无刷双馈独立电源系统及其数学模型的研究

为了提高独立电源系统的质量以满足日益增长的需求,提出了一种基于无刷双馈电机的独立电源系统。首先介绍了无刷双馈电机的结构并分析了其实现变速恒频发电的原理,通过引入坐标变换矩阵,结合静止ABC轴坐标系模型,推导了无刷双馈发电机转子机械速d-q轴的数学模型,最后根据无刷双馈电机在独立电源系统中的应用特点,建立了无刷双馈发电机独立运行时的数学模型。     

无刷双馈电机控制算法综述

在分析无刷双馈电机的工作原理的基础上,详细比较分析了无刷双馈电机的基本控制算法、自适应控制算法及智能控制算法的发展现状,以及不同控制算法的优缺点和适用场合。最后展望了控制算法的发展趋势。     

无刷双馈电机专利技术发展

近年来，作为可再生能源的风力发电受到了全球范围的广泛关注，人们越来越重视适用于风力发电的新型电机，无刷双馈电机以其简单的结构，高可靠性，具有异步和同步电机两种电机的综合特点，通过控制激磁绕组的电压和频率易于实现变速恒压恒频发电，是一种适合风力发电运行环境的新型电机。本文主要以DWPI、SIPOABS专利数据库以及CNTXT数据库中的检索结果为分析样本，从专利文献的视角对无刷双馈电机的发展进行了全面的统计分析，总结了与无刷双馈电机相关的国内和国外专利的申请趋势、主要申请人分布以及其转子结构的发展路线做了一定的分析，并从中得到一定的规律。     

变速恒频无刷双馈风力发电机的仿真研究

在介绍无刷双馈发电机及其变速恒频风力发电系统的基础上,基于无刷双馈电机转子参考轴d-q数学模型,采用恒压频比控制策略,在Matlab/Simulink下完成无刷双馈变速恒频发电控制的开环仿真研究。仿真结果验证了无刷双馈发电机变速恒频控制技术的正确性与有效性。     

微特电机

0600290 笼型转子无刷双馈电机d-q模型与控制特性仿真[刊, 中]／黄靖／／海军工程大学学报．-2005,17(5)．-86- 91(G) 无刷双馈电机是一种新型的适于变频调速系统使用的电机,其结构型式和工作原理与传统交流电机相比具有较大的区别。针对转子结构为笼型短路绕组的     

无刷双馈风力发电机并网运行的策略及仿真

论述在分析级联式无刷双馈电机原理的基础上,根据d-q轴数学模型,通过转子和功率绕组、控制绕组之间的坐标变换,得到同步数学模型,并在此基础上推导出无刷双馈电机数学模型。根据次模型进行仿真,仿真结果表明：并网过程中,通过改变励磁电流的大小可调节功率侧输出电压的幅值,从而可实现变速恒频。     

基于垂直轴双馈风力发电系统的仿真研究

以垂直轴风轮（VAWT）和双馈感应发电机（DFIG）为研究对象,建立了包括风力机模型、传动系统模型和双馈电机模型的垂直轴双馈风力发电系统的数学模型及结构,采用双馈电机定子磁链定向前馈解耦控制,使得电机的有功分量和无功分量可以分别得到控制。运用Matlab/Simulink建立了系统仿真模型,对定子磁链定向前馈解耦控制策...     

风电系统双馈电机LPV模型的稳定性分析

本文d-q-θ在坐标系下双馈电机数学模型的基础上建立了依赖于风电系统双馈电机滑差角速度的LPV模型,并用鲁棒控制中二次稳定和多胞型的思想分析了判断该模型稳定性的方法,并以一实例验证了该方法的可行性,利用Matlab中的Toolbox进行了仿真,为双馈电机控制器的进一步研究奠定了基础.     

双三电平变频器双馈风力发电控制策略研究

为提高风力发电系统中双馈电机控制效果,需对电机的有功和无功分量分别进行控制,并进行前馈解耦控制。本文以矢量控制理论为基础,采用AC/DC/AC的拓扑结构,构建了双馈电机控制用双三电平变频器。逆变部分采用简化三电平SVPwM算法,通过动态改变开关次序和调整小矢量作用时间实现对中点电位的有效控制。双馈系统采用双闭环控制结构...     

基于双级矩阵变换器的双馈电机控制

以双馈电机为研究对象,结合双级矩阵变换器和矢量控制的优点,建立了双级矩阵变换器励磁的定子磁场定向控制系统模型。同时导出了定子磁场定向的双馈电机的数学模型,给出了以转速控制为外环,以转子电流控制为内环的双闭环控制系统的设计方法。该系统中的变频器装置可用双级矩阵变换器代替。计算机仿真证明,其双馈电机的转速在一定范围内从亚同步速到超同步速任意可调,从而体现了系统的优良特性。     

Determination of converter control algorithms for brushlessdoubly-fed induction motor drives using Floquet and Lyapunov techniques

This paper presents a method of analyzing the stability of brushless doubly-fed machines (BDFM) in the synchronous mode of operation. Unlike the stability analysis of conventional induction and synchronous machines for which the linearized state equations are time-invariant, the linearized state equations of the BDFM are time-varying and, consequently, their eigenvalue analysis cannot be performed directly. However, since the system matrix of the linearized equations is a periodic function of time, the generalized theory of Floquet can be applied to transform the time-varying system of equations into an equivalent set of equations with a constant system matrix. Eigenvalue analysis can then be employed to analyze the stability characteristics of given equilibrium points. Investigation into the stability of a proof-of-concept BDFM in the synchronous mode of operation using the transformed linearized model shows good correlation between theoretical and experimental results. In addition, the possibility of designing a BDFM drive with inherent open-loop stability over the entire speed range is demonstrated. Finally, under stable steady state synchronous operation, power converter control methods are discussed and it is shown that scalar control methodologies similar to those for induction motor drives can be applied to the BDFM     

Experimental evaluation of a rotor flux oriented control algorithmfor brushless doubly-fed machines

The brushless doubly-fed machine (BDFM) has shown potential for adjustable speed drive applications. Although the BDFM is readily applicable for industrial drives requiring only slow speed response, control methods for higher performance operation need to be explored. With the help of a suitable synchronous reference frame dq model, this paper defines a BDFM synchronous angle and employs an electric torque estimator to establish a rotor flux oriented control algorithm. Experimental results show the effectiveness of the proposed controller     

Pushy motors [piezoelectric motors]

A motor using a piezoelectric instead of electromagnetic driving mechanism gives very high torque at low speeds and allows very precise positioning. The author describes the operating principles of piezoelectric motors using PZT ceramics. The design of the motors is then described. The design of the travelling wave motor to overcome the unidirectional problem of piezoelectric motors is described. The main features, advantages and drawbacks of piezoelectric motors are discussed     

Linear Motor-Powered Transportation: History, Present Status, and Future Outlook

An outline of the different fields of application for linear motors in transportation is given. The different types of linear motors are described and compared. The current status of the different linear motors used in the transportation sector is analyzed. Finally, a look at worldwide activities and future prospects is presented.      

超声电机驱动关节机器人位置反馈控制研究

利用超声电机低速大转矩特性,实现了三关节机器人的直接驱动;通过改变超声电机的工作频率实现对其运行速度的控制。结合超声电机的运行特点,运用和比较了多种PID位置反馈控制方式,实践证明,在确保超声电机和机器人工作平稳的前提下,采用梯形积分的PID位置反馈控制效果最好。     

Magnetically levitated micro PM motors by two types of activemagnetic bearings

This paper describes magnetically levitated micro permanent magnet (PM) motors by two types of active magnetic bearings. The micro PM motors consist of a cylindrical rotor (φ2.0 mm×10 mm), a pair of electromagnets, a pair of photodiodes, and an analog PD controller. The motors are characterized by the small rotor levitated without any mechanical contacts and one-axis controlled active magnetic bearing. Horseshoe-shaped and cylindrical electromagnets are applied to the active magnetic bearing. The rotor successfully rotates, levitating in the center of the electromagnets. In this paper, dynamic characteristics of the two types of micro PM motors, such as relationships between rotation speed and driving current, rotation speed and time, and acceleration and driving current, are discussed. As a result, it is found that the magnetically levitated micro PM motors by two types of active magnetic bearings are very different from each other and very promising     

超声电机温升、结构参数和输出特性的相互关系

通过超声电机温度特性实验,分析超声电机产生热量的途径;研究预压力和摩擦层厚度对超声电机温升、运行转速和堵转力矩的影响规律;提出估计温升、转速和堵转力矩关系的经验公式。研究有助于控制温升,改善电机运行特性。     

Linear electric machines—A personal view

The history of linear motors is a history of shape. Once having departed from the cylindrical geometry of rotating machines, a wider world of three-dimensional design becomes possible. Linear induction motors dominate the field of linear drives to the same extent as does the rotary induction machine in relation to more complicated adjustable-speed motors. It is therefore thought appropriate to devote only one section to linear motors other than induction. A fairly full treatment of electromagnetic levitation is also included together with a treatment of oscillating machines. Perhaps the most important features are the division of electrical machines into two classes which are termed "magnetic" and "electromagnetic" and the "topological explosion" which is at present taking place in linear motor design. Some linear machines are already well established on a commercial basis but the vast bulk of recent inventions still remain to be exploited.     

卫星通信地球站系统驱动电动机的选择

卫星通信地球站天线驱动电动机的选择需从机械、电子和伺服控制等方面综合考虑,其难度较大且至关重要。具体分析各类卫星通信地球站天线选择驱动电动机的依据,对卫星通信地球站天线驱动电动机的选择有一定参考价值。