Applicationg Of Genetic Algorithms Optimistic Design For Tubular Linear Induction Motor

The traditional straight lever oil pumping unit is also called kowtow machine. The heavy sucker rod, which is more than one thousand meter under the ground, is easy to be distorted and ruptured, so it usually involved more malfunction and expensive maintenance cost. Moreover, the energy consume of the motor is also very large, as a result, it is considered unfit for the oil-field application. However, it is still used in more than 90% oil-field all over the world. Therefore, how to avoid the utilization of the sucker rod become the challenging problems in the petroleum engineering for the experts around the world.The tubular linear motor designed in this paper can make oil pumping unit reciprocate without need of the machine conversion equipment. By contrast with traditional linear oil pumping unit, the efficiency of this system is raised, the total inertia of kinematical is reduced, the startup torque is increased, the startup current is reduced, the power supply and circuitry are correspondingly reduced, and consequently, the investment of equipments and can be also significantly declined. Thereafter, tubular linear motor prevails over the rotating motor to drive pumping unit in a couple of factors such as the production cost, efficiency, the weight, the volume and the force, and so on. It will make great contribution to the oil-field production.This content of this paper includes: Firstly, the advantages of linear motor is analyzed. Secondly, the algorithms theories, searching steps and characteristics of genetic algorithm are presented. Based on validation of genetic algorithm with the simple and complex functions, and by inserting inversion operator and fastest-declining arithmetic operator into the genetic algorithm, the disadvantages of genetic algorithm that are longer at seeking optimization and slower to being convergent are overcome. Thirdly, based on the principle of linear motor, the difference of linear motor and the rotating motor, as well as the transient magnetic field of tubular linear motor, is analyzed in details. According to equivalent circuit diagram of asynchronous linear motor, based on the compressive consideration of the end effect, the method to calculate the operating performance and electromagnetic field is proposed and programmed with FORTRAN language in order to optimize the design of tubular linear motor. The new design scheme overcomes many drawbacks of the traditional rotational motor, which decreases the volume of motor, increases the force, so it may greatly meet the future requirement of oil pumping unit for oil extraction.