This paper presents a domain decomposition method (DDM) for time-stepped nonlinear finite element analysis (FEA) and its applications in electrical machines. This method, different from the classical Schwarz method, has no overlapping region between two sub-domains and, thus, does not require an iteration process to reach the accurate solution for linear problems. Due to the absence of the overlapping region, each sub-domain can belong to different physical domains, as an example, one being circuit sub-domain while others being FEA sub-domains. This feature not only makes it possible to support parallel computing, but also simplifies the formulation and implementation. Since the proposed DDM itself does not involve iteration, this method has no side effects on Newton-Raphson iteration in the case of nonlinear problems. The proposed DDM has been applied to transient FEA-circuit coupled problems and motion problems with the stationary and the rotating parts as separate sub-domains.
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