Publisher's Synopsis
This report reviews methods of condition monitoring for inverter-fed machines. Due to the cost, condition monitoring is not always possible. However, in an inverter drive system, because of the value of the drive and because the inverter is able to carry out the first level of surveillance, monitoring becomes a practical possibility.;This work reviews existing motor monitoring techniques, their application to inverter-fed motors and the extra precautions that this requires. The present state of technology for fixed-speed machines is also described, and both on-line monitoring and off-line diagnostic tests are covered as well.;The report then investigates the inverter itself as a source of condition monitoring information. It explains what is available as standard, and then shows how existing techniques applied to the control of high-performance drives could also be used to verify the health of more general-purpose systems.;A checklist is provided of simple one-off tests that can give a starting point for any motor health investigation, covering both variable and fixed-speed machines. Data processing and interpretation is covered, including analysis methods and software tools. Finally, the report identifies areas of active research which should lead to a wider uptake of monitoring systems. Conclusions are drawn and a list of over 50 references is provided.
