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2098DSDHV220
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2098DSD005
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2098DSD005XNV1
2098DSD0101746-N2
1746-NI4
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庫伯勒編碼器kuebler 05.WWAKS8-6/S366現貨對于感性負載和容性負載來說,電壓和電流就存在相位差,(純感性負載電壓超前電流90度,純容性是電流超前電壓90°)φ不為0,cosφ不等于1,所以就不能按P=UI來計算。曾有初學電工的朋友問我,說一臺3000瓦的三相電機,電流=功率/電壓=3000/380=7.89A,為什么不對呢?電機這就涉及到三相功率的計算,P=UIcosφ是單相功率計算,三相功率計算公式是:P=3U相I相cosφ,這個公式中的電壓和電流指的是相電壓和相電流,但咱們平時所說的額定電壓、額定電流指的是線電壓和線電流。