Early Detection of Broken Rotor Bars in Inverter-Fed Induction Motors Using Speed Analysis of Startup Transients

The fault diagnosis of electrical machines during startup transients has received increasing attention regarding the possibility detecting faults early. Induction motors are no exception, and motor current signature analysis become one most popular techniques for determining condition various components. However, in case inverter powered systems, a is difficult to determine from stator because signatures could overlap with other produced by inverter, low-slip operation, load oscillations, non-stationary conditions. This paper presents speed methodology reliable broken rotor bar inverter-fed induction motors. proposed detection based on tracking time-frequency domain. As result, different severity levels oscillations can be identified. promising results show that this technique good complement classic reveals high potential overcome some its drawbacks.