过去，异步感应电动机的主要缺陷是难于变速。
In the past, the main disadvantage of asynchronous induction motors was the difficulty of varying their speed.
由于屏蔽电动机螺栓的制造工艺所决定，在其表面及近表面易存在缺陷。
There is defects on the surface and near surface of the bolt in canned motor pump because of manufacturing technique.
分析了煤矿井下小型隔爆电动机过载、断相保护存在的缺陷，提出了改进的保护方案。
The existing defect of overload, open phase protection of minitype flameproof motor used in coal mine was analysed and its improved protection scheme was presented.
将谐波传动技术应用于超磁致伸缩电动机中，研制新型超磁致伸缩谐波电动机将可以有效克服这些缺陷。
It is an effective solution to overcome the deficiency mentioned above that introducing the harmonic drive technology into conventional motor driven by giant magnetostrictive material.
由于屏蔽电动机螺栓的制造工艺所决定，在其表面及近表面易存在缺陷。
There is defects on the surface and near surface of the bolt in canned motor pump because of manufacturing technique. So, we adopt magnetic powder detection of faults to inspect it.
目前电动机的控制及保护的采用的组合式电路存在控制功能不强、保护功能不完善的缺陷。
At present the control and protection of relay of electromotor USES combined circuit, which has the limitation of weak control and faulty protecting function.
目前电动机的控制及保护的采用的组合式电路存在控制功能不强、保护功能不完善的缺陷。
At present the control and protection of relay of electromotor USES combined circuit, which has the limitation of weak control and faulty protecting function.
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