| Nowadays, the using of reciprocating pump in the oil industry has been more and more wildly, traditional reciprocating pump has become more sophisticated in technology and at the same time there are many inherent problems in field application, such as excessive transmission links; lower overall system efficiency; piston speed varied wide in range, the exhaust pressure is instability; it is difficult to achieve the long-stroke,low-red times and large output by the power-side constraint. Driving reciprocating pump with linear motor economizes mechanism transmission links and overall the efficiency of reciprocating pump system; we can control the pressure of fluctuation accurately by controlling the linear motor closed-loop speed control system, so that the overall performance of reciprocating pump system has been optimized to be suitable for the special needs of different conditions. There will be a wide range for the use of applications of linear motor-driven reciprocating pump in the oil industry.In this paper, based on the oil industry of the technical requirements, a cylindrical high-power linear induction motor for reciprocating pump is designed, In the linear induction motor taking into account the end effect on the basis of the characteristics of the electromagnetic, calculation of electromagnetic of motor has been done. According to the results of the calculation of electromagnetic of linear motor , the mechanical characteristic curve is obtained; By changing the corresponding parameters, different air-gap value of start-up force were calculated .Be starting with the thrust of the curves of air-gap length and secondary thickness on the linear induction motor start-up curve force of the effects. The analytical calculation of the air gap magnetic field of cylindrical linear induction motor has been done, By using finite element analysis software ANSYS, the complex secondary eddy current loss is calculated, Obtained the thickness of the composite secondary effects of eddy current loss for the practical engineering of high-power linear induction motor. Secondary parameters and provides the basis for calculating the temperature-rise.Taking into account the high-power linear induction motor stator core of a long, serious heat on the linear motor, the finite element analysis of stator temperature field has great significance. In this paper, firstly, a model of cylinder-type linear induction motor stator temperature field is established to solve the finite element in the linear induction motor stator. Taking into account the special high slip rate and poor working conditions, the steady-state motor stator temperature field is analyzed with the application of finite element method, By changing the electrical parameters, the relation about the motor stator temperature field with the derived motor of copper consumption, heat dissipation coefficient of the surface casing, as well as the quality of impregnation of the stator winding temperature distribution in the electrical effects is obtained. Analysis of these factors on the sensitivity of motor stator temperature field has an important practical significance in guiding the design of electrical motors. |
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