Security code

The 7 reasons for electric motor failure

The most common reason for electric motor breakdown during normal operation is bearing failure, according to an IEEE (Institute of Electrical and Electronics Engineers) survey.

The study also found that a third of motor failures are related to the stator winding, while more than one in ten breakdowns occur for ‘unspecified’ reasons.

Here are the figures in full:

  • Bearings – 37%
  • Stator winding – 33%
  • Unspecified – 11%
  • Shaft/coupling – 6%
  • Rotor – 5%
  • External devices – 5%
  • Brushes/slip ring – 3%

The report also identified that most kinds of electric motor failure were observed with similar frequency during both normal operating condition and while maintenance and testing during shutdown. The major exception to this rule was stator winding failure, which accounted for only 8 per cent of breakdowns reported during maintenance – compared to 33 per cent for motors in operation.

This alarming statistic demonstrates that some inspection methods for stator winding insulation in electric motors may be inadequate. Identifying a winding fault while the motor is running will usually lead to the process being halted while a replacement can be installed or, in the case of specialist or customised motors, a rewind is performed.

Unscheduled downtime is a frustrating and expensive experience, with every minute your application is down costing more and more in lost production.

Should the worst happen, and your electric motor fails during operation, give Gibbons a call. We have a substantial stockholding of electric motors of all sizes, and our 24-hour emergency service means we’ll deliver and install a new motor to have you up and running in no time.

We also provide a dedicated motor rewinds and repairs service, offering free collection and delivery within 50 miles of our Tollesbury workshop.

For all electric motor sales and rewind enquiries, call Gibbons on 01621 868138 or email for immediate assistance.

Electric Motors

Add comment

Back to Blog