Digital direct-current speed regulating system of electric excavator

Abstract

The invention discloses a digital direct-current speed regulating system of an electric excavator. The system is mainly characterized by comprising a controller, a synchronous circuit, a protective circuit, detection circuits and a rectification device. The detection circuits include a speed detection circuit and a current detection circuit. The controller is connected with the synchronous circuit, the protective circuit is connected with the controller, the detection circuits are connected with the controller, and the controller is connected with the rectification device. A pulse encoder is adopted in the speed detection circuit, a Hall sensor is adopted in the current detection circuit, and a TMS320LF2407A controller serves as the controller. By means of the TMS320LF2407A controller, a positive and negative full-controlled bridge main loop composed of high-power thyristors is driven, and a rotation speed feedback signal and a current feedback signal in a control loop have access to the controller. By means of rich functions of software in the controller, comprehensive feedback of rotation speed and current is achieved through programming. The system has the advantages of being low in price, good in speed adjusting performance, convenient to maintain, obvious in energy conservation and the like.

Description

technical field [0001] The invention belongs to the technical field of speed regulation systems of electric excavators, in particular to a digital direct current speed regulation system of electric excavators. Background technique [0002] Electric excavators are large-scale automated equipment used to mine ores and hard rocks in my country's mines, cement industry and water conservancy construction open-air construction sites. At present, the speed control part of mine electric excavators in my country basically adopts F-D DC motor speed control transmission system. However, the F-D DC motor speed control system has defects such as complex structure, high operating cost, and high noise. The main performances are as follows: 1. Since the magnetic amplifier and magnetic trigger use the principle of magnetic flux saturation to realize small current control and large current, Compared with the constantly innovative high-power thyristor components, its technology is very backwa...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a digital DC speed control system for electric excavators in view of the disadvantages of traditional excavating motor systems such as backward technology, high failure, low dynamic efficiency, and high energy consumption. The system uses TMS320LF2407A controller to drive high-power thyristors. The main circuit of the positive and negative full control bridge, in the control loop, the speed feedback and current feedback signals are connected to the TMS320LF2407A controller, and the comprehensive software functions of the TMS320LF2407A controller are used to program the comprehensive feedback of the speed and current; the device has a low price , good speed regulation performance, convenient maintenance and remarkable energy saving

Images