Due to the high torque density and sharing similar operating principles with vernier machines, the magnetic-geared permanent magnet machines have been gaining more attention recently. This paper focuses on power transferring feature of a magnetic geared machine among the stator, modulation layer and rotor by analytical methods. Analytical equations of the back electromotive force, torque and power are derived. It is found that the power expression is a function of gear ratio between modulation layer and rotor. In addition, the influence of the parameters on the back EMF and torque are also discussed. Finally, the analytical results are verified by the finite-element analysis (FEA), and the good agreements have been achieved.
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