ABSTRACT
Motor faults will modulate the air-gap flux distribution, which causes a forward and backward rotating magnetic field and, as a result, sideband harmonic frequencies appear around the fundamental component. An induction motor's defects can be diagnosed via its terminal quantities, such as voltage, current, and power, that are measurable outside the motor to give an indication of its condition. The motor current signature analysis (MCSA) method is utilized for diagnosis of the motor and inverter defects using information from the motor stator current. Due to its noninvasive feature, MCSA has received the attention of many researchers. Although MCSA has the capability to diagnose the gear defects and bearings localized defects, only a very small change in amplitude occurs at characteristic defect frequencies under no-load conditions. Stator current has been shown to be the suitable noninvasive method to diagnose gear faults.
