| Electro-hydraulic proportional valve and switching valve are important hydraulic control components, widely used in all aspects of industrial automation and engineering automation. In recent years, with the development of technology, improve and optimize the characteristics of the solenoid valve has become the focus of research and advanced technology associated with a significant impact on the field of hydraulic control. As one of important part of a proportional element:electrical-mechanical converter, its performance largely determines the quality of the performance a proportional element, and therefore in-depth study electrical solenoid valve-mechanical converter, to improve the performance of the hydraulic valve has important theoretical significance and practical value.In this paper, from the basic structure of a single solenoid valve and its control system, we study the parameter identification and signal correction to improve the output characteristics of the two solenoid valves, and design the corresponding algorithm.Derivation of the equations of magnetic valve solenoids, establish a mathematical model and study the flux, the electromagnetic force and the inductance variation with the input signal and displacement when the different geometric design ring; Against the problem of electromagnetic relatively steep output power characteristics, discusses the basin-type magnetic pole piece of analytical equations, draw the pole shoe parameters affect to the output of the electromagnetic force, the theoretical analysis shows that this method can improve the properties of the electromagnetic force Constant output.For the output force steep and hysteresis characteristics problems of switching solenoid, it is proposed to improve the electromagnetic force based on the control voltage signal compensation strategies to improve the ferromagnetic material to cause the solenoid output hysteresis power. To compensate for input voltage of switching solenoid with bilinear interpolation method in order to leveled output electromagnetic force, and it is tested to verify correctness on the electromagnet system test platform. Studies show that using this method can improve the output electromagnetic contant force characteristics of the switching electromagnet, and significantly can reduce the output electromagnetic force hysteresis of switching solenoid and proportional solenoid.In order to reduce the cost of single solenoid valve, extend the application field of the electromagnet, it is proposed that incremental flux is calculated by secondary winding of the electromagnetic parameters,based on the increased secondary winding in the general electromagnets, theoretically deduce the electromagnet force balance equation and force balance equation under the PWM control mode, research and analysis the electromagnetic characteristics of the primary and secondary windings and simulate the model, draw a relationship between the winding current and flux linkage increments and iron location. And establish a simulation model of valve power amplifier, the simulation analysis of its driving characteristics, in order to provide a basis for the next test verification.The static electromagnetic properties of the switching electromagnet is measured by experiments, it obtains that flux characteristic quantities can react movable core location information. Integration method is proposed to calculate the incremental flux and to design algorithm of using winding flux incremental and input current signal recognition solenoid moving core position, and establish a semi-physical simulation platform based on the location of the solenoid valve, the test makes experimental verification of the switching electromagnet identifying incremental position by magnetic chain.It is obtained that the variation relationship between flux incremental and electromagnetic forces of proportional solenoid and switching electromagnet by theoretical analysis. The flux incremental of the two kind eletromagnet is measured by the test, it is be made that moving core location identification experiment of proportional solenoids and switching solenoid. Studies show that this method can improve the characteristics of proportional solenoid, to reduce proportional solenoid costs, and expand the scope of practical electromagnet; and under certain conditions, lower-cost switching solenoid can also be in place of proportional solenoid. |
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