转轴扭曲及单元组合对潜油螺杆泵直驱永磁电机转矩脉动的影响研究

针对潜油螺杆泵直驱永磁电机负载运行时,其细长轴发生的扭曲形变及单元组合式结构带来的转矩脉动问题,利用有限元仿真分析,对该潜油电机负载运行时转轴扭曲角度进行了准确计算,详细分析并验证了该潜油电机转轴扭曲角度与转矩脉动之间的关系,研究了单元组合式的特殊结构对该潜油电机转矩脉动的影响,通过理论分析了其影响程度,找到了削弱单元组合式结构带来的转矩脉动的方法,并通过研制样机及样机实验,检验了此种削弱方法的有效性。研究结果表明:该潜油电机转轴扭转角度较小,对电机转矩脉动的影响很小;单元组合式的结构对该潜油电机的转矩脉动影响较大,通过改变相邻单元电机定子的相对位置可有效削弱由此带来的转矩脉动,为削弱单元组合式电机转矩脉动提供了思路。

Shaft torsion deformation and unit-combination on torque ripple of permanent magnet motor for direct-driven submersible screw pump

Aiming at the torque ripple problem of direct-driven submersible screw pump permanent magnet motor brought by its slender shaft torsion deformation when the motor operated with load and unit-combination structure, the shaft torsion deformation angle was accurately cal-culated by finite element simulation, the relationship between torsion deformation angle and torque ripple was analyzed in detail and proved, the influence on torque ripple brought by unit-combination structure was studied, method which can reduce the influence was found and proved by prototype experiment. The results indicate that the torque ripple brought by shaft torsion deformation isn't obvious;the unit-combi-nation has a great influence on the torque ripple of the submersible motor, changing the relative position of adjacent unit motor stator can re-duce this influence effectively which can provide some suggestions about reducing the torque ripple of unit-combination motor.