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阐述无轴承异步电动机径向悬浮力产生原理及其数学模型。用有限元方法分析了无轴承异步电动机气隙磁场分布状况及径向悬浮力与绕组中电流之间的非线性关系,为无轴承异步电动机获得最大径向悬浮力的优化设计及对应的控制策略提供了依据。 相似文献
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异步电动机轴承常见故障分析及处理 总被引:2,自引:0,他引:2
轴承是异步电动机的关键器件,也是易损器件。轴承能否正常运行,关系到电动机的平稳运行。轴承自身及各种外部因素常常影响轴承的正常运行,使轴承故障的诊断变得错综复杂。结合维修实践,分析了异步电动机轴承常见故障及处理方法,采用简单实用的听触法监测轴承的运转状态,并对预防轴承损坏提出了相应的措施。 相似文献
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轴承是异步电动机的关键器件,也是易损器件。轴承能否正常运行,关系到电动机的平稳运行。轴承自身及各种外部因素常常影响轴承的正常运行,使轴承故障的诊断变得错综复杂。结合维修实践,分析了异步电动机轴承常见故障及处理方法,采用简单实用的听触法监测轴承的运转状态,并对预防轴承损坏提出了相应的措施。 相似文献
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基于神经网络逆系统理论无轴承异步电动机解耦控制 总被引:4,自引:0,他引:4
无轴承异步电动机是一个多变量、非线性、强耦合的系统,其径向力和转速之间存在交叉耦合,若要实现电动机转子稳定悬浮和运行,必须对电动机转速和径向力进行动态解耦控制。为此,本文提出了一种基于神经网络逆系统的无轴承异步电动机解耦控制方法。理论分析表明,此方法可以将无轴承异步电动机动态解耦成位移子系统、转速子系统和磁链子系统,从而简化外环控制器的设计,进一步提高整个系统的控制性能。最后,对采用所提解耦方法的整个无轴承异步电动机控制系统进行了仿真和初步的实验研究,结果验证了该解耦方法的有效性。 相似文献
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基于电机定子电流信号分析方法的异步电动机轴承故障检测中,计及实际电动机供电电压谐波和三相电压不平衡等外部因素的情况下,如何实现轴承故障的可靠检测一直是电动机故障检测领域的难题.对传统的定子电流频谱分析方法进行了深入研究,讨论了传统最小均方算法(LMS)自适应滤渡方法在信号处理中的不足.在此基础上,提出了将小渡分析、连续细化傅里叶变换和改进LMS自适应滤波方法有机结合的异步电动机轴承故障检测新方法.该方法能够正确判断轴承故障特征频率分量,从而提高异步电动机轴承故障诊断效果,实现轴承故障的可靠检测.实验结果表明了该方法的有效性. 相似文献
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基于EMTDC的异步电动机故障仿真 总被引:1,自引:1,他引:1
推导了电力系统电磁暂态仿真软件EMTDC中的三相异步电动机模型,介绍了电动机暂态过程的求解算法。基于EMTDC对单相接地,断机和机械堵转等电动机常见故障进行了仿真计算,获得了各种故障情况下的特征波形,并进行了定量误差分析,验证了EMTDC电动机模型和算法的有效性和正确性,为电动机故障诊断和保护的深入研究提供了一种有效的仿真工具。 相似文献
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Onofre A. Morfín Riemann Ruiz-Cruz Fredy A. Valenzuela Miguel A. Murillo Abel E. Quezada 《电力部件与系统》2018,46(3):302-315
One of the most important bases for designing robust closed-loop controllers applied to induction motor with high performance is establishing its mathematical model and state observers, as well as the parameter identification with high accuracy. In this paper, a step-by-step mathematical model of the squirrel-cage induction motor is described at αβ coordinate frame where the parameters are defined in detailed form; the rotor flux linkages and load torque are estimated via an asymptotic observer; the induction motor parameter identification is performed via a data acquisition board, applying dynamic and steady-state tests. Inductances of the induction motor model are calculated using the proposed relationships between the magnetically coupled circuit and equivalent circuit model. The mathematical model, state observers, and parameter identification procedure of squirrel-cage induction motor are validated via comparison of simulation signals with their corresponding real-time signals. This validation is made experimentally by a steady-state test, where load conditions are changed via a dynamometer which is belt coupled with the squirrel-cage induction motor. 相似文献
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该文针对感应电机损耗进行实验测试和2D有限元建模。首先搭建了感应电机损耗测试的实验平台,在三相正弦波驱动电机的情况下,测得电机空载时的风阻与摩擦损耗、铜损耗以及铁损耗。根据实验测试结果,建立了较精确的感应电机损耗2D有限元模型。在三相正弦波电源驱动负载电机和PWM波电源驱动空载/负载电机时,利用该有限元仿真模型和实验平台分别计算和测试了电机各种损耗。实验结果有效地证实了仿真模型的正确性。 相似文献
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Wind turbines with higher power ratings are desired to reduce construction cost and maintenance time and increase energy yields. Three-phase induction generators are widely used in renewable power generation. Self-excited, squirrel cage induction generators are ideally suited for remote, standalone applications of low and medium power generation. The emerging multiphase induction generator (MPIG) with phases more than three is receiving significant attention for high power applications. This paper aspires at the performance investigation of five-phase induction generator (FPIG) in self-excited mode for standalone wind applications. The dynamic model of FPIG is developed using Matlab/Simulink. The performance of wind-driven FPIG under different operating conditions has been analyzed. The process of voltage build-up, current and torque under no load and loaded conditions are presented. The results are compared with three-phase self-excited induction generator (SEIG) to show the effectiveness of FPIG for high-power wind generation. 相似文献