轴向磁场反凸极永磁同步轮毂电机研究

发布时间：2018-03-25 01:27

本文选题：永磁同步电机　切入点：轴向磁场　出处：《哈尔滨工业大学》2015年硕士论文

【摘要】：轴向磁场永磁同步电机轴向尺寸短、转矩密度高,易于实现多盘模块化及轻量化,一直备受对簧下质量和轴向空间有极高要求的混合电驱动轮式车辆研究领域的关注。但该类电机因其表贴式永磁体结构,使其弱磁扩速能力受到制约,影响了其在轮毂系统中的进一步应用。本文对轴向磁场反凸极永磁同步电机(NSAFPMSM)开展研究,通过分析转子侧软磁材料和永磁材料的构成比例和组合方式,研究凸极比的变化规律,给出了不同转子磁极结构对电机弱磁扩速能力的影响,以期解决传统轴向磁场永磁同步电机弱磁扩速能力弱的问题。主要研究内容包括以下几个方面:首先,针对不同NSAFPMSM磁极结构分析其磁路特点,并仿真研究不同磁极结构对电机磁场分布的影响。从理论上对比不同凸极性电机运行特性之间的差异,分析其在控制上的异同。结合电机特点总结轴向磁场反凸极永磁同步轮毂电机的设计原则,并给出改变磁极结构电机电压方程和转矩方程所发生的变化。其次,基于磁路法对分数槽集中绕组NSAFPMSM的电感进行理论推导,给出不同磁极结构电机交、直轴电感的计算公式,分析磁路不饱和与磁路饱和时电感表达式之间的差异,并利用有限元仿真进行验证。仿真对比分数槽集中绕组和整数槽分布绕组对电机电感的影响情况。再次,理论研究永磁同步电机电感、磁链等变化对电机功率输出特性的影响,并从功率输出特性角度指出不同凸极性电机的适用条件。借助有限元方法对比研究串、并联转子磁极结构对NSAFPMSM弱磁扩速范围和输出功率的影响,以及不同径向并联组合磁极对电机的影响情况。最后,分析影响反凸极永磁同步电机最大转矩/电流运行内功率因数角的因素,并在此基础上对电磁转矩的成分进行分析。对影响该类电机转矩波动的齿槽转矩和纹波转矩分别进行分析与抑制,提出新磁极结构以达到更好的转矩波动抑制效果。
[Abstract]:Axial magnetic field permanent magnet synchronous motor has short axial dimension, high torque density and easy to realize multi-disk modularization and lightweight. The research field of hybrid electric drive wheeled vehicles with extremely high requirements for underspring mass and axial space has been paid much attention to. However, due to its permanent magnet structure, the speed expansion ability of this kind of motor is restricted by its weak magnetic field. In this paper, the axial magnetic field inverse salient pole permanent magnet synchronous motor (NSAFPMSM) is studied. By analyzing the composition and combination of soft magnetic material and permanent magnet material in rotor side, the variation law of salient pole ratio is studied. The influence of different rotor pole structures on the weak magnetic expansion ability of the motor is given in order to solve the problem of the weak magnetic field expansion ability of the traditional axial magnetic field permanent magnet synchronous motor. The main research contents include the following aspects: first of all, The magnetic circuit characteristics of different NSAFPMSM magnetic pole structures are analyzed, and the effects of different magnetic pole structures on the magnetic field distribution of the motor are simulated, and the differences between the operating characteristics of different salient polarity motors are compared theoretically. The design principle of the axial magnetic field reverse salient permanent magnet synchronous hub motor is summarized, and the changes of voltage equation and torque equation of the motor with changing magnetic pole structure are given. Based on the magnetic circuit method, the inductance of fractional slot concentrated winding NSAFPMSM is derived theoretically, and the calculation formulas of alternating and straight axis inductance of motor with different magnetic pole structures are given, and the difference of inductance expression between magnetic circuit unsaturated and magnetic circuit saturation is analyzed. The effects of fractional slot concentrated winding and integer slot distributed winding on motor inductance are compared by finite element simulation. Thirdly, the influence of permanent magnet synchronous motor inductance and flux chain on motor power output characteristics is studied theoretically. The application conditions of different salient polarity motors are pointed out from the point of view of power output characteristics. By means of finite element method, the effects of magnetic pole structure of series and parallel rotor on NSAFPMSM weak magnetic expansion range and output power are studied. And the influence of different radial parallel combined poles on the motor. Finally, the factors affecting the maximum torque / current running power factor angle of the inverse salient permanent magnet synchronous motor are analyzed. On this basis, the composition of electromagnetic torque is analyzed. The slotting torque and ripple torque which affect the torque ripple of this kind of motor are analyzed and suppressed respectively, and a new magnetic pole structure is proposed to achieve better torque ripple suppression effect.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TM341

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