多相电机论文电动汽车用容错永磁同步电机的研究.doc

多相电机论文：电动汽车用容错永磁同步电机的研究 【中文摘要】随着电动汽车对可靠性和容错性能要求的不断提高,传统的三相电机难以满足这些要求,多相电机在能够满足电动汽车对可靠性苛刻要求的同时还有着高功率密度、低转矩波动的优势。本文研究的多相容错电机可以作为下一代电动汽车的高性能动力执行方案,而且还可以推广应用到舰船推进以及航空航天等领域。首先分析了容错电机的特点,明确电机的基本设计原则;综合考虑多种因素确定电机的相数,研究多相电机的基本原理,研究基于磁路法的多相电机电磁设计方法,通过建立有限元模型验证设计方法的正确性。其次研究了基于有限元计算结果的电感参数计算方法,考虑交叉磁化对电感参数的影响,给出计算流程,研究饱和时交叉磁化现象对电机电感参数的影响。接下来针对多相电机对转矩密度及转矩波动的特殊要求,选择合适的绕组排布方式,研究了极弧系数,充磁方向以及槽口宽度对电机性能的影响,由此确定电机的最优设计方案,并且对电机在全速度范围内的电磁性能进行分析。进一步分析电机在一相开路,两相开路以及一相短路下的转矩输出能力,使用相量法对故障下的转矩波动根源进行研究。最后研究了气隙磁动势中的谐波分布情况,对次谐波在永磁体中造成的涡流损耗进行了研究,并提出减小永磁体中涡流损耗的有效办法。 【英文摘要】To electric vehicles and other facilities who desire high reliability for the electric drive system, traditional three-phase machine could not meet the requirement. While multi-phase motor has the advantage of high power density and low torque ripple, also multi-phase motor could cover the rigorous requirement of electric vehicles for high reliability. This thesis is about multi-phase fault-tolerant motor , the motor can not only work as high performance electric drive system solutions for next generation of electric vehicles, but also can be popularized to ship propulsion, aerospace and other fields.First, characteristic of fault-tolerant motor was analyzed, and basic principle of fault-tolerant motor design was confirmed. Phase number was determined based on the balance of many factors, then basic electric and magnetic relations of the motor was deduced, considering all above conclusions the design method based magnetic circuit was proposed, then finite element method was used to verify correctness of the proposed method.Second, inductance parameter calculation method based on finite element analysis results was studied, the effect on inductance parameters due to cross magnetization was considered, and appreciate technical process about the inductance parameters calculation was proposed. Effect of inductance parameters due to cross magnetization was analyzed.Next, multi-phase motor has specific requirement of high power densi