基于Halbach阵列新型永磁盘式无铁心电机的设计与研究

发布时间：2018-05-05 20:06

本文选题：盘式无铁心电机 + Halbach阵列　；参考：《哈尔滨理工大学》2015年硕士论文

【摘要】：盘式无铁心永磁同步电机因其轴向尺寸短、重量轻、结构紧凑、转动惯量小、机电常数小等优点，可以制成多气隙组合式结构，并被广泛应用于电动汽车、机器人、机械手臂、家用电器等要求薄型安装的场合。盘式无铁心永磁电机定转子排列位置有多种组合方式，本文对双外转子中间定子结构盘式电机的电磁场进行深入研究。首先本论文为了有效利用电机径向长度上的空间，，提出了基于Halbach阵列的楔形气隙结构，并设计了一台功率为250W的盘式无铁心同步电机，给出了电机转子磁极、计算极弧系数以及导体占空比的计算方法，并将盘式电机沿周向展开得到其二维结构模型，利用有限元方法计算了电机的二维磁场。其次针对盘式电机三维开域磁场的空气域问题进行分析，研究了空气域大小对电机周向气隙磁密的影响，并以合适的空气域尺寸建模，同时研究气隙磁密的径向分布情况。接着从Halbach阵列永磁体的充磁方向、永磁体厚度、永磁体宽度三个方面对电机转子进行了结构优化，并提出了不等厚和不等宽结构永磁体转子，通过对比分析这些结构的周向气隙磁密波形的正弦性、气隙磁密的谐波含量以及空载反电势畸变率来判断各结构的优劣。然后基于各结构永磁体转子的特点提出了梯形永磁体结构盘式电机，并在保证永磁体用量相当的条件下与其他结构进行对比研究，得出了梯形结构盘式永磁电机的优势。最后对梯形结构盘式永磁电机进行了电磁场分析，利用磁通法计算了其空载漏磁系数，分析该电机在额定负载下的电磁转矩特性。利用有限元法计算了空载和负载两种工况下的永磁体涡流损耗，并得出了影响涡流损耗大小的主要因素。同时计算了不同负载情况下的交直轴电感和轴向电磁力，并得出相关结论，为该类电机的进一步深入研究提供有益价值。
[Abstract]:Because of its advantages of short axial dimension, light weight, compact structure, small moment of inertia and small electromechanical constant, disc type iron-less permanent magnet synchronous motor can be widely used in electric vehicles, robots and mechanical arms. Home appliances and other occasions requiring thin installation. There are many kinds of combination of stator and rotor arrangement position of disc type core free permanent magnet motor. In this paper, the electromagnetic field of disk motor with double outer rotor middle stator structure is studied in depth. In this paper, in order to make effective use of the space on the radial length of the motor, a wedge air gap structure based on Halbach array is proposed, and a disk iron-less synchronous motor with 250W power is designed, and the rotor pole of the motor is given. The method of calculating the polar arc coefficient and the duty cycle of the conductor is presented. The two-dimensional structure model of the disc motor is developed along the circumferential direction. The finite element method is used to calculate the two-dimensional magnetic field of the motor. Secondly, the air field of disk motor is analyzed, and the influence of the size of air field on the circumferential air gap magnetic density of the motor is studied, and the appropriate size of the air field is modeled, and the radial distribution of the air gap magnetic density is studied at the same time. Then, the structure of the motor rotor is optimized from three aspects: the magnetization direction, the thickness and the width of the permanent magnet, and the structure of the permanent magnet rotor with unequal thickness and width is proposed. By comparing and analyzing the sinusoidal characteristics of the circumferential air-gap magnetic density waveforms, the harmonic content of the air-gap magnetic density and the no-load inverse EMF distortion rate, the merits and demerits of these structures are judged. Then the trapezoidal permanent magnet disk motor is put forward based on the characteristics of permanent magnet rotor. The advantages of trapezoidal disk permanent magnet motor are obtained by comparing it with other structures under the condition of ensuring the same amount of permanent magnet. Finally, the electromagnetic field of trapezoidal disk permanent magnet motor is analyzed, and its no-load flux leakage coefficient is calculated by flux method, and the electromagnetic torque characteristics of the motor under rated load are analyzed. The eddy current losses of permanent magnets under both no-load and load conditions are calculated by using the finite element method, and the main factors affecting the eddy current losses are obtained. At the same time, the axial inductance and the axial electromagnetic force under different loads are calculated, and the relevant conclusions are drawn, which provide useful value for the further study of this kind of motor.
【学位授予单位】：哈尔滨理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TM341

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