Research And Design Of Active Solar Tracking And Drive System

Solar energy is a kind of energy with great potential development, and many countries is trying to utilize it. The use of solar energy is developed very fast in our country in recent ten years. But the technology of utilizing solar energy is still relatively backward, and the application of solar energy is restricted by many factors. To widen the use of solar energy and increase the utilization of solar energy, the solar energy tracking and driving system is designed in this paper. The system can guarantee that the device of utilizing solar energy is vertical to sun streams, and it has simple structure, low cost and high tracking precision. The system can be used in many kinds of solar installations such as solar cooker and solar water heater, and it has high practical value.The basic working principle ,characteristics and some questions in the application of typical condenser are analysed. Motion law of solar-terrestrial is studied.Both sensors tracking and timing tracking mode are used.Sensors tracking mode is used in sunny days and timing tracking mode is taked in cloudy days.The two tracking mode can be switched automatically. The system are more stable, at the same time, In improving solar energy utilization ratio.In the paper, the designed solar tracking and drive control system are mainly composed of three major components: sensors, controllers and mechanical tracking platform.The sensor is mainly composed of four-quadrant photocell in the dark-tube and other four photocell outside the dark-tube which could achieve large-scale tracking the sun. C8051F020 is used as the core in the controller. Hardware circuit design and production are accomplished. The system hardware circuits are composed of clock circuit, analog input circuit, the motor drive circuit, power circuit and so on.Vertical shaft condenser tracking platform based on the Horizontal coordinate system takes azimuth and pitching mode,and takes worm-drive.To Overcome the uneven torque when tracking platform moving at the direction of altitude angle,the Spring Balancer is installed on the platform,which composed of washer, compression spring, pull rod and outer cylinder.The software design is finished, including system initialization, clock read and write, tracking Control, motor Drive module and so on. Through the experimental test, Sensor has a stable performance and its output has not saturated,in the sunlight,which can meet the needs of the Sun tracking.