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 <title><![CDATA[55KW；220V三相，电机启动时有异响？？？]]></title>
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 <description><![CDATA[Latest 50 replies of 55KW；220V三相，电机启动时有异响？？？]]></description>
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 <description><![CDATA[长知识了！大多进口设备是三相220V，单相110v]]></description>
 <link><![CDATA[http://www.ymmfa.com/read-gktid-120041#1149349.html]]></link>
 <author><![CDATA[不再头疼]]></author>
 <category><![CDATA[综合讨论]]></category>
 <pubdate><![CDATA[Tue, 25 Oct 2011 01:53:25 +0000]]></pubdate>
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<item>
 <title><![CDATA[]]></title>
 <description><![CDATA[长知识了]]></description>
 <link><![CDATA[http://www.ymmfa.com/read-gktid-120041#1148227.html]]></link>
 <author><![CDATA[gpp0603]]></author>
 <category><![CDATA[综合讨论]]></category>
 <pubdate><![CDATA[Sun, 23 Oct 2011 08:38:09 +0000]]></pubdate>
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 <title><![CDATA[]]></title>
 <description><![CDATA[明白载波形成作用,谢谢 学习了]]></description>
 <link><![CDATA[http://www.ymmfa.com/read-gktid-120041#1148070.html]]></link>
 <author><![CDATA[shenyijin]]></author>
 <category><![CDATA[综合讨论]]></category>
 <pubdate><![CDATA[Sun, 23 Oct 2011 04:31:33 +0000]]></pubdate>
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 <title><![CDATA[]]></title>
 <description><![CDATA[学习学习。。。。。]]></description>
 <link><![CDATA[http://www.ymmfa.com/read-gktid-120041#1148063.html]]></link>
 <author><![CDATA[lu770yuang]]></author>
 <category><![CDATA[综合讨论]]></category>
 <pubdate><![CDATA[Sun, 23 Oct 2011 04:16:42 +0000]]></pubdate>
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 <title><![CDATA[]]></title>
 <description><![CDATA[学习一下了啊]]></description>
 <link><![CDATA[http://www.ymmfa.com/read-gktid-120041#1127622.html]]></link>
 <author><![CDATA[zhumen]]></author>
 <category><![CDATA[综合讨论]]></category>
 <pubdate><![CDATA[Sun, 18 Sep 2011 12:16:17 +0000]]></pubdate>
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 <title><![CDATA[]]></title>
 <description><![CDATA[谢谢各位！]]></description>
 <link><![CDATA[http://www.ymmfa.com/read-gktid-120041#1127614.html]]></link>
 <author><![CDATA[zungli]]></author>
 <category><![CDATA[综合讨论]]></category>
 <pubdate><![CDATA[Sun, 18 Sep 2011 12:05:10 +0000]]></pubdate>
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 <title><![CDATA[]]></title>
 <description><![CDATA[学习了]]></description>
 <link><![CDATA[http://www.ymmfa.com/read-gktid-120041#1127493.html]]></link>
 <author><![CDATA[yyy313]]></author>
 <category><![CDATA[综合讨论]]></category>
 <pubdate><![CDATA[Sun, 18 Sep 2011 08:57:58 +0000]]></pubdate>
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 <title><![CDATA[]]></title>
 <description><![CDATA[变频器大多是采用PWM调制的形式进行变频器的。也就是说变频器输出的电压其实是一系列的脉冲，脉冲的宽度和间隔均不相等。其大小就取决于调制波和载波的交点，也就是开关频率。开关频率越高，一个周期内脉冲的个数就越多，电流波形的平滑性就越好，但是对其它设备的干扰也越大。载波频率越低或者设置的不好，电机就会发出难 ..]]></description>
 <link><![CDATA[http://www.ymmfa.com/read-gktid-120041#1127484.html]]></link>
 <author><![CDATA[wuliang211]]></author>
 <category><![CDATA[综合讨论]]></category>
 <pubdate><![CDATA[Sun, 18 Sep 2011 08:40:50 +0000]]></pubdate>
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 <title><![CDATA[]]></title>
 <description><![CDATA[不会的，你是什么品牌的变频器，看看说明书，里面有载波频率的调整方法，现在有噪音就是因为载波太小了]]></description>
 <link><![CDATA[http://www.ymmfa.com/read-gktid-120041#1127482.html]]></link>
 <author><![CDATA[wuliang211]]></author>
 <category><![CDATA[综合讨论]]></category>
 <pubdate><![CDATA[Sun, 18 Sep 2011 08:37:29 +0000]]></pubdate>
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 <title><![CDATA[]]></title>
 <description><![CDATA[载波调整要注意什么？会不会对电机产生影响的，比如发热严重什么的]]></description>
 <link><![CDATA[http://www.ymmfa.com/read-gktid-120041#1127480.html]]></link>
 <author><![CDATA[zungli]]></author>
 <category><![CDATA[综合讨论]]></category>
 <pubdate><![CDATA[Sun, 18 Sep 2011 08:33:34 +0000]]></pubdate>
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 <title><![CDATA[]]></title>
 <description><![CDATA[把变频器的载波频率加大一些，就可以解决问题了]]></description>
 <link><![CDATA[http://www.ymmfa.com/read-gktid-120041#1127479.html]]></link>
 <author><![CDATA[wuliang211]]></author>
 <category><![CDATA[综合讨论]]></category>
 <pubdate><![CDATA[Sun, 18 Sep 2011 08:30:11 +0000]]></pubdate>
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 <title><![CDATA[]]></title>
 <description><![CDATA[变频器载波频率调整一下]]></description>
 <link><![CDATA[http://www.ymmfa.com/read-gktid-120041#1127476.html]]></link>
 <author><![CDATA[tangyq]]></author>
 <category><![CDATA[综合讨论]]></category>
 <pubdate><![CDATA[Sun, 18 Sep 2011 08:12:33 +0000]]></pubdate>
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