铁氧体多极磁环与磁瓦在永磁电机中的应用对比与分析

Application contrast and analysis between ferrite multipole magnetic ring and tile in the permanent magnet motors

无刷直流电机是家用电器、汽车等领域替代传统的电励磁电机的典型节能环保产品,发展前景广阔。通过对永磁铁氧体多极磁环转子和磁瓦组合转子的结构对比及磁化(取向)机制和磁性能的对比,说明在某些微电机中采用多极磁环比用磁瓦具有显著优势:机械精度高、运行稳定、噪声小,磁化波形为正弦波,且幅值高于磁瓦组合环。这些特点很好地满足了无刷直流电机需要。同时,家用电器的发展促进了多极磁环取代磁瓦,在某些微电机取代磁瓦已是必然趋势。

Brushless DC motor is a typical energy saving and environmental protection product that replaces traditional electric excitation motor in household appliances,automobile and other fields,so it has broad prospects for development.Comparing with magnetic tile combination rotor in structure,magnetization(orientation)mechanism and magnetic performance,it shows that in some micro-motors the ferrite multi-polar magnetic ring has some significant advantages,including high mechanical precision,stable running,low noise and sine wave distribution of the magnetization waveform.These characteristics of multi-pole magnetic ring meet requirements of brushless DC motor very well.At the same time,the development of household appliances has promoted the replacement of multipole magnetic ring for the magnetic tile,an inevitable trend in some micro-motors.