The paper introduces the application, main alteration plan and the setting of relational parameters of technique of alternating current frequency conversion in Longmen planer′s electrical alteration.

介绍交流变频调速技术在龙门刨床电气改造中的应用和总体改造方案及有关参数的设置。

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The control effect of electromagnetic force on cylinder wake, lift force and drag force , which was caused by alternating current, is related to its frequency.

而交流电所产生的电磁力对于绕流涡街、升力、阻力的控制作用，则与所使用的频率有关。

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The system may measure many circuits high - frequency alternating current , direct current , frequency, efficiency of inverter .

系统测试项目有多路高频交流电流，直流电流，频率，逆变器的效率等。

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Although they have not been found to cause any harm, the cables on conventional pylons, which transmit a three-phase alternating current, generate a strong electric field and a continuous buzz of low-frequency radio waves.

ECONOMIST: Monitor