Current Sensor Fault Diagnosis Based on a Sliding Mode Observer for PMSM Driven Systems.
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Then a sliding mode current observer is constructed in αβ coordinates to generate the fault residuals of the phase current sensors.The RT-LAB real-time simulation is used to build a simulation model of the hardware in the loop.The simulation and experimental results demonstrate the feasibility and effectiveness of the proposed method.
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Affiliation: School of Traffic and Transportation Engineering, Central South University, Changsha 410075, China. gangder@csu.edu.cn.
ABSTRACT
This paper proposes a current sensor fault detection method based on a sliding mode observer for the torque closed-loop control system of interior permanent magnet synchronous motors. First, a sliding mode observer based on the extended flux linkage is built to simplify the motor model, which effectively eliminates the phenomenon of salient poles and the dependence on the direct axis inductance parameter, and can also be used for real-time calculation of feedback torque. Then a sliding mode current observer is constructed in αβ coordinates to generate the fault residuals of the phase current sensors. The method can accurately identify abrupt gain faults and slow-variation offset faults in real time in faulty sensors, and the generated residuals of the designed fault detection system are not affected by the unknown input, the structure of the observer, and the theoretical derivation and the stability proof process are concise and simple. The RT-LAB real-time simulation is used to build a simulation model of the hardware in the loop. The simulation and experimental results demonstrate the feasibility and effectiveness of the proposed method. No MeSH data available. Related in: MedlinePlus |
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Mentions: To evaluate the robustness of the designed SMO, the stator resistance is changed from 0.02 Ω to 0.04 Ω at t = 0.2 s, and the torque is changed from 500 Nm to 1000 Nm at 0.3 s. The observation of extended flux linkage is shown in Figure 2. It is insensitive to the variation of stator resistance and torque. The torque calculation value which is obtained by the extend flux linkage is shown in Figure 3. The phase currents are shown in Figure 4, the actual value and the observation of the stator α and β axis currents are shown in Figure 5 and Figure 6, the amplitude of the current is correspondingly larger due to the increase of the torque at t = 0.2 s, the phase current and the stator αβ axis currents are insensitive to the stator resistance variation, and the system has good robustness, the observation of stator αβ axis currents can rapidly track the actual value with high precision. The current residuals in phase ‘a’ and in phase ‘b’ are respectively shown in Figure 7 and Figure 8. Furthermore, in order to illustrate the function of sliding mode observer, we introduce signal v at t = 0.1 s. |
View Article: PubMed Central - PubMed
Affiliation: School of Traffic and Transportation Engineering, Central South University, Changsha 410075, China. gangder@csu.edu.cn.
No MeSH data available.