共查询到20条相似文献,搜索用时 74 毫秒
1.
2.
3.
针对永磁直线电动机参数变化和外部扰动对伺服系统的影响,提出了自适应变结构位置控制设计方法。用电动机的位置误差信号及其导数构造切换函数,利用自适应律对系统不确定性扰动因数的极限进行估算。经过分析验证,与基于SVPWM的矢量控制系统相比较,自适应变结构位置控制算法明显减少了系统参数变化和外部扰动引起的推力脉动,能快速准确地跟踪给定信号,增强了整个系统的自适应性和鲁棒性。 相似文献
4.
针对数控机床用永磁直线同步电动机(PMLSM)伺服系统中存在非线性,且易受外界干扰导致控制困难的问题,基于PMLSM工作原理建立了相应矢量控制数学模型,设计了CMAC(Cerebellar Model Articulation Controller,小脑模型关联控制器)+PID的PMLSM伺服系统控制方案,对控制器的跟踪性能以及抗干扰能力进行仿真。结果表明基于CMAC的复合控制器具有良好的动态跟踪性能和较强的鲁棒适应性,是解决非线性、强耦合的PMLSM控制问题的一种简便有效的控制算法。 相似文献
5.
根据垂直运动永磁直线同步电动机的特点及数学模型,建立了系统的仿真模型,并初步把模糊控制策略引入到控制系统中,实现电机的速度控制.仿真实验结果表明,和PI控制比较,引入模糊控制策略的系统具有良好的控制特性,有效地提高了永磁直线电机垂直运输系统运行的稳定性、可靠性. 相似文献
6.
根据磁悬浮永磁直线电动机的特殊结构与运行机理,给出了电动机电磁推力和悬浮力的数学模型。建立了磁悬浮永磁直线电动机的有限元计算模型,对气隙磁密、电磁推力和悬浮力进行了有限元计算,并对气隙磁密作了谐波分析。设计了磁悬浮永磁直线电动机的研究样机,制作了磁悬浮子系统和进给伺服子系统,对系统进行实验研究,获得了磁悬浮子系统和进给子系统运行的实验结果。实验研究结果表明,该磁悬浮永磁直线电动机可实现直接驱动与无摩擦运行。 相似文献
7.
8.
推力波动是影响永磁直线同步电动机(PMLSM)应用的主要原因.为了实现对永磁直线同步电动机的推力波动进行补偿及抑制,在对影响推力波动的主要因素即纹波扰动、齿槽效应、端部效应等进行详细分析的基础上,总结并阐述了目前优化和抑制推力波动的策略. 相似文献
9.
永磁同步直线电动机冷却系统结构设计 总被引:3,自引:0,他引:3
永磁同步直线电动机运行过程中产生大量的热量,严重影响电动机的正常运行。现提出一种结构简单、性能可靠的电动机水冷冷却系统。在设计中采用Ansys有限元分析软件对永磁同步直线电动机进行了三维温度场计算,清晰展示出电动机内部各部分的温度以及整个电动机的温度曲线。针对该温度场,设计相应的水冷冷却结构,并再次模拟仿真出带冷却系统的电动机温度场分布。最后通过温升实验,验证了计算结果,并证明上述水冷冷却结构的工程可行性,解决了长期困扰中国大功率直线电动机发热严重的问题。 相似文献
10.
11.
In this paper, a robust finite-time chaos synchronization scheme is proposed for two uncertain third-order permanent magnet synchronous motors (PMSMs). The whole synchronization error system is divided into two cascaded subsystems: a first-order subsystem and a second-order subsystem. For the first subsystem, we design a finite-time controller based on the finite-time Lyapunov stability theory. Then, according to the backstepping idea and the adding a power integrator technique, a second finite-time controller is constructed recursively for the second subsystem. No exogenous forces are required in the controllers design but only the direct-axis (d-axis) and the quadrature-axis (q-axis) stator voltages are used as manipulated variables. Comparative simulations are provided to show the effectiveness and superior performance of the proposed method. 相似文献
12.
In this paper, two coupling permanent magnet synchronous motors system with nonlinear constraints is studied. First of all, the mathematical model of the system is established according to the engineering practices, in which the dynamic model of motor and the nonlinear coupling effect between two motors are considered. In order to keep the two motors synchronization, a synchronization controller based on load observer is designed via cross-coupling idea and interval matrix. Moreover, speed, position and current signals of two motor all are taken as self-feedback signal as well as cross-feedback signal in the proposed controller, which is conducive to improving the dynamical performance and the synchronization performance of the system. The proposed control strategy is verified by simulation via Matlab/Simulink program. The simulation results show that the proposed control method has a better control performance, especially synchronization performance, than that of the conventional PI controller. 相似文献
13.
步进电机是增量运动控制系统的主要执行机构。如果采用合适的驱动方式,永磁同步电机(Permanent Magnet Synchronous Motor,PMSM)和步进电机(Stepping Motor)都可以工作在步进模式。主要研究永磁同步电机的开环步进驱动器的理论和方法。通过对永磁同步电机的驱动方式的深入研究发现,在其驱动器中引入一种新型开环脉冲宽度调制(Pulse Width Modulated,PWM)死区时间补偿方法,就可以改善永磁同步电机绕组电流的控制精度,从而也进一步提高了永磁同步电机在步进驱动模式下步距的控制精度。 相似文献
14.
In this paper, we address the problem relating to the precision control of permanent magnet linear motors to track repeated motion trajectories. A high gain disturbance compensator is developed to improve the control performance degraded due to the presence of significant disturbances. An inverse gain of the overall system model is used to set up a disturbance observer. The observed disturbance is then used to generate a "knocker" signal, to be augmented to the control signal, which can provide the additional energy necessary to overcome the effects of the disturbances. A learning scheme is used to adjust the knocker signal iteratively over the repeated cycles. Simulation and experimental results are furnished to demonstrate the effectiveness of the proposed control scheme. 相似文献
15.
Permanent magnet ac (PMAC) motors have existed in various configurations for many years. The advent of rare-earth magnets and their associated highly elevated levels of magnetic flux makes the permanent magnet motor attractive for many high performance applications from computer disk drives to all electric racing cars. The use of batteries as a prime storage element carries a cost penalty in terms of the unladen weight of the vehicle. Minimizing this cost function requires the minimum electric motor size and weight to be specified, while still retaining acceptable levels of output torque. This tradeoff can be achieved by applying a technique known as flux weakening which will be investigated in this paper. The technique allows the speed range of a PMAC motor to be greatly increased, giving a constant power range of more than 4:1. A dynamic model reference controller is presented which has advantages in ease of implementation, and is particularly suited to dynamic low inertia applications such as clutchless gear changing in high performance electric vehicles. The benefits of this approach are to maximize the torque speed envelope of the motor, particularly advantageous when considering low inertia operation. The controller is examined experimentally, confirming the predicted performance. 相似文献
16.
Chung-Feng Jeffrey Kuo Chih-Hui Hsu 《The International Journal of Advanced Manufacturing Technology》2006,28(9):942-949
Precise control of vibration modes become critical when one wants to push the state of the art with a permanent magnet synchronous
motor (PMSM). In this paper, a complete control strategy, concerned about the design based model, controller design, and dealing
with the shaping of the system input is presented. First, a modeling analysis is performed on the vector control scheme in
the synchronously rotating reference frame that is used for controlling the PMSM. Then, the pole-placement scheme is used
to design a desirable closed-loop system. After that, the shaped input technique together with the designed controller is
considered to yield the shortest actual system input. The Matlab/Simulink software is used to perform the simulation. This
simulation results verify that the eliminated oscillation response gives much better transient performance in the aspects
of faster settling time and decreasing energy to supply for the PMSM. 相似文献
17.
针对凸极永磁同步电机,对其数学模型和定子电流最小控制方法进行了介绍,推导了定子电流最小控制方法对应的电流相角条件、基本转速和最大转矩。利用电机数学模型和不同电流控制规律建立了永磁同步电机运行性能仿真模型,避免了传统双闭环模型中控制器参数对仿真结果的影响。在此基础上深入研究了电机永磁磁链、凸极率、电枢电阻三个参数对电机基本转速、输出转矩等运行性能的影响,据此指出了电机电磁设计时应遵循的一般规律。 相似文献
18.
为实现内插式永磁同步电机包含零速在内的全速度范围内无转子位置/速度准确检测,提出了一种无传感器复合方法。在高速范围,通过对扩展反电势的估算以得到转子位置和速度,低速时采用高频信号注入法进行转子位置检测。仿真研究结果表明,两种方法的结合既能在低速时准确地观测出转子的空间位置和速度,也能保证高速运行时较快的动态响应,适合于全速范围内电机的无传感器运行。 相似文献
19.
从永磁直线电机的结构入手,分析了电机几何结构与推力的关系.引入了两极单元直线电机的概念,提出了通过对两极单元直线电机进行组合,来设计任意推力永磁直线电机的设计方法.运用该方法完成了一台推力为3000N的永磁直线电机的设计,并对样机进行了推力与定位力的测试实验,验证了设计方法的可行性. 相似文献