The Theories Of The New-type Electric Transmission In The Application Of The ExcavatorControl Systems

The dissertation mostly discourses upon the theories of the new-type electric transmission in the application of the control stystem for excavators. This system uses the total digital direct current drivers to replace the former AC-DC dynamo of the excavator. According to the problem of the powder dirt, the high temperature and the aquosity being the open country busywork, adopt the combination of the total digital DC timing and the programmable controller to tap the intelligent PLC control technology of the contemporary advanced level, and boost the timing capability in a position to the high precise timing and control in very wide extension, and take some control rules and measures which are difficult to come true by the analogy circuit, such as the electrical current self-adaptive control, the self-study optimizing control and so on. Using the software of the control arithmetic replaces the inner hardware. By all the signal of the control and manipulation entering the PLC to reduce the interspace tache, enhance the anti-jamming ability, improve the electric performance and the spot entironment, great reduce the failure rate and improve the efficiency of using equipments.According to the loops of the total digital DC timing and applied self-adaptive principles, deduce the mathematic model of the speed, armature voltage and armature electrical current loops. In terms of the excavator principles of its control mode introducing the electrical current self-adaptive control, the parameters are carried through the self- study optimal control systems.The dissertation is consisted of the five parts: the first part is the summary, which narrates the defect of the former excavator control system and the basic theories of the electric transmission. The second part introduces the continous and discrete systemic model references and the stability theories. The third part is the new systemic collocating theories and intelligent PID control. The fourth part narrates the embodying operation and the realization of the new systemic collocating. The fifth part is the operation of the parameters and the buildup of the software. By the demonstration of the total dissertation, we expounded the intelligent electric transmission in the applications of the control fields.