Research On Bi-directional Multiplex Solenoid

As an important approach to automatic control, electro-hydraulic servo control system has been widely used in many sections of national economy and social surroundings due to its advantages such as high level of control precision, quick response speed and high immunity to load variations. Electro-hydraulic servo valves, the key part of an EHC servo system, with its function of transferring low-power electrical signal to large-power hydraulic output quickly and precisely, play an essential role in deciding the whole performance of the system. As the key part of electro-hydraulic servo valves, the electrical-mechanical converters become much more important to all researchers.The thesis deep analyzes and researches the direct-drive servo valve, utilizing theory analysis, computer simulation, finite element analysis and experimental study. A new-type bi-directional multiplex electrical-mechanical converter, which can make two different processes in one cycle, is put forward. The relations of its structure parameters are confirmed by theory analysis and finite element numerical computation, and the experimental results indicate that the converter has a linear working range of 3mm. with the highest driving force reached 60N, in one direction, and in the other direction, it could move the distance about 4mm in 45ms.In chapter 1, the history of the electrical-mechanical converter is introduced, based on the abroad and overseas research information about it. The present technical status, especially the structure and performance of them, are described not only in the term of new structures, but also in the field of new materials. Finally, some trends on the development of the electrical-mechanical converter are summarized.In chapter 2, the structure characters of proportional solenoid and high-speed solenoid are introduced by analyzing the performance of them. This chapter deep analyzes the main structure parameters confirmed by utilizing FEA simulations, researches the electromagnetic theory, and furthermore, concludes the affection rules of the parameters to the performances. Based on all above this, the chapter first carries out the structure of the bi-directional multiplex solenoid, and also introduces the choices of the components.In chapter 3, based on finite element analysis, considering the magnetic leakage and non-linear magnet characteristics, the static mathematical model is established, and...