【作者】 曹建伟；

【导师】 陈益广；

【作者基本信息】 天津大学 ， 电机与电器， 2007， 硕士

【摘要】 低速永磁同步电机是一种新型结构电机,极数多、低速运行、输出转矩较大是其显著特点。在结构上采用新颖的极槽匹配方法,可以减少定子槽数,提高电机的单位体积出力。随着科学技术的迅猛发展,在某些系统中,例如:电动执行机构,机床进给系统及电梯拖曳装置中,希望电动机输出较低转速。而传统交流电机都是以高速旋转的,它们有90%必须与庞大的减速机构相配套才能使用。电机采用齿轮传动后,不仅使系统尺寸、重量增加,而且产生噪声,增加惯量,降低效率及使用寿命,同时由于齿轮啮合精度的限制,在要求正反转和平稳快速反应时,齿轮传动往往影响系统性能。本文所述电机采用Modular集中绕组绕线方式,各相集中绕组分别连续绕制,从而相互之间没有叠压。这样不仅方便绕制,而且绕组的端部较短,可以显著的减少用铜量和铜耗,效率较高;电机轴向长度短;由于用铜量减少,可以节约制造成本。这样的绕线方式还可以非常容易制做成较多极数,由于极数较多、转速较低,电机的输出转矩也较大,而使电机在没有减速机构的情况下就可以运行在低速大转矩状态。有限元方法是一种数值方法,它的核心思想是把具有连续介质的结构或场离散为有限个节点连接起来的单元来分析。它是根据变分原理和离散化求解近似解的方法,把条件变分问题变换为对象来处理电机内部电磁场问题的。本文利用有限元软件对低速永磁同步电机电磁场进行了分析和计算。本文从研究这种电机的基本结构和基本理论入手,探讨了电机的稳态性能,分析了影响电机性能的几个重要电磁参数。讨论了气隙长度、永磁体极弧长度、永磁体厚度、定子齿宽和槽口宽度等结构的变化对电机气隙磁场和空载反电动势等电磁参数的影响,总结出了不同电机结构参数下磁场分布的关系。更多还原

【Abstract】 High torque performance permanent magnetic synchronous motor is a new typical electrical machine. Multipoles, low speed and high torque is its distinct characters. The technique of pole-slot match is applied to the motor, it can decrease the number of stator’s slot, and reduce motor’s volume, and raise motor’s power every volume.Along with the rapid scientific and technological development, and in some systems, such as: electric, machine of feed system and lift devices, the lower output of the electric motor speed is hoped. Moreover, the traditional AC motor is rotating at a high speed, and they have 90% of the slowdown with the huge body matching can be used. Gear motor, it will not increase the system size and weight, but also make noise and inertia increase, furthermore reduce efficiency and service life. Because of the precision gear meshing restrictions and the requirement in positive and steady and rapid response, gear rotational often affect system performance.The motor equips with Modular fractional slot windings. The concentrated winding of each phase is separately wound on consecutive teeth so that the phase windings don’t have overlap. This is not only a convenience of manufacture, but also the end of winding is shorter. The amount of copper and copper loss is reduced, so efficiency is high. It adopts this stator structure so that it can be made into relatively more pole number.Finite elment method is a numerical method, which is used to analyse structure or field. Its main idea that structure or field, which is made of consective dielectric, is discreted into elements that connected by limited nodal points to analyse. The method, which based on the theory of variation and the measure of discretizational resolver, invert conditional variation into object to resolve inner electromagnetic of the machine. The inner electromagnetic of high torque permanent brushless motor is resolved in this paper.From this study the basic structure of the electrical and basic theory, this paper discusses the steady-state performance of the motor, and analyzes the electromagnetic parameters impacting performance of motor. Through the air gap length, pole-arc coefficient, rotor magnets thickness, width of stator teeth and slot, the paper analyzes the impact of electromagnetic and Back Electromotive Force of the motor, summed up a different structure of the electrical parameters of the magnetic field distribution.更多还原