基于滑模变结构的开关磁阻电机控制仿真

研究开关磁阻电机的非线性及转矩脉动是其较为突出的缺点.从滑模变结构的理论出发,通过将一类通用滑模变结构控制方法应用到开关磁阻电机的控制系统中.在开关磁阻电机精确模型未知情况下,利用滑模变结构控制的快速性和完全自适应性,实现对开关磁阻电机的有效控制.经仿真结果表明,方法能够有效降低开关磁阻电机的转矩脉动,并改善开关磁阻电机的动态性能,同时具有较强的鲁棒性.     

一种开关磁阻电机建模方法的研究与实现

由于开关磁阻电机的非线性特点,难以建立一个精确的开关磁电机的模型,为了精准建立开关磁阻电机模型,利用径向基函数神经网络良好的非线性映射能力在获取准确磁链样本数据基础上训练神经网络,利用训练的径向基神经网络构建开关磁阻电机非线性模型.在此基础上,采用角度位置控制和电压脉宽调制控制相结合的方法搭建开关磁阻电机驱动控制系统的仿真框架.仿真结果表明:利用径向基函数神经网络的方法可以克服开关磁阻电机的非线性问题,所建立的开关磁阻电机模型可以正常稳定运行.从而证明上述方法的合理有效性.     

开关磁阻电机高性能闭环调速系统仿真

在提高开关磁阻电机调速控制的精确度的研究中,由于系统存在非线性,调速精度低.利用传统控制方法进行开关磁阻电机调速的过程中,由于开关磁阻电机是双凸极结构,其电磁特性呈现高度的非线性,参数和结构也是在时刻变化的,不存在有效的反馈,造成固定参数的传统的开环调速控制方法的调速精确度较低.提出一种闭环控制的开关磁阻电机调速方法.利用线性法对开关磁阻电机中的相关控制变量进行分析,建立控制系统模型,以实际电流和参考电流的偏差作为调速过程中的反馈,等效控制开关磁阻电机绕组中的相电压,通过改变反馈参数对绕组中的相电压进行调节,从而实现开关磁阻电机调速过程中的闭环控制.实验结果表明,改进算法能够有效提高开关磁阻电机转速控制的精确性.     

开关磁阻电机控制系统仿真建模研究

基于开关磁阻电机的基本方程式,利用Madab/Simulink环境下的基本模块,搭建了一个开关磁阻电机驱动系统的动态仿真模型.可以对给定参数的开关磁阻电机的动态特性进行仿真.仿真结果证明了开关磁阻电机建模方法的合理性、有效性,为实际电机控制系统的设计和调试提供了新的思路.     

一种开关磁阻电机无位置传感器控制方法的实现

开关磁阻电机位置传感器的使用,增加了结构的复杂性,降低了控制的可靠性,因此脱离传感器的无位置控制技术成为了国内外专家学者研究的热点之一。分析开关磁阻电机的工作原理,并结合国内外有关开关磁阻电机无位置传感器转子位置检测和调速控制的相关文献,总结得到一种简单的开关磁阻电机无位置传感器控制方法。仿真和实验结果表明,该方法能够实现对无位置传感器开关磁阻电机的有效控制。     

基于单片机的开关磁阻电机驱动系统设计

该文介绍了开关磁阻电机的基本原理,设计了一种用80C196单片机实现的开关磁阻电机驱动系统,并对该开关磁阻电机调速系统的性能进行了实验与测试,实验证明该系统运行可靠。     

基于ANSYS的开关磁阻电机静态电磁分析

详细叙述了基于ANSYS有限元软件的APDL语言的三相12／8结构的开关磁阻电机几何建模、网格剖分、载荷施加、边界条件、求解及后处理等步骤,建立了二维开关磁阻电机的有限元模型,分析随电机转子位置变化的开关磁阻电机静态磁场,获得了电感、磁链及转矩等数据,为开关磁阻电机的本体优化及控制系统设计提供了理论依据。     

一种减少开关磁阻电机转矩脉动的算法

在电机转矩性能优化问题的研究中,针对开关磁阻电机在常规PID算法调速运行时,转矩脉动系数大的问题,提出了一种利用TS-ITAE(时间乘绝对误差的积分)的开关磁阻电机自适应控制的新方法,用交流测量法测量开关磁阻电机不同位置以及不同电流下的电感值,得到其局部的线性函数,利用ITAE准则得到开关磁阻电机局部的最优控制器函数,通过模糊TS模型实现全局的非线性控制.将常规PID控制算法和TS-ITAE控制算法分别用于开关磁阻电机的转速-电流调速系统进行仿真.仿真结果表明:采用TS-ITAE控制算法比常规PID控制算法的转矩脉动系数小,动态特性好.     

基于改进BP网络8/6极SRM非线性建模的研究

针对开关磁阻电机(SRM)磁化曲线高度饱和、非线性的特点,提出一种基于改进的BP神经网络建立开关磁阻电机模型的方法。该方法构造了一个将连接权值变为参数可调函数的BP神经网络。通过分析开关磁阻电机磁链与转矩特性获得神经网络的训练样本,经过训练,实现开关磁阻电机非线性建模,并在Matlab/Simulink中建立开关磁阻电机控制系统(SRD)仿真模型。仿真与实验结果的对比,证明了此建模方法可行。与传统BP神经网络建模相比,该方法节约了计算时间,具有很强的泛化能力和较高精度,有效地提高了收敛速度。     

开关磁阻电机发电原理与仿真研究

本文介绍了一种新型六相12/10极开关磁阻电机,对发电运行原理进行了分析,并利用Ansoft公司的RMxprt和Maxwell2D瞬态模块对开关磁阻电机发电系统进行建模,对正常和缺相两种运行状态下的发电性能进行了动态仿真分析,通过与三相6/4极开关磁阻电机发电性能进行比较,验证了新型开关磁阻电机在发电运行时具有更好的安全欲度,说明了相数对安全欲度的影响.     

基于STRUTS框架的SRM系统设计

介绍了构建基于Struts框架的SRM系统，给出了系统的结构和总体设计方案，进行了系统功能的划分，给出了系统总体流程和总体框架设计；分析了J2EE设计模式下的SRM 系统实现以及数据与表现的分离问题、SRM系统Web层的权限管理、SRM系统客户端设计等问题。     

基于DSP的开关磁阻电机能量馈网系统的研究

介绍了一种开关磁阻电机发电运行状态下能量回馈电网的方法,对基于DSP的控制器的控制方法进行了详细阐述,应用PWM逆变技术,将SR电机在发电状态下发出的能量回馈三相电网.     

基于Cortex M3处理器的开关磁阻电机控制器设计

针对常见的开关磁阻电机控制器性能与成本难以兼顾的现状,以32位ARM Cortex M3内核的高性能微处理器STM32F103为核心,设计实现了低压开关磁阻控制器,包括处理模块、功率变换器和检测模块。采用处理器内部模块完成数字和模拟信号的采集、计算和控制信号输出,并通过三相不对称半桥式功率变换器和电流、电压、位置反馈信号实现了对三相12/8极结构开关磁阻电机的控制。测试结果满足设计目标要求。     

A bridgeless Luo converter based speed control of switched reluctance motor using Particle Swarm Optimization (Pso) tuned proportional integral (Pi) controller

Motors are essential parts of each moving equipments that is used for various sorts of moving applications. There are a few kinds of motors accessible for different types of industrial applications, But compared to all types of motors the advantages of Switched Reluctance Motor (SRM) in low and medium power applications has ended up being much effective than the other kinds of motors considering the variables like high flux thickness per unit volume, high effectiveness, low electromagnetic obstruction and low maintenance requirements. This work proposes a bridgeless based Luo converter fed Switched Reluctance Motor drive utilizing Particle Swarm Optimization (PSO) tuned Proportional Integral (PI) controller. The PI tuned converter gives high proficiency, high power thickness, and small structure of the motor driver. The accomplished yield voltages of the proposed converter are connected to SRM motor. The SRM here is chosen for the drive because of its minimal effort and simple development. The proposed Luo converter based SRM drive framework have been approved through simulation utilizing Matlab/ Simulink design. The simulation results validate the Power Factor Correction (PFC) activity with reduced output current THD underneath 9%, according to the given IEEE standard.     

Realization of fault tolerant capability in a multiphase SRM drive using wavelet transform

Switched Reluctance Motor (SRM) are widely used in drives market because of its elegant features such as simple arrangement, manufacturing cost, minimal maintenance and wide speed range. Significant investigation has been conducted to lengthen the feasibility of SRM drive technologies in various aspects such as control strategy, torque ripple minimization, an optimal winding arrangement, etc. Even though it has numerous virtues, there are few noticeable issues that occur in SRM. In this paper, the issues like phase open circuit fault, phase-phase short circuit fault, power switch failure, dc link capacitor failure, and encoder faults are discussed using Wavelet Transform (WT) with their experimental results. A multi-phase (10/8 pole) SRM motor is considered to investigate the fault tolerance proficiency and other performance parameters. Initially, a healthy condition of multi-phase SRM is simulated then faults are injected at different phases which are analyzed and validated using MATLAB simulink tool and the same is validated through experimental results. The performance parameters of SRM drive during various faults conditions are analyzed and the impacts of speed and torque are illustrated.     

Highly accurate real-time image steganalysis based on GPU

With the development of steganography, it is required to build high-dimensional feature spaces to detect those sophisticated steganographic schemes. However, the huge time cost prevents the practical deployment of high-dimensional features for steganalysis. SRM and DCTR are important steganalysis feature sets in spatial domain and JPEG domain, respectively. It is necessary to accelerate the extraction of DCTR and SRM to make them more usable in practice, especially for some real-time applications. In this paper, both DCTR and SRM are implemented on the GPU device to exploit the parallel power of the GPU and some optimization methods are presented. For implementation of DCTR, we first utilize the separability and symmetry of two-dimensional discrete cosine transform in decompression and convolution. Then, in order to make phase-aware histograms favorable for parallel GPU processing, we convert them into ordinary 256-dimensional histograms. For SRM, in computing residuals, we specify the computation sequence and spilt the inseparable two-dimensional kernel into several row vectors. When computing the four-dimensional co-occurrences, we convert them into one-dimensional histograms which are more suitable for parallel computing. The experimental results show that the proposed methods can greatly accelerate the extraction of DCTR and SRM, especially for images of large size. Our methods can be applied to the real-time steganalysis system.     

Duality of 2-D singular systems of Roesser models

In this paper, the properties and concepts of dual systems of the two-dimensional singular Roesser models (2-D SRM) are studied. Two different concepts of the dual systems are proposed for the 2-D SRM. One is derived from the duality defined for two-dimensional singular general models (2-D SGM)-called the S-dual systems; the other one is defined based on 2-D SRM in a traditional sense-called the T-dual systems. It is shown that if a 2-D SRM is jump-mode free or jump-mode reachable, then it can be equivalently transformed into a canonical form of a 2-D SRM, for which the T-duality and the S-duality are equivalent. This will be of some perspective applications in the robust control of 2-D SRM.     

Duality of 2-D singular systems of Roesser models

In this paper, the properties and concepts of dual systems of the two-dimensional singular Roesser models （2-D SRM） are studied. Two different concepts of the dual systems are proposed for the 2-D SRM. One is derived from the duality defined for two-dimensional singular general models （2-D SGM）-called the S-dual systems; the other one is defined based on 2-D SRM in a traditional sense-called the T-dual systems. It is shown that if a 2-D SRM is jump-mode free or jump-mode reachable, then it can be equivalently transformed into a canonical form of a 2-D SRM, for which the T-duality and the S-duality are equivalent. This will be of some perspective applications in the robust control of 2-D SRM.     

一种固体火箭发动机性能仿真与评估方法研究

关于固体火箭发动机性能的准确评估问题,针对固体火箭发动机试验耗费时间周期长,且评估性能决定动力系统的可靠性。发动机在工作过程中的推力、燃烧室压强、总冲量、比冲量等性能参数的可靠性均存在一个置信区间,通过试验方法难以评估在制造及使用过程中的随机因素影响下的性能可靠性。可用蒙特卡洛仿真方法解决上述问题。为了更全面评估性能参数的可靠度,引入了抽样验收方法,得到了性能参数可靠度的置信区间。采用修正内弹道计算模型,对大扩张比发动机进行仿真,结果与试验数据进行了对比。实验表明,仿真模型的精确性可以满足要求,结果与试验数据具有较高的一致性。证明评估方法可以全面的反应性能参数的统计特性,可为发动机的可靠性提供保证。     

开关磁阻电机直接转矩控制的仿真研究

在分析开关磁阻电机(SRM)直接转矩控制(DTC)理论的基础上,给出了DTC在SRM中应用的具体实现方法,然后在MATLAB环境中搭建了SRM直接转矩控制的系统仿真模型。仿真结果表明,直接转矩控制可有效抑制SRM的转矩脉动。