摘要
为解决微小型机电系统大行程、高精度进给的问题,设计实现了一种由旋转电机驱动的摩擦传动微进给机构。采用对称预紧设计使加于摩擦传动主支承轴承上的预紧正压力的合力为零、从而减少传动误差。当步进电机采用5万步/转细分驱动时,经减速比为10:1的摩擦传动机构,输出直线位移分辨率可达到0.16μm。位移测试实验显示该摩擦传动微进给机构具有可靠的运动传递性能,系统的位移输出特性基本上取决于所采用的步进电机及细分驱动电路的特性。进给速度可通过改变驱动脉冲的频率调节,机构在高频驱动大位移动作时亦表现出准确的步进特性,可用于小型机电系统的开环进给驱动。
A friction drive is ideal for micro feed systems with long strokes because of its simple structure and small backlash. A compact friction drive mechanism was designed for mechtronic systems with small loads. The friction drive mechanism incorporates oppositely preloaded normal forces against the main bearings to reduce transmission errors. Test results show that the output displacement resolution of the friction drive mechanism reaches 0.16 μm with a speed-reduction ratio of 10∶1 and the stepping motor is driven by a circuit subdivision of 50 000 steps per revolution. The friction drive mechanism has reliable movement with the displacement depending mainly on the behavior of the stepping motor and its circuit subdivision driver. The feed velocity depends on the driving pulse frequency. The friction drive mechanism moves well even when driven at high frequency and with long strokes, so it can be used with open-loop control systems for micro displacement.
出处
《清华大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2004年第2期170-173,共4页
Journal of Tsinghua University(Science and Technology)
关键词
步进电机
摩擦传动
微进给机构
开环控制
friction drive mechanism
micro feed
stepping motor
open loop control
