Electromagnetic vibration disturbing forces in different variants of the rotor displacement from an axis of the stator bore is carried out. Investigation for ТG type ТGV-200-2 by finite element method in COMSOL Multiphysics is carried out. The field mathematical model of static and dynamic eccentricity is described. The amplitude vibration disturbing forces are greatest, when a static eccentricity direction coincides with an axis of the stator winding phase is shown. The diagnostic features static and dynamic eccentricities are formulated. The most value of forces in the point with minimal air gap is shown. The diagnostic features static and dynamic eccentricities and the method of diagnostic eccentricity are formulated. Diagnostic feature of static eccentricity is to change the amplitude Maxwell stress tensor is established. The dynamic eccentricity diagnostic features are appearance in the spectrum of vibration disturbing forces rotating and multiple harmonics. References 8, tables 3, figures 6,
The article examines the characteristics of induction motors (IM) diagnostic method based on an analysis of change of the electromagnetic torque, which is required to start the movement of the rotor. The value of starting torque varies due to the appearance of damage of the motors. The proposed method while ensuring sufficient reliability to diagnose any engine required simple measuring devices and does not require special training. You need to conduct a comparative analysis of the values of the supply voltage at which the movement begins rotor, 1 / 3
N3 s8respectively, for damaged and undamaged IM. Two major cases of defects -short-circuit the stator winding and destruction of cage bars of the rotor. It is shown that in these cases the change starting torque (voltage) occurs in different ways: in short circuit stator starting torque is reduced (increases of the voltage), and at break rotor bars -on the contrary. Mathematical models of IM (capacity 1.7 ... 200 kW) proved high diagnostic sensitivity of method, ensuring its widespread adoption. References 8, figures 6.Key words: diagnostics of asynchronous motors, the start time of the electromagnetic, mathematical model, damage the stator and rotor windings.
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