无刷直流电机直接转矩神经模糊控制研究

为简化无刷直流电机控制系统结构的同时又能使其具有较快的转矩响应速度,提出一种适用于无刷直流电机直接转矩控制的神经网络模糊推理控制方案,用神经网络定子磁链观测器取代传统的定子磁链观测器,采用模糊控制算法设计逆变器开关状态选择器。利用MATLAB对系统两种不同控制方法的仿真实验结果进行比较,通过比较得出,本文的控制方法转矩、转速、磁链响应快、脉动小,具有优良的稳定跟踪性能和较快的动态响应,具有一定的工程研究价值。     

自适应GA-ADRC在无刷直流电机转矩脉动抑制中的研究

提出一种新型的无刷直流电机电磁转矩脉动抑制方法,该方法通过控制无刷直流电机导通相线电流跟踪给定电流来抑制电机的电磁转矩脉动.首先分析无刷直流电机数学模型,建立基于自适应遗传算法的无刷直流电机控制系统模型,由于自适应GA-ADRC控制器不需要无刷直流电机模型参数就可以实现干扰补偿,因此可以独立设计自适应GA-ADRC控制器.对文中所提出自适应GA-ADRC控制算法与经典PID控制算法的控制效果对比分析,控制效果明显优于传统PID控制效果.     

永磁无刷直流电机换相转矩分析

介绍了人工心脏轴流式血泵永磁无刷直流电机换相转矩脉动变化过程．根据影响电机换相转矩脉动的因素,给出了减小电机转矩脉动的解决方案,以使电机运行更加平稳．通过实验波形证实本结论分析正确,可以为电机减小转矩脉动作为参考．     

一种新的空间矢量控制方法在无刷直流电机中的应用

根据无刷直流电机的工作原理,提出了一种新的计算空间矢量的控制方法。利用霍尔检测并估算转子的位置,可以使普通的方波控制器不需要做任何硬件修改,按照此方法达到空间矢量控制的效果。该方法实现简单,稳定可靠,节约了成本,具有很好的工业应用价值。     

无刷直流电机及应用研究

本对无刷直流电机的基本原理进行了论述,分析了无刷直流电机的基本结构和转矩特性,介绍其控制原理和在伺服系统的典型应用。     

十二状态无刷直流电机控制研究

利用相序图,阐述了无刷直流电机两相三相轮流导通十二状态控制方法。借助Ansoft软件,对两相三相轮流导通十二状态控制法和两相导通六状态控制法进行了仿真分析,仿真结果表明,十二状态控制法,电机相电压更接近正弦波,电流谐波较小。利用75W电机进行了对比实验,实验结果显示十二状态控制法,电机电流接近正弦波形,而两相导通六状态控制法为梯形,十二状态控制法电机性能优于两相导通六状态控制法。     

无刷直流电机的模糊调速控制研究

无刷直流电机(BLDcM)的动力学特性是一个高阶、非线性、强耦合的系统,采用传统的PID控制方法进行控制,难以达到理想的控制效果.采用模糊控制理论与常规PID控制相结合组成模糊PlD控制器,应用模糊算法在线自动整定PID参数的方法,并将其应用于无刷直流电动机调速控制系统.仿真与试验结果表明,该模糊PID控制的效果明显优于常规PID控制和模糊控制,具有无超调、响应快、鲁棒性强等特点,从而验证所用控制方法的可行性.     

无刷直流电机位置伺服智能控制方法研究

针对多变量、非线性、时变的无刷直流电机位置伺服控制系统的特点,提出一种基于免疫遗传算法的递归模糊神经网络控制器的设计方法,并应用于无刷直流电机三闭环控制系统的位置调节器中,实现系统精确的位置控制.仿真结果表明,递归模糊神经网络控制器明显优于PID控制器.     

基于广义预测控制的无刷直流电机控制研究

提出基于广义预测控制(generalized predictive control,GPC)的无刷直流电机控制方法,采用双闭环结构的无刷直流电机控制系统,其中外环为GPC转速控制器,它以电机、逆变器等结构为被控对象,将给定转速、实时转速、实时电流作为输入,输出电流值作为内环控制器的输入;内环采用电流滞环控制,其输出作为逆变器的输入。使用Matlab搭建仿真模块并运行后,证明该方法模型要求低、抗干扰性强、控制效果良好。     

基于DSP的无刷直流电机控制系统设计

随着电力测控技术以及电子技术的飞速发展,无刷直流电机得到了广泛应用,其体积相对较小、运行效率较高、运行平稳可靠、维护十分便捷,凭借这一系列优势,无刷直流电机在工业控制领域应用及其广泛.本文主要阐述了基于DSP的无刷直流电机控制系统的设计,主要包括的硬件设计和软件设计两方面.所设计的控制系统主要采用触摸式一体机作为系统控制的上位机,选用专门为电机的数字控制所设计的DSP芯片TMS320LF2407A作为下位机,此芯片作为控制的核心部分,通过上位机与下位机的通讯配合完成无刷直流电机的整体控制.     

Influence of PWM Modes on Commutation Torque Ripples in Sensorless Brushless DC Motor Control System

This paper introduces four PWM modes used in the sensorless brushless DC motor control system,analyzes their different influences on the commutation torque ripple in detail,and selects the best PWM mode in four given types to reduce commutation torque ripple of Brushless OC( BLDC) motors,Simulation and experimental results show that the selection is correct and practical.     

Novel torque ripple minimization algorithm for direct torque control of induction motor drive

To elucidate the principles of notable torque and flux ripple during the steady state of the conventional direct torque control (DTC) of induction machines, the factors of influence torque variation are examined. A new torque ripple minimization algorithm is proposed. The novel method eradicated the torque ripple by imposing the required stator voltage vector in each control cycle. The M and T axial components of the stator voltage are accomplished by measuring the stator flux error and the expected incremental value of the torque at every sampling time. The maximum angle rotation allowed is obtained. Experimental results showed that the proposed method combined with the space vector pulse width modulation(SVPWM) could be implemented in most existing digital drive controllers, offering high performance in both steady and transient states of the induction drives at full speed range. The result of the present work imphes that torque fluctuation could be eliminated by imposing proper stator voltage, and the proposed scheme could not only maintain constant switching frequency for the inverter, but also solve the heating problem and current harmonics in traditional induction motor drives.     

A New Method for Reducing Commutation Torque Ripples in BLDC Motors

A new compensation method and an algorithm for compensating for the commutation torque ripples of the trapezoidal EMF brushless DC motor are put forward.Simulation and experimental results show that this method is correct and practical.     

Design and implementation of a position sensorless control method for brushless DC motors

Because brushless direct current (BLDC) motors have the advantages of a compact size, high power density, high efficiency, and long operating life time, they are widely used in many industrial products and electric traction systems. It is known that the BLDC motors have no brushes for commutation. They are commutated with electronically commutation. So, the rotor position information of the BLDC motors must be known to understand which winding will be energized according to the energizing sequence. In most of the existing BLDC motor drivers, rotor position information is detected by Hall effect sensors. This kind of mechanical position sensors will bring additional connections and costs, reliability decrease and noise increase. In order to improve the control performance and extend the range of speed regulation for BLDC motors, a position sensorless control method is proposed in this paper. In the proposed control method, rotor position information of the BLDC motors is detected from the back electromagnetic forces (back-EMFs) which are estimated by an unknown-input observer with line to line currents and line to line voltages. For the purpose of verifying the effectiveness of the proposed control method, a model is built and simulated on the Matlab/Simulink platform. The simulation results show that the speed regulation performance of BLDC motors is improved compared with using Hall effect sensors. At the same time, the reliability of the BLDC motors is improved and the costs of them are reduced because the position sensor is eliminated.     

无位置传感器无刷直流电机无反转起动方法(英文)

为了实现无位置传感器无刷直流电机的无反转起动及平滑切换,提出了一种新的无位置传感器无刷直流电机起动及切换方法.该方法依据电机定子铁芯饱和效应,采用6个短时电压脉冲检测转子初始位置,可将转子定位在60°范围内,然后采用长短电压脉冲相结合的方式加速电机同时利用电流响应的变化动态检测转子位置,当转速上升到可以检测到反电势过零点时,关闭电机驱动电路,根据端电压波形和导通相之间的对应关系确定切换时刻,可将电机平滑切换至反电动势换相运行方式.样机试验结果验证了上述方法的可行性和有效性.     

一种直流力矩电机精确控制的新方法

针对直流力矩的闭环调速控制,提出一种渐近调速算法,主要解决调速过程的快速、平稳、精确控制问题.介绍算法,并给出实现这一算法的技术方案.方案以数字信号处理器为核心,与集成马达控制器和锁相倍频测速单元共同组成闭环随动控制系统.给出驱动控制通道设计和速度反馈通道设计,并对测速单元的测量方法做出精度分析.     

基于预测控制的直接转矩控制系统的研究

针对异步电动机直接转矩控制（DTC）系统在低速时由于开关频率不稳定而引起转矩脉动较大的缺点，提出了一种预测控制方法。该方法根据转矩和定子磁链的误差来确定应该施加的参考电压矢量，最后利用空间矢量脉宽调制（SVPWM）方法来合成该矢量，这样即保证了逆变器的开关频率恒定，从而大大降低转矩脉动。仿真结果表明，在低速下定子磁链轨迹近似为圆，转矩脉动不明显。     

Application of direct torque control to electric screw presses for speeding up torque response and reducing starting current

Fast response and stable torque output are crucial to the performance of electric screw presses. This paper describes the design of a direct torque control （DTC） system for speeding up torque response and reducing the starting current of electric screw presses and its application to the J58K series of numerical control electric screw presses with a dual-motor drive. The DTC drive system encompasses speed control, torque reference control, and switching frequency control. Comparison of the DTC dual-AC induction motor drive with corresponding AC servo motor drive showed that for the J58K-315 electric screw press, the DTC drive system attains a higher maximum speed （786 r/min） within a shorter time （1.13 s） during a 250 nun stroke and undergoes smaller rise in temperature （42.0 ℃） in the motor after running for 2 h at a 12 min-1 strike frequency than the AC servo motor drive does （751 r/min within 1.19 s, and 50.6 ℃ rise）. Moreover, the DTC AC induction motor drive, with no need for a tachometer or position encoder to feed back the speed or position of the motor shaft, enjoys increased reliability in a strong-shock work environment.     

无刷直流电机转子状态检测方法与仿真

研究了电机控制的数学模型,利用扩展卡尔曼滤波器对电机转子的状态做出了最小方差估计,通过计算机仿真验证了此方法的有效性。     

无刷直流电机的控制系统设计

研究了基于单片机的永磁无刷直流电动机的速度控制系统，提出了基于C8051f330的控制方法。系统软件基于Keil C的编译环境的C语言方式。实验证明了该方法的可靠性。