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 <title><![CDATA[求助]]></title>
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 <title><![CDATA[工控人家园]]></title>
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 <description><![CDATA[工控人家园]]></description>
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 <description><![CDATA[[s:17]]]></description>
 <link><![CDATA[http://www.ymmfa.com/read-gktid-94212#956716.html]]></link>
 <author><![CDATA[waitfor]]></author>
 <category><![CDATA[综合讨论]]></category>
 <pubdate><![CDATA[Fri, 14 Jan 2011 10:15:23 +0000]]></pubdate>
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 <title><![CDATA[]]></title>
 <description><![CDATA[谢谢给位前辈帮忙，我知道了！]]></description>
 <link><![CDATA[http://www.ymmfa.com/read-gktid-94212#956698.html]]></link>
 <author><![CDATA[lzmtxp99]]></author>
 <category><![CDATA[综合讨论]]></category>
 <pubdate><![CDATA[Fri, 14 Jan 2011 09:54:05 +0000]]></pubdate>
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 <title><![CDATA[]]></title>
 <description><![CDATA[步进电机的速度是依靠输出频率控制，距离是依靠脉冲个数控制，方向是驱动器方向控制端的状态控制。]]></description>
 <link><![CDATA[http://www.ymmfa.com/read-gktid-94212#956586.html]]></link>
 <author><![CDATA[wwcwwc]]></author>
 <category><![CDATA[综合讨论]]></category>
 <pubdate><![CDATA[Fri, 14 Jan 2011 06:11:17 +0000]]></pubdate>
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 <description><![CDATA[谢谢了！&nbsp;&nbsp;再请问一下，控制速度是不是就是来控制其输出的频率的大小？]]></description>
 <link><![CDATA[http://www.ymmfa.com/read-gktid-94212#956553.html]]></link>
 <author><![CDATA[lzmtxp99]]></author>
 <category><![CDATA[综合讨论]]></category>
 <pubdate><![CDATA[Fri, 14 Jan 2011 05:36:06 +0000]]></pubdate>
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 <title><![CDATA[]]></title>
 <description><![CDATA[调节周期，PWM&nbsp;&nbsp;S1 S2 Y0 ，改变S2 调节。用PLSY也可以。
另外用模拟量调速用的最多。]]></description>
 <link><![CDATA[http://www.ymmfa.com/read-gktid-94212#956451.html]]></link>
 <author><![CDATA[zhouzhoubibi]]></author>
 <category><![CDATA[综合讨论]]></category>
 <pubdate><![CDATA[Fri, 14 Jan 2011 03:04:15 +0000]]></pubdate>
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 <title><![CDATA[]]></title>
 <description><![CDATA[用DDVI]]></description>
 <link><![CDATA[http://www.ymmfa.com/read-gktid-94212#956448.html]]></link>
 <author><![CDATA[jx_einstein]]></author>
 <category><![CDATA[综合讨论]]></category>
 <pubdate><![CDATA[Fri, 14 Jan 2011 03:00:03 +0000]]></pubdate>
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