基于磁固耦合的永磁电机电磁振动分析

发布时间：2018-03-20 15:54

本文选题：永磁电机　切入点：电磁场分布　出处：《浙江大学》2014年硕士论文　论文类型：学位论文

【摘要】：本文对永磁电机振动的主要来源一一电磁振动进行了研究,分别对永磁电机的电磁场、振动特性和它们之间的耦合关系进行了分析。首先,本文推导了一个表贴式永磁电机在考虑转子偏心和齿槽效应情况下的电枢反应磁场的解析模型。这个解析子域模型将永磁电机的磁场区域划分为气隙子域(包含剩磁为零的永磁体区域)、定子槽子域以及定子槽开口子域。先建立表贴式永磁电机的各个子域中的基本方程,解出含待定系数的方程通解。然后列写各个子域的边界条件和子域间的分界面条件,通过添加边界条件确定通解中的待定系数。其中,为了考虑转子偏心,使用一阶摄动法对各边界条件进行了修正。其次,采用本文推导的表贴式永磁电机电枢反应磁场的解析计算模型,结合前人推导的表贴式永磁电机空载磁场的解析计算模型,分别对4极24槽和8极12槽这两种不同极槽配合的永磁电机在空载和负载情况下的电磁力波进行了分析,得到了电磁力波的时间谐波分量和空间谐波分量。最后,提出了永磁电机磁固耦合分析的两种分析方法。先介绍了磁固弱耦合分析方法：首先,使用Simulink软件来仿真电机的驱动电路,得到电机电磁场的激励,再使用JMAG软件计算电机的电磁场,将Simulink软件和JMAG软件结合起来,进行场路耦合仿真,计算了由控制电路激励的永磁电机的电磁场和电磁力,然后在JMAG中将电磁力加载到电机的三维结构模型上,进行永磁电机的振动分析。本文以一个8极48槽的内置式永磁电机为例对永磁电机的磁固弱耦合方法进行了说明。然后,介绍了磁固强耦合分析。这种方法可以考虑电机的电磁场与电机振动之间的相互作用,是一种双向耦合,可以得到更加准确的结果。在本文的方案中,电磁场采用上文提到的完整的表贴式永磁电机电磁场解析子域模型,通过MATLAB软件编程进行计算；永磁电机的振动计算,是将MATLAB计算得到的电磁力加载到ANSYS软件中建立的三维结构模型上,用有限元方法进行；通过ANSYS的APDL语言编程来实现电磁场模型和振动模型的调用计算以及MATLAB软件和ANSYS软件数据接口的建立,最终实现永磁电机的磁固强耦合振动分析。本文以4极48槽和8极12槽这两个永磁电机为例,对永磁电机的磁固强耦合分析方法进行了说明,耦合仿真得到的结果与理论结果是符合的。
[Abstract]:In this paper, the electromagnetic vibration, the main source of the permanent magnet motor vibration, is studied. The electromagnetic field, the vibration characteristics and the coupling relationship between the electromagnetic field and the vibration characteristic of the permanent magnet motor are analyzed respectively. First, In this paper, an analytical model of armature reaction magnetic field of permanent magnet motor with rotor eccentricity and tooth slot effect is derived. This analytical subdomain model divides the magnetic field of permanent magnet motor into air gap subdomain (including air gap subdomain). The permanent magnet region with zero remanence, the stator slot subdomain and the stator slot open subdomain. First, the basic equations of each subdomain of the surface permanent magnet motor are established. The general solution of the equation with undetermined coefficients is obtained. Then the boundary conditions of each subdomain and the interface conditions between the subdomains are listed. The undetermined coefficients in the general solution are determined by adding boundary conditions. In order to consider the rotor eccentricity, The first order perturbation method is used to modify the boundary conditions. Secondly, using the analytical calculation model of the armature reaction magnetic field of the surface permanent magnet motor derived in this paper, and combining with the analytical calculation model of the no-load magnetic field of the surface permanent magnet motor derived by the predecessors, The electromagnetic force wave of permanent magnet motor with 4 pole 24 slot and 8 pole 12 slot are analyzed under the condition of no load and load respectively. The time harmonic and space harmonic components of the electromagnetic force wave are obtained. Finally, two analysis methods for magnetic-solid coupling analysis of permanent magnet motor are proposed. The analysis method of magneto-solid weak coupling is introduced. Firstly, the driving circuit of motor is simulated with Simulink software, and the excitation of electromagnetic field of motor is obtained, then the electromagnetic field of motor is calculated by using JMAG software, and the Simulink software and JMAG software are combined together. The electromagnetic field and the electromagnetic force of the permanent magnet motor excited by the control circuit are calculated by the field-circuit coupling simulation. Then the electromagnetic force is loaded into the three-dimensional structure model of the motor in JMAG. In this paper, a built-in permanent magnet motor with 8 poles and 48 slots is taken as an example to explain the magnetic-solid weak coupling method of the permanent magnet motor. Then, the magnetic-solid coupling analysis is introduced. This method can consider the interaction between the electromagnetic field of the motor and the vibration of the motor. It is a two-way coupling and can obtain more accurate results. The electromagnetic field is calculated by using the complete electromagnetic field analysis subdomain model of the surface permanent magnet motor mentioned above, and the calculation of the vibration of the permanent magnet motor is carried out by MATLAB software. The electromagnetic force calculated by MATLAB is loaded into the three-dimensional structural model established by ANSYS software, and the finite element method is used. Through APDL language programming of ANSYS, the transfer calculation of electromagnetic field model and vibration model and the establishment of data interface between MATLAB software and ANSYS software are realized. Finally, the magnetic-solid coupling vibration analysis of permanent magnet motor is realized. Taking the four pole 48 slot and eight pole 12 slot permanent magnet motor as examples, the magnetic-solid intensity coupling analysis method of the permanent magnet motor is explained in this paper. The results obtained by coupling simulation are in agreement with the theoretical results.
【学位授予单位】：浙江大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM351

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