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Magnetic gears are a new and rapidly emerging technology. Compared to mechanical gears, they enjoy the advantage of having inherent overload capability. However, their torsional stiffness is much lower than mechanical gears, resulting in oscillations during transient changes in speed and load. Damper windings have been used in synchronous generators to suppress oscillations due to transients, and they are applied to the magnetic gear for the same purpose. It is believed that this is the first attempt to add a passive means of oscillation damping to the magnetic gear, whereas all other previous means have been active.
Date of Publication: Sept. 2011