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Smart Structures and Systems
  Volume 29, Number 6, June 2022 , pages 785-790

Fault detection and classification of permanent magnet synchronous machine using signal injection
Inhwan Kim, Younghun Lee, Jaewook Oh and Namsu Kim

    Condition monitoring of permanent magnet synchronous motors (PMSMs) and detecting faults such as eccentricity and demagnetization are essential for ensuring system reliability. Motor current signal analysis is the most commonly used precursor for detecting faults in the PMSM drive system. However, the current signature responds sensitively to the load and temperature of the motor, thereby making it difficult to monitor faults in real- applications. Therefore, in this study, a condition monitoring methodology that detects motor faults, including their classification with standstill conditions, is proposed. The objective is to detect and classify faults of PMSMs by using programmable inverter without additional sensors and systems for detection. Both DC and AC were applied through the d-axis of a three-phase motor, and the change in incremental inductance was investigated to detect and classify faults. Simulation with finite element analysis and experiments were performed on PMSMs in healthy conditions as well as with eccentricity and demagnetization faults. Based on the results obtained from experiments, the proposed method was confirmed to detect and classify types of faults, including their severity.
Key Words
    fault detect; fault diagnosis; health management; inverter; magnetic saturation; permanent magnet synchronous motor; signal injection
Inhwan Kim, Younghun Lee, Jaewook Oh and Namsu Kim: Department of Mechanical engineering, Konkuk University, Seoul, Republic of Korea, 120 Neungdong-ro, Gwangjin-gu, Seoul, Republic of Korea

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