发布时间:2025-01-21 06:36:35
变频器供电笼型异步电机应用导则指出:应该两端接地。个人意见,先按照两端接地试验,若地电流较大的话,可考虑改为单端接地!
钢材12cr18ni9 在哪个标准中有这个材质钢材 不锈钢有含碳量这么高的么
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