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This paper quantitatively compares two coaxial magnetic gears (CMGs) with parallel magnetic circuit and series magnetic circuit, which are artfully integrated into a permanent magnet (PM) brushless DC motor. By using the finite-element method, the performances of both CMGs are compared and evaluated. Analysis results show that the CMG series magnetic circuit can offer higher pull-out torque and back-EMF...
Fractional-slot permanent-magnet (FCSPM) machines offer several advantages, but they suffer from the high content of space harmonics in the air-gap magnetic motive force (MMF) distribution. The MMF space harmonic amplitude and frequency depend on the particular combination of numbers of slots and poles. Such harmonics induce losses in the rotor since they are not synchronous with the rotor speed....
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