Speed Sensorless Vector Control Of High Torque Pumping Ground Disc Motor

Conventional beam pumping unit is the mechanical application of the most extensive oil pumping equipment, which occupies a pivotal position in the machinery pumping unit. Pumping unit motor running at rated load is an economic operation; in fact, the majority of motor units are running at light loads, which are the root causes of beam pumping unit's low efficiency.The use of high torque disc motor instead of conventional beam pumping unit with space-saving, large starting torque advantages, so study the control method can reduce costs and operational safety with great significance. In the high-performance AC induction motor vector control system, in order to overcome the shortcomings of installing a speed sensor of vector control system in practical application, to further expand the scope of application, combined with the actual open field working conditions, the research of speed sensorless vector control technology has important theoretical and practical significance.In this paper, compared and analyzed different speed identification method based on speed sensor vector control system, we used MRAS-based speed sensorless rotor field-oriented vector control method. The method using pulse width modulation (PWM) control technology and field-oriented control (FOC) algorithm, in accordance with the principle of model reference adaptive speed identification, use the estimated value of speed for vector control.In view of this method, we established a speed sensorless vector control system simulation model and simulated it in the MATLAB / SIMULINK software platform. The results of simulation shows that the performance and accuracy of system control is good, which verified the feasibility and practicality. According to the simulation model of the system design, gives the main circuit structure and design parameters. We designed control circuit of the main control unit by TI's digital signal processor chip TMS320F2812, and designed the driver and protection circuits. This paper describes the achievement of software flow of DSP-based fully digital speed sensorless vector control system, the preparation of every module of the subroutine. We debugged the program in CCS2.0 software debugging environment.