Method for realizing upper and lower roller load balance control based on 6RA80 direct current speed regulator

Abstract

The invention discloses a method for realizing upper and lower roller load balance control based on a 6RA80 direct current speed regulator. The steps include: first starting upper and lower roller motors, recording armature current I<up> and I<down>, and calculating an absolute value of a current difference value |[delta]I|; then judging whether |[delta]I| is larger than 3%*I<up>; if yes, calculating a fine adjustment quantity [delta]n of additional given speed, and otherwise making no adjustment; then judging whether [delta]I in |[delta]I| is larger than 0, if yes, subtracting additional given speed from a given value of the speed of an upper roller to obtain a rotating speed value n<up> of the upper roller motor, and otherwise subtracting additional given speed from a given value of the speed of a lower roller to obtain a rotating speed value n<down> of the lower roller motor; and finally, judging whether an absolute value of a rotating speed difference value |n<up>-n<down>| of the upper and lower roller motors is larger than 1%*|n<up><*>|, if yes, decelerating and replacing with a new pair of upper and lower rollers, and otherwise outputting torque according to the rotating speed values n<up> and n<down> of the upper and lower roller motors, thereby realizing an upper and lower roller load balance. The method provided by the invention has the advantages of effectively controlling the output torque of the upper and lower rollers, and guaranteeing that a rolling torque load is equally distributed on the upper and lower working rollers.

Description

technical field [0001] The invention belongs to the field of metallurgical automation control, in particular to a method for realizing load balance control of upper and lower rollers based on a 6RA80 DC governor. Background technique [0002] When rolling with a large reduction, the output power of the drive motor is required to be relatively large. In order to reduce the load on the drive shaft of the motor, the upper and lower work rolls are driven separately, and because the drive torque of the motor shaft is relatively large, the general system design uses a DC motor. However, due to the limitation of commutation and other problems, it is impossible to increase the capacity of the DC machine. Therefore, in practical applications, in order to meet the power requirements of rolling, two motors are designed to drive two work rolls respectively. transfer method. [0003] Such a mechanical transmission method puts forward higher requirements for the control system of the upp...

AI Technical Summary

Problems solved by technology

[0007] In order to solve the problem of unbalanced load on the upper and lower rollers caused by the incomplete synchronization of the actual speed of the upper and lower rollers in the prior art, the present invention proposes a load balance control method for the upper and lower rollers based on a 6RA80 DC governor

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