In this paper, a performance comparison between the novel axial flux magnetically geared machines (AFMG) and the conventional axial flux YASA machine is presented. The AFMG and YASA machines have the same stator construction in which segments are equipped with concentrated windings to form the stator. However, the AFMG machine has two rotors with different pole-pair numbers. Magnetic gear effect can be obtained to increase the torque density. The performance comparisons at no-load and on-load conditions are then studied by 3D-finite element analysis (FEM). Moreover, both machines are prototyped, tested and compared.
This paper proposes an axial flux magnetically geared (AFMG) permanent magnet (PM) machine for power split application in hybrid electric vehicles (HEVs). The proposed AFMG machine has the merits of simple structure and improved torque density by combining a magnetic gear (MG) with a PM machine. The machine can realize power split with the help of dual mechanical ports and one electrical port, i.e., the input mechanical power and/or electrical power produced by the machine can be split or integrated. The operation principle and two feasible stator slot/rotor pole combinations are analyzed. Moreover, the influence of the machine parameters on the output torque as well as the performance of both combinations are investigated and compared by using JMAG three dimensional (3D) finite element analysis (FEA). In addition, the method of boosting the machine torque is described and experiment results of the proposed machine prototype are provided and compared with FEA results.
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