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A Study of Full-digital and High Performance Brushless DC Motor Control Systerm

Author: LiJinFei
Tutor: WangHuiZhen
School: Nanjing University of Aeronautics and Astronautics
Course: Power Electronics and Power Drives
Keywords: Brushless DC Motor Digital DSP Four -quadrant operation PWM chopper Tail current PI controller
CLC: TM33
Type: Master's thesis
Year: 2009
Downloads: 74
Quote: 2
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Abstract


In recent years , with the rare earth permanent magnet materials, power electronics and microprocessor technology development to improve the performance of brushless DC motor has been widely studied and applied. As governor , especially small and medium- power high-performance motors and servo motors, aerospace, military , home appliances and industrial sectors have broad application prospects and research value. In this paper, aerospace applications as background, developed a high-performance DSP-based fully digital brushless DC motor control system . First introduced brushless DC motor of development and trends , analyzes the working principle of brushless DC motor , a mathematical model . On this basis , for the five kinds of PWM chopping mode analysis and comparison, a detailed analysis of a variety of non-conducting chopping mode phase current tailing phenomenon, thereby suppressing the torque ripple for the study provided the conditions . Given current, velocity loop control system for the detailed design of the regulator with PI controller. And using Matlab / Simulink simulation software to create a system model, current, speed, dual-loop simulation studies to further validate the correctness of the proposed program guide system of production and commissioning. In the theoretical analysis and simulation studies , based on the design of a fully digital platform 850W brushless DC motor control system prototype . The system is produced by TI TMS320F2812DSP chip as the control core, using power MOSFET three-phase bridge circuit constructed as the main power inverter module , IR3120 as driver chip. On the hardware platform , using C language prepared by the idea of modular programming system control software , and through the CAN bus and PC communication , real-time control and status display. Finally, the system debugging , gives the main experimental waveforms. Verify five PWM chopping mode tail current and experimental tests on the speed according to the system controller optimized experimental results show that the system has good dynamic and static performance , verify the correctness of the theory and simulation analysis for the the system further research and development has laid a solid foundation.

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CLC: > Industrial Technology > Electrotechnical > Motor > DC motor
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