A new type of brushless double rotor machine (BDRM) is proposed in this\r\npaper. The BDRM is an important component in compound-structure permanent-magnet\r\nsynchronous machine (CS-PMSM) systems, which are promising for power-split hybrid\r\nelectric vehicle (HEV) applications. The BDRM can realize the speed adjustment between\r\nclaw-pole rotor and permanent-magnet rotor without brushes and slip rings. The structural\r\ncharacteristics of the BDRM are described and its magnetic circuit model is built.\r\nReactance parameters of the BDRM are deduced by an analytical method. It is found that\r\nthe size characteristics of the BDRM are different from those of conventional machines.\r\nThe new sizing and torque equations are analyzed and the theoretical results are used in the\r\noptimization process. Studies of the analytical magnetic circuit and finite element method\r\n(FEM) model show that the BDRM tends to have high leakage flux and low power factor,\r\nand then the method to obtain high power factor is discussed. Furthermore, a practical\r\nmethodology of the BDRM design is developed, which includes an analytical tool, 2D field\r\ncalculation and performance evaluation by 3D field calculation. Finally, different\r\ntopologies of the BDRM are compared and an optimum prototype is designed.
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