Abstract
The motion characteristics and flow field variation of Thomson-type actuator have been investigated in this article, in which a two-dimensional axisymmetric cylindrical coordinate model is constructed and described by a set of multi-physical equations reflecting the flow field, transient electromagnetic field, electric circuit, and mechanical motion. The motion performance of the actuator and the pressure drag caused by the high-speed movement of metal plate are analyzed under different opening speeds. It shows that the pressure drag has a strong buffer effect on the actuator. The influence of the laminar and standard [Formula: see text] models on the pressure distribution, velocity distribution, and motion characteristics is focused on. In comparison with the laminar model, the pressure drag of the turbulence model is much higher than the laminar model and is more beneficial for the buffer design of the mechanism.
Highlights
High-speed switch (HSS) based on Thomson-type actuator has gained more and more interests in the limit and fast breaking of DC fault current owing to its short delay time and high-response speed
When a pulse current iC is injected into Thomson coil (TC), the eddy current iP in the metal plate is induced by the transient magnetic field
The laminar model is taken in the calculation of the flow field and the time step is set to 5 ms Figure 6 shows the calculated results of FZ, Fd, speed, and displacement of metal plate for different capacitances during the opening
Summary
High-speed switch (HSS) based on Thomson-type actuator has gained more and more interests in the limit and fast breaking of DC fault current owing to its short delay time and high-response speed. The current and voltage of TC as well as the electromagnetic force are all calculated by ANSYS first and coupled to the motion equations to obtain the speed of metal plate. With the flow field calculated by means of hydrodynamics equations, the pressure distribution is obtained and the pressure drags on both sides of metal plate are determined, which is added to the electromagnetic force calculated in the step to solve the motion equations. The laminar model is taken in the calculation of the flow field and the time step is set to 5 ms Figure 6 shows the calculated results of FZ, Fd, speed, and displacement of metal plate for different capacitances during the opening. When the metal plate approaches the end position, Fd rises fast and becomes much higher in the case of laminar model, which may be attributable to the shock effect before the metal plate is collided
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