| Under the general trend of energy conservation and emission reduction all over the world.Super-premium efficiency asynchronous motor(SEAM)meets the standards of energy conservation and emission reduction.Researches on the electromagnetic,temperature and thermal stress of SEAM is obviously important.Therefore,we propose to apply the Multiphysics coupling to the development process of the SEAM.The construction and analysis of the multi-physics coupling of the motor is a comprehensive research topic with high academic value and engineering significance.Firstly,we analysis the losses of SEAM accurately,and proposes a losses calculation model that considers multiple factors.The main reasons of the losses of the asynchronous motor and the calculation method are elaborated and analyzed.we propose that take the advantages of the finite element calculation method can comprehensively consider multiple factors,so that can meet the high precision requirements of field coupling.Secondly,we proposed an electromagnetic field-temperature field bidirectional iterative coupling method by analyzing the changes of the physical properties of the components of the motor affected by temperature which fits the calculation model of motor iron loss to the influence of temperature by measuring the loss coefficient of silicon steel sheet at different temperatures.Thirdly,the finite element analysis of the electromagnetic field characteristics for the YE4 SEAM respectively under no-load,rated load,1.5 times rated load and maximum torque conditions.The distribution of iron consumption in fixed rotor and the copper consumption in fixed rotor winding(squirrel cage)under different working conditions are calculated.And its loss distribution is used as a heat source into the temperature field model.By changing the material properties of each component and iterating repeatedly,the temperature rise distribution of the motor under different working conditions are obtained.Compared with the prototype test results,the calculation results are consistent with the test results.Finally,To get the motor temperature field-thermal stress field,a sequential coupling method is used which including analyzing the elastic mechanics of each component in the motor,obtaining the coupling results of the thermal stress distribution of the motor rotor bar under different working conditions,calculating structural point thermal stress,analyze the influencing factors of the thermal stress of the rotor bar of the motor..This study built a multi-physics coupling field for the SEAM,and provided technical support for future motor loss reduction,performance optimization,and fault pre-analysis. |
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