Online Voltage Sensorless High-Resistance Connection Diagnosis in Induction Motor Drives

P. M. DE LA BARRERA; G. R. BOSSIO; R. LEIDHOLD

IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC

Lugar: New York; Año: 2015 vol. 62 p. 4374 - 4384

0278-0046

A new method for online high-resistance connection (HRC) diagnosis in induction motor (IM) drives ispresented in this effort. This voltage sensorless method is based on a signal injection strategy applied to the IM during its normal operation. The signal is injected in the d-axis in such a way that it provides the phase currents with a dc component while avoiding torque perturbation. By measuring phase currents, it is possible to detect and isolate HRC problems. Experimental results showing high sensitivity to HRCs and immunity to symmetrical stator resistance variations have been obtained in a laboratory setup. The low perturbation produced by the injection method over the IM variables has also been experimentally demonstrated.