Development of a micro-depth control system for an ultra-precision lathe using a piezo-electric actuator |
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Authors: | Jeong-Du Kim Soo-Ryong Nam |
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Affiliation: | aDepartment of Mechanical Engineering, Korea Advanced Institute of Science and Technology, 373-1, Yusong, Taejon 305-701, Korea |
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Abstract: | Micro-positioning systems using piezo-electric actuators have very wide applications, for example as in ultra-precision machine tools, optical devices and measurement systems In order to keep a high-precision displacement resolution, they use a position sensor and feed back the error. From the practical point of view, high-resolution displacement sensor systems are very expensive and it is difficult to guarantee such sensitive sensors to work properly in the hard operational environment of industry.In this study, a micro-depth control system which does not require a position sensor but which uses piezoelectric voltage feedback has been developed. It is driven by hysteresis—considering a reference input voltage which is calculated by computer, and then uses actuator/sensor characteristics of piezo-electric materials. Results of experiments indicate a fast and stable response of the micro-positioning system and suggest it is an efficient technique for controlling the piezo-electric actuator. |
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