Integrated Design And Research Of Digital Control System For Pole Rolling Mill

At present,micro-processors and digital circuits have been widely used in various fields,the production technology level has been further improved due to its stability and fast data processing capabilities.The battery pole piece rolling mill is an important mechanical device in the production process of battery pole pieces.In order to overcome the problems of redundant hardware structure and slow signal response speed of the control system of the pole piece rolling mill.This dissertation proposes a method of digital control system integration,mainly from two aspects,including the improvement of the control system hardware structure,and the signal response speed,the following aspects of research have been carried out.First of all,in this dissertation,the digital control technology and system integration theory w deeply studied to explore the combination of these two theories and technologies.By making full use of the multi-task processing ability and the advantage of fast calculation of the microprocessor,the data partition structure of STM32 and DSP dual control chip is proposed,which improves the data throughput and processing speed of the system.And on this basis,the integrated scheme of tension detection,deviation correction detection,Ethernet interface and other hardware circuits was designed.At the same time,in order to make the hardware structure of the control system clear and simple,according to the strength of the electrical signal,the hardware circuit of the system is divided into three parts: motor drive board,main chip control,and data transmission board.In order to reduce the influence of high-frequency signals,peak current and other signals on system stability,a separate power supply is adopted to supply power to each part.Secondly,the design of AC motor hardware and software has a great influence on its response speed and stability,and the correct choice of control algorithm and drive circuit is the key to the problem.Through comparative analysis the advantages and disadvantages of different control algorithms,decided to use a vector control algorithm with high power utilization ratio and the advantages of uniform flux,can enhance the response speed of AC motor,using the simulation software simulation under different rotational speed and load changes,the state of the AC motor torque and the stator voltage,AC motor under the vector control algorithm,the response speed and stability of the high.Then,the characteristics of the power component and the drive chip of the drive motor are compared and analyzed.The drive circuit of the AC motor is designed by applying the PIM power device and the drive chip HCPL-316 J with soft shutdown and undervoltage protection.Finally,an adjustable power supply,adjustable precision resistance and serial debugging assistant are used to simulate the working state of the pole piece rolling mill,and different functional circuits are tested.The experiment shows that the tension detection circuit has good linearity,and the voltage output waveform of the switch detection and control circuit is stable,Serial debugging assistant can receive the data sent by the data communication interface.Proved the feasibility of circuit design.Under the premise of ensuring the safety and reliability of the test process,the experiment of using low-power AC motors to design the output voltage waveform of the AC motor drive board at different frequencies and speeds can be seen from the PWM waveform measured at the output end.The fast speed proves that the scheme is effective and feasible for simplifying the hardware structure of the pole piece rolling mill control system and improving the signal response speed.