磁场调制式永磁容错电机的分析、设计与控制

发布时间：2018-03-07 03:24

本文选题：永磁电机　切入点：磁场调制电机　出处：《江苏大学》2017年博士论文　论文类型：学位论文

【摘要】：直接驱动技术可消除齿轮箱等机械变速装置,将负载直接与电机连接,从而可实现高效率、高可靠性、免维护和运行安静的电机系统。因此,在传统工业和新能源领域受到越来越多的关注。永磁电机的转矩密度高、效率高,但一般容错性能较差,此外,其转矩密度也有待进一步的提升,以满足低速大转矩直驱电机系统高转矩密度、强容错性能的要求。本文基于磁齿轮的磁场调制基本原理和分数槽集中绕组,提出兼具有高转矩密度、强容错性能的磁场调制式永磁(Flux-Modulation Permanent-Magnet,FMPM)容错电机,形成了设计高转矩密度、强容错性能FMPM容错电机的一般性方法。本文的研究内容涉及分数槽集中绕组FMPM电机磁场调制作用机理及基本工作原理分析、FMPM电机绕组结构的设计选择、新型FMPM电机的设计分析、FMPM电机等效磁网络建模方法、容错控制等方面。本文的主要研究成果包含以下几个方面:1.基于磁动势磁导模型,剖析分数槽集中绕组FMPM电机的基本工作原理。揭示磁场调制作用的产生原因及利用磁场调制效应提升FMPM电机转矩密度机理。推导电机功率方程。确定影响磁场调制效果的关键结构参数,为优化设计电机的转矩密度提供理论依据和参考。2.分析对比分数槽集中绕组和集中绕组FMPM电机的工作原理、反电势、转矩、损耗和效率等各方面性能。提出最大输出功率的弱磁控制策略,拓宽FMPM电机的运行范围,揭示不同的绕组结构对FMPM电机性能的影响机理,为合理设计FMPM电机绕组结构,以满足不同的性能要求,提供参考。3.提出了适用于FMPM容错电机的新型混合定子结构,在保证电机转矩密度的前提下,降低电机永磁体极对数,减小铁耗、永磁体涡流损耗,从而有效提升效率。阐明了新型混合定子结构对磁场调制的作用效果。提出了基于混合定子结构的FMPM容错电机的一般性设计方法。4.提出了混合定子和辐向永磁体阵列结构FMPM容错电机,解决了传统FMPM容错电机转矩密度低和功率因数低的问题。在保证电机容错性能的基础上,显著提升FMPM容错电机的转矩密度和功率因数,此外,混合定子结构有效提升了电机高速运行时的效率。5.提出了对调制极部分进行基于剖分的等效磁网络建模方法,简化磁导计算模型,提高了等效磁网络模型计算精度。同时联合传统等效磁网络建模方式,建立整体电机的等效磁网络模型,在不失计算精确性的同时保证了等效磁网络计算的快速性,显著提升FMPM电机前期优化设计的效率。6.研究了正常运行和容错运行的控制策略,分析了电机正常运行和一相开路容错运行的多种空间电压矢量脉宽调制控制方式,加工制造了 2台FMPM容错实验样机,包括传统的和提出的FMPM容错电机,搭建了软硬件实验平台,测试比较了 2台电机的电磁性能,通过实验,验证了电机设计和控制策略的有效性。
[Abstract]:Direct drive technology can eliminate mechanical transmission device such as gearbox, connect the load directly with motor, so as to achieve high efficiency, high reliability, no maintenance and quiet operation of motor system. The permanent magnet motor has high torque density and high efficiency, but generally poor fault tolerance, in addition, its torque density needs to be further improved. In order to meet the requirements of high torque density and strong fault tolerance of low speed and large torque direct drive motor system, based on the basic principle of magnetic field modulation of magnetic gear and fractional slot concentrated winding, a high torque density is proposed in this paper. Flux-Modulation Permanent-Magnet-FMPM) fault-tolerant motor with strong fault-tolerant performance forms a high torque density. General method of FMPM Fault-Tolerant Motor with strong Fault-Tolerance performance. In this paper, the magnetic field modulation mechanism of fractional slot concentrated winding FMPM motor and its basic working principle are discussed and the design and selection of winding structure of FMPM motor are analyzed. The design and analysis of the new FMPM motor include the modeling method of equivalent magnetic network, fault-tolerant control and so on. The main research results of this paper include the following aspects: 1. Based on the magnetodynamic magnetic conductivity model, The basic working principle of fractional slot concentrated winding FMPM motor is analyzed. The cause of magnetic field modulation and the mechanism of increasing torque density of FMPM motor by using magnetic field modulation effect are revealed. The motor power equation is deduced and the influence on magnetic field modulation is determined. Key structural parameters of the effect, This paper provides the theoretical basis and reference for optimizing the torque density of the motor. The working principle, reverse EMF, torque of the fractional slot concentrated winding and the concentrated winding FMPM motor are analyzed and compared. In order to design the winding structure of FMPM motor reasonably, this paper puts forward the weak magnetic control strategy of maximum output power, widens the operation range of FMPM motor, and reveals the influence mechanism of different winding structure on the performance of FMPM motor. In order to meet different performance requirements, a new hybrid stator structure suitable for FMPM fault-tolerant motor is proposed, which can reduce the pole logarithm of permanent magnet, reduce iron loss and eddy current loss of permanent magnet under the premise of ensuring motor torque density. The effect of new hybrid stator structure on magnetic field modulation is clarified. A general design method of FMPM fault-tolerant motor based on mixed stator structure is proposed. 4. A hybrid stator and radial permanent magnet are proposed. Array structure FMPM fault-tolerant motor, The problems of low torque density and low power factor of traditional FMPM fault-tolerant motor are solved. The torque density and power factor of FMPM fault-tolerant motor are significantly improved on the basis of ensuring the fault tolerance performance of FMPM motor. The hybrid stator structure can effectively improve the efficiency of the motor at high speed. 5. An equivalent magnetic network modeling method based on subdivision is proposed to simplify the calculation model of magnetic conductance. The calculation accuracy of the equivalent magnetic network model is improved, and the equivalent magnetic network model of the whole motor is established by combining the traditional equivalent magnetic network modeling method. The calculation accuracy is not lost and the calculation speed of the equivalent magnetic network is guaranteed. The efficiency of optimization design of FMPM motor is improved significantly. 6. The control strategy of normal operation and fault-tolerant operation is studied, and several space voltage vector pulse width modulation (SVPWM) control methods for normal operation and one phase open circuit fault-tolerant operation of FMPM motor are analyzed. Two FMPM fault-tolerant experimental prototypes, including the traditional and proposed FMPM fault-tolerant motors, are manufactured. The hardware and software experimental platform is built, and the electromagnetic properties of the two motors are tested and compared. The effectiveness of motor design and control strategy is verified.
【学位授予单位】：江苏大学
【学位级别】：博士
【学位授予年份】：2017
【分类号】：TM351

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