Motor Inductance Parameter Identification for Reconfigurable On-Board Chargers

This paper focuses on a novel integrated on-board charging systems, innovatively leveraging time-division multiplexing to reconfigure motor inductances as three-phase inductors in rectifier circuits, thereby establishing a novel integrated on-board charging system. This design not only significantly enhances spatial efficiency but also reduces costs through hardware reuse. To ensure the stability and robustness of the charging system under complex operating conditions, precise parameter identification of motor inductances emerges as a critical technical challenge. During prolonged system operation, parameter imbalance in motor inductances was observed, primarily attributed to non-uniform temperature distribution, material aging, and electromagnetic interference. Such imbalances may degrade system efficiency or even induce malfunctions. To address this, two circuit models were developed: an uncontrolled rectifier model and a controlled circuit model incorporating switching transistors. These models enable comparative analysis of how inductance parameters influence circuit characteristics, including voltage ripple, current harmonics, and power factor. Two measurement methodologies were proposed. The first employs high-precision sensors for direct data acquisition, achieving real-time accuracy through optimized sensor placement and signal processing algorithms. The second introduces a dedicated filtering circuit to suppress high-frequency noise, thereby enhancing measurement reliability. Corresponding mathematical models were formulated and validated via comprehensive simulations in MATLAB/Simulink.