Vibration Analysis And Damping Of Switched Reluctance Motor

Switched reluctance motor(SRM)vibration has been a problem that has plagued its widespread application in recent years.This paper will analyze the source of vibration of reluctance motors in detail,and related damping methods are proposed.The main research work is as follows.(1)The establishment of magneto-mechanical coupling model for the switched reluctance motorThe vibration of SRM is mainly caused by electromagnetic force and magnetostrictive force.Previous studies neglected the effect of magnetostriction.To study the vibration characteristics of the SRM more comprehensively,The paper established a magneto-mechanical coupling model of the SRM which considered magnetostrictive effect.(2)Study on Vibration of SRM considering control modeThe control mode of switched reluctance motor has an important influence on its operation characteristics.In the past,there was no research on the influence of control mode on the vibration of switched reluctance motor.Therefore,the joint simulation of the torque sharing function control circuit and the direct torque control circuit with the established magneto-mechanical coupling model is carried out in this paper.It is concluded that the SRM has lower vibration when the torque sharing function is used to control the circuit.The experimental results show that the calculation of the switched reluctance motor’s vibration characteristics considering magnetostriction is in good agreement with the experimental results.The vibration characteristics of SRM with various torque sharing functions are analyzed theoretically.It is found that the vibration amplitude of switched reluctance motor controlled by linear torque sharing function is the smallest,and the vibration decreases gradually with the increase of commutation overlap angle within the allowable range.(3)The tangential vibration analysis of SRMAt present,the vibration research of SRM mainly focuses on the radial electromagnetic force,ignoring the influence of tangential electromagnetic force on the vibration caused by the increase of the torque.This paper explored the radial and tangential vibration characteristics of the SRM under different load conditions.The difference between the radial and tangential vibration was analyzed by finite element method.It is concluded that the component of tangential vibration increases with the increase of load.Moreover,the high frequency component of tangential vibration is much higher than that of radial vibration.Finally,the conclusion is verified by experiments.(4)A novel stator structure is proposed for vibration dampingThis paper presented a new type of motor stator structure,and optimized the corresponding parameters.The traditional SRM and improved SRM were manufactured.The vibration characteristics of the two SRMs are studied.The experimental results were shown that the SRM with the improved stator structure has better vibration reduction effect.