基于电压斩波及关断角补偿控制的SRD仿真实现

为了简化控制和降低成本,对开关磁阻电动机(SRM)采用电压斩波控制方式;针对SRM转矩脉动大的问题,采用模糊控制器对SRM的关断角进行实时补偿,达到减小转矩脉动的目的.分析SRM非线性数学模型,在MATLAB/Simulink中建立基于电压斩波及关断角补偿控制的开关磁阻电动机调速系统(SRD)仿真模型.最后通过仿真,验证了电压斩波控制方式的正确性,也验证了文中减小SRM转矩脉动方法的可行性和有效性,为实际的SRD设计和调试提供有效的手段和工具.     

矿用开关磁阻电机车控制系统设计

为了改善蓄电池电机车在煤矿井下的工作性能,同时降低能耗、提高工作效率,设计了一种基于ARM的开关磁阻电机车控制系统。该系统采用角度位置控制与电压斩波控制相结合的控制方式,应用转矩分配函数控制策略,结合速度、电流双闭环系统实现对蓄电池电机车的控制。实验结果表明,该系统转矩脉动小,效率高,具有较强的鲁棒性和良好的调速性能。     

高频斩波串级调速系统建模与动、静态特性分析

与传统控制方式不同,斩波串级调速在回路拓扑结构和主回路工作方式上变化较大,因此需要详细分析其调速机理和系统动、静态特性,从而为其工程设计提供理论依据。首先介绍了高频斩波串级调速系统的工作原理,利用状态空间平均法分析了主回路各参量基本输入输出关系,得到了平均状态下的主回路简化数学模型,结合串级调速下负载电流与转矩关系以及异步电动机机电运动方程,得出了高频斩波串级调速系统的简化动态模型,并在此基础给出了系统调速的开环动态结构图,分析了斩波串级调速系统的动、静态特性,为进一步分析系统闭环控制及工程设计提供了理论基础。     

斩波串级调速控制系统在穿孔机中的应用

针对穿孔杨生生工艺特点及对电气传动系统的要求,设计了双闭环斩波串级调速控制系统.介绍斩波式串级调速系统的工作原理,说说其具有较硬的机械特性,适用于穿孔机的周期性短时工作负载.并设计电流内环和转速下环的双闭环自动控制系统,进一步提高穿孔工艺过程中电机转速的静态、动态品质,具有工程应用和推广价值.     

一种电动机串联斩波调速方法研究

针对并联斩波调速、转子串电阻调速以及改变转子附加电动势所存在的的缺点,提出了一种新的电动机串联斩波调速方法,该方法通过改变电动机的转子电流实现电机调速。通过SCR斩波调速和IGBT斩波调速的比较,证明IGBT斩波调速控制方式先进、可靠性高、效率高、成本低,易实现产业化,具有显著的节能效果。     

绕线式异步电机电流斩波调速系统的设计

本文以绝缘栅极型功率管作斩波管,采用电流斩波的方式,设计了一个绕线式异步电机的电流转速双闭环控制系统。文章阐述了该方案的调速原理,介绍了调速系统的双闭环结构,着重研究了该系统的硬件设计。仿真实验证明,该系统的静态精度和动态性能均得到明显改善。     

调压方式下开关磁阻电机的变结构控制

针对开关磁阻电机转矩脉动的缺点,在调压方式下利用变结构控制,同时配合以电流斩波和适当的开关角度来控制开关磁阻电机,提高了系统的鲁棒性。仿真实验结果表明,该控制方式效果良好,实际可行;用于固态物料的料位探测,克服了因转矩脉动造成的低速不稳定现象。     

基于MATLAB的直流电动机斩波调速系统仿真研究

利用MATLAB中的电气系统模块库 (PSB)和Simulink ,为直流电动机双闭环斩波调速系统建立了仿真模型 ,并给出了仿真结果     

基于Simulink仿真的电动机变结构调速

为了改善直流电动机降压调速的动态特性,减小电枢电流脉动,文中提出一种直流电动机降压调速新方法,用双滑模面变结构控制DC-DC变换器进行直流电动机降压调速,利用双滑模面分别实现直流电动机内外环控制,内环滑模面用于电流控制环,外环滑模面用于转速控制环.通过Matlab中的Simulink工具仿真和比较表明直流电动机采用这种变结构控制降压调速,可得到平滑无级调速;其响应的上升时间、调整时间均很小;对外界扰动和参数摄动有很强的鲁棒性;电枢电流和电磁转矩冲击可控制在允许值内,具有理想的调速性能.该方法具有一定的实用价值.     

异步电动机转子电阻斩波调速系统的特性分析与仿真研究

转子电阻斩波调速是异步电动机一种简便而有效的调速方法。本文对异步电动机转子电阻斩波调速系统的静态和动态特性进行了详细的分析，进一步确定了转子外接电阻的计算方法和系统的动态数学模型，并对该系统应用MATLAB／SIMuLINK进行了仿真研究。仿真结果表明，本文的分析是简单而有效的。     

Optimal closed-loop control of a hybrid step motor with chopper drive

Optimal closed-loop control of a hybrid step motor control with chopper drive is described. Expressions for the average torque and optimal control angle giving maximal average torque in the stationary state without phase current chopper control are presented. The effects of chopper current control on the torque and acceleration characteristics of a hybrid step motor are discussed. Expression have been developed for the control angle in the chopper current control mode, yielding greater torques and improved acceleration of hybrid step motors than for the optimal control angle without phase current control. The speed response of a hybrid step motor operated in a closed-loop system has been studied by computer simulation for different supply voltages and torque loads, using various control angle algorithms.     

Adaptive steering‐based HDTC algorithm for PMSM

This paper introduces sensorless hysteresis direct torque control for permanent magnet synchronous motors to provide a reduced torque pulsation profile, which leads to a smaller mechanical vibration. The suggested algorithm utilizes the principle of vehicle steering, which continuously fixes the direction of the vehicle in the track. Moreover, the algorithm efficiently employs the output of torque and the output of flux error controllers used in basic hysteresis direct torque control to select two nonzero adjacent vectors. The initial switching time for the selected vectors is determined by a function that considers the absolute magnitude of the torque error and the magnitude of the flux error in addition to the space angle position of the stator flux. To reduce the processing time in the control signal flow, a suggested structure for switching the initial time of the selected vectors is developed. The final switching time of the vectors is adaptively adjusted according to the minimum required stator voltage to drive the load and according to the stored rotor energy that arises due to the inertia of the mechanical load connected to the motor shaft. The simulation results along with the experimental results show a fast dynamic response of torque, relatively reduced torque ripples, and reduced current harmonics compared to the basic hysteresis direct torque control.     

Torque characteristics in a large permanent magnet synchronous generator with stator radial ventilating air ducts

In this study, we investigated the torque characteristics of large low-speed direct-drive permanent magnet synchronous generators with stator radial ventilating air ducts for offshore wind power applications. Magnet shape optimization was used first to improve the torque characteristics using two-dimensional finite element analysis (FEA) in a permanent magnet synchronous generator with a common stator. The rotor step skewing technique was then employed to suppress the impacts of mechanical tolerances and defects, which further improved the torque quality of the machine. Comprehensive three-dimensional FEA was used to evaluate accurately the overall effects of stator radial ventilating air ducts and rotor step skewing on torque features. The influences of the radial ventilating ducts in the stator on torque characteristics, such as torque pulsation and average torque in the machine with and without rotor step skewing techniques, were comprehensively investigated using three-dimensional FEA. The results showed that stator radial ventilating air ducts could not only reduce the average torque but also increase the torque ripple in the machine. Furthermore, the torque ripple of the machine under certain load conditions may even be increased by rotor step skewing despite a reduction in cogging torque.     

开关磁阻电动机调速系统的应用研究

文章介绍了适用于工业运输设备的开关磁阻电动机调速系统,由于其具有起动电流小,起动转矩大,运行效率高的特点,因此能够解决工业运输设备中重载不能起动和能耗较大的实际问题,并提出了设计方案,说明了运行过程,指出了该系统的优点。     

A new fuzzy logic estimator for reduction of commutation current pulsation in brushless DC motor drives with three-phase excitation

Under the operation of brushless DC motor with three-phase excitation, commutation current pulsation is produced at each commutation at high-speed region. As it can be eliminated when the current slew rates are made equal, a simple and effective fuzzy logic estimator (FLE) is presented first time in the literature to reduce such current pulsation. Its function is to simply regulate the commutation angle accurately to maintain the same current slew rates of commutated phases during commutation, thereby keeping the other phase current unchanged. Unlike previous studies, the presented method does not require torque observer or detection circuits for sensing commutation interval, in addition to commutation time calculation. A genetic algorithm is employed for optimal definition of the FLE’s rule base. The presented method is tested by the accurate simulation, and it is proved that the proposed method is quite capable of reducing the commutation current pulsation and improving the motor output power.

     

基于矢量线性组合的直接转矩控制系统仿真

针对传统直接转矩控制存在转矩脉动大和开关频率不固定的缺点,该文提出了一种采用矢量线性组合和SVPWM调制的新型直接转矩控制方法,即由空间矢量脉宽调制（SVPWM）技术产生六个基本的和六个线性组合的定子电压空间矢量,根据转矩偏差和磁链偏差优化选择定子电压空间矢量,实现对电机转矩的控制.将该控制方法应用到异步电动机调速系统,通过系统仿真实验验证,该控制方法的输出转矩脉动小、电流谐波低、开关频率固定,调速系统有着良好的动态性能和调速精度.     

一种改进的异步电动机直接转矩控制方法

针对传统异步电动机直接转矩控制方法转矩及磁链脉动大、开关频率不固定的缺点,提出了一种改进的异步电动机空间矢量调制直接转矩控制方法。该方法通过转矩角闭环控制实现定子磁链幅值和相角的解耦,从而获得参考电压空间矢量,实现对磁链误差和转矩误差的控制。仿真结果表明,该方法有效地克服了传统直接转矩控制方法的缺陷,获得了良好的动态响应性能。     

磁链跟踪PWM感应电机矢量控制系统

PWM调制方式及控制器参数对感应电机矢量控制系统性能有较大影响,使电机在低速时电流脉动和转矩脉动较大。以磁链、转矩闭环的电机矢量控制方法为基础,提出了磁链跟踪控制(Space Vector PWM,SVPWM)的感应电机矢量控制系统仿真模型及低速变控制器参数的控制方法,高度模拟实际系统,并考虑逆变器死区时间的影响,在不同的调速范围下,进行了系统性能分析。在转子磁链定向准确,转子磁链构造准确的前提下,仿真结果表明磁链跟踪控制的矢量控制系统跟踪磁链为准圆形,在低速下,电机电流脉动和转矩脉动都比较小,使系统能够稳定运行,对于解决感应电机高性能调速的低速问题给出了可行的途径。     

Model reference controlled separately excited DC motor

This research article proposes the speed control of a separately excited DC motor (SEDM) in the constant torque region. The novelty of this article lies in the application of artificial neural network-based model reference controller (MRC) for the speed control of SEDM. This paper also discusses and compares the speed control systems of SEDM using PI-controlled and fuzzy logic-controlled chopper circuit with MRC. The entire system has been modeled using MATLAB 7.0/SIMULINK toolbox. It has been observed that chopper-controlled speed control system could be eliminated by the use of MRC and the performance of the proposed system is comparable with speed control system using chopper circuit.     

基于ANSYS的工业机器人PMSM转矩波动抑制技术

针对当前PMSM控制技术在抑制PMSM转矩波动的过程中,容易受到磁链波动的影响,导致输出绕组电流范围较小,PMSM转矩波动抑制效果差的问题,提出了基于ANSYS的工业机器人PMSM转矩波动抑制技术;通过分析工业机器人机械臂模态结构和静力模型,设计封闭曲柄差动轮系的摆线针轮减速器的传动装置,利用腕部驱动结构,实现工业机器人转动和直线升降运动;分析PMSM转矩波动惯量及力矩,根据PMSM工作流程,为PMSM提供稳定的交流电流;通过构建PMSM数学模型,运用ANSYS有限元分析软件中宏命令,确定磁链矢量方向及定子同步旋转坐标系,对PMSM电机电磁转矩、磁链和转动力矩进行计算,结合转矩方程抑制波动,通过引入负载角改善电机运行性能,实现PMSM转矩波动抑制;实验结果表明,基于ANSYS的工业机器人PMSM转矩波动抑制技术抑制后最高输出绕组电流为24 A,最低为-22 A,与理想输出结果一致,能够有效增大输出绕组电流范围,具有较好的PMSM转矩波动抑制效果.