双绕组开关磁阻电动机逆变器设计

本文回顾分析了近年来国外学者对SR电动机逆变器的性能计算和设计,从能量流动角度提出估算逆变器开关元件电流额定值的原理,以2.2kW四项双绕组(8/6)SR电机为例阐述了双绕组SR电机逆变器的设计方法。文中还给出了该逆变器运行的测试结果。     

DESIGN AND PERFORMANCE OF A MICROCONTROLLER-BASED SWITCHED RELUCTANCE MOTOR DRIVE SYSTEM

ABSTRACT

There is a growing interest in the use of switched reluctance motor (hereafter referred to as SRM) drive systems for various applications in diverse areas such as defense, home appliances, etc. Hence the design of a low cost controller for the SRM drive with high performance capabilities gains added significance. Microcontrollers (single chip computers) have emerged to fill this need in motion control. They provide both software control and flexibility in the reconfiguration of control algorithms. They also minimize the number of chips thus enhancing the system reliability at a low cost. This paper introduces a microcontroller-based controller for SRM drives with only an EPROM and two ICs for the logic access constituting the peripheral circuits. The entire control scheme including the pulse width modulator is implemented by software. A Siemens 80535 microcontroller chip has been chosen for this study.     

TANGENTIAL FORCE DISTRIBUTION AND FORCE PULSATION IN A LINEAR RELUCTANCE MOTOR

ABSTRACT

A study of normal flux density, tangential force distribution and force pulsation is made on a segmented secondary linear reluctance motor. Appropriate analysis is included in a form convenient for numerical study. Results are obtained numerically for two different linear reluctance motor geometries corresponding to laboratory models. Some experimental results are compared with numerical results. The numerical results show that the normal flux density and the tangential force distribution vary with linear displacement but in a less severe manner than the same variables in a linear induction motor. The tangential force pulsation is significantly large and the normal force pulsation is less severe.     

次级分段直线磁阻电动机的分析

利用凸极同步电机的理论,对次级分段直线磁阻电机进行了分析,推导出直轴和交轴区反应电抗、功率因数以及驱动力等一般表达式。证明了次级中心开浅槽的直线磁阻电机在功率因数、驱动力等方面比一般的直线磁电机都有一定的提高。讨论了该电机应用于中低速磁悬浮列车的可能性。     

同步磁阻电动机研究

该文根据能量平衡观点，以异步发电机为参照，较全面地分析了Xd,Xq和凸极比K对磁阻电动机性能的影响，讨论了凸极比适合值的选择问题，并指出对cosψ小于0．85以下的小容量电机，同步磁阻电动机在应用中可与异步电动机匹敌。     

基于两步换相控制策略的SR电机直接数字控制系统设计

采用只有6只主开关器件的四相功率变换器，在以8098单片机为控制核心的750W SR电机直接数字控制系统设计中，引入两步相控制策略，在电压PWM和APC两种工况下，显著地抑制了SR电机的振动和噪声。     

转子内具有钇钡铜氧块材的超导磁阻电动机的研究

随着高温超导技术在电能领域的逐渐应用，超导磁阻电动机作为一种新型电机引起了广泛关注。该文首先介绍试制的一台小功率超导磁阻电动机样机的基本结构，然后以该样机为例，讨论此类电机的磁场、参数及性能的分析计算方法，同时对该样机与常规磁阻电动机作了比较，结果表明超导磁阻电动机具有更高的效率和功率因数，并具有较好的同步性能。     

功率MOSFET变换器在开关磁阻电动机驱动系统中的应用

本文介绍了一种新型调速系统－开关磁阻电动机驱动系统，分析了驱动系统的特点及其对功率变换器的要求，并论述了在中小功率场合应用功率ＭＯＳＦＥＴ作为功率变换器的意义，同时对该系统的功率变换器器件设计、功率ＭＯＳＦＥＴ的栅极驱动与保护作了研究。     

一种新型的无轴承开关磁阻电机数学模型

针对经典采用直线磁路和椭圆形磁路分割求取气隙磁导的无轴承开关磁阻电机数学模型的局限性，文中提出了一种基于直线磁路和改进的椭圆形磁路分割求取气隙磁导的新型无轴承开关磁阻电机数学模型，该数学模型不仅保证定、转级对中位置时电磁转矩的连续性，而且同时较为准确地描述了沿α和β方向径向悬浮力之间的耦合关系。不仅如此，基于该数学模型在一定程度上拓宽无轴承开关磁阻电机的有效工作区域，仿真分析验证了该数学模型的优良特性。     

一种新型开关磁阻电机软开关功率变换器的研究

为了实现开关磁阻电机（SRM）绕组电流或磁链的精确控制,必须提高SRM功率变换器的工作频率以提高系统的动态响应速度.然而,较高的工作频率会引起严重的电磁干扰（EMI）和开关损耗从而导致系统整体效率降低,文中结合谐振开关（RS）、直流谐振环（RDCL）和脉冲宽度调制（PWM）的优点,提出了一种新型的软开关SRM功率变换器,基工作原理为通过在非对称桥式电路的基础上增加一套换流电路,以此实现功率器件的软开关.在对变换器工作原理详细分析的基础上,导出了实现软开关的条件并给出了设计实例.仿真和实验研究证实了新型软开关SRM变换器的可行性.     

THYRISTOR CONTROLLED PULSATING FIELD RELUCTANCE MOTOR SYSTEM

ABSTRACT

Integral horsepower pulsating field reluctance motors are treated when operating in dc-supplied, fixed voltage, thyristor controlled variable speed systems. A thyristor controller with two operating modes is described. Exciting MMF differential equations are put into normalized forms, simplifying their solutions, which are given. Three parameters Q, p and x_rs concisely character= rize motor, MMF differential equations and torque. For typical speed/torque curves thyristor control angles are determined. Optimum pole- and gap dimensions are investigated on the basis of published permeance charts.     

MAGNETIC CIRCUIT STUDIES FOR AN AXIAL-GAP RELUCTANCE MOTOR

ABSTRACT

The analysis of the magnetic circuit of an axial air-gap, battery-excited reluctance motor is presented. Permeance coefficients from which machine inductance can be calculated are derived. Inductance values calculated from these permeance coefficients are compared with values determined by magnetic analogs and by studies of air gap magnetic potential distribution using relaxation techniques and the Finite Element technique.     

开关磁阻电动机电流双幅值斩波控制

开关磁阻电动机转矩波动是以其开关形式供电电源所产生的不可避免的现象。为使转矩波动最小化 ,提出了电流限波动双幅值斩波控制方法 ,设计了实现该控制方式的电路 ,仿真计算了单幅值和双幅值斩波控制方式下电机的合成转矩波形 ,证实了该方法在低速时对降低转矩波动的有效性。实验结果表明 ,该方法能有效地降低低速噪声     

SEGMENTED SECONDARY LINEAR RELUCTANCE MOTOR: ANALYTICAL AND EXPERIMENTAL RESULTS

ABSTRACT

The segmented secondary linear reluctance motor is analyzed using a permeance function approach. The basic assumptions are iron linearity and current excitation. The resulting analytical equations are implemented for numerical computation. The numerical results are compared with experimental results which are obtained from a 2 pole, 37 m/s laboratory model linear reluctance motor.     

博物馆设计的新纪元——天然光的复兴

知名的艺术藏品和博物馆能吸引游客并增加城市的税收。有几个最好的例子：巴黎的卢浮宫、阿姆斯特丹的国立美术馆、伦敦的大英博物馆、马德里的普拉多博物馆、纽约的古根海姆博物馆、佛罗伦萨的乌菲兹美术馆、开罗的国家博物馆等等。为此，许多城市大力投资扩建甚至新建博物馆。     

无位置传感器开关磁阻电动机位置的检测与预报

讨论了开关磁阻电动机通过在非通电相加激励脉冲判断转子位置,从而取消转子位置传感器的理论依据,建立了最高激励脉冲频率的数学模型,分析了此方式下激励脉冲频率对系统控制精度的影响,提出了利用曲线拟合算法来预报转子位置,从而更准确地控制各相绕组开通与关断的新方法。详细的仿真分析证实了该方法的可行性,并在１台１２／４极三相开关磁阻电动机（ＳＲＭ）上进行了试验,效果较好,进一步验证了该方法的有效性。     

复合实心转子磁阻电动机起动性能分析

运用状态变量法,建立磁阻电动机暂态性能的数学模型,导出了磁阻电动机状态方程的直接表达式,并采用定步长四阶龙格-库塔法对复合实心转子磁阻电动机的起动性能进行数字仿真计算,所得结果与试验值较为一致。与凸极实心转子磁阻电动机相比,复合实心转子磁阻电动机转矩、转速脉动小,暂态过程短。     

单相磁滞—磁阻电动机的稳态特性

磁滞-磁阻电动机可有效地同时利用磁滞效应和磁阻效应产生的电磁转矩,因此其性能优于普通的磁滞电动机。本文举实例对比磁滞-磁阻电动机和普通磁滞电动机的额定运行性能和失步点的性能,理论计算结果与试验值比较接近。     

开关型磁阻电动机转子位置检测技术

本文结合作者研制实践，阐述了用交敏传感器检测ＳＲ电机转子位置的原理和实现方法，讨论了检测精度问题，并给出了具体电路。     

TESTS OF AN AXIAL AIR-GAP VARIABLE RELUCTANCE MOTOR SUPPLIED BY A SOLID-STATE CONVERTER

ABSTRACT

An axial air-gap variable reluctance motor with a mobile disc between two stationary discs is tested in the 0 to 400 Hz frequency range. The machine is combined in succession with two converters of original design. The results are presented in the flux/ampere-turns plane, with physically illustrates the intrinsic possibilities of this type of motor. Experiments is conducted with two air-gap values (1 mm and 0.6 mm), this helping to estimate accurately the performance gains achieved by reducing the air-gap. Emphasis is placed on the need to saturate the iron in the discs completely.