13 common causes of motor failure

13 common causes of motor failure.
Power quality
1 - Transient voltage
Impact: Motor winding insulation breakdown leads to early motor failure and unplanned downtime
2 - Voltage imbalance
Impact: Imbalance creates excessive current flow in one or more phases that then increases operating temperatures-leading to insulation breakdown
3 - Harmonic distortion
Impact: Decrease in motor efficiency results in added cost and an increase in operating temperatures
Variable frequency drives
4 - Reflections on drive output PWM signals
Impact: Motor winding insulation breakdown leads to unplanned downtime
5 - Sigma current
Impact: Mysterious circuit trip due to protective earth current flow
6 - Operational overloads
Impact: Premature wear on motor electrical and mechanical components leading to permanent failure
Mechanical
7 - Misalignment
Impact: Premature wear in mechanical drive components that leads to premature failures
8 - Shaft imbalance
Impact: Premature wear in mechanical drive components that leads to premature failures
9 - Shaft looseness
Impact: Premature wear in mechanical drive components that leads to premature failures
10 - Bearing wear
Impact: Accelerated wear on rotating components resulting in bearing failure
Improper installation factors
11 - Soft foot
Impact: Misalignment of mechanical drive components
12 - Pipe strain
Impact: Shaft misalignment and subsequent stresses on rotating components, leading the premature failures
13 - Shaft voltage
Impact: Arcing across bearing surfaces create pitting and fluting resulting in excessive vibration and eventual bearing failure

[@bobcocampo]

How can ground fault monitoring predict possible failure of motors?

[@ElecEngineer]

You can use a carbon brush probe attachment, to measure.

[@bobcocampo]

@@ElecEngineer
Any technical research on ground fault monitoring meter and correlation with motor failure?

[@bobcocampo]

How is voltage affecting the efficiency of motors?

[@ElecEngineer]

Transient voltage, under voltage or overvoltage?

[@bobcocampo]

@@ElecEngineer
Both. Utility may use under voltage to increase electricity bill

[@ElecEngineer]

​@@bobcocampothe bill is paid for the kw not the voltage neither the ampere, so the bill won't be affected by reducing the voltage, the under voltage has effects on the electrical equipment & cables but not the bill.

[@bobcocampo]

@@ElecEngineer
Voltage has an effect on efficiency