高精密单轴伺服转台结构设计

文中从总体需求出发，设计了一台高精密单轴伺服转台。根据总体技术指标要求，确定转台与安装平台及负载的接口尺寸；通过计算转台承受的负载和实际工况，选择直流力矩电机直接套轴驱动的传动方式；依据光栅测角传感器特点，选择单光栅与2个读数头结合的方式来提高测角精度。采用有限元分析方法完成转台的静力学性能分析和动力学模态分析，得出在仿真条件下转台的应力分布和位移分布情况以及转台前6阶振型和固有频率。结果表明，该型转台满足系统的技术指标要求，设计合理可行。

Structure Design of High Accuracy and Single-axis Servo Turntable

A high precision single axis-servo turntable is designed from the overall requirement in this paper. According to the requirements of the overall technical index, the interface sizes of the turntable, the installation platform and the loads are determined. By calculating the load of the turntable and the actual work conditions, the transmission mode of direct sleeve shaft drive of the DC torque motor is selected. According to the characteristics of the grating angle measuring sensor, the combination of a single grating and two reading heads is selected to improve the angle measuring accuracy. The static performance analysis and dynamic modal analysis of the turntable are completed by finite element analysis method. The stress distribution and displacement distribution of the turntable as well as the first six vibration modes and natural frequencies of the turntable are obtained under simulation conditions. The results show that the turntable meets the technical requirements of the system and the design is reasonable and feasible.