Ingeniería e Investigación (May 2009)
Stator winding short-circuit fault detection in a permanent magnet synchronous motor (PMSM) using negative sequence current in time domain
Abstract
A negative sequence analysis in time domain was applied to fault detection of permanent magnet synchronous motors (PMSM). The fundamental components of the motor terminal currents were obtained using a Notch filter, based on which the negative se- quence components in time domain were then calculated; the negative sequence current constituted the stator winding short-cir- cuit fault indicator. The negative sequence current also provided a qualitative evaluation regarding the severity of the fault. The proposed method promptly (< 22 ms) and reliably determined the stator winding short for different levels of severity in faults around and greater than 6.25% of the shorted phase. Experimental studies confirmed the proportional relationship between fault indicator and the level of severity. Using negative sequence current in time domain reduced computational cost and detection ti- me compared to that in frequency domain. The proposed method could be extended to detect the shorted phase to improve mo- nitoring. The method was validated online using a PMSM experimental setup with dSPACE and Matlab/Simulink environment.
