Ultrafast rotation of magnetically levitated macroscopic steel spheres
Ultrafast rotation of magnetically levitated macroscopic steel spheres
复制标题
磁悬浮宏观钢球的超快旋转
作者：
M. Schuck;D. Steinert;T. Nussbaumer;J. Kolar
推动超高速电机的极限。我们的世界越来越多地由电力驱动，电力主要是通过电动机转换为机械能或从机械能转换而来。一些应用已经推动了这些机器的小型化，从而导致高转速。虽然每分钟几十万转的速度已经在工业上使用，但我们报告了达到4000万转/分钟的电动机的实现，以探索潜在的物理边界。毫米级的钢球在真空中被磁场悬浮和加速，被用作转子。圆周速度超过1000 m/s，离心加速度超过4 × 108倍重力。这些结果开辟了新的研究可能性，例如在极端离心载荷下测试材料，并为未来电力驱动系统的发展提供了见解。
Pushing the limits of ultrahigh-speed electrical machines. Our world is increasingly powered by electricity, which is largely converted to or from mechanical energy using electric motors. Several applications have driven the miniaturization of these machines, resulting in high rotational speeds. Although speeds of several hundred thousand revolutions per minute have been used industrially, we report the realization of an electrical motor reaching 40 million rpm to explore the underlying physical boundaries. Millimeter-scale steel spheres, which are levitated and accelerated by magnetic fields inside a vacuum, are used as a rotor. Circumferential speeds exceeding 1000 m/s and centrifugal accelerations of more than 4 × 108 times gravity were reached. The results open up new research possibilities, such as the testing of materials under extreme centrifugal load, and provide insights into the development of future electric drive systems.