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贾淳 《工程设计与研究(长沙)》1998,(3):39-42
阐述笼型感应电动机全压起动的优点及条件,讨论了影响电动机起动的因素。对几种降压起动方式进行了分析比较,以便合理选择。对绕线转子电动机的起动方式及应用范围进行了说明。 相似文献
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伴随着经济的快速发展,冶金、矿山等产业规模也不断的壮大,而大功率高压电动机在工业生产中所占的比例也越来越大,能否成功地保证高压电动机起动和可靠运行就显得十分重要,直接关系到企业的经济效益。文章以某钢厂为样本,分析比较了高压电动机常用的几种起动方式。 相似文献
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异步电动机的起动方式直接影响着电网的稳定运行,文中介绍了鼠笼式异步电动机常用的起动方式及它们的特点,并进行了比较全面的技术比较,分析了他们各自的优缺点及适应场所,为实际应用提供了科学的理论依据。 相似文献
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制氧站大型电机起动方式简介 总被引:1,自引:0,他引:1
结合两座新建的制氧站工程,简要介绍了制氧站大型电机用电的特点及其常用的几种起动方式,并对制氧站大型电机的几种起动方式的优缺点进行了比较。 相似文献
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通过比较几种降压起动方式的比较,介绍了大型异步电动机全压及降压起动方式的选择,着重阐述了河南分公司4#空压机的降压设计的设计过程。 相似文献
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设计工作中,经常碰到带有高压鼠笼型电动机的供配电系统。如何选择电动机的起动方式,以及继电保护整定值能否满足灵敏度系数的要求,尤其在小容量的系统中,根据经验来判断往往显得不太可靠,应该通过计算予以确定。现以南京某钢铁厂转炉炼钢车间由6KV开关站内母线直接供电的风机用高压鼠笼型电动机为例,叙述其起动方式选择、继电保护整定及灵敏度系数校验的计算过程。 相似文献
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鼠笼型异步电动机的软起动技术 总被引:3,自引:0,他引:3
普通结构的三相鼠笼型异步电机直接起动时起动电流很大,为避免对电网和负载设备造成冲击,采取了种种软起动方法,重点叙述了固态软起动法、变频器软起动法这两种新的起动方式及其应用。 相似文献
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B-DP节电优化装置在电动机中的应用 总被引:1,自引:0,他引:1
本文分析了B-DP电动机节电优化装置的特点、性能及参数,结合矿山设备电动机的实际工况,阐述了该装置在矿山设备中的应用实践及效果。 相似文献
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激光加工代表着当今材料加工业的发展方向,具有其他加工方法所不可比拟的特点。文章对激光加工技术理论进行了简述,并对在马钢成功的实践案例进行了描述。 相似文献
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The development of some dual-phase steel structures from different starting microstructures 总被引:1,自引:0,他引:1
Xue-Ling Cai A. J. Garratt-Reed W. S. Owen 《Metallurgical and Materials Transactions A》1985,16(4):543-557
The development of dual-phase structures with different morphologies has been studied in detail by intercritical annealing
specimens of a steel containing 0.11 pct C and 1.6 pct Mn with different microstructures before annealing. The kinetics of
formation of the two-phase structure at the annealing temperature and the redistribution of substitutional solute elements
were measured in specimens quenched from the intercritical annealing temperature. The structure before annealing was either
banded ferrite-pearlite, homogenized ferrite-pearlite, lath martensite, spheroidal cementite dispersed in ferrite, or austenite.
No measurable partitioning of silicon or molybdenum, present in the steel in small concentrations, was found. However, close
to equilibrium partitioning of manganese occurred on annealing specimens with either a ferrite-pearlite or a lath martensite
structure, but during the separation of ferrite from austenite in step-quenched specimens there was no partitioning. Surprisingly,
measurements of manganese concentrations using an electron beam of 1 nm diameter at intervals of 5 nm or less revealed the
presence of narrow spikes in the concentration profile at many ferriteaustenite interfaces in specimens with a ferrite-pearlite
or martensite starting structure as well as in those step-quenched from austenite. In some instances, a minimum in the concentration
profile was found in ferrite, adjacent to a maximum at an interface. Thus, adsorption of manganese at ferriteaustenite interfaces
produces concentrations in excess of the concentrations indicated by the equilibrium diagram. The probable diffusion processes
controlling the kinetics of transformation in the different microstructures are identified. 相似文献
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PURPOSE: To determine whether central venous pressure at the common iliac vein reflects right atrial pressure in adult patients. METHODS: In this prospective, non-blinded study 26 mechanically-ventilated adult patients were studied. Simultaneous pressure readings were obtained from the right atrium (TCVP) and the common iliac vein (ACVP). RESULTS: There was a correlation between TCVP and ACVP (r = 0.987; P < 0.0001). The mean difference between TCVP and ACVP was 0.93 mm Hg. And the limits of agreement were: -1.93 to 1.77 mm Hg. CONCLUSION: Venous pressure recorded from the common iliac vein reflects that in the right atrium. Adopting a femoral route for central venous pressure measurement may avoid some of the complications associated with the subclavian route. 相似文献
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本文针对实际问题,以振动电机作为振动筛的激振源,通过反方向同步控制电路,对双振动电机同步振动筛(简称DEG)做研究。采用电机与筛体联在一起的直接驱动结构,省略了传动装置,结构简单。按线性非共振筛进行设计,矿料在筛分过程中做直线抛掷运动,根据生产要求,对振动筛的工作参数进行了分析和计算。对振动筛的结构进行了改进,采用了梁式结构、锥形筛逢,避免了筛条的二次共振,解决了筛分时的夹矿问题。 相似文献