Research On The Influence Of Auxiliary Slot On Vibration Performance And Noise Of SRM

Switched reluctance motors have the advantages of high speed,high reliability,and high cost performance in design,so they are used in automobiles.However,due to its own structural characteristics,if it is not properly controlled,it will cause serious vibration and noise problems.Therefore,this paper proposes a stator and rotor structure with double auxiliary slots,which changes the electromagnetic field distribution inside the motor to achieve the purpose of changing the magnitude of the radial electromagnetic force,thereby reducing the vibration and noise of the switched reluctance motor.The form of the double auxiliary slot will change the structure of the stator and rotor of the motor,weaken its rigidity and strength,and affect the output torque.Therefore,it is necessary to study and analyze the model after the introduction of the auxiliary slot.This paper focuses on the influence of auxiliary slots on the electromagnetic and vibration characteristics of switched reluctance motors,which can be summarized into the following aspects:First,the influence of the opening position of the auxiliary slot on the electromagnetic field and radial force inside the motor is studied.By establishing four finite element models of motors with different stator and rotor structures and conducting simulation experiments,the electromagnetic field distribution and radial electromagnetic force of the traditional SRM(without auxiliary slot),stator auxiliary slot SRM,rotor auxiliary slot SRM,and dual auxiliary slot SRM are obtained.The law of change.On the basis of simulation analysis,an auxiliary slot structure of switched reluctance motor which is beneficial to vibration and noise reduction is proposed.Secondly,the influence of the structural parameters of the auxiliary slot on the internal electromagnetic field and radial force of the motor is studied.The three factors of stator auxiliary slot width D,rotor auxiliary slot width W and rotor auxiliary slot depth H are used as experimental factors,and then the single factor variable method is used to study the influence of each factor on radial force,radial magnetic density and radial force fluctuation rate The law of influence.Taking into account that various factors may have mutual influence,on the basis of single factor analysis,an orthogonal experimental scheme was further established,focusing on the influence of the auxiliary slot structure parameters under different parameter combinations on the radial electromagnetic force and the radial force fluctuation rate The SRM model with the optimal structural parameters of the auxiliary slot is obtained.Again,the modal analysis is carried out for the stator of the optimal SRM model obtained above.Taking into account the complexity of the motor structure,it is necessary to simplify the process and perform modal analysis during the modeling process,so as to extract the modal shape diagram at the stator natural frequency for subsequent analysis.Through the coupling of the magnetic field and the structure field,the radial force in the air gap magnetic field can be effectively loaded on the stator structure,which provides excitation conditions for the harmonic response analysis,so as to obtain the vibration deformation,vibration speed and vibration acceleration of the motor.Used to analyze the vibration of the motor.Finally,the noise of the optimal SRM model is analyzed.By establishing the sphere noise analysis domain and solving it,the sound pressure and its variation with frequency are obtained.Finally,by comparing the sound pressure levels before and after SRM optimization,it is found that the sound pressure level decreases by 6.9% after optimization.