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It is difficult to apply conventional online motor current signature analysis techniques for diagnosis of rotor faults for closed-loop induction motor drives for many applications due to the masking effect of the feedback current controller and/or variable frequency or load operation. Relying solely on traditional offline inspection techniques during regular maintenance does not allow frequent monitoring...
Broken rotor bar/ end-ring is a common fault in squirrel cage induction motors and has been thoroughly investigated in the case of AC grid supply. In this paper, this type of fault is studied in case of inverter driven motor. Induction motor is driven using scalar Volts/ Hz control method. Motor stator current and inverter input current spectra are studied for frequency components due to fault. Inverter...
The detection of faults in an induction motor is important as a part of preventive maintenance. Stator current is one of the most popular signals used for utility-supplied induction motor fault detection as a current sensor can be installed nonintrusively. In variable speeds operation, the use of an inverter to drive the induction motor introduces noise into the stator current so stator current based...
Rotor electrical faults are common types of faults in squirrel cage induction motors and have been investigated in detail in steady state condition for grid-connected induction motors. In this paper, this type of fault is studied in case of inverter driven motors. Inverter input and output currents are studied for the fault indicative frequency components. The harmonics which are induced to the inverter...
The paper analyzes the magnetic noise in inverted-fed single speed three-phase induction motors with squirrel cage rotor. The motors are totally enclosed and externally cooled. Investigation includes motors with the rated speeds of 3000, 1500, 1000 and 750 r/min. The investigated motors were placed in the semi-anechoic chamber in order to determine the noise-to-frequency characteristics (spectrograms)...
The objective of this paper is to propose a simple emulator of variable speed wind turbine generator, which consists of two inverters control two squirrel cage induction motors. One acts as prime mover and other acts as variable speed generator. As prime mover, the manual speed command is used to simulate as close as possible of wind turbine. As generator, the variable speed self excited induction...
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