PM brushless DC motor drive with a new power-converter topology

With the growing potential for widespread use of permanent magnet brushless DC motor (PMBDC) drives in many low-cost applications, such as HVAC, refrigerators, and freezers in houses and small-velocity servos in process industries, it has become important to minimize the cost. One obvious place for cost reduction is in the cost of the inverter and its associated controller. With that perspective, a novel application of the converter topology for the PMBDC known as “C dump” in switched reluctance motor drives is proposed in this paper. The advantages and disadvantages of this topology vis-a-vis the conventional three-phase H-bridge converter, are highlighted from the points of view of economy in switches, volt-ampere rating, associated controller cost, and packaging. Design considerations for the PMBDC are derived for use with the proposed converter topology. The operational and design characteristics of this converter-driven PMBDC drive are derived for four-quadrant performance. Guidelines for the design of the proposed topology are derived, and presented in the paper. Experimental results from a laboratory prototype are presented to validate the feasibility of the proposed PMBDC drive system     

一种前端级联DC/DC变换器的开关磁阻电机驱动拓扑

针对开关磁阻电机传统不对称半桥功率变换器在电动汽车应用中的不足,提出了一种新型 DC/ DC 变换器级联在不对 称半桥功率变换器前端,以实现母线电压的调节以及制动能量的可控回馈。 首先,理论分析了变换器的工作模式;其次,分别建 立了励磁电压、退磁电压和关断角关于转速、负载的查找表,从而根据电机工况匹配合适的母线参考电压,并给出了系统整体的 闭环控制方案;最后,在一台三相 6 / 4 结构开关磁阻电机上进行了实验,实验结果验证了提出的新型功率变换器的有效性。     

A novel microcontroller-based sensorless brushless DC (BLDC) motor drive for automotive fuel pumps

This paper presents a novel back-electromotive-force (EMF) detection method for sensorless brushless DC (BLDC) motor drive systems. By this method, a true back-EMF signal can be directly extracted for each phase without sensing the neutral point of the motor. The method proposed is not sensitive to switching noise and requires no filtering. Good motor performance is achieved over a wide speed range as well. This novel sensing scheme is implemented into a hardware macro cell inside a mixed-signal microcontroller. The proposed microcontroller-based sensorless BLDC drive system has been successfully applied to automotive fuel-pump applications, which require high reliability and intelligence at a low cost.     

用于驱动无刷直流电机的矩阵变换器控制策略

利用矩阵变换器驱动无刷直流电机,可以实现无刷直流电机的交一交直接控制.针对无刷直流电机反电势为梯形波、相电流为方波的特点,提出一种用于驱动无刷直流电机的矩阵变换器的控制策略.将矩阵变换器等效为整流器和逆变器的虚拟连接,分别对这两个虚拟环节采用输入电流空间矢量调制和三相六拍120°持续导通模式,然后将两个环节的调制策略相结合,从而实现无刷直流电机交-交变频调速.该控制策略能够实现输出方波电流的同时实现输入电流的正弦化.对给出的控制策略进行了详细的理论分析与推导.实验验证了控制策略的正确性与可行性.     

双正激DC/DC变换器的一种新型拓扑研究

介绍一种新型的双端正激式DC/DC变换器电路拓扑,分析其所构成的开关电源主电路及控制、自启动等回路的结构原理,针对其适用于直流高电压输入和高变压器变比场合所必须解决的励磁磁势维持及续流等特殊问题,提出了一种独特的磁通维持续流控制方法.仿真及实验的结果证实了本方案的正确性与可行性.     

四开关三相方波无刷直流电机的磁链跟踪控制

在分析传统六开关三相无刷直流电机运行原理的基础上,提出四开关三相方波无刷直流电机的磁链跟踪控制策略.系统外环为转速环,通过转速环输出和电流形状函数分别相乘实现三相电流的给定,借助坐标变换在两相静止坐标系下构建电流闭环,采用磁链跟踪型调制策略实现对四开关逆变器的控制,从而克服了滞环调制的开关频率不固定问题,实现了四开关三...     

A novel technique for a DC brushless motor without position sensors

A dc brushless motor is a kind of synchronous motor driven by an inverter and requires sensors to detect the rotor position. As one of the methods, the induced voltages of a brushless motor have been utilized in practice. However, there are some problems in this method, e.g., the motor can obtain insufficient torque due to the low induced voltages in a low-speed range. This paper proposes a new method which controls the inverter angular frequency ω₁ by using inherent characteristics wherein the torque current i_r is almost proportional to the internal phase angle φ where the primary flux of a synchronous motor is controlled to be constant. If the parameters of a motor are given exactly, the speed regulation is quite small and the transient characteristics with high response and high starting torque are obtained. Furthermore, it is possible to operate a synchronous motor in the field-weakening range. Here, the principle of the control method and the performance characteristics of a dc brushless motor having no position sensors are discussed. The simulation and the experimental results of the tested machine show that the proposed method is very useful for practical applications.     

New design for the high-performance drive system for DC brushless motor

The dc brushless motor, permanent magnet-type synchronous motor (PM motor), has been used widely in industrial robots, the machine tools for factory, and factory automations. Therefore, it is more desirable to improve the performance of the PM motor variable speed control system. Although only the torque component current is adjusted as the control method for the PM motor, so-called Vector Control, it is expected that the developed characteristics will be added to the PM motor. In this paper, new driving methods for the PM motor and a new design method for the variable speed control system are presented. The new motor driving methods which bring to the PM motor a new driving performance, e.g., a quick transient response or high-efficiency motor driving, can be implemented by controlling not only the torque component current, but also the magnetizing component current. A developed optimal control theory, i.e., the error system technique, is employed for designing the control system. The control law is endowed with a steady robustness against the variation of the system parameters and the ability of compensating the delay time due to the control processing. The effectiveness of the proposed method is confirmed by simulations and experiments.     

永磁无刷直流电机驱动系统的动态模型

具体分析逆变器—永磁无刷电机系统的工作过程以及此系统的一种动态模型 ,在此模型中 ,只要给出任一时刻转子的位置信号和电机的一些参数 ,就可以推测下一时刻的相电流、转矩等波形     

无刷直流电动机直接驱动系统动态特性分析

在推导了转子表面安装永磁体无刷直流电动机的数学模型的基础上,介绍了一种以集成数字信号处理器ＡＤＭＣ３３１为核心全数字矢量控制无刷直流电动机直接驱动系统。着重分析了电流参考信号超前角,系统参数和驱动方式对无刷直流电动机系统动态性能的影响。     

新型无刷直流电机结构设计与性能分析

针对物联网通讯技术对微纳卫星提出的高性能、低成本的需求,提出了一种新型双圈磁钢无刷直流电机结构动量轮,介绍了其结构和工作原理。采用有限元法对气隙磁密进行仿真分析,结果表明,双圈构型电机气隙磁密和有效气隙磁密平均值均优于传统方案,气隙平顶宽度从传统方案的90°拓宽到120°,有效的提升了力矩输出性能。通过对无控制器状态下两种电机转速特性分析,验证双圈构型电机具有更优的动态和抗干扰性能;基于该结构设计了转速闭环PID控制系统并进行仿真分析,结果表明双圈构型电机在空载状态及突加负载两种情况下,电机达到稳定转速的时间和达到稳定转矩的时间均优于传统结构电机,且新型结构电机的脉动幅值降低约46.5%,可实现电机的高精度稳速控制。     

一种新型电动车用宽调速永磁电机驱动系统

介绍了一种新型电动车用永磁电机宽调速驱动系统。在采用新型电机结构的基础上．基于标量算法的快速电流追踪控制满足了高性能的调速要求。在高速下．利用变压器电势来削弱电机旋转电势。从而实现了高于基速的恒功率运行．扩展了电机的调速范围。     

A DC/DC converter topology for renewable energy systems

This paper presents a DC/DC converter topology for renewable energy systems. The proposed DC/DC converter can be used to obtain a well‐regulated output voltage from low‐voltage power source, such as wind turbine, photovoltaic array, fuel cell, etc. It has the merits of high efficiency, low device stresses, and low current ripple. The operating principle, theoretical analysis, and design criteria are provided in this paper. A laboratory prototype was successfully implemented. The simulation and experimental results are given to verify the feasibility of the proposed scheme. Copyright © 2008 John Wiley & Sons, Ltd.     

Remedial strategies for brushless DC drive failures

The possibility of developing failure diagnostics and remedial operating strategies, which together will make possible adaptive fault-tolerant operation, is investigated for a brushless DC motor drive with a fan load. Correlations between the predictions of a simulation program and test measurements are shown that provide confidence that the development of fault-tolerant drives can be undertaken with this tool. Methods by which a certain performance level can be reattained by a motor winding and an inverter transistor following some simple faults are examined     

无刷直流电机的新型控制器

自抗扰控制（ADRC）是在继承经典PID不依赖于对象模型优点的基础上,通过改进经典PID固有缺陷而形成的新型控制技术,性能优良。在分析永磁无刷直流电机特点及使用现状的基础上,建立了基于自抗扰控制器的无刷直流电机控制系统。仿真结果表明,自抗扰控制器对无刷直流电机模型的不确定性和外部扰动变化具有较强的适应性和鲁棒性,控制器算法简单,工程适用性较强,系统具有良好的动态响应性能。     

永磁无刷直流电机的转矩计算及

电磁转矩的准确计算对于电机及其控制系统的设计具有重要意义。本文以ANSYS软件为工具,分析了永磁无刷直流电机不同定转子结构对于转矩的影响,论述了消除转矩脉动和提高电机出力的策略。     

高性能直流调速系统中变流装置的比较分析

提出一种基于开关线性复合功率变换技术供电的直流调速系统 ,并将其与Buck电路供电系统作了比较 ,说明该系统具有良好的静动态指标和负载鲁棒性     

集中绕组永磁无刷电机的转矩研究

集中绕组永磁无刷电机由于绕组结构与常规60°相带分布绕组不同,定子磁动势的谐波含量增加,定子齿、槽的影响也加大。本文采用电机磁能虚位移原理计算电机转矩,并编制了计算软件,不仅可以计算电机的平均电磁转矩,还可以得到由谐波磁场产生的谐波脉动转矩。通过实例计算,本文还比较了整数槽绕组和分数槽绕组产生谐波转矩的情况,采用分数槽绕组可以削弱谐波脉动转矩。     

一种特殊直流无刷电机的驱动及调速系统

给出了一种特殊的无刷直流电动机的驱动及调速电路的解决方案 ,该电机主要用作定位系统的陀螺仪 ,由于对速度的稳定性要求较高 ,因此需要稳速电路 ,驱动电路主要用于快速起动。