| The development of automation from the beginning to now has two hundred years history.From the cylinder to the hydraulic cylinder and to electric cylinder today, this represented the improvement of automation levels. Compared with the cylinder and a hydraulic cylinder,electric cylinder is widely used in military, medical and even aspects of family life due to having high precision control, simple structure, and it is easy to maintain. Currently domestic electric cylinder is only at the assembly process and few studies on the Micro electric cylinder.Micro electric cylinder is different from a large electrical cylinder; there is no specific controller and needs to be further designed. The mainly control strategies are common single-chip microcomputer control just like the 51AVR/PIC, DSP control, PLC control and PC+ motion control card control. These control strategies have various disadvantages which lead to unsatisfactory control and less available.Accordingly, a new control scheme based on ARM architecture is proposed in this paper can combine the advantages of the above control strategies and minimize weaknesses.First of all, it is concluded that the entire control system has good versatility, dependable,low cost and accurate control obtained by analyzing the study of the control system of micro electric cylinder performed by Scholars and researchers both at home and abroad and comparing the advantages and disadvantages of various control programs, Therefore, a control system mainly based on ARM Cortex-M3 microprocessor is proposed and the principle of the whole control system is introduced in the paper.Secondly, the main components of micro electric cylinder will be the selected. In this paper,the brushless DC motor with low noise and high positional accuracy is used as a drive motor and expounds its working principle and the commutation process. Ball screw with high precision and stable transmission is used as a driving components and photoelectric encoder which can detect motor speed and position information is used as a detecting element.Then, the hardware platform of control system is constructed, and the peripheral circuit is designed. Mainly includes the power drive circuit, inverter circuit, photoelectric encoder circuit, power circuit, serial communication circuit. Circuit diagrams are given, and expound the function and working principle of the circuit.At the same time, the software platform of control system is constructed. The entire software system is divided into several modules by adopting the idea of modularization. The related modules need to be called respectively as the system is running. The uClinux operating system is transplanted and illustrated for the transplant process, mainly including the BLOB transplantation, kernel cutting and download. The interface of PC application software is developed with PC as upper machine.Additionally, Mathematical modeling is performed for the control system of micro electric cylinder. The simulation model is established by the MATLAB/Simulink, and it is observed from the simulation curve, fuzzy self-tuning PID control algorithm obviously better as compared to PID control.Finally, it is can be observed from the data obtained by the simple test for the micro electric cylinder, this control system has good stability and high control precision.The control system of micro electric cylinder designed in this paper, can not only control accurately the micro electric cylinder and reduce cost, but also can have made certain contribution for the development at home and abroad in the study of the micro electric cylinder control methods. |
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