双分数槽集中绕组低速潜油电机的设计分析

Design and analysis of double fractional slot concentrated winding for low-speed submersible motor

针对传统潜油电机需要配备减速器才能驱动潜油螺杆泵的不足,提出了一种驱动潜油螺杆泵的双分数槽集中绕组低速潜油电机,电机定子采用空间相距特定角度的两套分数槽集中绕组。根据特殊的绕组结构,对电机在不同时刻的磁势进行分析,表明电机能够产生恒定的电磁转矩。利用有限元法对电机进行二维瞬态场分析,得到了电机在空载和额定负载条件下的磁场分布及相关特性,结果验证了电机在电磁设计上的合理性。所设计电机可实现在不增大电机定子外径的情况下增加电机的极数,降低同步转速,有望实现潜油电机直驱潜油螺杆泵,从而有效降低整个采油系统的成本,抽油质量大为提升,对整个系统的节能具有重要意义。

Aiming at the deficiency that traditional submersible motor equipping with speed reducer can drive the oil submersible screw pump, a double fractional slot concentrated winding for low-speed sub- mersible motor which can drive the submersible screw pump was proposed. Two sets of fractional slot con- centrated windings connected in series was used in the stator of this submersible motor, and the second winding was shifted mechanically for a specific angle referred to the first winding. According to the spe- cial winding topology, the magnetic motive force of this motor in different times was analyzed, and the constant electromagnetic torque produced by the machine was verified. The magnetic field distribution in different load conditions and correlated characteristics were obtained by 2D finite element method （FEM）. The analysis results not only validate the rationality of electromagnetic design of the motor, but also indicate that without increasing the outer diameter of the stator and the number of stator slot, which is easy to increase the number of poles of this motor. The synchronous speed was reduced, and submersible cavity pump directly driven by submersible motor was possible. The cost of the entire pumping system re- duced effectively, and pumping oil quality was greatly improved. It is significant to the energy efficiency of the entire system.