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style="text-align:left"><span style="font-size:12px;font-family:'Arial','sans-serif';color:#848484"><span style="font-family:宋体;color:#848484;text-underline:none">船形铝壳电阻</span></span><span style="font-size:12px;font-family:宋体;color:#848484">器</span></p><p style=";margin-bottom:0;background:white"><span style="font-size:12px;font-family:'Arial','sans-serif';color:#848484"><span style="font-family: 宋体;color:#848484;text-underline:none">超薄铝壳电阻</span></span><span style="font-size:12px;color:#848484">器</span></p><h3 style="margin-top:0;margin-right:0;margin-bottom:4px;margin-left: 0;line-height:22px;background:white"><span style="font-size:12px;color:#848484;font-weight:normal">常见驱动技术（变频器、伺服驱动器、动力模块、自动化控制、工业机器人、</span><span style="font-size:12px;font-family:'Arial','sans-serif';color:#848484;font-weight:normal"><span style="font-family:宋体;color:#848484;text-underline:none">纯电动汽车</span></span><span style="font-size:12px;color:#848484">）</span></h3><p style="text-align:left"><span style="font-size:12px;font-family:宋体;color:#848484">此产品可选配：</span></p><p style=";margin-bottom:0;background:white"><span style="font-size:12px;color:#848484">端子或引线</span><span style="font-size:12px;font-family:'Arial','sans-serif';color:#848484">500mm,</span><span style="font-size:12px;color:#848484">可增减电缆长度需求</span></p><p style=";margin-bottom:0;background:white"><span style="font-size:12px;color:#848484">欧姆值超出范围定制</span></p><p style=";margin-bottom:0;background:white"><span style="font-size:12px;color:#848484">电阻特殊公差（</span><span style="font-size:12px;font-family:'Arial','sans-serif';color:#848484">10%</span><span style="font-size:12px;color:#848484">，</span><span style="font-size:12px;font-family:'Arial','sans-serif';color:#848484">5%</span><span style="font-size:12px;color:#848484">，</span><span style="font-size:12px;font-family:'Arial','sans-serif';color:#848484">2</span><span style="font-size:12px;color:#848484">％，</span><span style="font-size:12px;font-family:'Arial','sans-serif';color:#848484">1</span><span style="font-size:12px;color:#848484">％）</span></p><p><span style="font-size:12px;font-family:宋体;color:#848484">电阻值范围和额定功率非常宽，按需定制，陶瓷支架上的绕线电阻器浸没在石英砂中并放置在阳极氧化的铝外壳中；增加云母片能更好的绝缘和支撑；密封由硅氧烷弹性体组合完成，达到</span><span style="font-size:12px;font-family:'Arial','sans-serif';color:#848484">IP20~IP68</span><span style="font-size:12px;font-family: 宋体;color:#848484">防护等级，</span><span style="font-size:12px;font-family:'Arial','sans-serif';color:#848484">IP68</span><span style="font-size:12px;font-family:宋体;color:#848484">等级设计定制，防水防潮，寿命长久稳固耐用</span></p><p><span style="font-size:12px;font-family:宋体;color:#848484">耐高温黑色硅胶电线（可定制耐高温白色编织电缆）：高品质耐高温</span><span style="font-size:12px;font-family:'Arial','sans-serif';color:#848484">200</span><span style="font-size:12px;font-family:宋体;color:#848484">℃硅胶电线（编织），专业设备焊接配接线引出端子，无脱落，无变形；专业设备标识电缆标记。</span></p><p><span style="font-size:12px;font-family:宋体;color:#848484">优质低温漂合金电阻丝，温度系数低至</span><span style="font-size:12px;font-family:'Arial','sans-serif';color:#848484">25PPM</span><span style="font-size:12px;font-family: 宋体;color:#848484">：精选采用高于传统市场</span><span style="font-size:12px;font-family:'Arial','sans-serif';color:#848484">1.2</span><span style="font-size:12px;font-family:宋体;color:#848484">倍以上优质合金电组丝均匀绕制陶瓷电阻芯，更耐冲击、更高性能、更高稳定</span></p><p><span style="font-size:12px;font-family:宋体;color:#848484">高温黑胶固定电线：防止松动、电缆磨损，工艺美观</span></p><p><span style="font-size:12px;font-family:宋体;color:#848484">高纯度、高密度、高白度低杂质原砂石英砂：精选高纯度、高密度、高白度、低杂质原砂石英砂，使电阻具有高密封，高绝缘、高散热，高抗震持性</span></p><p><span style="font-size:12px;font-family:宋体;color:#848484">散热沟槽设计：加厚</span><span style="font-size:12px;font-family:'Arial','sans-serif';color:#848484">6063</span><span style="font-size:12px;font-family:宋体;color:#848484">工业铝材自带散热沟槽设计</span><span style="font-size:12px;font-family:'Arial','sans-serif';color:#848484">15μ</span><span style="font-size:12px;font-family:宋体;color:#848484">阳极氧化处理，可根据特殊要求满足</span><span style="font-size:12px;font-family:'Arial','sans-serif';color:#848484">-55C</span><span style="font-size:12px;font-family:宋体;color:#848484">至</span><span style="font-size:12px;font-family:'Arial','sans-serif';color:#848484">375</span><span style="font-size:12px;font-family:宋体;color:#848484">℃</span><span style="font-size:12px;font-family:'Arial','sans-serif';color:#848484">C</span><span style="font-size:12px;font-family:宋体;color:#848484">高温恶劣工况环境运行</span></p><p style="text-align:left"><span style="font-size:12px;font-family:'Arial','sans-serif';color:#848484"> </span><span style="font-size:12px;font-family:宋体;color:#848484">线绕</span><span style="font-size:12px;font-family:'Arial','sans-serif';color:#848484"><span style="font-family:宋体;color:#848484;text-underline:none">波纹电阻</span></span></p><p style="text-align:left"><span style="font-size:12px;font-family:'Arial','sans-serif';color:#848484"> <span style="font-family: 宋体;color:#848484;text-underline:none">制动电阻</span></span></p><p style="text-align:left"><span style="font-size:12px;font-family:'Arial','sans-serif';color:#848484"> <span style="font-family: 宋体;color:#848484;text-underline:none">刹车电阻</span></span></p><p style="text-align:left"><span style="font-size:12px;font-family:'Arial','sans-serif';color:#848484"> </span><span style="font-size:12px;font-family:宋体;color:#848484">充放电电阻</span></p><p><span style="font-size:12px;font-family:'Arial','sans-serif';color:#848484"> <span style="font-family:宋体;color:#848484;text-underline:none">制动电阻箱</span></span></p><p><span style="font-size:12px;font-family:'Arial','sans-serif';color:#848484"> </span><span style="font-size:12px;font-family:宋体;color:#848484">功率电阻柜</span></p><p><span style="font-size:12px;font-family:'Arial','sans-serif';color:#848484"> </span><span style="font-size:12px;font-family:宋体;color:#848484">阻性负载测试柜</span></p><p><span style="font-size:12px;font-family:宋体;color:#848484">陶瓷管型</span><span style="font-size:12px;font-family:'Arial','sans-serif';color:#848484"><span style="font-family:宋体;color:#848484;text-underline:none">线绕电阻器</span></span><span style="font-size:12px;font-family:宋体;color:#848484">将固定圈数电阻合金线材成形于陶瓷管上，电阻器功率大且坚固，耐高温、散热性优，电阻温度系数小、呈直线变化，适合大电流做短时间过负载时使用，适用于电动机启动、负载测试、产业机械、电力分配、仪器设备及自动控制装置等。</span></p><p><span style="font-size:12px;font-family:'Arial','sans-serif';color:#848484"> </span></p><p><span style="font-size:12px;font-family:'Arial','sans-serif';color:#848484"><span style="font-family:宋体;color:#848484;text-underline:none">预充电阻和放电电阻在电动汽车的应用</span></span><span style="font-size:12px;font-family:宋体;color:#848484">（<strong>转载：电动汽车资源网）</strong></span></p><p><span style="font-size:12px;font-family:'Arial','sans-serif';color:#848484"><span style="font-family:宋体;color:#848484;text-underline:none">预充电阻</span></span><span style="font-size:12px;font-family:宋体;color:#848484">和放电电阻：在充电过程中，电源提供的能量有一半将转变为电场能量储存在电容中，另一半则为电阻所消耗，预充电过程中在充电回路串联预充电电阻</span></p><p><span style="font-size:12px;font-family:宋体;color:#848484">预充电路是指在电路中先于主电路投入工作的充电电路。其作用是为主电路的稳定工作提供足够的时间和准备。而预充电阻是在整车高压上电初期对电容进行缓慢充电的电阻，如果没有预充电阻，当高压串联回路吸合瞬间，高压会直接施加在电容上，而电容此时是没有能量的，即电容处于允许充电的状态，根据电容器的特征可知，此时会产生瞬时大电流击穿继电器等高压回路上的</span><span style="font-size:12px;font-family:'Arial','sans-serif';color:#848484"><span style="font-family:宋体;color:#848484;text-underline:none">电气件</span>;</span><span style="font-size:12px;font-family:宋体;color:#848484">所以，设计高压回路时需要引入预充电阻确保高压电路安全。预充电阻的类型有水泥电阻（陶瓷电阻），铝壳黄金绕线电阻）、功率电阻（铝壳梯形电阻）</span></p><p><span style="font-size:12px;font-family:宋体;color:#848484">在电路闭合瞬间，电容器相当于</span><span style="font-size: 12px;font-family:'Arial','sans-serif';color:#848484"><span style="font-family:宋体;color:#848484;text-underline:none">直接短路</span></span><span style="font-size:12px;font-family:宋体;color:#848484">，而此时负载电阻仅仅是导线和继电器触点的电阻约为</span><span style="font-size:12px;font-family:'Arial','sans-serif';color:#848484">5m</span><span style="font-size:12px;font-family:宋体;color:#848484">Ω。</span><span style="font-size:12px;font-family:'Arial','sans-serif';color:#848484">400V</span><span style="font-size:12px;font-family:宋体;color:#848484">动力电池平台为例，会有</span><span style="font-size:12px;font-family:'Arial','sans-serif';color:#848484">400V</span><span style="font-size:12px;font-family:宋体;color:#848484">左右的电压，对上</span><span style="font-size:12px;font-family:'Arial','sans-serif';color:#848484">5m</span><span style="font-size:12px;font-family:宋体;color:#848484">Ω的电阻，瞬时电流约为</span><span style="font-size:12px;font-family:'Arial','sans-serif';color:#848484">80000A</span><span style="font-size:12px;font-family: 宋体;color:#848484">，非常大，这么大的电流如不加以限制将对继电器，负载用电器造成巨大冲击而导致损伤。因此电动汽车的电源系统必须加上</span><span style="font-size:12px;font-family:'Arial','sans-serif';color:#848484"><span style="font-family:宋体;color:#848484;text-underline:none">预充电电路</span></span><span style="font-size:12px;font-family:宋体;color:#848484">。减小上电时的冲击电流，保护高压电气件。</span></p><h2 style="background:white"><span style="font-size:12px;line-height:173%;font-family:宋体;color:#848484;font-weight:normal">预充电阻选型</span></h2><p style="margin-top:0;margin-right:0;margin-bottom:15px;margin-left: 0;text-indent:32px;line-height:32px;background:white"><span style="font-size:12px;color:#848484">根据公式</span><span style="font-size:12px;font-family:'Arial','sans-serif';color:#848484">Vc=E(1-e-(t/R*C))</span></p><p style="margin-top:0;margin-right:0;margin-bottom:15px;margin-left: 0;text-indent:32px;line-height:32px;background:white"><span style="font-size:12px;font-family:'Arial','sans-serif';color:#848484">Vc</span><span style="font-size:12px;color:#848484">为预充电容两端电压</span><span style="font-size:12px;font-family:'Arial','sans-serif';color:#848484">,E</span><span style="font-size:12px;color:#848484">为动力电池两端电压</span><span style="font-size:12px;font-family:'Arial','sans-serif';color:#848484">,C</span><span style="font-size:12px;color:#848484">为预充总电容</span><span style="font-size:12px;font-family:'Arial','sans-serif';color:#848484">,t</span><span style="font-size:12px;color:#848484">为充电时间</span><span style="font-size:12px;font-family:'Arial','sans-serif';color:#848484">,R</span><span style="font-size:12px;color:#848484">为预充电阻。由上式计算出预充电电阻</span><span style="font-size:12px;font-family:'Arial','sans-serif';color:#848484">R</span><span style="font-size:12px;color:#848484">和预充电时间</span><span style="font-size:12px;font-family:'Arial','sans-serif';color:#848484">t</span><span style="font-size:12px;color:#848484">。给出预充电阻值或预充时间</span><span style="font-size:12px;font-family:'Arial','sans-serif';color:#848484">,</span><span style="font-size:12px;color:#848484">预充电时间</span><span style="font-size:12px;font-family:'Arial','sans-serif';color:#848484">t</span><span style="font-size:12px;color:#848484">或预充电阻</span><span style="font-size:12px;font-family:'Arial','sans-serif';color:#848484">R</span><span style="font-size:12px;color:#848484">可以根据公式算出</span></p><p><span style="font-size:12px;font-family:'Arial','sans-serif';color:#848484"> </span></p><p style="margin-top:0;margin-right:0;margin-bottom:15px;margin-left: 0;text-indent:32px;line-height:32px;background:white"><span style="font-size:12px;color:#848484">泄放回路中电阻：</span></p><p style="margin-top:0;margin-right:0;margin-bottom:15px;margin-left: 0;text-indent:32px;line-height:32px;background:white"><span style="font-size:12px;color:#848484">根据公式</span><span style="font-size:12px;font-family:'Arial','sans-serif';color:#848484">Vc=E* e-(t/R*C)</span></p><p style="margin-top:0;margin-right:0;margin-bottom:15px;margin-left: 0;text-indent:32px;line-height:32px;background:white"><span style="font-size:12px;font-family:'Arial','sans-serif';color:#848484">Vc=36V(</span><span style="font-size:12px;color:#848484">安全电压</span><span style="font-size:12px;font-family:'Arial','sans-serif';color:#848484">),E</span><span style="font-size:12px;color:#848484">为动力电池两端电压</span><span style="font-size:12px;font-family:'Arial','sans-serif';color:#848484">,C</span><span style="font-size:12px;color:#848484">为高压回路总电容值</span><span style="font-size:12px;font-family:'Arial','sans-serif';color:#848484">,t</span><span style="font-size:12px;color:#848484">为放电时间</span><span style="font-size:12px;font-family:'Arial','sans-serif';color:#848484">,R</span><span style="font-size:12px;color:#848484">为放电电阻。由式</span><span style="font-size:12px;font-family:'Arial','sans-serif';color:#848484">2</span><span style="font-size:12px;color:#848484">计算出放电电阻</span><span style="font-size:12px;font-family:'Arial','sans-serif';color:#848484">R</span><span style="font-size:12px;color:#848484">和放电时间</span><span style="font-size:12px;font-family:'Arial','sans-serif';color:#848484">t</span><span style="font-size:12px;color:#848484">。</span></p><p style="margin-top:0;margin-right:0;margin-bottom:15px;margin-left: 0;text-indent:32px;line-height:32px;background:white"><br/></p><p style="margin-top:0;margin-right:0;margin-bottom:15px;margin-left: 0;text-indent:32px;line-height:32px;background:white"><img src="/uploads/allimg/20241212/1733980754407637.png" title="1733980754407637.png" alt="微信图片_20241212131649.png" width="845" height="503" style="width: 845px; height: 503px;"/></p><p style="text-indent:32px;line-height:32px;background:white"><span style="font-size:12px;color:#848484">预充电阻和预充时间的确定</span></p><p style="text-indent:32px;line-height:32px;background:white"><span style="font-size:12px;color:#848484">为了避免内含较大容量电容的用电设备在上电时产生大电流冲击高压用电器、高压接触器和高压熔断器，设计了预充电回路，但是选择多大的预充电阻和控制多长的预充电时间，还需要经过科学的计算，如式</span><span style="font-size:12px;font-family:'Arial','sans-serif';color:#848484">3-3</span><span style="font-size:12px;color:#848484">所示，为预充电回路设计的理论计算依据。</span></p><p style="text-indent:32px;line-height:32px;background:white"><span style="font-size:12px;color:#848484">根据公式</span><span style="font-size:12px;font-family:'Arial','sans-serif';color:#848484"> Vc=E(1-e-(t/R*C))</span><span style="font-size:12px;color:#848484">……………………</span><span style="font-size:12px;font-family:'Arial','sans-serif';color:#848484">.(</span><span style="font-size:12px;color:#848484">式</span><span style="font-size:12px;font-family:'Arial','sans-serif';color:#848484"> 3-3)</span></p><p style="text-indent:32px;line-height:32px;background:white"><span style="font-size:12px;color:#848484">式</span><span style="font-size:12px;font-family:'Arial','sans-serif';color:#848484"> 3-3</span><span style="font-size:12px;color:#848484">中，</span><span style="font-size:12px;font-family:'Arial','sans-serif';color:#848484">Vc</span><span style="font-size:12px;color:#848484">为预充电容两端电压，</span><span style="font-size:12px;font-family:'Arial','sans-serif';color:#848484">E</span><span style="font-size:12px;color:#848484">为动力电池两端电压，</span><span style="font-size:12px;font-family:'Arial','sans-serif';color:#848484">C</span><span style="font-size:12px;color:#848484">为预充总电容，</span><span style="font-size:12px;font-family:'Arial','sans-serif';color:#848484">t</span><span style="font-size:12px;color:#848484">为充电时间，</span><span style="font-size:12px;font-family:'Arial','sans-serif';color:#848484">R</span><span style="font-size:12px;color:#848484">为预充电阻。</span></p><p style="text-indent:32px;line-height:32px;background:white"><span style="font-size:12px;color:#848484">由上式计算出充电电阻</span><span style="font-size:12px;font-family:'Arial','sans-serif';color:#848484">R</span><span style="font-size:12px;color:#848484">和预充电时间</span><span style="font-size:12px;font-family:'Arial','sans-serif';color:#848484"> t</span><span style="font-size:12px;color:#848484">。</span></p><p style="text-indent:32px;line-height:32px;background:white"><span style="font-size:12px;color:#848484">放电电阻和时间的确定</span></p><p style="text-indent:32px;line-height:32px;background:white"><span style="font-size:12px;color:#848484">同理，在高压系统下电后，那些内部含有大容量电容的高压用电设备还储存有大量的电能，对整车和人员的安全产生极大的危险，所以需要设计放电电路泄放掉大容量电容内的电能，一般要求高压用电设备自带泄放回路，但安装不满这一要求用电设备的车辆，就需要单独设计泄放回路，泄放回路中电阻和时间的确定也是有科学的理论计算依据的，如</span><span style="font-size:12px;font-family:'Arial','sans-serif';color:#848484">3.4</span><span style="font-size:12px;color:#848484">式。</span></p><p style="text-indent:32px;line-height:32px;background:white"><span style="font-size:12px;color:#848484">根据公式</span><span style="font-size:12px;font-family:'Arial','sans-serif';color:#848484">Vc=E* e-(t/R)</span><span style="font-size:12px;color:#848484">………………………………………</span><span style="font-size:12px;font-family:'Arial','sans-serif';color:#848484">(</span><span style="font-size:12px;color:#848484">式</span><span style="font-size:12px;font-family:'Arial','sans-serif';color:#848484">3-4)</span></p><p style="text-indent:32px;line-height:32px;background:white"><span style="font-size:12px;color:#848484">式</span><span style="font-size:12px;font-family:'Arial','sans-serif';color:#848484"> 3-4 </span><span style="font-size:12px;color:#848484">中，</span><span style="font-size:12px;font-family:'Arial','sans-serif';color:#848484">Vc=36V(</span><span style="font-size:12px;color:#848484">安全电压</span><span style="font-size:12px;font-family:'Arial','sans-serif';color:#848484">)</span><span style="font-size:12px;color:#848484">，</span><span style="font-size:12px;font-family:'Arial','sans-serif';color:#848484">E</span><span style="font-size:12px;color:#848484">为动力电池两端电压，</span><span style="font-size:12px;font-family:'Arial','sans-serif';color:#848484">C</span><span style="font-size:12px;color:#848484">为高压回路总电容值，</span><span style="font-size:12px;font-family:'Arial','sans-serif';color:#848484">t</span><span style="font-size:12px;color:#848484">为放电时间，</span><span style="font-size:12px;font-family:'Arial','sans-serif';color:#848484">R</span><span style="font-size:12px;color:#848484">为放电电阻。</span></p><p style="margin-top:0;margin-right:0;margin-bottom:15px;margin-left: 0;text-indent:32px;line-height:32px;background:white"><span style="font-size:12px;color:#848484">由式</span><span style="font-size:12px;font-family:'Arial','sans-serif';color:#848484"> 3-4 </span><span style="font-size:12px;color:#848484">计算出放电电阻</span><span style="font-size:12px;font-family:'Arial','sans-serif';color:#848484">R</span><span style="font-size:12px;color:#848484">和放电时间</span><span style="font-size:12px;font-family:'Arial','sans-serif';color:#848484">t</span><span style="font-size:12px;color:#848484">。</span></p><p><br/></p>_key"> <div class="rt_bot_line"> </div> <div class="age_con_key2"> 访问量：<span id="cntrHits"><script src="{dede:field name='phpurl'/}/count.php?view=yes&aid={dede:field name='i/plusmid'/}" 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