What are the reasons for failure of three-phase induction motor?

Potential causes include excess vibration (e.g., radial misalignment, axial thrusting, highly variable duty-cycles); an excessive number of starts or reverses, or too-short of an interval between starts/reverses; long starting times; physical damage to the rotor; and excess heat (e.g., high ambient temperatures, over- …

What causes rotor failure?

Various stresses can cause rotor failures: thermal, magnetic, dynamic, environmental, mechanical, and residual. When installed and operated as designed, the stresses remain within tolerance and the motor operates properly for years.

What is the function of stator winding?

The main function of stator is to produce rotating magnetic field, while the main function of rotor is to generate (output) current by magnetic wire cutting in rotating magnetic field.

How does a bad rotor look like?

One of the most common indicators of worn out brake rotors is rattling, wobbling, or shaking while braking. These vibrations are normally felt through your foot as you apply the brakes, and it is usually indicative of brake rotors that have become warped.

Why does my stator keep burning out?

A bad diode in a rectifier will dump AC current into a system. The AC current heats up the stator and the heat destroys the insulation and ultimately carbonizes it turning it into a low resistance brick.

What causes insulation in a stator winding to fail?

This type of insulation failure is typically caused by contaminants, abrasion, vibration or voltage surge. This type of insulation failure is typically caused by contaminants, abrasion, vibration or voltage surge. Thermal deterioration of insulation in one phase of the stator winding can result from unequal voltage between phases.

When do low frequency stator flux analysis occur?

Low Frequency Stator Flux Analysis One of the first faults a winding will encounter is turn-to-turn shorts. These faults will migrate into phase-to-phase or phase-to-ground shorts. In the plots below, the labeled peaks occur at running speed sidebands about line frequency.

What causes the stator of an aero engine to fail?

Failed stator vanes of various aero-engines were subjected to investigations. Stator segment designated as SV-1 failed due to impact by large iron containing object generated possibly inside the turbine. Damage on the vanes of stator segment termed as SV-2 has taken place by stress rupture at low stress and high temperature.

When is the life of a stator winding shortened?

All rights are reserved. Reproduction of these photographs by print or electronic means is prohibited. The life of a three-phase stator winding can be shortened dramatically when the motor is exposed to unfavorable operating conditions — electrical, mechanical or environmental.