Research on thermal mechanical stress distribution of motor insulation structure
To explore the thermal mechanical stress distribution of motor insulation structure at high temperatures,we take the insulation structure of organic silicone system as the research object,test its thermal expansion coefficient and elastic modulus at different temperatures,and analyze the influence of thermal stress parameters at different temperatures on the thermal mechanical stress of organic silicone insulation system.The results show that within-50-200℃,the thermal expansion coefficient of insulation structure show a change trend of increases,decreases,and increases again with the increase of temperature,and its value is 0.8×10-5-1.7×10-5 K-1.The elastic modulus increases at first and then decrease with the increase of temperature,and its value is 0.2×103-3×103 MPa.The thermal mechanical stress borne by insulation structures increases linearly with the increase of thermal expansion coefficient and elastic modulus.The thermal mechanical stress of insulation structures firstly increases and then decreases with the increase of temperature,depending on the size of thermal expansion coefficient and elastic modulus at different temperatures.The feasibility of testing parameters and simulation analysis was verified through stress testing of the wire rod and motor,and the deviation between simulation value and testing value is within 15%.The simulation analysis results show that at 120℃,the maximum thermal mechanical stress point of motor insulation is located at the slot insulation,and the maximum stress value is 11.37 MPa.After sealing,the maximum thermal stress value of the slot insulation can be reduced by about 45%.
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