m to control the speed. Thus, the speed of the roller of heavy load placed with the material coincides with the speed reference, and the other roller can operate smoothly without stalling other roller. |
