【作者】 陈军；

【导师】 王群京；

【作者基本信息】 合肥工业大学 ， 电机电器及其控制， 2003， 硕士

【摘要】 混合励磁爪极发电机是由永磁体和励磁线圈共同产生电机磁场的一种发电机，与传统的爪极发电机相比有高效、低速性能好和集线圈励磁的电压调节性能与高磁通密度的优点，具有很好的研究前景和使用价值。但是，长期以来由于其结构和磁路的复杂、不规则性，又呈典型的三维磁场特性，因此，目前这方面的研究尚较为缺乏。 本文主要采用等效磁网络方法来研究该种电机。等效磁网络法的思想是来源于有限元法和等效磁路法的结合，传统的等效磁路法是把磁场转化为磁路计算，而有限元法是把电机内部根据磁场分布的不同，把求解区域划分成各个单元，因此，等效磁网络法是结合两者的优点而提出来的。其基本思想是通过磁通管原理，把电机内部磁通密度相对均匀的部分看作一个单元，计算出单元的磁导，最后再把各个节点用等效磁导连接起来构成一个磁导的网络图，再根据电路的基本解法求得各个节点的磁位，从而求得电机的参数和性能。等效磁网络法是把电机内部化分成许多单元，各个节点和单元的划分是固定的，与电机的转动无关，与电机转子位置相关的量是各个部分的磁导值，而各个部分的相对关系不变。因而在计算电机的动态性能时，不需要重新进行划分，只需要计算动态时的各部分的磁导即可。因此，此方法的剖分单元很少，节省了许多剖分时间，故计算时间比有限元法缩短了很多。等效磁网络法又考虑了电机内部的磁通分布的不同和漏磁通的影响，因此其计算精度远远高于传统的等效磁路法。具有有限元法和等效磁路法的优点，因此，此方法在计算特殊的电机磁场如三维磁场或者高度饱和的磁场能够发挥其自身的优势，满足电机工程设计的要求。 本论文对一台六对极混合励磁爪极发电机进行了分析、建模和计算，最后得出了电机的性能参数，并与采用三维有限元法分析计算的结果进行了比较。比较显示采用等效磁网络法能够在大大减小分析计算时间的同时，满足工程上计算精度的要求。更多还原

【Abstract】 The Hybrid claw-pole alternators have magnetic fields contributed by permanent magnet as well as excitation coil, and the advantages are high efficiency ,have good low-speed characteristics, excitation adjustable and high flux densities. For the reason of complex claw-pole construction and 3-D magnetic field distributions, there is lack of the research on the alternators.The Equivalent Magnet Circuit Network (EMCN) Method is based on combination between conventional MEC and FEM. The conventional Magnet Circuit Method transfer the field in electrical machine into magnet circuit to analyze and calculate the parameters and performance of electrical machine. The EMCN splits the magnet circuit into many elements according to the different flux distribution in the machine. The flux in each element can be considered to be even. The EMCN model is set up by use of flux-tube method. In this method, the segment in which the flux density is relatively even is considered to be an element, the permeance of each element can be calculated by use of conventional method. Finally the permeance network can be set up by connecting each node with permeances, then the parameters and performance can be obtained. EMCN can transfer the area in machine into several elements, each node and mesh are fixed and irrelevant to rotor rotation. Only the values of permeances are related to motor rotation, but all the relations of the permeances are fixed. So, only the permeance value should be calculated again when the dynamic performance is considered. There are few elements in EMCN, the mesh time can be reduced greatly and calculation time is more less than FEM time. EMCN considers the influence of the different flux distributions and leakage flux in alternator. The calculation accuracy is greater than conventional MEC. EMCN possess advantage of conventional MEC and FEM. So this method has many advantages in calculating special field such as 3D field and highly saturated field. The calculation results meet the requirements of engineering.This paper analyzes , models and calculates a six-pair poles hybrid claw-pole alternator. The calculation results are compared with the results of FEM. The comparison shows that this method meets the accuracy needs, and reduces the calculation time greatly.更多还原