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论述了机械限位结构的必要性及其特点。提出了改进的设想，并同时提出花键接头结构的应用是部分回转电动装置驱动轴结构的发展趋势。
The necessity and characteristics of mechanical limit structure are discussed. Put forward the idea of improvement, and at the same time put forward the application of the spline joint structure is the development trend of the structure of the drive shaft of the partial rotary electric device.