Analysis and Suppression of Leakage Current in Multi Drive Systems Based on Bus Synchronization
The large amount of leakage current in the multi-drive system will be an important factor affect-ing the long-term operation of NC machining equipment.In this paper,an adjacent cancellation suppression measure is proposed,which can effectively reduce the generation of leakage current in the multi-drive sys-tem,thus avoiding the frequent triggering of leakage protection.This measure reverses the common-mode voltage vector direction of two adjacent drive units in space through modulation strategy,so that the high-frequency common-mode voltage components of the two drive units cancel each other,so as to achieve the purpose of suppressing the leakage current of multiple drive systems.The main innovation of this paper is to use a software control method to suppress the leakage current of the multi-drive system.This measure not only effectively suppresses the leakage current,but also achieves low cost.The results of the actual testing platform indicate that the adjacent cancellation suppression measures can effectively reduce the leakage cur-rent by 70%to 80%in multi drive systems,ensuring the stable operation of the multi-drive system.