AC Electric Drive for Opening the Bottom of an Excavator Bucket

Abstract

This article considers the design output and commercial operation of a new ac electric drive for opening the bottom of the excavator bucket. The electric drive is made according to the voltage inverter— induction motor arrangement with the main torque feedback. A three-phase induction motor is based on transvector control with field orientation and an adaptive observer based on the Kalman filter. A pulse transducer is used to measure the rate of rotation. The observer calculates the flux linkage, torque, and current components from the measured phase currents and motor voltages and rotation. When the drive is switched on, the mode setting controller generates torque and flux setting signals corresponding to the operation of the device when the trip rope is pulled up. In this case, the trip rope is wound on the drum when pulling up or unwound when the dipper stick is unfold. When the driver turns on the control button, the drive mode-setting controller sends signals corresponding to the torque and flux linkage when the locking bar is pulled out. After the locking bar is pulled out, a signal is generated that sets drive task signals corresponding to the trip rope pulling mode. The main design solutions for choosing the drive motor for opening the bucket bottom are presented. The electric drive is used on an EKG-12K excavator at the Mikhailovskii mining and processing plant.