Abstract：The common fault-tolerant control strategy for multiphase machines needs to set up the reduced order system model. There are two different neutral connections for dual three-phase permanent magnet synchronous motor (PMSM) under open phase conditions, and each case corresponds to a different decoupled transformation matrix, so they need to be modeled, respectively. When an open-phase fault occurs for dual three-phase machine, the voltage, flux, and torque equations are unaffected by the fault. The fault-tolerant control strategy based on normal decoupling transformation is constructed in this paper. This control strategy is suitable for the two different neutral connections, and only modifications of current references in the harmonic subspace are needed. Two optimal current control modes of minimum stator loss and maximum torque output are analyzed. The influence of three harmonic magnetic potential on the electromagnetic torque is analyzed. Theoretical analysis and experimental verification were done for one open phase and two orthogonal open phases. The experimental results demonstrate the effectiveness and feasibility of the proposed strategy.
周长攀, 杨贵杰, 苏健勇, 孙国栋. 基于正常解耦变换的双三相永磁同步电机缺相容错控制策略[J]. 电工技术学报, 2017, 32(3): 86-96.
Zhou Changpan, Yang Guijie, Su Jianyong, Sun Guodong. The Control Strategy for Dual Three-phase PMSM Based on Normal Decoupling Transformation under Fault Condition Due to Open Phases. Transactions of China Electrotechnical Society, 2017, 32(3): 86-96.
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2017, Vol. 32 
