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d.innerHTML = d.innerHTML + '<a class=\"download_word download_word_lb\" href=\"javascript:;\" id=\"vipdown\" onclick=\"showpay(2)\"><div class=\"download_card\"><div class=\"card_nr card_nr_lb\"><h4 class=\"card_bt\">步进电动机的工作原理</h4><div class=\"download_card_msg\">&ensp;&ensp;&ensp;&ensp; 
&ensp;&ensp;&ensp;&ensp;步进电机在工作时，需由专用的驱动电源将脉冲信号电压按一定的顺序轮流加到定子的各相绕组上。驱动电源主要由脉冲分配器和脉冲放大器两部分组成。 
。下面小编给大家分享步进电动机的工作原理，希望能帮助到大家。 步进电动机的工作原理文档下载网址链接：</div></div><div class=\"download_card_btn download_card_btn_lb\"><div class=\"content_box_tj\"><span>推荐度：</span><img src=\"/skin/zhann/images/icon_star.png\" alt=\"\">	<img src=\"/skin/zhann/images/icon_star.png\" alt=\"\">	<img src=\"/skin/zhann/images/icon_star.png\" alt=\"\">	<img src=\"/skin/zhann/images/icon_star.png\" alt=\"\"></div><div class=\"downlod_btn_right demo_tc downlod_btn_right_lb\"><em class=\"downlod_icon\"></em>点击下载文档<span>文档为doc格式</span></div> </div></div></a>';
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