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The torque density characteristics for an axial flux magnetic gear using a flux-focusing topology is experimentally studied when using neodymium iron boron (NdFeB) rare-earth magnets. A geometric parameter sweep analysis was utilised in order to maximise both the calculated volumetric and mass torque density. The calculated torque and torque density was 628.6 N•m and 173.02 N•m/L while the experimentally measured torque and resultant torque density was 553.2 N•m and 152.3 N•m/L. Fig. 2 Axial flux density, B z , near the fixed rotor 3 due to magnets only on the high-speed rotor (rotor 1) with and without the n 2 = 25 LSR slots

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