Design And Realization Of Fully-digital PWM DC Motor Speed Regulation And Servo System

With the development of devices and power-control technology, the PWM mode and servo control using fully controlled power devices already becomes mainstream. Motion control system, with the characteristics of high practice, rapid update and great teaching difficulty, etc, is the core curriculum of electrical automation major in college. Designing a high open experimental platform fitting for teaching which is matched with the present contents of teaching is necessary, and on which the integrated and designing experiments can be carried out. The thesis takes satisfying the electrical automation major student's experiment of"motion control system"as command. Based on the theory of PWM for DC motor speed regulation and servo system,the author has a further research on the fully-digital control technology.First, the thesis summarizes the theory and realization of PWM for DC motor speed regulation, and then analyzes the principle and performance about unipolar and ambipolar drive. Ambipolar drive with broader application and better performance is chosen as the control method of speed PWM regulation and servo system for DC motor.A digital experimental platform of speed PWM regulation and servo system is researched and designed in the thesis, where a kind of master-slave computer architecture is applied and the DSP-TMS320LF2407A is chosen as the core controller. What is more, the design scheme of hardware and software is also proposed. The thesis introduces the hardware design scheme about control circuit, power circuit and excitation power in details, including the power conversion circuit base on IPM, Switching Power Supplies, the minimum system of DSP, the current detection circuit, D/A conversion circuit and communication interface circuit and so on. The software of double-closed loop speed PWM regulation and three- closed loop servo system is designed and tested also. In order to manage control system, change parameter, observe graph easily, the thesis has developed the PC software which works together.On this experimental platform, many experiments are engaged. The results demonstrate that the design of hardware and software is reasonable and practicable. The desired result has been achieved.