METHOD OF ACOUSTIC DIAGNOSTICS OF INDUCTION MOTOR WINDING INSULATION Russian patent published in 2011 - IPC G01N29/11 

FIELD: electricity.

SUBSTANCE: sinusoidal electric oscillations are generated with the specified frequency, at the same time the frequency of sinusoidal electric oscillations is selected as equal to 5 kHz, electric oscillations are amplified, applied to the induction motor stator winding so that current of 1 ampere leaked through the induction motor stator winding, acoustic oscillations are received from the surface of the induction motor stator body, converted into electric oscillations, amplified, compared to generated sinusoidal electric oscillations, attenuation ratio is determined for received acoustic oscillations in insulation of the induction motor stator, the value of the attenuation coefficient is used to determine an elasticity module of the impregnation material of the induction motor stator insulation, using dependences of the elasticity module on the time of thermal ageing of insulation, the rated value of the elasticity module is determined, then the quotient of division of the rated value of the elasticity module by the value of the elasticity module is the normalised value of the elasticity module, which is used to determine the residual resource of the induction motor with account of the operation mode of the induction motor.

EFFECT: making it possible to forecast the residual time of operation of the induction motor at various stages of operation under different conditions of temperature, moisture and vibration.

2 cl, 3 dwg