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	  	<div class="titlebg_image">软起动器控制电动机的几个重要概念</div>
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			<div class="stitle_s"><strong>软起动器控制电动机的几个重要概念</strong></div>
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			<div class="stime_text">作者:西驰</div>
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<P style="TEXT-INDENT: 18pt"><FONT size=2><FONT face=宋体><B><SPAN lang=EN-US>1、脉冲突跳起动方式</SPAN></B><SPAN lang=EN-US><?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /><o:p></o:p></SPAN></FONT></FONT></P>
<P style="TEXT-INDENT: 18pt"><FONT size=2><FONT face=宋体>对于静阻力矩较大的负载，必须施加一个短时的大起动力矩，以克服静摩擦力，这就要求起动器可以短时输出<SPAN lang=EN-US>90%的额定电压。<o:p></o:p></SPAN></FONT></FONT></P>
<P style="TEXT-INDENT: 18pt"><FONT size=2><FONT face=宋体><B><SPAN lang=EN-US>2、接触器旁路工作模式</SPAN></B><SPAN lang=EN-US><o:p></o:p></SPAN></FONT></FONT></P>
<P style="TEXT-INDENT: 18pt"><FONT size=2><FONT face=宋体>当电动机全速运行后，用旁路接触器来取代已完成任务的软起动器，以降低晶闸管的热耗，提高系统效率。在这种模式下用一台软起动器起动多台电动机。<SPAN lang=EN-US><o:p></o:p></SPAN></FONT></FONT></P>
<P style="TEXT-INDENT: 18pt"><FONT size=2><FONT face=宋体><B><SPAN lang=EN-US>3、节能运行模式</SPAN></B><SPAN lang=EN-US><o:p></o:p></SPAN></FONT></FONT></P>
<P style="TEXT-INDENT: 18pt"><FONT size=2><FONT face=宋体>电动机负荷较轻时，软起动器可自动降压，以此提高电动机功率因数。<SPAN lang=EN-US><o:p></o:p></SPAN></FONT></FONT></P>
<P style="TEXT-INDENT: 18pt"><FONT size=2><FONT face=宋体><B><SPAN lang=EN-US>4、软停车</SPAN></B><SPAN lang=EN-US><o:p></o:p></SPAN></FONT></FONT></P>
<P style="TEXT-INDENT: 18pt"><FONT size=2><FONT face=宋体>在不希望电动机突然停车的场合，可以通过软停车方式来逐步降低电动机端电压。<SPAN lang=EN-US><o:p></o:p></SPAN></FONT></FONT></P>
<P style="TEXT-INDENT: 18pt"><FONT size=2><FONT face=宋体><B><SPAN lang=EN-US>5、泵停车</SPAN></B><SPAN lang=EN-US><o:p></o:p></SPAN></FONT></FONT></P>
<P style="TEXT-INDENT: 18pt"><FONT size=2><FONT face=宋体>对惯性力矩较小的泵，软起动器在起动和停机过程中，实时检测电动机的负载电流，根据泵的负载和速度特性调节输出电压，消除“水锤效应”。<SPAN lang=EN-US><o:p></o:p></SPAN></FONT></FONT></P>
<P style="TEXT-INDENT: 18pt"><FONT size=2><FONT face=宋体><B><SPAN lang=EN-US>6、动力制动</SPAN></B><SPAN lang=EN-US><o:p></o:p></SPAN></FONT></FONT></P><SPAN style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-size: 12.0pt; mso-font-kerning: 1.0pt; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">在惯性力矩大的负载或需要快速停机的场合，可以向电动机输入直流电，以实现快速制动。</SPAN><SPAN style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-bidi-font-size: 12.0pt; mso-fareast-font-family: 宋体; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA"> </SPAN></DIV></div>
			<div class="author_text">时间:2008-6-30</div>
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