DSP Implementation of the Multiple Reference Frames Theory for the Diagnosis of Stator Faults in a DTC Induction Motor Drive

Abstract

Abstract-This paper deals with the use of a new diagnostic technique based on the multiple reference frames 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 digital-signal-processor (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.

Early detection of stator voltage imbalance in three-phase induction motors

“…The next step was online computation of the Parks vector transform and calculation of the Parks vector Modulus following Eq. (11). The mean of this modulus was subtracted from each sample to remove the DC bias.…”

“…The objective here is to make inferences on occurrence of the evolving slow-time-scale faults (e.g., gradual breakdown in winding insulation), based on changes in the observed statistics of the fast-time-scale process (e.g., stator voltage) dynamics. The problem of pattern recognition from time series data for machine health monitoring has been recently addressed by many researchers [10,11].…”

Implementation of a Fault-Diagnosis Algorithm for Induction Machines Based on Advanced Digital-Signal-Processing Techniques

“…Owing to recent digital-signal-processor (DSP) technology developments, motor-fault diagnosis can now be done in real-time fashion based on the stator line current [9]- [16], allowing precise and low-cost motor-fault detection. Beyond this, once simple and efficient fault-detection algorithms are employed, it is possible to control the motor and detect the fault at very early stages simultaneously using the same DSP [11], [16], and [18]. Typically, implementing a comprehensive fault-diagnosis algorithm taking all the details into account like the decision-making stage is a long and complicated procedure.…”

A new wavelet based diagnosis and protection of faults in induction motor drives

“…Some of the diagnostic techniques developed for line-connected induction motors are based on the measurement of the negative sequence components of the supply currents. However, it has been shown in [21] that the negative sequence component of supply current is strongly attenuated in the vector-controlled induction motor drives.…”

“…shows the comparisons of feature vector between faulted and normal conditions using equations (17) -(21). These feature vectors are used to train the WNN of the proposed faults diagnostic scheme.…”