Research Of Dtc System Of Pmsm Used For Oil-pump

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. This paper do some research on the theory, scheme and the concrete technology of PMSM DTC,do the corresponding simulation ,and proved the preliminary feasibility of the scheme.The paper do the following work:I.The paper introduces the using actuality of pumping unit and the application permanent magnet synchronous motor in pumping unit.Then discusses the configuration of permanent magnet synchronous motor and it's mathematical model in different coordinate,and discribes the principle of coordinate transformation.II.The postulate of direct torque control is analyzed,and the simulation model is built based on the parameter of permanent magnet synchronous motor.And the paper using MATLAB do simulation to the PMSM DTC by imitate the system of pumping unit and analyse the simulation waveform.III.The paper Put forward that applies fuzzy PI control of pumping unit permanent magnet synchronous motor with direct torque control system,which Using fuzzy PI controller as the speed regulator of direct torque control system.That can real-time adjusting on-line PI controller parameters according to the error of speed and torque. Compared with the traditional PI controller, Fuzzy PI adaptive control system have faster respons speed in the start and more stable transition process .Morever,the system have stronger adaptive ability of speed regulation.