Electromagnetic Design And Torque Fluctuation Suppression Of Axial Flux Permanent Magnet Motor For Electromagnetic Active Suspension

Vehicle will be in the process of driving body vertical vibration caused by road roughness motivation,it will affect the ride comfort and safety of the passengers,the active suspension system can according to the operation of the vehicle speed and road surface excitation provides an active damping force to offset the impact of the pavement,thereby improveing vehicle ride comfort,in the process of operation stability and security,Active suspension systems require motors that provide active damping force to have the characteristics of high torque density,small torque ripple,and fast response speed.So this article is based on the electromagnetic suspension system and the structure characteristics of axial flux permanent magnet motor,designed a torque density,small torque ripple,the response speed of the double stator single rotor axial flux permanent magnet motor,through the stator misalignment technology further weaken the axial flux permanent magnet motor torque ripple,thereby improving the vehicle ride comfort and safety.First of all,the motor designed in this paper is applied to the active suspension system.Considering the given performance index parameters,a double-stator single-rotor axial flux permanent magnet motor with large torque density,small torque ripple and fast response speed is designed.The rationality of the electromagnetic design of the motor is verified by finite element simulation and experiment of electromagnetic field,and the high harmonic frequency and high harmonic torque frequency of the no-load phase voltage in the motor are obtained.Secondly,the stator dislocation technique is proposed to further reduce the torque ripple of the double-stator single-rotor axial flux-permanent magnet motor.It is verified by theory and simulation that stator dislocation can not only suppress the toothed torque of axially fluxed-permanent magnet motor,but also suppress the torque ripple caused by the high-order harmonics of no-load phase voltage of the motor.Finally,the optimal stator dislocation Angle is selected to weaken the torque ripple of the motor,and the stator dislocation has little effect on the response speed of the motor.Finally,the influence of motor torque ripple on the performance of active suspension was studied,and it was verified that the optimized axial flux permanent magnet motor was beneficial to improve the ride comfort,handling stability and safety of the vehicle.An active suspension system with linear quadratic Gaussian(LQG)optimal control was built.Torque pulsation before and after optimization of axial flux permanent magnet motor was added into the active suspension system respectively.Finally,it was concluded that the axial flux permanent magnet motor used to optimize the active suspension reached the damping characteristics of the active suspension.