Design and analysis of a dual-stator brushless doubly-fed induction machine with a staggered dual-cage rotor

In this paper,a new dual-stator brushless doubly-fed induction machine with a staggered dual cage rotor is proposed,with emphasis on the general interconnection rule of the conductor bars for the staggered dual cage rotor.Since the squirrel cage rotor offers the merits of robustness,reliable structure,high slot filling factor,and low rotor resistance comparing to the wound rotor,it is introduced to the dual-stator brushless doubly-fed induction machine to solve the problems of high copper loss and unreliable rotor structure for the dual-stator brushless doubly-fed induction machine with a wound rotor.The originality of this article is to investigate the interconnection rule of conductor bars between the inner and outer cages.The constraint condition that is supposed to be satisfied is deduced by using the rotating magneto-motive force theory,based on which diverse slot/pole combinations are investigated.The performance comparison between the existing and proposed machines is conducted.Finally,a prototype is designed and fabricated.The experimental results verify the effectiveness of the proposed topology.

分段式笼型转子无刷双馈电机的设计与分析

无刷双馈电机(BDFM)在风力发电系统中具有广阔的应用前景。其转子的磁场调制能力优劣直接影响着该类电机的功率密度和效率。基于笼型转子结构提出一种分段式笼型转子结构。介绍了BDFM的拓扑结构和变速恒频发电的基本原理,将几种笼型转子结构的BDFM进行有限元对比分析,深入研究转子导条间隔角度和导条层数对新型转子耦合能力的影响,确定了使得分段式笼型转子具有较强磁场调制能力的结构参数。结果表明:该新型转子结构在保证一定耦合能力的情况下,端部空间利用率更高,电机功率密度更大,且转子结构简单可靠、易于制造。

一种新型直流电机的理论研究

设计出一种既具有直流电机所具有的调速性能好又具有鼠笼异步电机结构简单、维护方便的一种新型电机的雏形,并对其工作原理及控制回路进行了初步的探讨,并基于Matlab/Simulink软件进行了系统控制仿真,验证了其具有良好的调速性能。

笼型无刷双馈电机转子导条优化设计

针对笼型无刷双馈电机转子设计方法不完善的问题,从分析笼型无刷双馈电机的内部磁场入手,推导了无刷双馈电机在稳态运行时转子电流的解析表达式,利用迭代法在考虑转子电阻的情况下选择最合适的转子导条截面积,为笼型无刷双馈电机的转子设计提供了理论依据。通过有限元仿真,验证了理论推导的正确性。研究结果不仅有助于在设计时快速计算笼型无刷双馈电机转子电流,也有助于优化转子结构设计。

无刷直流电机转子供电保持架的冲压工艺

将无刷直流电机转子供电保持架的加工工序分为7步,即工序1落料、工序2弯曲、工序3弯曲、工序4冲孔、工序5成形、工序6翻边、工序7攻丝。利用有限元模拟软件DEFORM-3D,分析了弯曲工序2的可行性,结果表明,在弯曲过程中不会出现断裂等不良现象。对弯曲工序2的工艺参数进行了正交试验,结果表明,当冲压速度为2.2 mm·s^-1、模具间隙为0.02 mm、摩擦系数为0.16、凹模圆角半径为1.0 mm时,工件回弹量最小。采用弯曲模具型面补偿,能有效地控制转子供电保持架的回弹量,对弯曲工序2而言,1.02倍的补偿值效果最好。在最优工艺参数组合作用下,并结合弯曲模具型面补偿,得到P1点的回弹量为0.28 mm,P2点的回弹量为0.23 mm,P3点的回弹量为0.08 mm。最后进行了试验验证,试验结果与模拟结果吻合较好。