基于DSP的无位置传感器无刷直流电机锁相稳速控制

介绍了一种无位置传感器无刷直流电机的锁相稳速控制系统.该系统以TI公司的TMS320LF2407A为核心控制芯片,采用反电势过零点检测法获得转子位置,通过外同步变频起动和锁相稳速控制方法分别实现了陀螺电机的启动和稳速控制.试验结果表明,用该方法控制电机起动速度快,转矩脉动小,稳速精度高.该系统已成功用于陀螺电机中.     

无位置传感器无刷直流电机的锁相稳速控制

介绍了用锁相技术实现无位置传感器无刷直流电机的高精度稳速控制 ,给出了系统框图 ,并进行了稳定性分析 ,在无位置传感器无恻直流陀螺电机中应用 ,稳速控制精度达到± 5× 10 - 6 。     

大角动量无刷直流陀螺电动机的高精度稳速研究

介绍了一种大角动量永磁无刷直流陀螺电动机的高精度稳速控制系统。在研究无刷直流陀螺电动机运行原理的基础上,应用了一种简单实用的速度闭环控制策略,并在Simulink中建立电机本体及控制模型。陀螺电动机的主控制器由硬件电路和软件程序组成。DSP和CPLD作为控制器主体,以分段PI算法为稳速控制方法,两者配合实现了软起动、过流保护和稳速控制等功能。样机试验结果表明,该控制系统起动迅速、起动可靠性高及稳速精度高。     

一种磁悬浮CMG用高速无刷直流电动机锁相高精度稳速控制系统设计方法研究

提出一种用于高速无刷直流电动机锁相速度控制器设计和参数优化方法。对锁相控制的积分环节采用了梯形公式数字积分器,与可逆计数器构成的数字积分器相比,梯形公式数字积分器具有实现简单、动态响应快、入锁范围大、抗扰动能力强等优点。在以DSP为核心的电机数字控制系统上实现了锁相稳速控制算法,并将该方法用于磁悬控制力矩陀螺高速无刷直流驱动电动机的稳速控制。实验结果表明,该方法改善了动态响应,获得了较高的稳速精度。     

高速无刷直流电机的快速锁相控制方法

作为航天器姿态控制的关键执行机构,控制力矩陀螺(CMG)转子的稳速精度是决定其输出力矩精度的重要因素之一,高速电机通常采用锁相环技术实现高精转速,但电机驱动电流的饱和非线性大幅度延长了锁相跟踪收敛时间和扰动恢复时间,严重影响稳速精度.本文建立了包含驱动饱和特性的高速无刷直流电机锁相控制系统模型,采用相平面法分析稳定性和跟踪时间,提出基于串联PD校正的快速锁相控制方法,针对该方法进行了仿真分析,锁相跟踪时间减少了90％,而且不会影响系统稳定性.仿真和实验结果验证了该方法的正确性和有效性.     

软件锁相环技术在陀螺用无刷直流电机高精度稳速控制中的应用研究

该文研究了软件锁相环技术在陀螺用无位置传感器无刷直流电机(BLDCM)稳速控制系统中的应用。研究是基于DSP通过软件算法来实现锁相功能。文章阐述了软件锁相环的工作原理、数学模型以及DSP实现方法;分析了软件锁相环的Z域模型;设计的无刷直流电机稳速控制系统用专用芯片M L 4428实现了反电势的检测,换相和功率驱动。用高速的数字信号处理器TM S320LF 2407A作为控制处理器,实现了系统的软件锁相环算法和电机的起停控制、转速给定和转速检测,具有较高的稳速精度。     

无刷直流电动机全数字锁相稳速控制系统

设计了一个高速无刷直流电动机全数字锁相稳速系统，通过单片机与CPLD的合理配合，使系统以简单的电路实现了对电机转速的高精度控制。经实际测量，电机能快速起动并进入锁定状态，其反馈转速的转子位置传感器输出脉冲信号能稳定跟踪给定基准脉冲，转速稳定精度高；在额定转速下长时间工作时，系统有效抑制电机转速的漂移。试验表明，该系统实用性强，具有较高的工程应用价值。     

基于EKF的无位置传感器永磁同步陀螺电机控制方法的研究

无位置传感器永磁同步陀螺电机的起动及稳态运行性能取决于伺服控制系统的控制策略。以DSP芯片ADMC300为主控芯片,详细论述了将扩展卡尔曼滤波(EKF)应用于航天陀螺稳定平台中的无位置传感器两相永磁同步陀螺电机系统中的起动及稳态运行控制方法和相关软硬件设计。试验结果表明:相比较传统的利用反电势过零换相控制方法,利用EKF方法可以使电机起动更快,获得转子位置信号更多。     

软件锁相环技术在无刷直流陀螺电动机高精度稳速控制中的应用研究

研究软件锁相环技术(Software Phase-Locked Loop,SPLL)在陀螺用无位置传感 器 BLDCM 稳速控制系统中的应用,它是基于 DSP 通过软件算法来实现锁相功能。阐述了软件 锁相环的工作原理,数学模型以及 DSP 实现方法,分析了软件锁相环的 z 域模型,无刷直流电 动机稳速控制系统采用高速数字信号处理器 TMS320LF2407A 作为控制处理器,实现了系统的软 件锁相环算法。     

天线扫描用无刷直流微电机及其锁相稳速控制

介绍了一种用于导引头天线扫描永磁直流微型电动机及其锁相稳速控制系统,给出了永磁无刷直流电动机微型化设计方法,分析了永磁无刷直流电动机锁相稳速控制的基本原理,最后给出了研制电机的试验结果     

Energy-efficient induction motors performance characteristics andlife-cycle cost comparisons for centrifugal loads

When fixed-speed motors (fed directly at power frequency) are purchased for new installations or for replacements, the loaded shaft speed differences among motor options are either ignored or overestimated. The most common first-cut estimate is that the consumed shaft power will vary as the cube of the ratio of the motor rated nameplate speeds for centrifugal driven loads that have discharge control valves (on pressure or now control). In actuality, this is true only if the motors are loaded at approximately nameplate output. This paper discusses the true “control valve loss” factor taking into account actual speed differences among motor options. A simplified equation and figure are presented to permit quick evaluation of motor purchase alternatives for the lowest life-cycle cost based on efficiency and rated-load speed differences. NEMA standards on slip-speed variation should be made more stringent to increase the validity of speed-difference loss evaluations. Additionally, efficiency test results and loaded speed measurements for standard-efficiency and premium-efficiency 10 and 100 hp motors are presented, leading to a conclusion that standard-efficiency motors should be operated at no higher than rated voltage and that premium-efficiency motors should he operated at 5%-10% above rated voltage for best system efficiency     

Real-Time Analysis of the Transient Response Improvement of Fixed-Speed Wind Farms by Using a Reduced-Scale STATCOM Prototype

As the total number of installed wind farms is far from being negligible, an upgrading of their technology is essential to fulfil new interconnection requirements. Power electronics are considered to be a key technology to accomplish this task. In this paper the use of a STATCOM for the improvement of the ride-through capability of fixed-speed wind farms is analyzed. Critical aspects like STATCOM rating and control are analyzed. A modified STATCOM controller is proposed, based on the series combination of a power factor control loop and a voltage regulation loop, which permits an optimized behavior of the wind farm both in normal and fault conditions. The contribution of the STATCOM is analyzed by means of Hybrid real-time tests (with a reduced-scale physical prototype) and offline (full scale) simulations in PSCAD/EMTDC. The study highlights the great contribution of STATCOMs to the transient behavior of fixed-speed wind farms and the importance of an appropriate control strategy choice on the performance and rating of the device     

PERFORMANCE ANALYSIS OF A HIGH STARTING TORQUE SINGLE-PHASE INDUCTION MOTOR

ABSTRACT

The objective of the work described is to make an assessment of the possible use of three-phase induction motor working as a single-phase motor. The analysis is performed on the proposed winding arrangement, introduced previously by same authors. The analysis includes all motor windings, whereas the conventional analysis is performed on the running winding only. The motor windings are analyzed through the stationary direct and quadrature axes. The magnetic field and E.M.F's of the motor are studied at starting, run-up and running operation. Hence, d-q axis equivalent circuits are deduced to represent the motor at different modes of operation, taking into consideration the core losses and sturation effects. Prediction of the run-up and running characteristics of the motor under investigation is achieved by solving the equations of equivalnet circuits in a simple manner. The predicted results are compared with the releavant experimental results. Good agreement has been achieved, and this confirms the validity of proposed analysis.     

大规模压缩空气储能系统发电方式与运行控制分析与构想

压缩空气储能是一种充放电循环次数多、使用寿命长、可大规模储存电能的清洁环保的物理储能技术,适合于电网级大规模应用场合。文中分析了大规模压缩空气储能系统常规定速发电方式特点,提出了基于全控器件励磁的定速恒频同步储能机组控制策略,以获得更强的励磁能力和抑制系统振荡的能力,实现提升储能机组辅助服务能力。为了提高综合能效,提出了基于变速恒频双馈发电机组和变速变频直驱发电机组的大规模压缩空气储能变速发电方案构想,并分析了其典型运行控制策略,该变速发电方案具有提升储能机组控制功能及辅助服务能力的潜力。最后,分析了大规模压缩空气储能发电运行控制面临的挑战。     

基于直接转矩控制的风力机模拟器研究

介绍了风力机的数学模型,分析了风力机运行特性及最大跟踪原理,并在研究异步电动机的直接转矩控制的基础上通过Matlab/Simulink实现风力机模拟系统。该模拟装置是依据风速和转速的变化得出异步电机的电磁转矩指令从而来控制电机,并给出模拟风力机最大功率跟踪的仿真结果,验证该模拟系统的可行性和有效性。     

永磁同步电机低载波比优化复矢量控制

永磁同步电机运行在低载波比情况下d,q轴电流耦合问题严重,同时系统延时较大无法忽略。传统PI电流控制器受限于器件开关频率无法实现较好的控制效果,解耦器因为延时问题解耦效果很差,同时对电机参数敏感。针对上述问题,这篇文章在传统复矢量电流控制器的基础上进行改进优化,进行了复矢量电流控制器的延时补偿,有效避免了电机高转速下电流控制器的失稳;同时考虑了较复杂状态下的复矢量电流控制器如何实现以及增加鲁棒性的问题。Matlab仿真实验证明了优化复矢量控制的正确性和有效性。     

Optimized Energy‐Saving Speed Profile in Linear‐Motor Railway System

The most striking characteristic of linear‐motor railway system is that the structure consists of a primary and secondary linear induction motor (LIM). The primary side of the LIM is installed in a rolling stock, and the secondary side of LIM is installed on the track. The magnetic attractive vertical force produced by the LIM increases the running resistance since this force is in the same direction as the gravitational force due to which rolling stocks gain weight virtually from the track side of view. In addition, the efficiency of the LIM has different characteristics of efficiency compared with the rotary motor. Previous studies have focused on the design method of LIM to improve motor efficiency and decrease energy consumption. However, it is a well‐known fact that this kind of approach requires hardware renewal which requests large amount of investments. The purpose of this study is to analyze these characteristics of LIM effects and design the optimal speed profile to minimize the energy consumption as a linear‐motor railway system. This smart and economic energy‐saving approach is based on the optimization of speed profiles of the linear‐motor railway system using dynamic programming.     

基于凌阳单片机的变频控制系统的设计与实现

以SPCE061A和SPMC75F2413A单片机为核心,设计出一种应用于石油生产的可变频输油的自动化控制系统,它具有变频调速、万年历显示、定时启停油泵、整点启泵、自动盘泵和报警等功能.实践证明,该控制系统运行稳定可靠、智能化程度高.在硬、软件设计中,采用SPCE061A型单片机与SPMC75F2413A型单片机互联的硬件控制结构,单片机之间的数据通过RS485接口传输;使用C语言和汇编语言编程,提高了系统整体稳定性.     

SVPWM控制技术在两相异步电动机中的应用

研究了两相逆变器供电异步电动机系统的SVPWM控制技术,该系统可广泛应用于小功率、宽调速范围运行的场合。推导并建立了两相异步电动机的数学模型,分析了两相逆变器驱动两相异步电动机的工作原理和空间矢量的时间分配原则。以一台小功率两相异步电动机为对象,进行了系统仿真,给出该电机采用SVPWM方式控制运行时的仿真波形。