The shape of the rail in the electromagnetic linear propulsion mechanism affects the current distribution.The convex rail has obvious advantages over the flat one and the concave one in forming the uniform distribution of the current.However,there is no research so far to analyze the influence of key parameters such as the radius of the arc surface and the thickness of the coating material on the current distribution for the convex rail.In this light,Maxwell finite element simulation software and the equivalent frequency method were used to analyse the current density and Joule heating power dis-tribution of different arc radius and coating material thickness for a 25 mm small-caliber convex rail electromagnetic linear propulsion mechanism.The results show that the increasing radius of the arc surface of the mechanism makes the position of the maximum current density move from the top of the arc to the edges of both sides,and the maximum value also increases.The steel cladding rail re-duces the maximum value of the surface current density effectively,but leads to higher Joule heating power.For this mechanism,the radius of 20 mm can reach the most uniform current density distribu-tion,and the steel coating thickness of 1 mm can reduce the surface Joule heating power.The results represent progress on the optimization of convex rail.
关键词
直线推进机构/弧面导轨/电流密度/焦耳热功率
Key words
linear propulsion mechanism/convex rail/current density/Joule heating power
维普
万方数据