At present,the influence of temperature is rarely considered in the study of flywheel rotor dynamics.In order to more accurately simulate the dynamic characteristics of the energy storage flywheel system during operation and ensure the safe and stable operation of the system,this paper takes the energy storage flywheel-motor rotor system as the object to study the variation of the critical eccentricity of the motor under the influence of temperature.Firstly,based on the Timoshenko beam theory,a dynamic model of the energy storage flywheel-motor rotor system considering the unbalanced magnetic pull force is established.Secondly,considering the influence of temperature on the Young's modulus of the motor rotor material,the stiffness matrix of the motor rotor unit under the influence of temperature is derived.Thirdly,Workbench is used to simulate the temperature field of the motor during operation,and the thermal deformation of the motor rotor is calculated.Finally,the influence of temperature on the maximum eccentricity of the motor during friction is comprehensively analyzed.The results show that:when the eccentricity rate of the motor reaches 75％at room temperature,friction failure will occur;the eccentricity of the friction fault decreases with the increase of the motor temperature;and when the motor operating temperature rises to 220 ℃,the eccentricity threshold will be reduced to below 25％.It is recommended that the maximum temperature of the motor should not exceed 150 ℃to prevent the motor from burning out.
rotorunbalanced magnetic pulltemperaturethermal deformationrubeccentricity
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