Abstract
In order to improve the performance of the electromagnet for electro-hydraulic proportional valve used in shock absorber, the static and dynamic characteristics of the proportional electromagnet are simulated and analyzed, which provides theoretical basis for the design and optimization of structural parameters of the proportional electromagnet. In this paper, the magnetic circuit model and finite element simulation model of the proportional electromagnet used in shock absorber are established, and the Ansoft software is applied to analyze the influence of the key structural parameters of the proportional electromagnet on static output force and dynamic characteristics. The results demonstrate that with the increase of the depth of basin mouth, the effective travel of the proportional electromagnet increases, and the mean value of the electromagnetic force in the working range decreases. The larger the radial clearance between armature and guide sleeve is, the smaller the electromagnetic force in the effective travel is. When the depth of the basin mouth is 3.9 mm, the slope of the magnetic isolation ring is 35°, the chamfer length of the convex platform is 0.2 mm, and the radial clearance is 0.3 mm, the proportional electromagnet has good displacement-force and current-force characteristics. According to the further transient analysis, it is found that when the voltage amplitude is 24 V, the rise time of the electromagnetic force under step excitation signal is about 40 ms.
Highlights
The electro-hydraulic proportional valve used in the shock absorber can be applied to adjust the damping force, and improve the comfortability of the vehicle
The results demonstrate that for the direct-acting electromagnet, the magnitude of current shows the greatest effects on the electromagnetic force
Song et al [7] established a model of the proportional electromagnet actuator (PEA) and analyzed the hysteresis principle, the results demonstrate that this control strategy can enhance the practicability and reliability of the long-stroke proportional electromagnet in case of position sensor fault and improve the position tracking performance during current closed-loop control
Summary
The electro-hydraulic proportional valve used in the shock absorber can be applied to adjust the damping force, and improve the comfortability of the vehicle. The results demonstrate that for the direct-acting electromagnet, the magnitude of current shows the greatest effects on the electromagnetic force They improved the performance of the electromagnet by optimizing the structure. Zhang and Xu [5] accomplished simulation analysis of a certain type of the proportional electromagnet by ANSYS software, and obtained the static magnetic force curves with the change of air gap under different parameters (angle of magnetic isolation ring, length and shape of armature, etc.). By comparison, they accomplished the improvement of the previous model. The variation of the electromagnetic force, current and armature displacement with time is used to provide a theoretical basis for designing and optimizing the structural parameters of the proportional electromagnet
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