Research on Passive Fault‐Tolerant Mechanism for Delta‐Connected 2 × 3‐Phase SPMSM Under Two‐Phase Open Circuit Fault Conditions

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The development of a natural fault‐tolerant algorithm significantly reduces the dependence of surface‐mounted permanent magnet synchronous motor (SPMSM) control systems on conventional fault‐detection methods. This advancement effectively mitigates misdiagnosis risks while enhancing overall system reliability. This paper presents a comprehensive investigation and analysis of passive fault‐tolerant mechanisms in delta‐connected 2 × 3‐phase SPMSM systems under two‐phase open circuit fault (OCF) conditions. Owing to its distinctive topological configuration, the proposed system exhibits inherent self‐regulating characteristics. Specifically, when a two‐phase OCF occurs in a delta‐connected 2 × 3‐phase SPMSM driven by a mono‐inverter, the healthy phases connected in parallel with the faulty ones automatically increase their current to maintain the required magnetomotive force for continuous motor operation. Finally, the feasibility and reliability of the proposed fault‐tolerant scheme are validated experimentally.