CURRENT COMPENSATING METHOD FOR SUPPRESSING ECCENTRIC EFFECT OF GANTRY FOR COMPUTERIZED TOMOGRAPHY EQUIPMENT

摘要

PURPOSE: A current compensating method is provided to reduce a speed ripple by converting the estimated load torque component into a compensating current and adding the compensating current to a driving current component. CONSTITUTION: A current compensating method comprises a step of estimating, in a real time basis, the eccentric load torque which gives influences to a speed ripple so as to the remove the speed ripple generated from the eccentric load, by applying an eccentric load torque estimator and a torque-current converter to the vector control algorithm of a permanent synchronous motor adopting the maximum torque control system per unit current; and a step of converting the estimated eccentric load torque component into a compensating current of sine wave, and adding the compensating current to a driving current component.