共查询到11条相似文献,搜索用时 54 毫秒
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采用快速后减模控制系统的大拉机设计与研究 总被引:1,自引:0,他引:1
介绍了采用快速后减模控制系统的DL400系列铜铝大拉机的机械及电气控制原理和设计方案,重点论述了该快速后减模控制系统的设计特点及实现原理和DL400系列大拉机及其配套部分在设计时注意到的一些问题。 相似文献
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本文用低、微滑动理论对国外两种大拉机的技术参数进行剖析和验证,说明国外已普遍采用了滑动量很低的拉线机。最后建议我国应迅速研究开发这类新型的系列产品。 相似文献
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这也许是一个老话题,但是,却关乎着一个行业的兴衰,关乎着亿万人们的身心健康,绝不可以掉以轻心。但是千论万论不离其宗,归结起来只有两个字"实用"。"实用"这里面包括两个内容:第一,就是完成吸油烟机(以下简称烟机)出生以来的初衷,即排净人们司厨过程产生的油烟废气;第二,就是性价比,即在保证前一条件下费用相对低,其中包括售价、使用、维护、时效。所以,只要能满足以上两条要求的烟机才是人们所需要的,同时也是烟机研发的方向,也是烟机发展的方向。 相似文献
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滑动(水箱)式多模拉丝新原理概要 总被引:1,自引:0,他引:1
本文是笔者研究滑动式拉丝所写十余篇论文的综合性介绍。文章简略评述了传统理论的失误 ,提出了一套完整的新原理 ,使用了与传统理论完全不同的计算公式 ,彻底探明了滑动的客观规律 ,并提出了一系列新概念和新观点。 相似文献
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本文针对 L HT- 12 0 /17拉丝机中润滑油与皂化液互渗 ,以及漏油现象进行分析 ,并提出了改进措施 ,提高了成品丝的表面质量 ,减少了模具的磨损 ,节约了润滑油和皂化液的用量 ,降低了生产成本 ,有明显的经济效益。 相似文献
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Toshihiko Tanaka Shinji Fujikawa Shigeyuki Funabiki 《Electrical Engineering in Japan》2003,144(2):53-62
This paper proposes a new method of damping harmonic resonance in the DC link of a large‐capacity rectifier‐inverter system, such as in rapid‐transit railways. A voltage‐source PWM converter is connected in series to the DC capacitor of the rectifier through a matching transformer, acting as a damping resistor to the DC capacitor current. No filters are needed to extract harmonic components from the DC capacitor current. This results in a quick response and highly stable damping. The relationship between the control gain of the PWM converter and the required rating is theoretically discussed. We show that the required rating is less than one‐thousandth of that previously proposed. In particular, regenerating the power consumed by the PWM converter is very important because of the large power in practical systems. Normally, an additional PWM inverter is connected to the DC bus of the PWM converter to regenerate the consumed power. The additional inverter regenerates the DC power to the AC source through a transformer. This method, however, makes the damping circuit complex, thus the proposed method for the DC‐link harmonic resonance is less practicable. In this paper, a simple and novel scheme that utilizes the DC‐link voltage of the rectifier as a DC source for the PWM converter is proposed. The excellent practicability of the proposed damping method with the novel regenerating scheme is confirmed using digital computer simulation. © 2003 Wiley Periodicals, Inc. Electr Eng Jpn, 144(2): 53–62, 2003; Published online in Wiley InterScience ( www.interscience.wiley.com ). DOI 10.1002/eej.10172 相似文献