Design of Flexural Bearings in Experimental Analysis and PID Control of a Voice Coil Actuator
摘要
Flexural mechanisms offer significant advantages over traditional rigid structures, especially in situations where pinpoint accuracy and precise positioning within micron ranges are essential. To achieve efficient and straightforward motion, we have devised a novel voice coil motor mechanism. The selection of the appropriate coil and magnet considers the maximum force required for subsequent operations. We then proceed to manufacture and assemble the elements of the voice coil motor (VCM). We link the VCM to a dSPACE DS1104 R&D microcontroller in order to achieve mechatronic integration. This enables us to apply the required amplitude and frequency of motion using a linear current amplifier (LCAM), which serves as the driver circuit for the VCM. A linear variable differential transformer (LVDT), which offers an analogue voltage output proportional to the shaft's displacement, is used to track the movement of the VCM's output shaft. We created a PID control algorithm in MATLAB Simulink and applied it to the VCM to increase accuracy. When operating at an amplitude of 100 μm, this implementation had an inaccuracy of just 1.5 μm.