摘要
电动机的堵转电流是反映其起动性能的一项重要指标,对自起动稀土永磁同步电动机的大量实测过程中发现,其三相堵转电流的幅值明显不相等,且随转子堵转位置不同发生变化。本文以现场55kW样机为例,利用时步有限元方法对不同情况下的堵转起动进行计算,通过研究磁通密度的变化与分布,分析转子磁路结构不对称及永磁体引起的饱和对堵转电流的影响,揭示了造成永磁电机三相堵转电流幅值不等的主要原因在于永磁体所引起的饱和对各相磁路作用不均衡,即"堵转饱和效应"所导致。结合现场实测数据,对比转子不同位置、永磁体不同型号下堵转电流的计算结果,说明结论的合理性。
Locked-rotor current is an important factor which indicates the starting performance of a motor, however, a phenomenon is discovered during lots of tests on the line-starting permanent magnet synchronous motor （PMSM）. The amplitudes of three-phase locked-rotor current is different distinctly, and change with the position of the locked rotor. In order to find out the essential reason of this phenomenon, a 55kW PMSM is taken for example and time-stepping finite element method （T-S FEM） is utilized for calculating the locked-rotor starting in different cases. The effect of asymmetric rotor magnetic circuit and saturation caused by the permanent magnet on the locked-rotor current is analyzed through researching flux density changes and distribution. And the main reason for the different amplitude of three-phase locked-rotor current is revealed. The saturation caused by the permanent magnet can play the unbalanced role on the magnetic circuit, which is locked-rotor saturation effect. Referring to the measured data and comparing current calculation results with different rotor locations and tyoes of parameter magnet. The availability of the conclusion is verified.
出处
《电工技术学报》
EI
CSCD
北大核心
2009年第8期52-57,共6页
Transactions of China Electrotechnical Society
基金
国家自然科学基金资助项目(50777018)
