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This paper focuses on a permanent magnet (PM) machine based electric variable transmission (PM-EVT) for HEV applications. The basic idea of EVT is firstly given as well as a state-of-the-art. To choose an appropriate PM-EVT structure, a detailed description of possible architectures is presented and the specifications are defined based on the well-known Toyota Prius hybrid car. Main design procedure and equations are presented. The first design is finished, some preliminary results are given.