Fast train

Case study- Traction Motor Fatigue failure project

The gear-case mounting points on an axle mounted locomotive traction motor had suffered severe fatigue damage in service.

A test specification was written proposing a method of determining the cause of failure.

The motor and gear-case were fitted with strain and acceleration instrumentation.
Motor lug
The test train covered its normal service route of over 500 km; 40 data channels of strain, acceleration, displacement and speed were recorded.

The data was analysed and a design modification proposed via a full report and presentation. A sample of motors were reworked incorporating the modifications proposed in the report.

Instrumentation was fitted and a repeated track test carried out. A fatigue analysis of the test data predicted a much improved life in excess of the required 25 years.

Linear voltage displacement transducersSpeed sensorMotor modificationTraction motor