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异步电动机定子串不对称电抗起动的瞬态分析
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作者 邓建国 罗隆福 《微电机》 2004年第2期21-23,共3页
对三相笼型异步电动机定子串不对称电抗的起动过程进行瞬态分析。为了得到起动特性,根据三相异步电动机在相坐标系下的瞬态数学模型,编写计算机仿真程序,通过实例对三相笼型异步电动机的定子电路一相串联电抗时的起动过程进行仿真计算;... 对三相笼型异步电动机定子串不对称电抗的起动过程进行瞬态分析。为了得到起动特性,根据三相异步电动机在相坐标系下的瞬态数学模型,编写计算机仿真程序,通过实例对三相笼型异步电动机的定子电路一相串联电抗时的起动过程进行仿真计算;用对称分量法分析定子电路一相串联电抗时的不对称系统,确定起动电抗的数值。对仿真结果进行比较分析。 展开更多
关键词 异步动机 定子 定子电路 抗起动 计算机仿真程序
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常用起动电路的改进
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作者 龚仲华 《制造技术与机床》 CSCD 北大核心 2003年第4期30-31,共2页
对国内、外常用的三相异步电动机起动电路性能进行了分析、比较 。
关键词 Y-△起动线 定子阻起动 自耦变压器减压起动 改进 三相异步动机
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常用起动电路的改进
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作者 龚仲华 《机床电器》 2003年第3期48-50,共3页
本文对国内、外常用的三相异步电动机起动线路性能进行了分析、比较 ,提出了典型线路改进意见。
关键词 三相异步动机 起动线 Y-△起动线 定子阻起动 自耦变压器减压起动 改进
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高压同步电动机常见故障分析
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作者 郭益年 《科技创新与应用》 2012年第23期71-71,共1页
高压同步电机以其一系列的优点,被广泛应用于我国各行各业之中,但高压同步电机在使用中经常会出现一些故障,影响生产和设备的安全运行,正确分析高压同步电机故障原因,对提升高压同步电机的安全运行能力有重要意义。
关键词 同步 转子回 定子电路 负载故障
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国产50Hz、380V电动机在国外60Hz、440V电网上的应用
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作者 施群 《油田建设设计》 1998年第1期21-23,共3页
以交流电动机定子电路的电势方程为理论依据,利用电机简化电路定性分析了50Hz、380V三相异步电机在60Hz、440V供电系统中应用的可行性,并在秘鲁塔拉拉油田的工程实践中得到了成功应用。
关键词 三相异步动机 定子电路 变频调速 磁通 转矩 系统
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A new probe for atmospheric electric field mill 被引量:2
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作者 孙健 王建岭 《Journal of Measurement Science and Instrumentation》 CAS 2014年第1期15-20,共6页
A new probe for atmospheric electric field mill is introduced.It consists of three parts:signal acquisition circuit for atmospheric electric field,preamplifier circuit and phase sensitive detection circuit.The signal... A new probe for atmospheric electric field mill is introduced.It consists of three parts:signal acquisition circuit for atmospheric electric field,preamplifier circuit and phase sensitive detection circuit.The signal acquisition circuit adopts the double-stator structure to form differential input circuit,thus double-precision is obtained.Preamplifier circuit is made of current-to-voltage (I-V) conversion circuit,differential amplifier circtuit and secondary amplifying circuit.The polarity of electric field is obtained via phase sensitive detection circuit.Simulation results are obtained using Multisim,and the feasibility of the designed probe is verified. 展开更多
关键词 atmospheric electric field mill PROBE DOUBLE-STATOR differential amplifier circuit preamplifier circuit
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A High-Quality Preconditioning Technique for Multi-Length-Scale Symmetric Positive Definite Linear Systems 被引量:1
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作者 Ichitaro Yamazaki Zhaojun Bai +1 位作者 Wenbin Chen Richard Scalettar 《Numerical Mathematics(Theory,Methods and Applications)》 SCIE 2009年第4期469-484,共16页
We study preconditioning techniques used in conjunction with the conjugate gradient method for solving multi-length-scale symmetric positive definite linear systems originating from the quantum Monte Carlo simulation ... We study preconditioning techniques used in conjunction with the conjugate gradient method for solving multi-length-scale symmetric positive definite linear systems originating from the quantum Monte Carlo simulation of electron interaction of correlated materials. Existing preconditioning techniques are not designed to be adaptive to varying numerical properties of the multi-length-scale systems. In this paper, we propose a hybrid incomplete Cholesky (HIC) preconditioner and demonstrate its adaptivity to the multi-length-scale systems. In addition, we propose an extension of the compressed sparse column with row access (CSCR) sparse matrix storage format to efficiently accommodate the data access pattem to compute the HIC preconditioner. We show that for moderately correlated materials, the HIC preconditioner achieves the optimal linear scaling of the simulation. The development of a linear-scaling preconditioner for strongly correlated materials remains an open topic. 展开更多
关键词 PRECONDITIONING multi-length-scale incomplete Cholesky factorization quantum MonteCarlo simulation.
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Design Methods for Improving the Performance and Thermal Stability of Radar
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作者 Sega Gueye Brayima Dakyo +2 位作者 Sylvain Alves Jacques Raharijaona Philippe Eudeline 《Journal of Energy and Power Engineering》 2013年第1期148-154,共7页
The radar power supplies exhibit a complex electronics. The development of more and more compact systems leads to master the interaction between different parts of the power supply while reducing electronic circuits, ... The radar power supplies exhibit a complex electronics. The development of more and more compact systems leads to master the interaction between different parts of the power supply while reducing electronic circuits, magnetic and thermal couplings from the constitutive circuitry. The consideration of these phenomena is very difficult at the design of the power supply. This paper presents two complementary methods based first on a circuitry model for the quantification of heat sources and secondly on finite element model for heat diffusion. This approach can help a designer in the goal of improving the performances and thermal stability of radar tied to the supply circuit subset. 展开更多
关键词 Thermal management power MOSFET losses radar supply.
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交流电动机的运行和维护(二)
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作者 何立敏 《家电检修技术(资料版)》 2012年第11期52-54,共3页
②调节电阻RQ的大小可以将起动电流限制在允许的范围内。采用定子电路串电阻降压起动时,虽然降低了起动电流,但也使起动转矩大大减小。故此法只适用于空载或轻载起动。由于采用电阻降压起动时损耗较大,它一般用于低压电动机起动中。
关键词 交流动机 降压起动 维护 运行 动机起动 流限制 定子电路
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