Research On The PMSM Control System Of Pumping Unit

Permanent Magnet Synchronous Machine(PMSM)has been 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 excitation motor and control system in many fields.PMSM are importance approach to the problem that the cost of oil extraction in Chinese oil fields is too high and pulling small car with big horse at large in driving electromotor in pumping unit.In the dissertation, the research is focused on the design and exploitation for PMSM controller in pumping unit in oil fields. Naturally the paper originates from the PMSM itself, discusses the steady operation theory, analyses the torque character of PMSM, power character and efficiency as well.Vector Control(VC) theory is one of the greatest breakthroughs in the AC speed control field. Also details of the VC of PMSM is presented in the paper, and the analysis of several circuit control strategies of VC theory applied to the PMSM control, which include the id=0 control and high efficiency control. The simulation results show perfect dynamic performance and minor static error characteristic.A complete digital PMSM system based on digital processor is developed with the soft and hard ware design plans given.the rotor speed of PMSM can be self-adjustable by the supervisor of DC current and AC current, adaptive U/f control achieves by use of high efficiency. Similarly, I research the connecting grid power, and phase pre-estimation control technology is used to switch motor to AC power, the process of switching is plainly. We test the Transducer for PMSM, the results have good performance.