共查询到20条相似文献,搜索用时 0 毫秒
1.
2.
开关磁阻电机的转矩脉动是应用中的一个突出问题。该文对1台6/4极结构的开关磁阻电机在已获得矩角特性的基础上.应用自适应模糊神经网络(ANFIS)对其转矩逆模型进行离线学习。学习完成之后.根据转矩分配函数对各相转矩进行分配,利用模糊神经网络实时优化出期望转矩所需要的相电流波形,然后采用电流滞环跟踪此期望电流,从而实现电机的低转矩脉动控制。仿真结果证明了这种方法的有效性。 相似文献
3.
4.
Oğuz Üstün 《电力部件与系统》2020,48(6-7):667-681
Abstract—This article presents a novel torque ripple minimization approach based on the genetic algorithm (GA) for the switched reluctance motor (SRM) drives. The fitness function of the GA is designed on the basis of two main optimization criteria. The first optimization criteria; three objectives are defined to optimize commutation angles minimizing torque ripple and copper loss. The second optimization criteria; an objective is defined to eliminate the negative torque which decreases the average torque in SRM drives. The achievement of all objectives depends on the adjusting appropriate the commutation angles of the torque sharing functions (TSF) during the commutation period. All of conventional TSFs are dependent on three different commutation angles, namely turn-on, turn-off, and overlapping. Due to the nonlinear phase inductances of SRM, the delay of current rising and falling time are not unity in overlapping commutation region. To overcome the separation of the incoming and outgoing phase currents during the commutation region, rise angle, and fall angle are used instead of overlapping angle. GA is used to optimize the commutation angles of conventional (sinusoidal) TSF and improved (sinusoidal) TSF. At the same time, the elimination negative torque effects on torque ripple, average torque, and copper loss is investigated. 相似文献
5.
本文提出了一个用于抑制转矩脉动的开关磁阻电动机直接转矩模糊逻辑控制系统模型 ,在系统的设计中同时采用了三种方法使转矩脉动最小化 :(1 )直接转矩线性控制 ,用以获得迅速的直接转矩响应 ;(2 )相电流调制优化算法 ,用以获得最佳的相电流波形 ,保证各相绕组瞬时转矩之和为一恒定值 ;(3 )模糊逻辑控制器 ,对各相电流进行进一步调制 ,用以获得转矩的动态稳定。同时文中还介绍了该智能控制器的设计方法 ,并通过数字仿真证实了该设计不仅有效地抑制了转矩的脉动 ,而且具有期望的瞬态响应特性 相似文献
6.
7.
针对无位置传感器开关磁阻电机全速范围内的转矩脉动较大问题,设计了一种间接转矩控制方法分别对高低速不同区间内的转矩脉动进行抑制.首先对于无位置传感器控制方法,建立了低速角度估算法和高速简化磁链法的不同控制模型,对于不同转速范围区间的优劣势构建全速范围内无位置传感器的控制.通过模型分析和公式推导得出影响转矩的因素,即限制电流幅值和调节开通角度等两种间接转矩的控制方法,在低速和高速不同的转速范围应用相应的电流斩波控制方法和角度位置控制方法来对转矩的波动进行抑制.仿真试验结果表明,该方法能够有效抑制无位置传感器开关磁阻电机不同转速区间的转矩脉动. 相似文献
8.
9.
10.
11.
基于转矩矢量控制的开关磁阻电机转矩脉动控制 总被引:10,自引:1,他引:10
转矩脉动是开关磁阻电动机较为突出的缺点。文章基于电机的线性模型,提出了开关磁阻电动机转矩矢是控制策略,通过控制开关磁阻电动机各相绕组电流-位置曲线,在空间合成多个转矩矢量,以减小转矩脉动,仿真结果表明,这种控制策略不但控制简单,而且能够在低速下有效地抑制开关磁阻电动机转矩脉动。 相似文献
12.
开关磁阻电机小波神经网络无位置传感器控制 总被引:3,自引:0,他引:3
提出了一种基于小波神经网络的开关磁阻电机无位置传感器控制新方法.该方法采用两个不同的小波神经网络分别获取相绕组换相逻辑的开通信号和关断信号,经过综合处理得到单相绕组的开关信号.神经网络以相绕组的电流和磁链为输入,以各相的开关信号为输出,从而建立起电流、磁链和开关信号的非线性映射.采用电机在有位置传感器运行条件下的样本对小波神经网络进行训练,训练完成后,用神经网络输出结果取代位置传感器换相信号,实现电机无位置传感器运行.仿真和实验结果表明,由神经网络获得的开关信号和由位置传感器获得的开关信号相比误差小,电机能够准确换相,且输出转矩波动小,转速曲线平滑,电机在无位置传感器下运行良好. 相似文献
13.
14.
15.
16.
减小开关磁阻电机转矩脉动的控制策略综述 总被引:3,自引:1,他引:2
转矩脉动抑制的研究是近年来开关磁阻电机研究领域的热点之一,电机结构参数的优化设计及合适控制策略的应用是抑制转矩脉动的主要方案.从控制的角度,对减小转矩脉动的各种控制策略的研究状况进行了总结,详细分析了典型控制策略的控制机理,对其优缺点进行了分析比较,并展望了减小开关磁阻电机转矩脉动控制策略的发展趋势. 相似文献
17.
Mohammad Reza Tavakoli Hossein Torkaman Farzad Faradjizadeh Ebrahim Afjei 《电力部件与系统》2015,43(5):533-542
Abstract—In this article, a comprehensive method is introduced to redress eccentricity fault consequences. Two main effects of eccentricity faults include considerable increase in unbalanced magnetic force and torque ripple. Dependency of unbalanced magnetic force and torque ripple on eccentricity fault level is shown, and the possibility of compensating them via controlling currents in facing poles is proved. These objectives are accomplished through a novel converter that controls currents in poles of every phase such that one pole is responsible for nullifying unbalanced magnetic force and the facing pole is in charge of torque ripple reducing. The control algorithm is analyzed in details and through finite-element method and MATLAB/Simulink (The MathWorks, Natick, Massachusetts, USA) is implemented on a 6/4 switched reluctance motor with 30% eccentricity fault level. The proposed strategy samples the flux leakage as the index both for occurrence and criterion for compensation of unbalanced magnetic force. The suggested method is designed such that there is no need to detect eccentricity fault direction, location, and type, which makes it cost effective and practical for a wide range of switched reluctance motors and applications. 相似文献
18.
Torque ripple is a major problem for switched reluctance motors, which may cause undesirable vibration and acoustic noise, especially at low speed. This paper presents an optimal topology structure of rotor for 8/6 pole switched reluctance motor by using the level set method. The nonlinear ferromagnetic material boundary of rotor pole is implicitly represented through an embedded level set function. This method is applied to obtaining the optimal distributions of material in the design domain for minimizing torque ripple and maximizing average torque. In the optimization objective function, the reluctivity of ferromagnetic material is selected as the design variable. The normal velocity is derived from sensitivity analysis, where the adjoint variable method is utilized. Two-dimensional finite element method is employed to calculate the electromagnetic parameters of this electric machine. Analysis results obtained from the transient simulation of electromagnetic field coupled with control circuit show that the torque ripple is reduced effectively by using the optimized rotor structure. 相似文献
19.
20.
开关磁阻电机(Switched Reluctance Motor,SRM)的双凸极结构导致其运行时产生很强的转矩脉动,采用传统型转矩分配函数(Torque Sharing Function,TSF)时,电流峰值过高,铜耗过大,导致电机效率低,转矩脉动抑制效果不理想。针对这一问题,本文提出了新型分段式TSF,并以转矩脉动系数和电流变化率作为优化目标,利用遗传算法的全局寻优能力,对所提出的新型TSF中的变量参数进行优化,得到最优的TSF曲线及表达式,从而降低转矩脉动。仿真结果表明,本文所提出的新型TSF能够有效降低转矩脉动,同时降低电流峰值,减小铜耗,提高效率。 相似文献