磁钢充磁方式对内转子永磁电机的电磁性能影响分析

Analysis of the Effect on the Electromagnetic Properties of the Inner Rotor Permanent Magnet Synchronous Motor by Magnetic Steel Magnetizing Method

内转子表贴式永磁同步电机具有效率高、体积小、功率密度大等优点,其在工业机器人、数控机床等领域得到了广泛应用。在分析径向、平行充磁两种充磁方式的原理基础上,以24槽4极内转子表贴式永磁同步电机为例,利用有限元分析的方法,建立平行充磁和径向充磁两种充磁方式的分析模型,研究两种不同的充磁方式对电机齿槽转矩、气隙磁密等电磁性能的影响,给出了磁极数和永磁体尺寸对电机气隙磁场的影响。研究表明,对于极对数大于2的永磁同步电机,采用平行充磁的方式,电机的气隙磁密更大、齿槽转矩更小,电机的铁损耗更小,运行性能更优。

The inner rotor surface permanent magnet synchronous motor（ SPMSM） is widely used in industrial robots,machine tools and other fields for its many advantages such as high efficiency,small size,high power density,ect. In this paper,based on the analysis of radial and parallel magnetization magnetizing principles,taking the 24 slots 4 pole permanent magnet synchronous motor for example,and using the finite element analysis method,the two kinds of magnetizing models of parallel magnetization and radial magnetizing are established. The effects of two kinds of magnetizing on electromagnetic properties are researched,then the effects of the number of poles and the permanent magnet＇s size on gap magnetic field are given. The study shows that permanent magnet synchronous motor（ the number of pole pairs is greater than 2） have the greater flux density,smaller motor cogging torque,less iron losses and better operation performance with the method of parallel magnetization.