共查询到19条相似文献,搜索用时 109 毫秒
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主要研究适用于高开关频率变频器驱动的感应电动机数学模型。通过对一般化感应电机数学模型的分析.提出一种改进的电机模型,该模型使转子电流is与转差率S呈线性变化.实现了电磁转矩和转速之间的线性关系。 相似文献
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感应电机的神经网络逆系统线性化解耦控制 总被引:26,自引:10,他引:26
提出了一种新的感应电机的线性化解耦控制方法,其特点是不依赖于对象的精确数学模型与参数。通过用静态神经网络加积分器来构造感应电机的逆系统,将感应电机这一多变量、非线性、强耦合的复杂对象动态解耦成转速与转子磁链两个二阶线性子系统,然后运用线性系统理论进行综合。仿真与初步的实验结果表明系统具有优良的静态及动态解耦性能,且对电机参数的变化与负载扰动具有较强的鲁棒性。 相似文献
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为了提高感应电机效率,研究一种高效永磁感应电机。在分析永磁感应电机结构和工作原理的基础上,采用同步旋转坐标系建立永磁感应电机的数学模型。对永磁感应电机的稳态功率特性进行深入分析,研究定子磁链在不同扇区时,电压矢量对电机有功功率与无功功率的影响,从而得到了适用于永磁感应电机直接功率控制的矢量开关表,提出适用于该电机的直接功率控制策略。最后通过仿真验证了所提控制方法的有效性与正确性。永磁感应电机直接功率控制以零无功功率为控制目标,在不影响有功功率输出的前提下,把无功功率限制在零附近波动,从而提高了电机运行的效率和功率因数。 相似文献
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笼型感应电动机转子断条和开裂的故障诊断和在线监测 总被引:3,自引:0,他引:3
分析了笼型感应电动机转子故障时导条断条和端环断裂的物理模型 ,给出了电动机的定转子绕组的参数计算表达式 ,建立了数学模型 ,从而导出转子故障时的电流和频谱分析。本文分析了电动机在故障时 ,在dqn任意速坐标系中 ,电动机定子电流的轨迹 ,为电动机的故障诊断和在线监测提出了一种新的方法 ,较以往的电流监测方法更有利于克服边频带的影响。 相似文献
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This paper presents a mathematical model of a three-phase induction motor taking into consideration the interbar contacts. Several models have been available in the references. However, they consider the rotor of the induction motor as being constituted either a three-phase or a squirrel cage even if it operates under stator and/or rotor faults condition. Nonetheless, the contact between a bar and the iron core for the machine has to be considered, especially when a rotor fault occurs. It is obvious that rotor currents are under the influence of rotor constitution materials. So, the paper aim’s concerns a transient model of the induction motors which can consider the rotor broken bars defect. Despite its increasing complexity, it could be able to provide with useful indications for diagnostic purposes. This model is advocated for the simulation of motors behavior under rotor defect which takes into account the interbar currents. The proposed technique is based on the mesh model analysis of the squirrel cage. As low power induction motors are prevalent in industrial plants, we pay a special attention on them. Notwithstanding, additional currents are due to the contact between the non-insulated bar constituting the squirrel cage to the rotor iron core. The monitoring of induction motors is predominantly made through the stator current analysis of the motor when it operates at nominal condition. Moreover, this one is observed in steady state operating system, knowing that the motor is generally fed by a sinusoidal supply. Consequently, simulation results showed in this paper prove the effectiveness of the proposed approach, and the impact of interbar resistance both on the model and the line current spectrum for the diagnostic. An experimental test proves the effectiveness of this model. 相似文献
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实心笼型异步电机转子涡流分析与计算 总被引:1,自引:0,他引:1
使用ANSYS软件建立实心笼型异步电机二维有限元模型,分析考虑磁路饱和情况下电机起动时转子中涡流的分布情况,计算转子笼条和实心体中的涡流损耗。通过场分析方法对该种电机进行研究,为电机参数的计算、结构的改进及控制系统的设计提供可靠依据。 相似文献
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Three-phase short-circuits of the induction machine yields to high levels of stress in an induction traction drive. To study these operations, the authors propose to model the machine by a multiple cage equivalent circuit. This enables us to take into account the deep bar effect with accuracy. The identification of the equivalent circuit and its validation are carried out experimentally for a 30-kW double-cage induction motor. 相似文献
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基于绕组函数的鼠笼式异步电动机故障仿真 总被引:3,自引:2,他引:1
仿真是故障研究的一种重要途径,仿真效果与模型系数的计算准确度密切相关。异步电动机仿真模型中有大量的电感参数.利用绕组函数计算这些电感参数适用范围广、精度高。在此基础上.建立了鼠笼式异步电动机正常时和定子匝间短路、转子断条、气隙偏心等常见故障情况下的数学模型.并进行仿真分析。仿真结果与理论分析得到的结论基本吻合,表明模型及参数计算正确,可为故障诊断提供依据。 相似文献
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This paper presents a performance analysis of a vector-controlled cage induction motor drive. The drive is fed from a current-controlled converter-inverter system. The pulsewidth modulation current control technique is used to derive the switching signals for the converter, as well as the inverter. Closed-loop control of the cage induction motor utilizes a fuzzy proportional integral derivative speed controller. The advantages offered by the current control converter-inverter link are exploited. In order to examine the dynamic performance of the drive system, its model is simulated and results are analyzed. The potential applications of this particular drive system are outlined 相似文献
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考虑笼型转子实际结构的感应电动机建模研究 总被引:1,自引:0,他引:1
根据交流电机多回路理论,通过把传统的Park变换方法推广到面向转子侧的多相系统,提出了考虑笼型转子实际结构的感应电动机模型,并基于EMTP环境实现了该模型.本文提出的模型能够对电动机的正常运行、外部故障以及笼型转子导条或端环断裂故障进行精确的仿真.既可以用来探求笼型转子故障后各个电气量和机械量的变化规律,作为电动机故障诊断和保护研究的工具;也可以用来进行用电机实验方法无法完成的笼型转子导条或端环断裂后导条或端环电流变化情况的研究,为电机设计制造部门提供参考.仿真与实验结果证明了模型的精确性和有效性,经进一步完善该模型可作为EMTP的一个功能模块使用,具有良好的应用前景. 相似文献