Research On Servo Control Technology Of Measurement Platform For Optical Aspheric Surface

High accuracy aspheric components are applied popular in the area of optical design, because it's well performance in optical characteristic compared to the normal spherical. Aspheric component acquires precisely machining and highly measurement evaluation that relate to spherical component. To achieve the precise product, effective servo control platform that increase the measurement accuracy is one of the necessary conditions. The paper study on the structure of measurement platform and its working element as the background of motion control system of aspheric measurement platform. And the control system based on the digital signal processor is designed by embedded technique.The control scheme combine the PID control arithmetic that joint by integral separated and dead zone control with mixed closed loop control method. In the mixed closed loop, the feedback signal collected by the rotor encoder from half closed loop stands for the speed and corner information, and the feedback signal collected by linear raster from full closed loop stands for the position information of the platform. The system gets the better performance in position control via the simulation of algorithms Model and experiment testing.On the platform, there are three linear axis driven by AC servo parts that contains the advantages of tight framework, high security and good service. The rotor is driven by DC servo part that contains the advantages of easy control, load without slowdown and startup with great torsion. Both of these are satisfied by the requirement of the control system.Meanwhile, the paper has the further study on the hardware and software design of the muti-axis servo control. The hardware uses the TMS320F2812 as the core processor that supplies the functions of muti-axis motion control, D/A convert, logical control, resource management and communication. The software is complied mainly by C language in the way of modularization programming that advance the efficiency and increase the currency and shift. It's good for the system to maintain and upgrade. It's a high-powered motion control board with its hardware and software design opening.