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Firstly, the research status of Oil Field Mechanical Pumping was introduced, showing the weakness of beam-pumping unit. An original multistage assembled line motor was present in this literature. Secondly, the operating principle of assembled line motor was introduced. The electrical parameter of the line motor was designed, making the rated thrust be 18595Nm, while the control system was finished at that time. By using the finite element method (FEM), oil pressure, electromagnetic field and temperature field were simulated and analyzed. In this paper, the simulation and analysis will provide certain reference for the research of linear pump, especially for multi-section linear motor pumping unit.

Combining with the low-speed motor design features in the final scheme, some electromagnetic design formulas of low speed direct-driven PMSM in the thesis are used to achieve structure design of the motor, parameters calculation, work characteristics and analysis of the starting characteristics. Using electromagnetic analysis software ANSYS, the motor transient performance parameters by the field circuit coupled method was calculated. And through continuously adjusting the design value, the electromagnetic design scheme is obtained. These results show that data of the low speed direct-driven, low speed and high torque permanent magnetic synchronous motor experimental. The results of the application program design are basically consistent. It also shows that the program is feasible, simple and convenient. The research work of the thesis has important theoretical meanings and engineering values so that the design of PMSM can be improved in the future.