One way to increase the efficiency of a high-bypass jet engine is to turn the fan into an open rotor, a bit like returning to propellers, but using two rings of stubby counter-rotating blades.
Turn the electric motor shaft if it rotates freely, Measure the air gap between the stator and the rotor.
扳动电动机的转轴是否能自由旋转，测量定子和轴承的空隙。
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Based on the analysis of AC impedance and two poles voltage test data, the reason of turn - to - turn short circuit fault caused by having copper dregs in generator rotor winding was found.