VP6-05 Inter-Turn Short-Circuit Fault Detection Method for DTPPMSM Based on Voltages Demodulation
Creators: Lijun Xiao
Chengsi Liu
Shaobin Li and Jibin Zou
Publisher: name: IEEE
Year: 2025

I. Introduction Dual three-phase permanent magnet synchronous motor (DTPPMSM) has been widely used in transportation fields such as electric vehicles, hybrid vehicles and more electric aircraft because of the advantages of high reliability, high efficiency and fault tolerant capability. The timely and online detection of inter-turn short-circuit (ITSC) fault is crucial for ensuring the healthy and stable operation of the motor, thus drawing increasingly attentions. II. Voltage Analysis Assuming that the ITSC fault occurs in phase a1, and the ITSC faulty part occupies a proportion of k of the entire phase, then the ITSC fault leads to a voltage remainder Ur in phase voltage equations. When transferring the phase voltage into d- and q-axis voltage, Ur leads to a 2nd voltage fluctuations. Then, the demodulation matrix is employed to transfer the 2nd d- and q-axis voltage fluctuations into DC component , and the low pass filter is employed to obtain the pure DC signal. The fault indicator Fi can be obtained from the sum of square of DC signals. The whole process of the fault indicator Fi establishment can be seen from Fig.1. And the fault indicator can be checked without extra sensors, and it can achieve online ITSC fault detection. III. Experimental validation. A 22-pole 24-slot DTPMSM prototype is manufactured to experimentally validate the proposed ITSC fault detection method. The k is given as 0.05 and 0.2 separately, and the corresponding results are shown in Fig.2. The k calculated from Fi are 0.0507 and 0.1962 correspondingly, which are similar to the given k of 0.05 and 0.2. So the proposed method can achieve accurate ITSC fault detection. IV Conclusion This paper proposed an inter-turn short-circuit (ITSC) fault detection method for dual three-phase permanent magnet synchronous motor (DTPPMSM) based on voltages demodulation. The paper investigated the influence of ITSC fault on voltage, based on the demodulation and filtering of voltage fluctuations caused by ITSC fault, realizing the online ITSC fault detection without extra sensors. The effectiveness and correctness of the proposed method are validated by prototype experiment.
I. Introduction Dual three-phase permanent magnet synchronous motor (DTPPMSM) has been widely used in transportation fields such as electric vehicles, hybrid vehicles and more electric aircraft because of the advantages of high reliability, high efficiency and fault tolerant capability. The timely and online detection of inter-turn short-circuit (ITSC) fault is crucial for ensuring the healthy and stable operation of the motor, thus drawing increasingly attentions. II. Voltage Analysis Assuming that the ITSC fault occurs in phase a1, and the ITSC faulty part occupies a proportion of k of the entire phase, then the ITSC fault leads to a voltage remainder Ur in phase voltage equations. When transferring the phase voltage into d- and q-axis voltage, Ur leads to a 2nd voltage fluctuations. Then, the demodulation matrix is employed to transfer the 2nd d- and q-axis voltage fluctuations into DC component , and the low pass filter is employed to obtain the pure DC signal. The fault indicator Fi can be obtained from the sum of square of DC signals. The whole process of the fault indicator Fi establishment can be seen from Fig.1. And the fault indicator can be checked without extra sensors, and it can achieve online ITSC fault detection. III. Experimental validation. A 22-pole 24-slot DTPMSM prototype is manufactured to experimentally validate the proposed ITSC fault detection method. The k is given as 0.05 and 0.2 separately, and the corresponding results are shown in Fig.2. The k calculated from Fi are 0.0507 and 0.1962 correspondingly, which are similar to the given k of 0.05 and 0.2. So the proposed method can achieve accurate ITSC fault detection. IV Conclusion This paper proposed an inter-turn short-circuit (ITSC) fault detection method for dual three-phase permanent magnet synchronous motor (DTPPMSM) based on voltages demodulation. The paper investigated the influence of ITSC fault on voltage, based on the demodulation and filtering of voltage fluctuations caused by ITSC fault, realizing the online ITSC fault detection without extra sensors. The effectiveness and correctness of the proposed method are validated by prototype experiment.