Design And Analysis Of Electric-mechanical Converter With Built-in Coil For Valve

As an indispensable part of hydraulic control system,hydraulic valve plays an important role in various fields of civil and national defense control system.The electro-mechanical converter is the core component of the electro-hydraulic proportional valve.The advantages and disadvantages of its working characteristics directly affect the working state of the valve,and then affect the working performance of the hydraulic system acted by the valve.Therefore,it is of great significance to further study the existing types of electro-mechanical converters and continuously innovate the structural forms of electro-mechanical converters to meet the increasing requirements of the use and control precision of electro-hydraulic proportional servo valves in modern industry.The magnetic field of the moving-coil electromechanical converter is generate by the excitation of the permanent magnet,and the magnetic field distribution will not change during the movement of the actuator.Theoretically,a constant working air gap magnetic field can be generated,which fully meets the working requirements of the electromechanical converter.However,the complexity and assembly difficulty of its structural parts make it difficult to maximize the use of each part of the structure,and the performance of moving coil electromechanical converter is also affected.The structural improvement and scientific optimization of moving coil electromechanical converters are helpful to improve their working characteristics and promote the further development of moving coil electromechanical converters.In this paper,a coil built-in moving coil electromechanical converter is proposed.Taking it as the research object and aiming at improving its static output force,the coil built-in moving coil electromechanical converter is systematically analyzed and studied by combining theoretical analysis and simulation analysis methods.The main contents of each chapter are as follows:Based on the development of electro-hydraulic servo proportional valve and electro-mechanical valve converter,the research status and significance of valve electro-mechanical converter are described.The structure form and working principle of valve electromechanical converters for different types and applications are introduced,and the research status of various types of electromechanical converters is expounded and summarized.The structural characteristics and working principle of the coil built-in moving coil electromechanical converter are described.The establishment process of magnetic circuit is analyzed and described by the laws of magnetic circuit and the related theories of magnetic field.The magnetic circuit model and the mathematical model of the electromagnetic output force of the coil built-in moving coil electromechanical converter are established,and based on the magnetic circuit model and the mathematical model,the direction of parameter optimization of the electromechanical converter is defined.According to the working principle,the magnetic circuit model and the mathematical model,the method of improving the output force of the moving-coil electromechanical converter is described,and the hysteresis,zero adjustment and magnetic leakage problems that affect the performance of the moving-coil electromechanical converter are analyzed in detail.Structural improvements are proposed to ameliorate the negative impact of these problems.A two-dimensional finite element analysis model of coil built-in moving coil electromechanical converter was established.The influence of structural parameters on the output thrust was analyzed in detail by using finite element analysis software.The parameter values of the optimized structural parameters are obtained,and the overall structure of the electro-mechanical converter is determined under the optimized values.The static characteristic working curve of the whole structure after optimization is verified.The output force is stable,and the output force-current curve has a high linearity.The dynamic characteristics of the coil built-in moving coil electromechanical converter are simulated and analyzed by using the finite element analysis model,and the dynamic characteristic curve is obtained,and the feasibility of its structure is confirmed.According to the performance index of the electromechanical converter,the test principle of the electromechanical converter is analyzed,the test system of the electromechanical converter is established,and the main structure and equipment selection of the test system are described.Some parts of the structure of electromechanical converter and the matters needing attention in prototype design are expounded.