| 摘要 |
PURPOSE:To drive a motor of a conveyor or the like without reducing the productivity by estimating the load state of the conveyor or the like by a position sensor signal or the output current from an inverter device to determine the acceleration/deceleration time. CONSTITUTION:A signal input terminal 14 to which signals from two position sensors 3 and 4 can be inputted, a time difference detecting means 15 which detects the time difference between output signals of sensors 3 and 4, and an operating means 16 which estimates the load weight of the conveyor or the like by the time difference to operate the acceleration/ deceleration time are provided. In this case, signals from two positions sensors 3 and 4 are inputted to an inverter device 7, and the speed of the conveyor or the like is operated by the time difference between two signals to estimate the load weight, and the acceleration/ deceleration time required for stop at a home position or the like is operated, and the motor is decelerated and stopped in accordance with this operated time. Thus, it is unnecessary to operate the motor at a low uniform speed once in the same manner as a conventional inverter device though the conveyor or the like is stopped at the home position, and the deceleration time is operated in accordance with the load weight of the conveyor or the like, and the motor is decelerated and stopped in accordance with this time; and therefore, the conveyor is stopped at the home position in a short time to improve the productivity. |
