永磁磁阻电机不同结构下的电磁性能对比分析

Comparative Analysis of Electromagnetic Performance of Permanent Magnet Reluctance Motors Under Different Structures

传统内转子永磁电机功率密度大、效率高、应用广泛,但存在着调速范围和过载能力相对有限、电机散热较差、永磁体易退磁等缺点,限制了其应用范围.为此,将永磁同步双转子电机中的内转子替换为同步磁阻转子,对原始电机正弦性较差的外气隙磁通密度、内外转矩分别进行了改进,将传统磁极变为Halbach磁极,对8分段的Halbach磁极阵列进行了结构优化,通过傅里叶分析比较了几种不同结构的气隙磁通密度谐波含量,利用参数化扫描,给出了最佳倒圆角半径,此结构也提高了外转矩.将同步磁阻转子改为永磁辅助式同步磁阻转子,对比分析了永磁体在不同放置方式下的内转矩大小,并分别给出了其磁链和电压方程,结果证明这种结构下的内转矩有较大提高.

Traditional inner-rotor permanent magnet motors have high power density, high efficiency, and a wide range of applications.However, they also have disadvantages such as relatively limited speed range, relatively limited overload capacity, poor heat dissipation, and easy demagnetization of permanent magnets, which limit their application range.Therefore, the inner rotor of the permanent magnet synchronous double-rotor motor is replaced by a synchronous reluctance rotor.The external air gap magnetic density and internal and external torque of the original motor with poor sinusoidal properties were improved respectively.The traditional magnetic poles were changed to Halbach magnetic poles, and the structure of the 8-segment Halbach magnetic pole array was optimized.The air gap magnetic density harmonic content of several different structures was compared through Fourier analysis, and the parametric scanning was used to give the best rounding radius, and this structure also improves the external torque.The synchronous reluctance rotor was changed to a permanent magnet-assisted synchronous reluctance rotor.The internal torque of the permanent magnets under different placement methods was compared and analyzed, and its flux linkage and voltage equations are given respectively.The results prove that the internal torque under this structure is greatly improved.