The distinguished contributions of this paper are listed in details as the following . 1 . the multi - loop mathematical models under the conditions that the squirrel cage asynchronous motor is healthy , faulty with broken rotor bars or with stator winding inter - turn shorts are deduced thoroughly , and improved necessarily 本文的主要研究成果如下： 1 .详细推导了yn接、 y接、 d接笼型异步电动机在正常、转子断条及定子绕组匝间短路故障情况下的多回路数学模型。
Analysis for magnetic field of srm is very complicated since the flux waveforms in different parts of the motor vary with motor phase , stator pole and rotor number , also with the winding connections , etc , which results in the srm losses , especially iron loss calculation difficult . the temperature analysis due to the losses has become a study hot spot Sr电机铁心的磁通波形不仅与电机的相数有关,还与定、转子齿极数、定子绕组连接方式等密切相关,从而使得sr电机磁场分析很复杂,复杂的磁通密度波形导致电机损耗特别是铁损的计算非常困难。电机的损耗又会引起电机的温升,因此高性能的sr电机的热分析也成为目前的研究热点。
A novel resonant pole zvt three - phase pwm inverter circuit for three - phase ac motor driving is presented . the proposed circuit has the feature of being more flexible with three inverter arms in zvt process . using only one resonant inductance , the inverter can not only reduce the power loss of inductance but also avoid possibility of unbalance in motor ' s three stator windings 提出了一种针对三相交流电机驱动的新型谐振极零电压过渡三相pwm逆变器电路，该电路中三个逆变桥臂的零电压过渡更具有灵活性，仅使用一个谐振电感，既减少了电感损耗又防止了电机三相定子绕组可能存在的不平衡问题，并且谐振电感中残余能量能够回馈给电源；新型逆变器的辅助开关均工作在零电流开关条件下，并且控制逻辑简单。
Secondly , a series of novel detection schemes are presented creatively . furthermore , this paper proposes the joint detection scheme for rotor bar breaking and stator winding inter - turn short circuit fault in squirrel cage asynchronous motors , for the first time . meanwhile , a parameter identification technique based approach to detect stator / rotor over - heating fault is also presented 在此基础上，提出了异步电动机转子断条与定子绕组匝间短路故障检测新方法；首次提出了笼型异步电动机转子断条与定子绕组匝间短路故障联合检测方法；基于参数辨识技术，提出了异步电动机定转子绕组过热故障检测新方法。
Evaporative cooling has been regarded as a new cooling technology on hydro - generator , and it not only could increase the ratio of material utilization and reduce the difficulties of making large - scale hydro - generators , the running difference in temperature , the stress of the generator ' s stator and the possibilities of the incidental occurrences , but also has better performance than internal water cooling 蒸发冷却作为水轮发电机的一种新型冷却技术，不仅可以提高材料利用率，减小特大型发电机制造难度，降低发电机定子绕组运行温差和发电机定子的应力，减少事故隐患，更重要的是蒸发冷却比水内冷具有更好的优越性。
