共查询到19条相似文献，搜索用时 140 毫秒
1.
使用增量式光电编码器测量电机位置的伺服系统中,在电机启动时,普遍存在无法测量出电机转轴初始位置的问题。本文提出一种基于增量式光电编码器A,B脉冲信号,通过输出给定位置的定子电流矢量,来精确检测转子初始位置的方法。整套算法在DSP与FPGA硬件平台上进行了验证,实验表明,该方法可以在永磁同步电动机启动之前精确计算出转子的初始位置,实现电机最大转矩启动。 相似文献
2.
为实现高性能的永磁同步伺服系统,永磁同步电机转子的初始定位十分重要,转子初始定位直接关系到伺服系统的控制精度和性能。介绍了一种利用增量式光电编码器实现高精度转子初始定位的方法。 相似文献
3.
异步电机矢量控制策略需了解转子转速信息以实现磁场定向,为了该目的,本文提出了应用扩展卡尔曼滤波(EKF)观测器在电机断电情况下对转子的速度进行检测。EKF很好的实现了转速的检测。但是异步电机是一个非线性,含有参数变化和扰动的系统。因此本文分析了EKF对电机参数变化之鲁棒性并提出两种方法来提高观测器鲁棒性。仿真结果表明,这两种方法对EKF的检测误差起到了很好的修正作用。 相似文献
4.
5.
给出了永磁同步电机的工作原理和数学模型,介绍了永磁同步电机的矢量控制方法。针对转子位置影响电机控制精度的问题,给出了一种简单的转子位置实时估计方法,克服了传统的有位置传感器的缺点。为了提高转子位置检测精度,利用线反电势过零点信号对转子位置估计值进行校正,提高了转子位置估计的准确性与可靠性,而且不需要电机提供中线,实验结果表明,本文所提的方法能够有效地实现永磁同步电机无位置传感器条件下的矢量控制。 相似文献
6.
7.
8.
9.
本文介绍采用扩展卡尔曼滤波对直流无刷电动机、无速度传感器矢量控制系统进行实时估算转子位置和转速,内容主要涉及非线性离散系统卡尔曼滤波算法的数学模型和改进后的数学模型的建立,及其对转子位置和转速的估计. 相似文献
10.
由于电机间接转子位置角度估计方法中存在一定误差，采用一般的控制策略难以实现电机性能的良好控制，为了提高电机的转速控制精度和抑制转矩脉动，在分析开关屈阻电机的非线性数学模型的基础上，研究了模糊转子位置估算方法，电机速度的模糊控制策略和转矩脉动的抑制方法。采用MATLAB6、1对控制系统进行了仿真研究，并采用了高速数字信号处理器TMS-520C52作为控制单元，设计了电机模糊速度控制器，用以实现对电机的速度控制。对：3kW、8／6极、M500rpm的电机仿真和实验研究表明电机的静态和动态调速性能良好。 相似文献
11.
伺服电动机又称执行电动机,在自动控制系统中,用作执行元件,把所收到的电信号转换成电动机轴上的角位移或角速度输出。交流伺服电动机要克服自转现象,可通过把转子电阻设计足够大,其目的就是使转子在转动时产生制动转矩,在控制绕组不加电压时,能及时制动,消除自转现象。 相似文献
12.
13.
转子一向是发电机的重要部件,随着我国电力工业的发展,电力系统本身变得越来越庞大和复杂,为了确保发电厂的发电机组的可靠和经济地运行,保证转子的安全,如何防止和及时发现转子接地故障一直受到发电企业的广泛关注。今通过对两种不同冷却方式(包括双水内冷与空气循环风冷)的发电机转子对地电压测量问题的探讨,找出有效准确的测量方法,加强正常运行时对转子绝缘的监控。 相似文献
14.
通过介绍空间电压矢量脉宽调制(SVPWM)控制策略在无速度传感器矢量控制系统中的实现,在此基础上给出了基于DSP的全数字化调速系统,并分别建立了改进的电压型转子磁链观测模型和PI自适应速度估算模型。实验结果表明:所采用的控制方法正确可行,控制系统具有良好的性能。 相似文献
15.
Oscar Barambones 《Journal of The Franklin Institute》2013,350(10):3441-3447
This short communication is a discussion of the paper entitled “Adaptive sliding-mode-observer for sensorless induction motor drive using two-time-scale approach” by A. Mezouar, M.K. Fellah and S. Hadjeri published in the Simulation Modelling Practice and Theory 16 (2008) 1323–1336. In the discussed paper the authors present a current and flux sliding mode observer for the induction motor that also incorporates an adaptive laws in order to estimate the rotor speed and the inverse of the rotor time constant. However the proposed design for the observer and for the adaptive laws, employs the real value of the rotor time constant and the real value of the rotor speed, which are unknown, and therefore cannot be used in the observer design nor in the adaptive laws design. 相似文献
16.
Mohamed Assaad Hamida Alain Glumineau Jesus de Leon 《Journal of The Franklin Institute》2012,349(5):1734-1757
In this paper, a sensorless speed control for interior permanent magnet synchronous motors (IPMSM) is designed by combining a robust backstepping controller with integral actions and an adaptive interconnected observer. The IPMSM control design generally requires rotor position measurement. Then, to eliminate this sensor, an adaptive interconnected observer is designed to estimate the rotor position and the speed. Moreover, a robust nonlinear control based on the backstepping algorithm is designed where an integral action is introduced in order to improve the robust properties of the controller. The stability of the closed-loop system with the observer–controller scheme is analyzed and sufficient conditions are given to prove the practical stability. Simulation results are shown to illustrate the performance of the proposed scheme under parametric uncertainties and low speed. Furthermore, the proposed integral backstepping control is compared with the classical backstepping controller. 相似文献
17.
Jediael Machín Almeida Alexander G. Loukianov José M. Cañedo Castañeda Jorge Rivera Dominguez 《Journal of The Franklin Institute》2018,355(7):3221-3248
Using a nonlinear complete order model of a synchronous motor, a robust second order sliding mode observer based control scheme is proposed. For that, a generalized super-twisting 3rd order observer is proposed for nonlinear systems. Based on the proposed observer scheme, a robust rotor flux observer is designed, then, a stator current observer is proposed using a classical super-twisting algorithm for extracting information of the rotor speed by means of the equivalent control method. The control design for the output tracking of a desired reference signal for the rotor speed is carried out with a classical super-twisting sliding mode algorithm and adaptive backstepping techniques. Due to the number of inputs, the flux in the excitation winding, and the direct component of the stator currents are also regulated. Numeric simulations predict a good performance of the closed-loop synchronous motor with parameter variations. 相似文献
18.
Yong-Chao Liu Salah Laghrouche Abdoul N'Diaye Maurizio Cirrincione 《Journal of The Franklin Institute》2021,358(1):400-427
This paper proposes a novel Hermite neural network-based second-order sliding-mode (HNN-SOSM) control strategy for the synchronous reluctance motor (SynRM) drive system. The proposed HNN-SOSM control strategy is a nonlinear vector control strategy consisting of the speed control loop and the current control loop. The speed control loop adopts a composite speed controller, which is composed of three components: 1) a standard super-twisting algorithm-based SOSM (STA-SOSM) controller for achieving the rotor angular speed tracking control, 2) a HNN-based disturbance estimator (HNN-DE) for compensating the lumped disturbance, which is composed of external disturbances and parametric uncertainties, and 3) an error compensator for compensating the approximation error of the HNN-DE. The learning laws for the HNN-DE and the error compensator are derived by the Lyapunov synthesis approach. In the current control loop, considering the magnetic saturation effect, two composite current controllers, each of which comprises two standard STA-SOSM controllers, are designed to make direct and quadrature axes stator current components in the rotor reference frame track their references, respectively. Comparative hardware-in-the-loop (HIL) tests between the proposed HNN-SOSM control strategy and the conventional STA-SOSM control strategy for the SynRM drive system are performed. The results of the HIL tests validate the feasibility and the superiority of the proposed HNN-SOSM control strategy. 相似文献
19.
介绍了基于AT89S52单片机,利用红外传感器直流电机的转速,控制直流电机的转动速度,用PWM调速方式控制直流电机转动的速度,以及停止转动,并可以自动调节速度至预先设定的速度。整个系统的电路逻辑结构简单,可靠性高,实现功能强。 相似文献