Inter-turn Fault Identification of Surface-Mounted Permanent Magnet Synchronous Motor Based on Inverter Harmonics

Abstract

Inter-turn short-circuit faults can lead to further faults in motors. This makes monitoring and identifying such faults particularly important. However, because of interference in their working environment, fault signals can be weak and difficult to detect in permanent magnet synchronous motors. This paper proposes a method for overcoming this by extracting the inverter harmonics as an excitation source and then extracting characteristic of fault measurements from the negative sequence voltage. First of all, a model of permanent magnet synchronous motor faults is established and a fault negative sequence voltage is introduced to calculate the fault indicators. Then the high frequency harmonic excitation in the voltage is extracted. This is injected into the original voltage signal and the high frequency negative sequence component is separated and detected by a second-order generalized integrator. Simulation results show that the proposed method can effectively identify inter-turn short-circuit faults in permanent magnet synchronous motors while remaining highly resistant to interference. The method is especially effective when the severity of the fault is relatively small and the torque is relatively large.

Fault Diagnosis and Fault-Tolerant Control of PMSM Drives–State of the Art and Future Challenges

“…Analytical models of PMSM are most commonly used to model ITSC [42], [44], [47], [64], [72], [83], [193]- [198]. The models presented in the literature are described by differential equations, in a three-phase system A-B-C [42], [47], [83], [195], [196], [198], in a synchronous reference frame d-q for 3-phase motors [44], [72], [193], [194], [197], and also for multi-phase motors [213]. Models have been used in PMSM diagnostics to search for symptoms of ITSC faults [42], [44], [47], to produce estimators showing the number of shorted turns [88], to design methods affecting the control system by injecting additional signal [64], as well as to determine the residuals in comparison methods [194], where, based on the currents signals in synchronous reference frame compared to the values obtained from the observer.…”

“…Models have been used in PMSM diagnostics to search for symptoms of ITSC faults [42], [44], [47], to produce estimators showing the number of shorted turns [88], to design methods affecting the control system by injecting additional signal [64], as well as to determine the residuals in comparison methods [194], where, based on the currents signals in synchronous reference frame compared to the values obtained from the observer. However, the most popular use of the model is to test methods based on signal processing, such as ZSVC [195], PCA [83], DWT [72], Negative Sequence Voltage Component [193], [197], [198], Positive Sequence Voltage Component [193], [198].…”

Application of Machine Learning for Inter Turn Fault Detection in Pumping System

“…Breakdown of entire system not only causes system damage but also creates huge energy loss and, unplanned sudden downtime causes and huge maintenance cost. It is reported that 30% to 40% failure is seen in induction motor for stator inter turn fault [3]. This is actually electrical fault and this electrical fault is very sensitive which causes severe damage.…”

Archives of Electrical Engineering

“…The other solution is to create mathematical models of the faulty motor. The examples of using the mathematical model are mostly focused on circuit models [5][6][7][8][9][10][11][12][13][14][15][16] and field-circuit models [17,[19][20][21][22][23]. Circuit models based on the equivalent motor circuit based on Kirchhoff's equations are most often presented in the ABC phase system [5][6][7][8][9].…”

“…The examples of using the mathematical model are mostly focused on circuit models [5][6][7][8][9][10][11][12][13][14][15][16] and field-circuit models [17,[19][20][21][22][23]. Circuit models based on the equivalent motor circuit based on Kirchhoff's equations are most often presented in the ABC phase system [5][6][7][8][9]. Moreover, the analysis of the literature allows one to observe that the damage model of the PMSM can be presented also in the stationary reference frame 𝛼-𝛽 [8,9] and synchronous rotating frame 𝑑-𝑞 [7][8][9][10][11][12][13].…”