基于复合线圈结构的新型无刷双馈电机的起动性能研究

Study on Starting Performance of a Novel Brushless Doubly-fed Machine Based on Composite Coil Structure

由于无刷双馈电动机存在起动电流大、起动转矩小的不足,导致电机起动性能达不到工业应用要求。为了解决这一问题,提出一种转子绕组采用复合线圈组和变极法设计的无刷双馈电机,并结合设计实例进行详细分析。这种转子结构使得电机在起动工况下增大转子绕组电阻折算值,从而有效地降低起动电流和提高起动转矩。通过建模仿真对复合线圈组转子结构的起动性能、普通线圈转子结构起动性能和无刷双馈电机异步起动方式的起动性能进行研究,对比3种情况下的起动电流、起动转矩和起动时的饱和情况。样机试验结果表明,转子绕组采用复合线圈组结构的无刷双馈电动机具有起动电流小、起动转矩大的特点,有效地改善了无刷双馈电机的起动性能。

Because of the shortage of large starting current and low starting torque,the starting performance of brushless doubly-fed machine (BDFM)cannot meet the requirements of industrial application.In order to solve this problem,a novel BDFM designed by the theory of composite coil group and changing-pole method was put forward,and the design example was analyzed in detail according to the prototype.The proposed rotor structure can increase the converted resistance of windings,thus to reduce the starting current and increase the starting torque effectively.With the comparison between composite coil rotor structure and common coil rotor structure, the modeling and simulation part illustrated the starting performance of BDFM with asynchronous starting mode,the starting current,starting torque and saturation were selected as comparing parameters.The results of the prototype test shows that the novel BDFM with composite coil group structure has the characteristics of decreasing starting current and increasing starting torque,which can effectively improve the starting performance.