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Motor Failure Data

A few of our bigger locations and the Institute of Electrical and Electronic Engineers (IEEE) had been collecting data for many years. We captured this data and collated them (see Tables 39.1 and 39.2). We found large differences between our numbers and those from IEEE. We can account for these in part

Motor Maintenance Regimes 297

by the difference in the ways of collecting data and in definitions. We believe that IEEE figures give a pessimistic view of overall failure rates that one might expect from a professionally-managed site.

Location

Offshore

Onshore

Data source

IEEE

Author

IEEE

Author

Voltage

HV

HV

LV

HV

LV

HV

LV

Failures per motor-year

0.1

0.1

0.07

0.07

0.08

0.07

0.05

Table 39.1 Motor Failure Rate in Failures per Motor per Year

Location

Offshore

Onshore

Data Source

IEEE

Author

IEEE

Author

Component

Bearings

40

30

50

50

Stator

12

23

23

23

Rotor

12

7

8

4

Others

36

40

19

23

Table 39.2 Percentage of Failures per Failed Component

The information shows that motors are generally very reliable. There are few electrical failures and most failures are bearing related. The most significant underlying causes of failure are:

  • • Defective components
  • • Poor installation/maintenance
  • • Poor lubrication
  • • Water ingress
 
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