JPS577310A - Tension controller - Google Patents

Abstract

PURPOSE: To give a prescribed tension to a rod, by including a tension-to-electric current transducer and a tension controller in a tension controlling apparatus, and by controlling a drooping characteristic constancy regulator with the output of the said tension controller.

CONSTITUTION: A tension reference TREF given by a tension reference setter 19 is transferred by a tension-to-electric current transducer 16 to an electric current IREF in consideration of the roll diameter, electric load current, etc.; the value of electric current reference IREF is compared with the actual electric current I_a whose deviation is then controlled by a proportional-plus-integral controlling action or a proportional controlling action of a tension controller 17; the output D of the tension controller 17 changes the gain of a drooping characteristic constancy regulator 18 which then gives a drooping characteristic to a speed controlling system; hereby, the tension is controlled to the tension reference TREF. If the initial value of the drooping characteristic is taken as an inclined curve (k), the motor current at a motor speed NL becomes I_a. Accordingly, the motor generates a tension equivalent to the electric current I_a. For controlling this tension value to the preset tension reference TREF, the inclined curve (k) is shifted in the arrowed direction A to an inclined curve (k') so as to make the motor current I_a coincide with IREF.

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