Analysis On Speed-control Characteristics Of Variable Speed Pump-control-motor System Based On AMESim

Variable speed hydraulic technology as a new type of energy saving transmission technology have been widely used in many areas, but in practice, the scope of application is limited by disadvantages of the system, such as slow response, poor control characteristics and so on. Understanding of variable speed pump-control-motor speed control system characteristics and laws are an important theoretical basis for the further development of energy-saving variable speed hydraulic drive technology.Characteristics of conventional hydraulic speed control circuit, reseach situation of variable speed hydraulic technology are described. Composition and principle of variable speed pump-control-motor as well as main system components technical specifications and characteristics, simulation software AMESim and PID control principle are introduced. Co-simulation principle and settings of AMESim and MATLAB is briefly described.The transformation of experimental table has been designed. Two reform schemes are proposed, advantages and disadvantages of each plan are analyzed. The original measurement device is replaced by synchronous belt system for measuring real-time motor speed easily. The relevant parts of reformed system are designed and selected.Pump-controlled speed control system, valve-controlled system and complex peed control system simulation models are established in AMESim. Control strategy of complex peed control system is given. Three types of speed control system simulation results are analyzed. Through simulation analysis, we can know that closed-loop PID control system can compensate for speed loss caused by load increase. When the load changes according to certain rules, system has better stability and control precision. Complex speed control system can reduce system oscillation caused by load mutation, and the system back to steady-state with the shortest possible time. When the load changes according to certain rules, fluctuation of motor speed is minimum, system stability and control accuracy has been further improved.AMEsim and Simulink co-simulation model is established, in order to make full use the advantages of two softwares. Controller model of the hydraulic system is built in Simulink. From the simulation results, reflects the superiority of variable speed pump-control-motor complex speed control system in comparison of traditional control structure and method.Figure [73] table [2] reference [66]...