基站用外转子永磁同步发电机的设计研究

发布时间：2018-03-20 18:08

本文选题：外转子　切入点：永磁同步发电机　出处：《沈阳工业大学》2017年硕士论文　论文类型：学位论文

【摘要】：随着我国通信行业的发展,通信基站数量和用电设备的增加使基站应急供电发电机得到广泛应用。由于基站空间的限制,要求发电机具有体积小、效率高、便于维护等特点。在此背景下,外转子分数槽集中绕组永磁同步发电机逐渐被应用在通信基站中。外转子分数槽集中绕组永磁同步发电机具有功率密度大、高效、质量轻、易维护、便携等特点。但分数槽集中绕组产生的磁动势谐波含量相对整数槽较高,永磁体涡流损耗不可忽略;通信设备对发电机的固有电压调整率要求较高。因此本文针对外转子分数槽集中绕组永磁发电机永磁体涡流损耗和固有电压调整率两个问题进行研究。针对永磁体涡流损耗的研究:首先从气隙磁导变化、定子磁动势空间谐波、定子电流时间谐波分析了永磁体涡流损耗的产生原因,其次研究了永磁体涡流损耗的有限元计算方法,最后从极槽配合、气隙长度、极弧系数、槽口尺寸四个方面分析了其对永磁体涡流损耗的影响。针对发电机固有电压调整率的研究:采用交直轴等效磁路法计算电抗参数,从提高发电机凸极率的角度研究气隙、永磁体磁化方向长度对发电机固有电压调整率的影响。设计了一种永磁体极间加入导磁材料的转子结构,这种结构可以明显提高凸极率。设计一台功率为6.5kW的外转子永磁同步发电机,从永磁体涡流损耗、有效材料用量、齿槽转矩三方面分析三种极槽配合的利弊并选择一种极槽配合,结合转子极间加导磁材料的转子结构降低固有电压调整率。用外电路模拟发电机负载情况下的电压输出,验证了设计的合理性。
[Abstract]:With the development of communication industry in China, the number of communication base stations and the increase of electrical equipment make the base station emergency power generators widely used. Because of the space limitation of base stations, the generators are required to have small size and high efficiency. In this context, the external rotor fractional slot concentrated winding permanent magnet synchronous generator is gradually used in the communication base station. The external rotor fractional slot concentrated winding permanent magnet synchronous generator has the advantages of high power density, high efficiency and light mass. It is easy to maintain, portable and so on, but the harmonic content of magnetic EMF generated by concentrated winding of fractional slot is higher than that of integer slot, so the eddy current loss of permanent magnet can not be ignored. In this paper, the eddy current loss and inherent voltage adjustment rate of permanent magnet generator with fractional-slot concentrated winding outside rotor are studied. The study of body Eddy current loss: firstly, from the change of air gap magnetic conductance, The causes of eddy current loss of permanent magnet are analyzed by stator magnetodynamic potential spatial harmonics and stator current time harmonics. Secondly, the finite element calculation method of permanent magnet eddy current loss is studied. Finally, from pole slot fit, air gap length, polar arc coefficient, The influence of slot size on eddy current loss of permanent magnet is analyzed. In view of the inherent voltage adjustment rate of generator, the reactance parameters are calculated by using the method of alternating straight axis equivalent magnetic circuit, and the air gap is studied from the angle of increasing the salient pole rate of generator. The effect of the length of magnetization direction of permanent magnet on the inherent voltage adjustment rate of generator is studied. A rotor structure with magnetic conduction material between permanent magnets is designed. This structure can obviously improve the salient rate. An external rotor permanent magnet synchronous generator with a power of 6.5 kW is designed, with eddy current loss from permanent magnet and effective material consumption. The advantages and disadvantages of three kinds of pole-slot fit are analyzed in three aspects, and a polar slot fit is selected. The rotor structure with magnetic conduction material between rotor poles reduces the inherent voltage adjustment rate. The output voltage of generator under load is simulated by external circuit. The rationality of the design is verified.
【学位授予单位】：沈阳工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM313;TN929.5

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