1600kW转子侧变频调速装置在高温风机电动机上的应用

本文首先介绍了转子侧变频调速系统的原理,然后分析了1600kW转子变频调速装置的控制方案,最后详细的介绍了1600kW转子变频调速装置在高温风机电动机上的调试应用情况,节能调速效果良好。     

高压大功率电机调速方案的探讨和比较（续）

本文分两部分介绍了两种高压大功率电动机调速方案：转子端改变转差率的串级调速和定子端的高压多电平变频调速技术。第一部分介绍了串级调速的工作原理及发展过程以及它们的优缺点。这种方案特别适合那些对调速性能要求不高，调速范围不宽的风机，水泵类负载，但它的缺点是功率因数低，因此提出了内反馈斩波串级调速，特别是引入IGBT的PWM整流技术代替晶闸管逆变使这种方案的性能得到很大的提高，第二部分主要介绍了多电平的拓扑结构和控制策略，并给出了相应的仿真波形以及应该 注意的问题。这种方案适合那些要求性能比较高，调速范围宽和动态响应比较快的场合。最后对这两种方案做了分析和比较。     

交流电机转子电阻斩波调速方法研究

目前大多数工业用交流电机是采用接触器控制的绕线式异步电动机转子回路串分级电阻开环调速系统。这种调速方法存在着严重的缺点,主要有低速时机械特性较软,静差率较大,调速范围受到限制。本文介绍的转子电阻斩波调速是在转子回路串一个固定电阻与一个斩波器并联构成。通过对固定阻值进行斩波控制,实现对固定电阻的无级调节,从而实现电机转子的无级调节。该系统易于实现闭环控制、控制精度高、平稳性好、装置体积小,投资少,因而在对传统的起重机拖动系统进行改造时是一种较好的方案。     

电梯专用矢量控制变频调速器设计

简要介绍了一种电梯专用的、矢量控制变频调速器的原理和技术方案。该变频调速器采用转差频率型矢量控制，在电动机转子磁通的旋转坐标上，对电动机进行运算控制，使交流异步电动机具有直流电机的调速性能，即使在零速时，也能输出额定转距，此外，由于功率因素始终接近于１，比普通调压调速方式节能３０％以上。     

新型转子变频调速装置分析与设计

随着社会发展和节能意识的增强,变频器的市场需求逐渐增大,对变频调速技术的发展要求也越来越高。本文主要介绍了转子变频调速的优点,同时针对传统转子变频调速系统出现的逆变颠覆问题,提出了新型超大功率转子变频装置,即主要在传统串调加斩波的基础上,将逆变部分的晶闸管换成IGBT器件,整个调速装置就成了一个带斩波的IGBT电压型变频器。结果表明,设备可靠性大幅提升,调速精度高,调速范围宽。     

高压大功率电机转子侧斩波变频调速系统改进方案

本文简单介绍了转子变频调速的原理、调速系统装置的模块化设计以及改进后的调速装置的性能特点。将改进后的调速装置应用于风机和水泵的调速可以更好地节约能源,实现节能环保。     

感应电机能量最优化控制的研究

感应电机能量优化控制常根据电机静态模型采用恒转差频率控制。但该控制方案会导致调速系统的动态性能和稳定性降低。从感应电机的动态模型出发,提出了一种借助转子磁链控制实现感应电机能量优化的控制方案。根据外环给定电磁转矩的不同,调整内环转子磁链给定值,以达到能量优化控制的目的。在调速过程中,控制方案确保转子磁链紧跟给定值,使输出的电磁转矩紧跟给定值。因此,系统的稳定性、动态性能良好。     

高压大功率电动机调速方案的分析——多电平变频器和串级调速

本文介绍了两类高压大功率电动机调速方法：多电平变频器和串级调查，在定子端的多电平变频器方案中主要介绍了具有独立直流电源的级联型多电平主电路拓扑结构和分段SPWM控制策略，这种控制方法结合了工频开关模式和PWM调制策略两者的优点，既可以减小开关损耗，又可以使输出波形性能满足工业要求，而在转了端的串级调速方案里，介绍了串级调速的工作原理，其中重点阐述和分析了斩波控制的内反馈串级调速原理和拓扑结构，并给出了一种新型内馈串级调速系统拓扑结构，这种结构引入PWM整流方案，并且用IGBT模块代替原有系统的晶闸管逆变结构，使得串级调速系统的功率因数可以大大提高，并可以克服停电时，逆变颠覆的故障，最后给出了两种高压大功率调速方案的优缺点和相关结论。     

2.5MW转子侧变频调速节能系统的应用研究

为了解决风机、泵类的电机耗能过多的问题,提出了一种高压转子侧变频调速的节能方法．对高压转子侧变频调速系统的主回路拓扑结构进行了研究,报告了转子侧变频调速技术的国内外研究现状,阐述了通过改变绝缘栅极双极型晶体管（Insu Iated Gate Bjpo Iar Transistor．IGBT）占空比的方法,实现转子侧的变频调速,分析了主回路主要参数的计算公式．通过举例实际数据,验证了高压转子侧变频调速节能系统的良好性能,并且此系统有效地解决了能源浪费,转子侧变频调速造价昂贵、装置体积庞大等问题。     

高压交流变频调速技术在火力发电厂的应用

通过介绍变频调速的方法和节能原理，对高压变频调速同液力耦合器调速进行经济比较，分析了风机、水泵的节能情况，认为变频调速技术方案已经成熟，节电效果显著，一定会在各电厂得到广泛应用。     

Efficiency Optimized Speed-Control System Based on Improved Optimal Regulator Theory

Three new synthesis methods for an efficiency optimized speed-control system for a separately excited dc motor system are proposed on the basis of an improved optimal regulator theory. Controllable losses, such as copper losses, iron losses, power converter losses, etc., are approximately represented by a square of the armature current and the field current. In the first method, the losses are included in a particular quadratic performance index to be minimized. In the second method, optimal ratio of the armature current and the field current giving the minimum losses is analytically derived and the speed-control system attaining the optimal ratio is synthesized. In the third method, optimal ratio of the armature-impressed voltage and the field-impressed voltage giving the minimum losses is again analytically derived and the optimal speed-control system is synthesized. Maximum efficiency of the machine system is attained by adopting these methods.     

Speed control of ultrasonic motors using neural network

The ultrasonic motor (USM) is a newly developed motor, and it has excellent performance and many useful features, therefore, it has been expected to be of practical use. However, the driving principle of USM is different from that of other electromagnetic-type motors, and the mathematical model is complex to apply to motor control. Furthermore, the speed characteristics of the motor have heavy nonlinearity and vary with driving conditions. Hence, the precise speed control of USM is generally difficult. This paper proposes a new speed-control scheme for USM using a neural network. The proposed controller can approximate the nonlinear input-output mappings of the motor using a neural network and can compensate the characteristic variations by on-line learning using the error backpropagation algorithm. Then, the trained network finally makes an inverse model of the motor. The usefulness and validity of the proposed control scheme are examined in experiments     

Feed forward field orientation control of an induction motor usinga PWM voltage source inverter and standardized single-board computers

The implementation of a speed-control regulator for an induction motor with single-board computers and as much standardized hardware as possible is described. The improvements over previous attempts include mainly the use of gating pulse patterns previously stored in the memory of a computer board, the use of coprocessing, and of a technique combining both software and hardware to sample motor currents with the required accuracy. The experimental system proved stable and robust against variations of rotor resistance and responded well to step-input changes     

Speed control system design and experimentation for interior PMSM drives

This paper presents a robust speed-control strategy using a Takagi–Sugeno fuzzy model for interior permanent magnet synchronous motor (IPMSM) drives. The sufficient conditions of linear matrix inequalities, which can guarantee the existence of the fuzzy controller gains, are derived from a common quadratic Lyapunov function. Moreover, the maximum torque per ampere control is incorporated to improve the torque production in the constant torque region and the efficiency of the IPMSM drive. The global stability of an observer-based control system is analytically proven. Simulations and experiments are conducted to demonstrate the feasibility of the proposed approach through a prototype IPMSM drive system. Consequently, the proposed fuzzy control methodology can achieve less steady-state error and less sensitivity than the conventional feedback linearisation control method under motor parameter variations and external disturbances.     

基于ARM的全数字双闭环无刷直流电动机控制系统设计

针对直流电动机机械换相器和电刷等部件所固有的缺陷,介绍了一种基于ARM的电流、转速双闭环的无刷直流电动机控制系统设计方案,着重介绍了控制系统原理、系统整体构成、硬件各个模块及电机换相控制程序的设计方法。该设计方案能有效解决直流电机固有的机械换相器和电刷导致了电机容量有限、噪音大、容易产生火花和可靠性差等缺点。实验表明,该系统具有较好的控制可靠性、良好的动态性能及稳定性。     

Damping of Torsional Vibrations in High-Dynamic Industrial Drives

Theoretical, design, and experimental aspects of the control of the drive with an elastic coupling are considered in this paper. Control structures suitable for application in industrial high-dynamic drives are developed. In such drives, the first resonance frequency can be higher than a hundred hertz, and the next frequency can be a thousand hertz or higher. The solution is oriented to industrial plants, whose computation ability is lower and signal delay is greater than in laboratory plants based on DSP. The authors discuss the problem and show methods of suppressing torsion vibrations in speed-control systems with only one sensor, i.e., a motor position encoder. The presented solution is based on an adequately designed PID controller.      

新能源汽车驱动电机关键技术

本文详细介绍了新能源汽车的驱动电机总成及基本工作过程;对新能源汽车电机的类型及应用情况进行了总结,大量实例说明,永磁同步电动机广泛应用于新能源汽车上,同时具有高功率、高密度等特点;归纳了永磁电机的几项关键技术;概述了永磁电机的设计方案.     

江西铜业公司计算机网络的设计及实施

结合江西铜业公司的实践，介绍了计算机网络建设的设计原则、设计方案、设备选型和应用效果等，为大型企业计算机网络的建设提供了一个完整、成功的范例。     

三相交流调压电路在异步电机软起动中的应用

针对异步电动机全压起动时起动电流和起动转矩过大,易造成电机和负载损坏的缺点,将晶闸管三相交流调压电路引入电机软起动中。研究结果表明,其能显著改善起动电流和转矩过大的问题。文中阐述了晶闸管三相交流调压电路的工作原理;介绍了其在异步电动机软起动中的应用。此外,还研究了三相交流调压在电机软起动过程中,Matlab/Simulink的建模方法。给出了电机在软起动和全压起动的仿真结果,并对仿真结果进行了比较分析,相比全压起动,采用软起动可降低电机起动电流和起动转矩。