Precise positioning using electrostatic glass motor

This paper reports the application of electrostatic glass motors to precise positioning. It will be shown that by drawing advantage of a property of glasses, the relatively stable charge arrangements on its surface induced by an electrostatic field, sub-micrometric and sub-arc sec displacements can be achieved. Based on this principle, a stage featuring two linear and one rotative degree-of-freedom will be proposed. Its potential is experimentally determined on one rotative degree-of-freedom. The main advantages of the proposed novel form of positioning are its long stroke, compactness and simplicity.     

Modeling and identification of an electrostatic motor

The present study describes modeling and parameter identification for a high-power electrostatic motor. The motor is a synchronous motor with six phases that is modeled by a six-terminal capacitance network. A method to measure the capacitance coefficient matrix of a network using an LCR tester is proposed and demonstrated. The thrust force of the motor is shown analytically using the proposed model, which shows good agreement with empirical measurements of the motor behavior. Based on the proposed model, the effect of electrode skew is analyzed for force ripple reduction. Using the analysis, a skew motor is fabricated and tested, with the results demonstrating that a skewing electrode with a skew factor π can considerably reduce thrust force ripple.     

同步电动机智能化启动控制

针对电励磁同步电动机在启动过程中存在不能准确投励、不能有效灭磁和启动脉动电流较大等问题,提出了以单片机为控制核心,通过对滑差信号的检测来决定投全压与投励磁电流时刻,实现了同步电动机的智能化启动,并深入分析了它的启动控制原理。该控制方法能克服电励磁同步电动机启动时存在的问题,实现了励磁系统的顺极性准确投励,且具有良好的灭磁功能,能使同步电动机可靠启动。     

永磁同步电机运行性能研究

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。     

空压机同步电动机控制系统故障的排除方法

针对中小型空压机同步电动机控制系统和保护中常见故障及处理方法，阐明同步电动机起动的概念、方式、保护动作、励磁故障原因以及解决方法。     

Passivity-based current controller design for a permanent-magnet synchronous motor

The control of a permanent-magnet synchronous motor is a nontrivial issue in AC drives, because of its nonlinear dynamics and time-varying parameters. Within this paper, a new passivity-based controller designed to force the motor to track time-varying speed and torque trajectories is presented. Its design avoids the use of the Euler–Lagrange model and destructuring since it uses a flux-based dq modelling, independent of the rotor angular position. This dq model is obtained through the three-phase abc model of the motor, using a Park transform. The proposed control law does not compensate the model’s workless force terms which appear in the machine’s dq model, as they have no effect on the system’s energy balance and they do not influence the system’s stability properties. Another feature is that the cancellation of the plant’s primary dynamics and nonlinearities is not done by exact zeroing, but by imposing a desired damped transient. The effectiveness of the proposed control is illustrated by numerical simulation results.     

Fuzzy-PID多模态控制器在永磁同步电机中的应用

传统的永磁同步电机矢量控制系统采用比例积分（PI）速度控制器,其动态响应性能比较差。针对这一问题,设计了一种基于Fuzzy—PID的多模态自适应控制器,作为永磁同步电机矢量调控系统的速度调节器。这种控制器可以利用模糊逻辑处理不确定信息,对速度控制器的输出进行实时校正。仿真结果表明：利用该控制器建立的矢量控制系统不仅结构简单,而且具有良好的动、静态特性。     

Precise speed control of a permanent magnet synchronous motor

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.     

基于VB的永磁同步电机设计及优化平台

为解决传统永磁同步电机由于设计计算和查表工作复杂、耗时长、计算修正参数过多而导致精确性较差等的问题,将禁忌算法和模糊控制应用到传统永磁同步电机设计中,利用Visual Basic编写程序,对永磁电机磁路法设计过程进行了编程,建立了动定子结构尺寸和电机工作特性曲线之间的关系,提出了一种优化电机效率和功率因素,调整电机结构尺寸的方法;利用有限元软件对永磁同步电机的电感、功率等几个重要参数加以验证,并进行了瞬态仿真试验。仿真试验结果表明,该优化方法可提高电机的功率因素和效率,减小定子的电流密度,并可有效地优化永磁同步电机。     

Precise speed control of a permanent magnet synchronous motor

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.     

永磁同步直线电动机电感测试方法

电感不仅是电动机的一个重要参数,而且对控制系统中的电流环有重要影响.针对目前电感测试方法的缺点,提出一种动态测试方法.该方法是以电路的自激振荡理论为原理,通过设计一个LC振荡电路将电感的测量转换为频率的测量;最后,经电路处理将电感量的变化动态地反映在电压的变化上,从而实现动态测量.     

混合式永磁同步电机弱磁性能的研究

针对传统永磁同步电机弱磁性能不佳的问题,提出了应用混合式结构来改善永磁同步电机弱磁性能。研究了传统永磁同步电机的结构,得出了传统永磁同步电机弱磁困难的原因是电枢磁势和转子励磁磁势的不对等。分析了混合式永磁同步电机的结构,得出了其转子永磁体用量少,励磁磁势较小;气隙很小同步电感大,短路电流与额定电流的比值小。介绍了应用短路电流与额定电流的比值来判断永磁同步电机弱磁性能的方法,分析得出了混合式结构弱磁性能要好于传统永磁同步电机。采用了基于直轴电流负向控制的附加闭环方法进行弱磁控制,对传统永磁同步电机和混合式永磁同步电机的弱磁性能进行了对比实验,混合式结构的弱磁扩速倍数为传统式结构的2.63倍。研究结果表明,混合式结构可以有效提升永磁同步电机弱磁性能。     

基于DSP的永磁同步电机伺服系统

设计了一套基于DSP的永磁同步电机伺服系统。系统为速度环和电流环双闭环控制结构,采用了SVPWM控制策略。以DSP为核心设计了硬件电路,运用C语言进行了软件设计,实现了对永磁同步电机的伺服控制。     

永磁同步电动机的开环步进驱动器的研究

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。     

基于永磁同步电机的太阳能跟踪系统研究

提高光伏电池、光伏逆变器的效率非常困难,而通过控制太阳能支架,让太阳能板接受最大的辐射能量则可较大幅度提高太阳能的利用效率.本文通过采用永磁同步电机驱动控制系统实现了太阳能板接受太阳光辐射能量的提高.采用滑模控制系统又能够增强系统自适应性和鲁棒性,消除系统抖振现象,这对于提高驱动系统的平稳性和跟踪性能具有重要的应用价值.     

永磁同步电动机无传感器控制方法综述

介绍了近些年提出的永磁同步电动机无传感器控制方案,同时也指出了它们的优缺点,最后提出了永磁同步电动机无传感器控制今后的发展方向.     

一种永磁直线同步电动机的实验和测试装置

介绍了一种直线电动机的综合测试台。介绍了测试台的机械结构、结构原理和功能模块,以及一种永磁同步直线电动机的测试结果。     

永磁同步电动机驱动的结晶器非正弦振动

在分析德马克非正弦产生机理基础上,开发了一种由永磁同步电动机(PMSM)驱动的结晶器非正弦振动发生装置,构造了其电控系统,可实现波形偏斜率的在线可调,推导了德马克非正弦波形偏斜率的解析解,波形仿真验证了该装置的正确性.     

永磁同步电机在电梯系统中的应用分析

重点介绍了永磁同步电机在电梯驱动系统中引发的重大技术革新与技术优势,通过对永磁同步电动机在智能化、安全化、节能化曳引系统中的作用的分析,说明了永磁同步电动机在技术方面所具备的明显技术优势,指出其在电梯设计和应用中起到的重要现实意义。     

永磁同步直线电动机冷却系统结构设计

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。