The Automatic Variable Fertilization System Based On The Steeper Motor

Precision agriculture is a new type of agriculture which can combine high-tech and agricultural production. It is the important developing direction of modern agriculture. Precise fertilization is an important part of precision agriculture. Its purpose is on-demand fertilization. It can reduce fertilizer wasted and soil pollution, improve soil environmental, and increase crop yield and quality.The realization of precision fertilization needs the precise fertilization automation machinery. Present variable fertilization mechanical equipment still exist those problems such as structure complex, expensive, maintain inconvenience which restrict the variable fertilizer technology application and promotion.This paper research the stepper motor system applied to automatic variable fertilization. And it wants to develop an advanced, feasible, practical, and low cost of variable fertilizer equipment, so as to promote the development of precision agriculture equipment technology. This paper mainly carries out the following five aspects research work:First, a simple and easy variable fertilization operation mode was put forward. We partition operation area into many plots. The fertilizer amount is gat according to the fertilization decision-making system. The relation between the fertilizer and the rotate spped was established. The automatic variables fertilization work flow of the system was given. In these foundations, the paper presents the automatic variables fertilization system based on the stepper motor overall plan and module partition.Second, combined with the variable fertilization work, the stepper motor was calculated for type selecting. The YK110HB115 stepper motor was selected. By comparing stepping motor control schemes, PMC300 was chose as controller. Due to the controller cannot direct drive stepper motor, the constant-current chopping driving circuit of YKA2811MA stepper motor drive was adopted for power amplify. Completed the stepper motor system hardware construction, the parts connected carried on the detailed design, including the connection of computer and controller communication, and the wiring design between the controller, stepper motor and drive. Then the stepper motor control program was developed using motion logic. The program is used to control the speed to realize variable-rate fertilizing.Third, by comparison of various fertilizers mechanism ultimately chose the worm type distribution as fertilizer feeder. The worm type distribution was designed. It can provide guidance for the design of the worm type distribution.Furthermore, using Visual Basic 6.0 developed the variable fertilization decision system. Using BP artificial neural network predict fertilizer amount. The forecast results get feedback to VB fertilizer decision-making systems to control fertilizationFinally, the experiment device of the automatic variables fertilization based on the steeper motor was made, and then experiment was done. There are many factors affect fertilizer amount. The experiment included the height of the fertilizer in the can and the rotate speed affecting the fertilization amount. Then the relationship between the rotate speed and the fertilization amount was got. Next a variable amount fertilizer experiment was done. The experiment shows that variable fertilization device controlled by the stepper motor can realize variable fertilization.Anyhow, this research shows that the automatic variables fertilization system based on the stepper motor has fowling strong points: simple structure, cheap and easy control. Combined with decision systems, the application of stepper motor to the automatic variable fertilization is practicable. This research aimed at reducing fertilizer using and setting up the foundation to realize precision fertilizer.