Electromagnetic Design And Dynamic Simulation Of Self-Adaptive Energy-Saving Motor For Oil Pumping

During the process of oil production, the motor for oil pumping works under light or idle condition usually, the power factor and efficiency of the motor are very low. Not only a large quantity of energy is wasted, but also the supply quality of electric network is decreased. In view of this situation, the energy-saving motor for oil pumping is studied in this paper. The development situation of energy-saving motor in domestic and foreign is introduced in the first part of this paper, and the energy-saving principle and shortage of those energy-saving motor are analyzed too. Based on this, considering the domestic geological condition and the use of the existing equipment, the self-adaptive energy-saving motor consisted of two three-phase asynchronous motors which run coaxially is designed. With the effect of the energy-saving controller, the grade of the output power of the energy-saving motor can be changed automatically to make the motor run under largest possible load ratio. The whole subject is consisted of three parts mainly: electromagnetic design; development of the interface management software and dynamic simulation of the energy-saving motor. In the first part, the treating of curve, chart and iteration is discussed mainly in the CAD programming. According to the constraint condition of the energy-saving motor, the design project is presented and the electromagnetic check is carried through. At the same time, the value of the compensating capacitance, the switching threshold and the character curve of the motor are calculated. In the second part, the visual interface management software that has windows style is developed with C++ Builder. With the function of file management and graphics management the interface is very convenient to motor designer. In the end, based on the mathematic model of the asynchronous motor and combined with the working situation of energy-saving motor, the mathematic model under rotating dq0 coordinate system is built. At the same time, the effect of skin effect on the parameter of the motor rotor is considered and the corresponding modified formula of the parameter is provided. The simulation model of the motor is built with Simulink. With the simulation model, the starting or switching dynamic process of the motor is studied and the simulation result is analyzed.