变频器辐射30~50MHz不过

变频器辐射测试,30~50MHz不过.后来将变频器与马达之间的接线断开,但是还是让变频器运行(IGBT动作),载波已经降至2K,IGBT的驱动电阻为51欧姆,还是不过.尝试降载波(从6K到2K)没有效果,IGBT也增加过一倍,还是没有效果.
变频器只上电,而不运行(即只有开关电源动作)辐射是OK的.具体请见下图.有没有比较好的对策.求教~~~
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