A Fast and Efficient Two-Step Open Phase Fault Diagnostic Method for Dual Three-Phase PMSMs Using Harmonic Components

This letter proposes a fast and efficient open phase fault (OPF) diagnostic method using the harmonic components for dual three-phase PMSMs. The diagnosis consists of fault detection and localization, in which the indicator based on 4<sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">th</sup> harmonic is derived to detect whether OPF happens, and the indicator based on 2<sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">nd</sup> harmonic is derived to locate the OPF. This two-step fault diagnostic method can locate the fault within 1/5 electrical cycle, which is fast and computation-efficient. Moreover, it does not depend on motor parameters and is robust to operating condition change. Compared with existing methods, the proposed method is applicable to both surface-mounted and interior motors with various control strategies. Experiments and comparisons are conducted to validate the performance of the proposed method.