The Design Of Structural And The Analysis Of Temperature Field Of Combination Submersible Screw Pump Direct-drive Permanent Magnet Motor

With the increase of the depth of oil well production, there are more deviated well andhorizontal well that traditional rod production and equipment cannot adapt. Submersiblescrew pump is a kind of stockless production of oil equipment, that can effectively avoidtubing and sucker rod wear equipment of the traditional production and can widely be usedin oil production in horizontal well and deviated well. Traditional submersible screw pumpdrive motor is constituted by the induction motor with deceleration institutions which havelow efficiency and high maintenance costs. Reasching combination submersible screwpump direct-drive permanent magnet motor with low speed, high torque, highperformance.A new type of combination submersible screw pump direct-drive permanent magnetmotor is come up that the traditional super slenderness ratio of the motor is divided intoseveral conventional slenderness ratio composite permanent magnet motor. Each unit ofthe motor is independent on the mechanical and electrical. Reasonable groove verycooperate to reduce the cogging torque of the motor. The reasonable shape of the statoryoke make full use of the stator yoke of space. The uneven air gap and the cylindrical rotoron the optimal design of magnetic bridge isolation Optimization of magnetic circuit of themotor, reduce motor racing back emf and air gap flux density waveform distortion rate,reduce the cogging torque of the motor，to improve the performance and stability of themotor.Because of the more complex process of the internal heating and cooling and specialworking condition, the temperature cannot be directly measured. The winding loss andcore loss and mechanical loss in the steady state in the process of submersible motor wascalculated. The FEM was used to solve3D steady-state temperature field. As well as theprototype rise experiment and FEM analysis under the normal temperature state wascompared, calculation results show that the two methods is consistent in all parts of themotor temperature. The calculation method and result was accuracy. The temperature rise of the submersible motor meet the requirements of the insulation class. Based on theanalysis of Ansys finite element, through the modeling, analysis of the motor shaft, thestress distribution and the deformation distribution of motor shaft is obtained. The shaftstrength is checked, this design is verified in the rationality of the design of motor shaftthat verify the rationality of the design of the motor shaft. Finally, through reverse drivingexperiment, load experiment and temperature rise experiment of the prototype, comparedthe experimental data and theory of design data of combination submersible screw pumpdirect-drive permanent magnet motor, the electromagnetic parameters of prototype meetthe design requirements generally.