DSP implementation of the multiple reference frames theory for the diagnosis of stator faults in a DTC induction motor drive

This paper deals with the use of a new diagnostic technique, based on the multiple reference frame theory, for the diagnosis of stator winding faults in a direct torque controlled (DTC) induction motor drive. The theoretical aspects underlying the use of this diagnostic technique are presented but a major emphasis is given to the integration of the diagnostic system into the DSP board containing the control algorithm. Taking advantage of the sensors already built-in the drive for control purposes, it is possible to implement this diagnostic system at no additional cost, thus giving a surplus value to the drive itself. Experimental results show the effectiveness of the proposed technique to diagnose stator faults and demonstrate the possibility of its integration in the DSP board.