Fault operations of inverter-fed induction motor

This paper presents an investigation of the fault mode operations of a largely diffused class of electric drives, the inverter-fed induction motor drives. The attention is focused on some usual non catastrophic faults, i.e. those faults that don't cause the current and voltage exceed the safe limit. The investigation is carried out by monitoring only the input/output variables of each sub-system that composes the drive. The behaviour of typical faults such as the open phase at motor terminal, the base drive loosening of an inverter switch and the fault of the filter capacitance are presented and discussed. Simulations and spectrum analyses followed by experimental validations are shown.