STATIC INERTIA COMPENSATION FUNCTION GENERATOR

摘要

This disclosure relates to a static inertia compensation function generator for use in a constant tension control system for a d.c. drive motor operating to wind or unwind a reel of material. A first generator develops a signal D which is a function of the normalized instantaneous diameter of the reel. A second generator receives the signal D and generates a signal - alpha 1K1D2 which is a function of the square of the normalized instantaneous diameter, alpha 1 and K1 being constants. An inverter also receives the D signal and delivers an inverted normalized instantaneous diameter signal -D. A third generator receives the inverted signal -D and develops a signal, 1/D2 which is a function of the normalized instantaneous diameter squared. A summation amplifier receives the two signals: - alpha 1K1D2 and 1/D2 and delivers an amplified inertia compensation signal Iac = alpha 2( alpha 1K1D2 + [1/D2] where alpha 2 is the gain of the amplifier. The inertia compensation signal Iac is additive or subtractive from a current reference I and is used for accelerating or decelerating the d.c. motor for the purpose of maintaining constant tension on the material under dynamically varying load conditions.