G-D system with current cutoff for excavator drive

Abstract

The decisive requirement for the drive of single-bucket excavators is the creation of the optimal form of mechanical characteristic. Nowadays for excavators with bucket capacity 3-5 m³ the system of three-winding generator-motor TG-D has found application. The generator, having three excitation windings, creates a falling “excavator” characteristic. The drive is controlled by changing the current of the set winding 1. Negative one-stage current coupling - winding 3 - determines the falling form of the mechanical characteristic under overloads. Positive voltage coupling - winding 2 - provides high fill factor (0,7-0,8).