一种快速响应电磁铁的动态过程研究

快速响应电磁铁是在脉冲电压驱动下,周期性伸缩运动的机构。本文研究的样机为一台应用在燃油泵中的开关执行元件,控制燃油泵阀门周期性地快速开启与关闭。该电磁铁推力560 N以上,动作周期为100 ms。通过理论分析与有限元仿真,对电磁铁从通电到衔铁动作,断电到衔铁缩回这一动态过程进行了研究,并将试验结果与仿真结果进行对比。研究了弹簧弹力对吸合时间的影响,脉冲电压的周期和占空比对输出推力的影响,以及电磁铁电路对释放时间的影响。     

超快速高可靠过电压保护器

使用“金属－电双稳材料－金属”的夹层结构（结点）可制成电压灵敏的保护单元,而使用多个并联结点构成的保护器可保证安全系数大大提高。本文报道了我们发现的、在室温时即具有电双稳性能的单有机材料ＰＡＲ,与铝膜一起构成的保护器原型（ｐｒｏｔｏｔｙｐｅ）在１００个结点的情况下得到阈值电压为６伏、反应时间为数十纳秒和安全系数为１００％的测试结果。因此可满足高级电信设备和机载仪器防止浪涌电压或随机感应电压的需求。     

直流恒力电磁铁特性

电磁铁成本低、结构简单、结实坚固,在某些应用场合,为了改善其控制特性,希望采用恒力(或准恒力)特性的电磁铁.为了设计制作这种电磁铁,须解决两个基本问题:采用什么结构方案;主要尺寸应满足什么条件.针对上述两个问题,提出两种圆柱形直流电磁铁结构一盆形极面和锥形极面结构,在简化的等值磁路方法和分析磁路总磁导的基础上,导出产生恒力特性时电磁铁各主要尺寸之间的解析关系,分析各主要参数对力特性的综合影响.解析分析的结论可为进一步电磁场数值方法精确计算和试验研究提供初步的优选设计方案.解析计算结果与采用ANSOFT有限元电磁场软件计算的结果进行对比,证实所提出的方法和结论是正确的,对于恒力特性直流电磁铁的研发和设计是一种简便、适用的方法.     

电磁铁涡流制动分析与设计

介绍了电磁铁涡流制动的工作原理.通过建立二维电磁场分析模型,对涡流制动系统进行了电磁场数学分析,推导并求解出了制动力和运行速度之间的关系表达式.同时,利用ANSYS有限元分析软件建立了电磁铁分析模型,通过改变励磁电流、气隙厚度、导轨厚度来求得这些参数对制动力和吸引力的影响,从而为涡流制动系统设计提供了依据.     

耐淤泥水下电磁铁研究

水下电磁铁是水下操纵电动执行元件。受水下供电电源的限制，一般选用直流电磁铁。普通直流电磁铁的起始吸力小，吸力特性曲线较陡，不能满足水下操纵要求。为此，通过对直流电磁铁吸力特性的研究，对电磁铁铁心结构进行改进，设计出了准恒吸力直流电磁铁。为了防止水和泥沙等进入内腔，利用液压油压缩比小、能够润滑的特点，在腔内装满液压油，达到了防水、耐压、耐淤泥等效果。经过近4年的小浪底水库现场试用，这种耐淤泥水下电磁铁未发生过任何故障现象，说明该方案具有很高的可靠性。文章介绍了耐淤泥水下电磁铁的组成结构、吸力特性及其防水防沙密封措施。     

超音频快速热传导技术在泵加工中的应用

本文根据超音频快速热传导的特点,对新型恒压变量径向柱塞泵进行了热处理,结果表明,用快速热传导技术可对薄壁小工件的内孔进行局部淬火。     

高速开关数字阀的电磁铁设计

从高速开关数字阀中的电磁技术理论出发,研究了高速开关数字阀中的软磁合金材料的选用原则,计算了电磁铁设计的尺寸,给出了整个电磁铁的设计结构和电磁铁部分装配元件清单.     

准恒力电磁铁的吸力特性研究

阐述了有限元法在电磁场数值分析中的应用。为此首先建立了630 kN多点成形机用电磁铁的数学模型,并用Maxwell应力张量法求解电磁铁的牵引力。对电磁铁进行较大改进,得到了电磁场的等磁力线及动铁心的吸力分布曲线,同时得到了最大吸力与工作吸力之比为2.3的准恒力电磁铁。     

比例电磁铁可靠性研究

本文首先对ＭＦＥ１－５５ＹＣ液压阀用比例电磁铁进行故障模式与影响分析（ＦＭＥＡ），找到了影响其可靠性的重要零件。通过对重要零件分别进行可靠性试验和试验数据的统计分析，确定了比例电磁铁失效分布规律和固有可靠性指标，建立了其加速寿命试验方程，并且提供了比例电磁铁失效原因和改善其可靠性的方法。     

大学生“和谐管理”简论

“和谐管理”是人本的、道德的、柔性的、民主的管理。运用“和谐管理”理念对大学生实施教育和管理是创建和谐高校、构建和谐社会的必然选择。大学生“和谐管理”必须实现从注重“物本管理”到注重“人本管理”、从注重“他律管理”到注重“自律管理”、从注重“刚性管理”到注重“柔性管理”、从注重“科层管理”到注重“民主管理”的四大转变。     

Brief Introduction on Magazine

<正>The magazine Machinery Design and Manufacture,which started its initial publication and issue both at home and abroad in 1963,is a kind of periodical science magazine in mechanical industrial area.In decades,the magazine which is published over 20,000copies per issue attracts and forms a large number of readership and writers from science and research institute,     

Brief Introduction on Magazine

正The magazine Machinery Design and Manufacture,which started its initial publication and issue both at home and abroad in 1963,is a kind of periodical science magazine in mechanical industrial area. In decades,the magazine which is published over 20,000 copies per issue attracts and forms a large number of readership and writers from science and research institute,design department and manufacturing department in heavy industrial field. Being an influential magazine in our country,the magazine has been honored many times by the jurisdiction bureau. The magzine is included in CSSCI,CSTPCD,CAJED,CJN,CAJ,Chinainfo,source journal of CNKI,source journal of CSA.     

Brief Introduction on Magazine

正The magazine Machinery Design and Manufacture,which started its initial publication and issue both at home and abroad in 1963,is a kind of periodical science magazine in mechanical industrial area. In decades,the magazine which is published over 20,000copies per issue attracts and forms a     

Brief Introduction on Magazine

<正>The magazine Machinery Design and Manufacture,which started its initial publication and issue both at home and abroad in 1963,is a kind of periodical science magazine in mechanical industrial area. In decades,the magazine which is published over 20,000copies per issue attracts and forms a large number of readership and writers from science and research institute,design department and manufacturing department in heavy industrial field.Being an influential magazine in our country,the magazine has been honored many times by the jurisdiction bureau.     

全自动钢带式证卡层合机简介

介绍了一种全自动钢带式证卡层合机，该层合机可以实现装盒、上料、下料全过程的自动化作业，并且机械结构简单、操作维护方便、体积小、重量轻、制造成本低、功率消耗少，便于在制卡行业应用和推广。     

Brief Introduction on Magazine

正The magazine Machinery Design and Manufacture,which started its initial publication and issue both at home and abroad in 1963,is a kind of periodical science magazine in mechanical industrial area. In decades,the magazine which is published over 20,000copies per issue attracts and forms a large number of readership and writers     

Brief Introduction on Magazine

<正>The magazine Machinery Design and Manufacture,which started its initial publication and issue both at home and abroad in 1963,is a kind of periodical science magazine in mechanical industrial area.In decades,the magazine which is published over 20,000copies per issue attracts and forms a large number of readership and writers from science and research institute,design department and manufacturing department in heavy industrial field.     

Brief Introduction on Magazine

<正>The magazine Machinery Design and Manufacture,which started its initial publication and issue both at home and abroad in 1963,is a kind of periodical science magazine in mechanical industrial area.In decades,the magazine which is published over 20,000copies per issue attracts and forms a large number of readership and writers from science and research institute,design department and manufacturing department in heavy industrial field.     

Brief Introduction on Magazine

<正>The magazine Machinery Design and Manufacture,which started its initial publication and issue both at home and abroad in 1963,is a kind of periodical science magazine in mechanical industrial area. In decades,the magazine which is published over 20,000copies per issue attracts and forms a large number of readership and writers from science and research institute,