Design Of The Micaslot’s Automatic Detection And Control System Based On CCD Image Sensor

A long time, the carving technology of the DC motor commutator mica slot has been relatively lagged behind, and it can’t achieve precise positioning in the process of carving cutting. At present, the domestic application of under-cutters need to manually repair, with a large amount of labor, and poor accuracy, low efficiency. With the improvement of automation and the development of electro nic technology, the automatic carved technology becomes the necessary trend of mica slot under-cutter. In this paper, aiming at the problems existing in the under-cutters, combined micro-controller technology, sensor technology, image processing technology, and AC servo technology together, we developed a set of mica slot’s automatic detection and control system based on CCD image sensor. It implements to find the slot, and positioning automatically at the process of carving cutting and reduces the amount of labor. It is of great significance fo r the development of mica slot under-cutter.The whole system work process is done under the control STM32 microcontroller. First of all, a CCD camera was used to extract the images of commutator mica slot. The video signal collected by CCD is divided into two roads, one way to the monitor, the other way after dealing with the peripheral circuit to the single chip microcomputer for processing. Through the software algorithm extract the position of the center line of the mica slot, then according to the control algorithm to control the operation of the machine, and adjust the motor’s steering and speed, to make the center line of the mica slot to aligne with the knife.The main task of the paper is divided into two portions,the mica slot position detection and controlling the motor accurate positioning. Before the system design, do simulation to verify the feasibility of the system program, and then design the system. First, select the system controller, and then design the image data acquisition circuit, including video separation circuit and video identification circuit. In addition, design the servo system for controlling the commutator accurate positioning. In order to facilitate observation and program debugging, the system also designs the man- machine interface module and communication module, through the touch screen interface to control the program, and PC display the collected image data.After acquiring the data to the controller, process the data, extract mica slot’s center line, and control the servo motor based on mica slot position. Based on the identification signal separated from the video separation circuit, microcontroller intercepts part of the image data, the collected data is processed by the filter and edge detection. According to the detection of mica slot line that determines the location of the mica slot. Then control server motor to rotate and locate. Positioning design divides into two parts, coarse positioning and precision positioning. Coarse positioning control motor driven commutator switch from the current slot to the next slot. Precise positioning uses of PID control algorithm which controls the motor drive mica slot for accurate positioning.Finally, design related experiment to test the performance, and the experimental data are given. Analyze the data and present error causes and solutions. Laid the foundation for the follow- up work, and determine the direction of the further research.