Cogging torque analysis of parallel-shaft dual-rotor permanent magnet synchronous motor

In order to effectively analyze and weaken the cogging torque of the parallel shaft double rotor permanent magnet synchronous motor, the general principle for determining the air gap size in the parallel connection area of the parallel shaft double rotor permanent magnet synchronous motor was first given. Secondly, the calculation formula for the equivalent magnetic permeability of each part was given, taking into account the special structural parameters of the parallel connection area. Furthermore, an equivalent magnetic network model of the parallel shaft double rotor permanent magnet synchronous motor was established. The analytical expression of the cogging torque of the motor was established by the energy difference method. Then, taking a double 8-pole 54 slot parallel shaft dual rotor permanent magnet synchronous motor as an example, its 2D FEM calculation model was established. The impact of the size parameters of different structures such as the air gap, permanent magnet, slot width, etc. in the motor parallel connection area on the cogging torque was comprehensively analyzed, and an effective method to weaken the cogging torque of the parallel shaft double rotor permanent magnet synchronous motor was obtained, Finally, the Taguchi method was used to optimize the motor slot torque, and different parameters such as the air gap size in the parallel connection area, permanent magnet size, and stator slot width were used as optimization variables for analysis, effectively improving the performance of the motor. © 2023 Editorial Department of Electric Machines and Control. All rights reserved.