5/5/2023 0 Comments Xy flexture![]() These mechanisms are especially used in applications like ultra-precision diamond turning machines. Symmetric geometry in DPF provides flexibility in design tradeoffs that result in enhanced performance parameters such as positioning accuracy. The fundamentals of elastic averaging and its advantages have been illustrated using a three-beam parallelogram flexure mechanism that improves the performance and strength. The significance of symmetrical topology in XY flexural mechanisms has been a major consideration in reducing errors and this symmetric arrangement of double parallelogram flexural (DPF) modules has been considered in previous work. These stages have many commercial applications such as laser scanning, biological scanner applications (e.g., tracking of bio cells using optical twizzers), stereolithography applications for the development of prototypes, micromachining and scanning probes (like the scanning tunneling microscope (STM), atomic force microscopy (AFM), etc.) and the use of various actuators like voice coil motors (VCMs) and piezo-electric actuators. The progress in the fields of electronics, material science and advanced manufacturing has made increasing demands for ultra-precision technology like micro and nano-positioning stages. The position determined by the position estimator algorithm has an accuracy of 99.4% for single direction motion with the experimentally observed position at those instantaneous states. Further, proportional-integral-derivative (PID) control strategy was implemented along with developed algorithm to minimize the error. Theoretical and experimental results revealed successful implementation of the proposed novel algorithm in the feedback control system with positioning resolution of less than ±5 microns at the scanning speed of more than 5 mm/s. The experimental setup consisted of the flexural mechanism, voice coil actuator, current and voltage monitoring circuitry and its interfacing with PC via a dSPACE DS1104 R&D microcontroller board. Proposed position estimator was experimentally validated for the voice coil actuator in integration with electro-mechanical modeling of the flexural mechanism. This eliminates the use of a sensor that is an integral part of all feedback control systems. ![]() ![]() According to the proposed algorithm, the position of coil relative to the fixed magnet position depends on the current drawn, voltage across coil and motor constant of the voice coil motor. Here, a voice coil motor was used as an actuator and a sensor using the position estimator algorithm, which was derived from an electro-mechanical model of a voice coil motor. This article presents a novel concept of the position estimator algorithm for voice coil actuators used in precision scanning applications.
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