转子有辅助槽的表贴式永磁电机解析法建模与优化

通过在表贴式永磁电机的的转子上开辅助槽,可间接改善电机的齿槽转矩脉动状况.但目前相关文献大都基于有限元法,需要反复修改模型参数,且尚未得出明确的槽型优化方法.本文选取磁场中的标量磁位为求解变量,在电机的气隙区域、永磁体区域分别建立拉普拉斯和准泊松方程.对于不规则的永磁体形状,采用分块累加方法,提出了一种转子含有半圆形辅...     

A control strategy for stand-alone wound rotor induction machine

A control strategy to regulate the frequency and voltage of a stand-alone wound rotor induction machine is presented. This strategy allows the machine to work as a generator in stand-alone systems (without grid connection) with variable rotor speed. A stator flux-oriented control is proposed using the rotor voltages as actuation variables. Two cascade control loops are used to regulate the stator flux and the rotor currents. A closed loop observer is designed to estimate the machine flux which is necessary to implement these control loops. The proposed control strategy is validated through simulations with satisfactory results.     

Rotating vector methods for smooth torque control of a switchedreluctance motor drive

This paper has two primary contributions to switched reluctance motor (SRM) control: a systematic approach to smooth torque production and a high-performance technique for sensorless motion control. The systematic approach to smooth torque production is based on development of novel rotating spatial vectors methods that can be used to predict the torque produced in an arbitrary SRM. This analysis directly leads to explicit, insightful methods to provide smooth torque control of SRMs. The high-performance technique for sensorless motion control is based on a rotating vector method for high bandwidth, high resolution, position, and velocity estimation suitable for both precise torque and motion control. The sensorless control and smooth torque control methods are both verified experimentally     

Performance of a divided winding rotor machine with optimal controllers

A state-space model of a power system, where the long transmission line is represented by the constants A, B, C and D of its equivalent π-network (shunt compensating reactors are also taken into consideration), with a divided winding rotor (d-w-r) synchronous generator is obtained with an all-measurable state vector. The damping of the system with conventional excitation and prime mover controllers acting alone and with (a) optimal controllers and (b) optimal controllers with a prescribed degree of stability is assessed from the eigenvalue placement of the resultant closed-loop systems. Both controllers (a) and (b) referred to above, synthesized for full-load operating conditions, were tested under different load conditions to ascertain the feasibility of obtaining a fixed controller to cover a wide range of operating conditions.     

大型电机转子温度红外监控系统的研制

介绍一种用于大型电机转子温度红外实时监测控制系统。该系统是针对工矿企业大中型异步电机转子过热,引起断条这一普遍故障而研制的。本文讨论电机内部采集转子温度信号的特殊方法和转子测温原理,并对多机远程通信、实时监测及系统控制作了具体介绍。     

Vibration modes and acoustic noise in a four-phase switchedreluctance motor

Acoustic noise in the switched reluctance motor (SRM) is caused primarily by the deformation of the stator lamination stack. Acoustic noise is most severe when the periodic excitation of the SRM phases excites a natural vibration mode of the stack. The natural vibration modes and frequencies of a four-phase, 8/6 SRM are examined. Structural finite element analysis is used to compute the natural modes and frequencies. Impulse tests on the stator stack verify the calculations and show which modes are excited. Heuristic arguments are developed to predict the operating conditions that will excite the natural modes. Measurement of vibration while the machine is under load shows which operating conditions excite the natural modes and verifies the predictions. An approximate formula is derived to predict the frequency of the fundamental vibration mode in terms of lamination dimensions and material properties. The formula is validated by comparison with finite element calculations for several laminations, and hence is shown to be useful in design trade-off studies     

新型永磁外转子爪极电机的特性仿真

为了研究具有特殊结构的新型外转子爪极电机的运行特性,在对电机的结构、材料、特点以及运行机理进行分析的基础上,利用有限元分析软件,建立了对电机进行三维电磁场分析的仿真模型。采用场路耦合分析方法,通过ANSYS和CASPOC系统仿真软件的耦合计算,得到了在发电和电动两种状态下的系统仿真特性。仿真结果表明,该种电机具有功率密度和转矩密度大的特点,在发电和电动状态都表现出良好的运行特性。     

Modeling and construction optimization of a modular TFM with an outer rotor

This paper presents a new optimal design of the magnetic circuit for a modular reluctance transverse flux motor (TFM) with an outer rotor. The design aims at maximizing the average electromagnetic torque and minimizing the ripple torque, with the two requirements appropriately weighted depending on a specific application of the motor. A precise numerical FEM model of the motor, developed in the Flux3D program, is coupled with a MATLAB-based evolutionary algorithm for constrained optimization of construction parameters of the magnetic circuit. The fundamental role of a type of an optimization criterion function is emphasized and a new effective criterion function is introduced. The performance of an optimal motor prototype constructed according to the optimum design fully confirms the usefulness of the presented approach.     

ALA转子电机稳定性研究

针对ALA转子电机在变频器供电条件下出现的振荡现象，采用小扰动分析法对电机的稳定性进行了分析，得出了小扰动条件下分析电机稳定性的线性化方程，并由此确定电机振荡原因为特定的转子结构和非正弦供电电源．最后分析了电机参数与电机稳定性的一般关系，所得结果与实验现象相符．     

凸极转子无刷双馈电机的电感参数计算及转子设计

针对凸极无刷双馈电机两套定子绕组难于进行参数计算的问题,在传统的绕组函数法的基础上,应用分段函数来描述绕组函数以及反气隙函数,以此来计算有着两套绕组的无刷双馈电机定子功率和控制两套绕组的各自自感及互感,然后以此方法应用于转子形状的优化设计中,针对一系列极宽度不同的转子计算其自感和互感,并利用计算结果得到了最优的转子极宽度。通过与有限元数值计算方法所得到的计算结果进行对比,证明了提出方法的准确性,在计算转子极宽度最优值的应用中,体现了此方法的工程价值。     

组合转子同步电机稳定性探讨

组合转子同步电机由轴向叠片各向异性(ALA)磁阻段和面贴式永磁(SPM)段组合而成,磁路各自独立.为研究组合转子电机在开环V/f控制方式下的稳定性,采用小信号分析方法,探讨无惯性阻尼器和附加机械惯性阻尼器的组合式转子电机SPM段占转子全长之比k与电机稳定性的关系.研究结果表明,无惯性阻尼器的组合式转子电机,k值增大,稳定频率范围扩宽不明显;附加惯性阻尼器,选择合适的惯量盘惯量,调节阻尼器的粘性阻尼系数能明显扩宽稳定频率范围,且k和惯量盘惯量越大,阻尼器的粘性阻尼系数调节范围越宽,电机的稳定性越好.     

窗机用软起动器的应用与优化

本文简单介绍了空调用软起动器的工作原理、性能特点以及在空调中的实际应用情况,分析并讨论了软起动器设计中的注意点及应用中的注意事项,软起动器的使用极有效的降低了空调器起动电流,降低了对电网的冲击.     

整体转子结构永磁屏蔽电机的设计与优化

通过对双凸极永磁电机的分析,设计了一款用于管道屏蔽电泵的小功率整体转子结构永磁屏蔽电机。在此基础上,为了提高永磁屏蔽电机的效率,对该电机进行了优化设计。设计的电机为整体永磁转子,极弧系数为1,无转子铁心,且对定子结构进行了漏磁分析与设计。由于经验公式法无法精确计算涡流损耗,为此采用三维瞬态有限元方法分析计算了定转子屏蔽套的涡流损耗,并对该永磁屏蔽电机的性能进行了分析。然后采用拟牛顿法对该永磁屏蔽电机进行优化分析,使得在满足一定的约束条件下,效率达到最大值。最后制作了样机,样机实测结果验证了计算结果的正确性。     

Low-order parametric force model for a salient-pole synchronous machine with eccentric rotor

In this paper, a low-order parametric force model to represent the electromagnetic force on an eccentric rotor of a salient-pole synchronous machine was developed and verified. The force model with parameters estimated from the results of impulse method showed excellent performance. The proposed model allowed quick and accurate calculation of the electromagnetic force at the desired whirling frequency values and provided an opportunity to effectively combine the electromagnetic and mechanical analyses of electrical machines. Besides, results presented in this paper also verified the suitability of computationally efficient impulse method for the analysis of a synchronous machine.     

新型绕线式转子结构无刷双馈电机的磁场调制机理分析

介绍了一种转子绕组绕线式结构的无刷双馈电机磁场调制原理,分析了电机定子2P和2C极绕组及其在转子绕组中产生磁动势,推导出电机稳定运行条件。对特殊笼形、磁阻式转子结构磁场调制机理也作了介绍,对不同转子结构调制原理进行了对比。     

新型组合式转子同步电机参数研究

新型组合式转子同步电机的转子是在轴向叠片转子上嵌上一定长度的永磁体复合而成，其主要参数Ld、Lq的计算对于此种电机的分析具有重要的意义。本文对此电机的结构、参数进行了探讨，并通过两种方法得出了电机主要参数的计算公式，分析结果亦由实验予以验证。     

定子永磁型双凸极电机的转子设计

目前,对双凸极永磁（Doubly salient permanent magnet,DSPM）电机驱动系统研究时间相对较短,尚有不少技术问题有待进一步深入探讨.但鉴于已了解双凸极永磁电机驱动系统具有的优点、特征以及合理使用该系统,结合实践,对定子永磁型双凸极电机的转子进行了设计,分析了双凸极永磁电机的电流斩波控制和角位置控制方式,阐述了功率变换器的电路结构和信号检测原理.     

基于二阶滑模观测器的感应电机转子磁链观测

实现矢量控制的基础是准确获得转速和转子磁链信息,本文提出了一种基于二阶滑模观测器的转子磁链观测方法。将构造的滑模观测器作为模型参考自适应系统(MRAS)的参考模型,将磁链的电流模型改造为该中间变量的可调模型,且其可调量为转速变量,进而构造出MRAS,实现对转速的观测。在此基础上,完成转子磁链的计算,并得到转子磁链角度,实现基于直接磁场定向的感应电机矢量控制。中间量的构造有效避免了传统MRAS中的纯积分问题,便于算法的实施;二阶滑模观测器有效地削弱了一阶滑模观测器存在的抖振扰动,并且参数具有较强的鲁棒性。仿真结果表明该转子磁链观测器具有较高的观测精度,且对外部扰动和转子电阻变化具有较强的鲁棒性,提高了系统的动稳态性能。