Research On Drive Control Of Moving Magnet Linear Compressor

In the context of global energy shortages,trillions of households are the main consumers of electricity.The main power-consuming equipment is large-scale household appliances such as air conditioners and refrigerators.The core component of domestic air-conditioner refrigerators is compressors.To improve the efficiency of the compressor,it means reducing the amount of useless energy consumption.The traditional rotary compressor generally needs the transmission device to convert the rotary motion into a linear motion,and the energy passes through the intermediate level transformation,which has the problems of low efficiency and serious loss.Linear compressors directly drive the piston to perform reciprocating linear motion.Among them,the moving magnet linear compressors have broad prospects for development due to their high-magnetism and structural characteristics of permanent magnets.At present,the study of moving magnet linear compressors is not yet mature.On the one hand,it is the design and processing of complex structures.On the other hand,it is the problem of anti-jamming capability and efficiency improvement under the working environment.However,with the development of engineering electromagnetism,power electronics and control science,the problem has gradually been solved.The problem that the compressor's stroke controlling was focused on,so that the system has a higher control accuracy and good anti-disturbance performance.This paper mainly discusses the feasible scheme for the improvement of the working efficiency of the moving magnetic linear compressor that combined with the motor structure optimization and intelligent control algorithm.This paper first introduces the working principle and structure of the moving magnet linear compressor,establishes and analyzes the mathematical model of magnetic circuit model,mechanical system model and electromagnetic system model of the moving magnet linear compressor.Then,the finite element simulation analysis was performed on the dynamic magnetic linear compressor to analyze the variation law of the piston thrust during the movement of thepermanent magnet.The axial thrust of the permanent magnet was analyzed on the key structural parameters of the linear motor,and finally a set of feasible actions was given.Magnetic linear compressor structural optimization program.Then,based on the established mathematical model,the Simulink simulation model of the moving magnetic linear compressor was built,and the PID controller and fuzzy PID controller were used to simulate the piston displacement and analyze the results.It was found that the fuzzy PID controller was in the displacement of the piston.There are obvious advantages in the stability and accuracy of control.Finally,a semi-physical motion control simulation platform based on dSPACE was built.The open-loop no-load experiment,PID control and fuzzy PID control under no-load disturbance experiments and load experiments were performed.According to the experimental analysis,the fuzzy PID control can make the piston stroke larger,the tracking speed is faster,the error is smaller,and the anti-jamming ability is stronger;under the load,a higher displacement can be output,and the working efficiency can reach82.53%.The result shows that The structural optimization strategy and control strategy proposed in this topic can significantly improve the efficiency of the moving magnetic linear compressor.