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

作者：Meng Da Wei; Liu Zhi Hui^*; Xu Yong Ming; Xiao Shi Yong

来源：Electric Machines and Control, 2014, 18(1): 44-49.

• Design and analysis
• Electromagnetic designs
• Electromagnetic torques
• Finite element simulations
• Fractional slot concentrated windings
• Magnetic field distribution
• Magnetic motive force
• Motor design

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 submersible motor which can drive the submersible screw pump was proposed. Two sets of fractional slot concentrated 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 special 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 reduced effectively, and pumping oil quality was greatly improved. It is significant to the energy efficiency of the entire system.

• 出版日期2014