While DC current transformer is questionable in locomotive application, the Hall-generatorcurrent sensor, on the other hand, appears to be advanced in performance.
文章概述了直流互感器在机车上应用所存在的问题及霍尔电流传感器的优越性能;
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The rat generator operates at the femtowatt scale -- a pico-amp is a million millionth of an amp, so it is a tiny amount of current -- so not very much power.
In some parts of the world, cyclists have been powering safety lights for years with devices called bicycle dynamos, which use a generator to create alternating current with every turn of the wheels.