Research On The PMSM Servo System Based On DSP

Permanent Magnet Synchronous Machine(PMSM) has been paid more attention in the past two decades by researcher in the motor and control system fields because of its excellent performance for example small cubage, great power density and good efficiency. We can foresee the further development about PMSM and its control system with the reduce of the permanent magnet material`s price and producing the rotor, progress in the power electronics apparatus and high-speed processor and control theories. PMSM may take the place of common power excitation motor and control system in many fields.Based on the research of operation theory of the PMSM, the details of the field-orientation vector control theory are presented in this paper. Then a full-digital PMSM servo system is developed based on DSP. Firstly, this paper originates from the motor itself, discusses the steady operation theory of PMSM. The characteristics of the torque, power and efficiency are analyzed as well. Secondly, the vector control theory of PMSM is introduced deeply. The mathematical models of PMSM are illustrated. Continuously, the scheme of vector control on PMSM is discussed and the block diagram of this system is provided systematically. Additionally, SVPWM modulation is discussed thoroughly and its realization method with software is developed. Finally, the main structures of the software and hardware parts of the control system are introduced. Principles and realization of the main functional blocks of these two parts are illuminated. On the hardware of the system, parts of control circuit and the design and debugging of peripheral circuits are discussed thoroughly. Based on the hardware circuit, the software is programmed with C language. Three close loop vector control with feedback of position, speed and current are realized.