Simplified method of taking into account temperature fluctuations influence on durability of induction motors stator winding insulation

The problem of taking into account of the influence of the induction motor stator winding temperature fluctuations on the rate of winding insulation aging is discussed. Investigations were carried out on the basis of clustering of the general industry TEFC motors with following creation generalized 5-node thermodynamic models of TEFC motors for each cluster. Random loading mode of electric drive with uniform distribution law was simulated. Values of the coefficient of thermal resource of insulation expenditure were received with employment of generalized thermodynamic models. On the basis of these results expressions for approximate taking into account influence of the temperature fluctuations on acceleration of the insulation thermal resource expenditure were received. Simple method of accounting of this influence on the stage of selection and checking of induction motors for electric drives, working with random loading was proposed.