TORQUE ABNORMALITY MONITORING METHOD FOR MOTOR AND ABNORMALITY PROCESSING METHOD THEREFOR

摘要

PROBLEM TO BE SOLVED: To perform the proper abnormality processing by deciding the torque abnormality when the torque of a motor exceeds its threshold previously decided based on the torque value that is measured in a normal mode and in every operation control process of the motor. SOLUTION: The moving up-don positions of a suction pipe 3 are continuously measured based on the measurement signal of a revolution detector 9 and the effective diameter of a sprocket wheel 8. Then the start/stop operations and a revolution speed control command of a motor 10 are outputted to a speed controller 11 based on the moving up-down position information on the pipe 3 and a sequence control program. The torque value of the motor 10 which are continuously measured by a torque measurement device 12 are compared with the threshold of every process that is previously decided based on the torque value measured in a normal mode of the motor 10. Then the torque abnormality is decided when the measured torque value exceeds its threshold, and an abnormality alarm is outputted. Thus, the proper abnormality processing can be carried out for the torque of the motor 10.