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电能质量与谐波测量技术讲座——第一讲 谐波:检测、诊断和解决
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作者 Dick Troberg 《仪表技术》 1999年第1期37-37,共1页
谐波是非常有害的,它们会烧环马达和变压器,或者,引起一些小的不起眼但却与日俱增的损坏.谐波的累积效应只有当首次症状出现时才会被注意到.谐波产生的原因:非线性负载谐波是由非线性负载造成的,例如,PC机,打印机,荧光灯,调速马达驱动,... 谐波是非常有害的,它们会烧环马达和变压器,或者,引起一些小的不起眼但却与日俱增的损坏.谐波的累积效应只有当首次症状出现时才会被注意到.谐波产生的原因:非线性负载谐波是由非线性负载造成的,例如,PC机,打印机,荧光灯,调速马达驱动,充电器以及电镀设备等.这些设备从电路中获取跃变的脉冲波形电流而不是平滑的正弦波.结果是含有谐波的畸变电流回流到电力系统的其它地方.办公室的非线性负载通常是单相的,而工厂里通常是三相的. 展开更多
关键词 谐波 电能质量 非线性负载 谐波测量技术
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High Accuracy On-line Measurement Method of Motion Error on Machine Tools Straight-going Parts
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作者 苏恒 洪迈生 +1 位作者 魏元雷 李自军 《Journal of Donghua University(English Edition)》 EI CAS 2003年第1期109-114,共6页
Harmonic suppression, non-periodic and non-closing in straightness profile error that will bring about harmonic component distortion in measurement result are analyzed. The countermeasure-a novel accurate two-probe me... Harmonic suppression, non-periodic and non-closing in straightness profile error that will bring about harmonic component distortion in measurement result are analyzed. The countermeasure-a novel accurate two-probe method in time domain is put forward to measure straight-going component motion error in machine tools based on the frequency domain 3-point method after symmetrical continuation of probes' primitive signal. Both straight-going component motion error in machine tools and the profile error in workpiece that is manufactured on this machine can be measured at the same time. The information is available to diagnose the fault origin of machine tools. The analysis result is proved to be correct by the experiment. 展开更多
关键词 Tendency profile Symmetry continuation Initial value Motion error Error separation technology.
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