Abstract
The Thomson coil actuator has an important application prospect in direct current high-speed switch due to its short respond time and fast operation speed. However, the large electromagnetic impact force during the opening process may bring the stress deformation of movable components and thus cause damage to the mechanism. Therefore, the dynamic stress and strain evaluation of the moving parts is very important for the design and optimization of direct current high-speed switch. In this article, a novel method of structure strength analysis based on the flexible body theory is established for direct current high-speed switch. The electromagnetic and buffer forces in the rapid opening process are calculated, and then the stress and strain distribution of the key components are obtained. Finally, the strain test circuit of the key components is built. By comparing the simulation and experimental results of dynamic strain, the validity of the established simulation model is verified.
Highlights
With the rapid development of modern interconnection power grids, an increasing demand for high-speed switches (HSSs) appears, especially in medium and high voltage direct current (DC) systems.[1,2,3,4] In order to acquire an ultra-fast actuator functionality in mechanical switching mechanisms, Thomson coil (TC) is usually a suitable choice to be employed with the capability of exerting massive forces in extremely short time.[5,6,7,8,9] Figure 1 provides the work principle of TC actuator
When a pulse current iC is injected from an external source into TC, the magnetic field B is induced and the magnetic field lines across the metal plate create concentric eddy currents ip flowing in opposite direction
A huge electromagnetic repulsion force is generated between TC and metal plate, which will accelerate the metal plate separating from TC
Summary
With the rapid development of modern interconnection power grids, an increasing demand for high-speed switches (HSSs) appears, especially in medium and high voltage direct current (DC) systems.[1,2,3,4] In order to acquire an ultra-fast actuator functionality in mechanical switching mechanisms, Thomson coil (TC) is usually a suitable choice to be employed with the capability of exerting massive forces in extremely short time.[5,6,7,8,9] Figure 1 provides the work principle of TC actuator. Considering that the TC actuator generates a large electromagnetic force during the moving process, its key components such as the metal plate, the connecting rod, and the insulation rod will suffer severe shocks, which may cause deforming of these components.
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