Adaptive Diagnosis Method for Single-Switch Open-Circuit Faults in Full-Bridge Converters of 24/16-Pole Doubly Salient Electro-magnetic Motors
Year: 2026
Type: conference-paper
Abstract: Most existing open-circuit fault diagnosis methods are developed for 12/8-pole Doubly Salient Electro-magnetic Motors (DSEM). However, these methods cannot be directly used for 24/16-pole high-pole-number prototypes. They will cause commutation misjudgment under high commutation frequency, increase diagnosis delay, and show poor robustness when operating conditions change. To address these limitations, this paper presents a speed-load adaptive dual-threshold fault diagnosis method tailored for 24/16-pole DSEM. This method accurately distinguishes two types of open-circuit faults, namely drive signal loss and complete power device damage, by utilizing the essential difference in the presence or absence of back EMF current under the two faults. It solves the inherent defects of fixed thresholds by dynamically adjusting the diagnosis thresholds, and optimizes the commutation shielding interval under high commutation frequency. Simulation results show that the proposed method can complete fault detection, location and type distinction within 2 ms, achieve zero misjudgment and zero missed judgment in the full speed range of $\mathbf{2 0 0} \boldsymbol{\sim} \mathbf{2 0 0 0} \boldsymbol{r} \boldsymbol{/} \mathbf{m i n}$ and full load range of 20% $\sim$ 150%, and significantly improve the operational reliability of high-pole-number DSEM drive systems.
Authors: Lei Xiong, Hengfei Yu, Hengguo Zhang, Haizhen Xu
Institution: Hefei University
Language: English
Subfield: Electrical and Electronic Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: hybrid
OpenAlex ID: W7202175647